Add dicore3-command

76 files changed, 6677 insertions, 0 deletions

diff --git a/dicore3/command/build.gradle.kts b/dicore3/command/build.gradle.kts
new file mode 100644
index 0000000..6077c91
--- /dev/null
+++ b/dicore3/command/build.gradle.kts
@@ -0,0 +1,4 @@
+
+group = "io.dico.dicore3"
+//name = "dicore3-command"
+version = "1.2.5-mc-1.13"
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/ChildCommandAddress.java b/dicore3/command/src/main/java/io/dico/dicore/command/ChildCommandAddress.java
new file mode 100644
index 0000000..7593492
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/ChildCommandAddress.java
@@ -0,0 +1,96 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.command.predef.HelpCommand;
+
+import java.util.*;
+
+public class ChildCommandAddress extends ModifiableCommandAddress {
+    ModifiableCommandAddress parent;
+    final List<String> namesModifiable = new ArrayList<>(4);
+    List<String> names = namesModifiable;
+    Command command;
+
+    public ChildCommandAddress() {
+    }
+
+    public ChildCommandAddress(Command command) {
+        this.command = command;
+    }
+
+    public ChildCommandAddress(Command command, String name, String... aliases) {
+        this(command);
+        addNameAndAliases(name, aliases);
+    }
+
+    public static ChildCommandAddress newPlaceHolderCommand(String name, String... aliases) {
+        ChildCommandAddress rv = new ChildCommandAddress(null, name, aliases);
+        HelpCommand.registerAsChild(rv);
+        return rv;
+    }
+
+    @Override
+    public boolean isRoot() {
+        return false;
+    }
+
+    @Override
+    public ModifiableCommandAddress getParent() {
+        return parent;
+    }
+
+    @Override
+    public Command getCommand() {
+        return command;
+    }
+
+    @Override
+    public void setCommand(Command command) {
+        if (hasUserDeclaredCommand()) {
+            throw new IllegalStateException("Command is already set at address \"" + getAddress() + "\"");
+        }
+        this.command = command;
+    }
+
+    @Override
+    public List<String> getNames() {
+        return names;
+    }
+
+    public void addNameAndAliases(String name, String... aliases) {
+        names.add(name);
+        names.addAll(Arrays.asList(aliases));
+    }
+
+    @Override
+    public String getMainKey() {
+        return namesModifiable.isEmpty() ? null : namesModifiable.get(0);
+    }
+
+    @Override
+    public String getAddress() {
+        ICommandAddress address = this;
+        int depth = getDepth();
+        String[] keys = new String[depth];
+        for (int i = depth - 1; i >= 0; i--) {
+            keys[i] = address.getMainKey();
+            address = address.getParent();
+        }
+        return String.join(" ", keys);
+    }
+
+    public void finalizeNames() {
+        if (names instanceof ArrayList) {
+            names = Collections.unmodifiableList(namesModifiable);
+        }
+    }
+
+    Iterator<String> modifiableNamesIterator() {
+        return namesModifiable.iterator();
+    }
+
+    void setParent(ModifiableCommandAddress parent) {
+        finalizeNames();
+        this.parent = parent;
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/Command.java b/dicore3/command/src/main/java/io/dico/dicore/command/Command.java
new file mode 100644
index 0000000..0ba04b1
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/Command.java
@@ -0,0 +1,191 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.command.IContextFilter.Priority;
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.parameter.IArgumentPreProcessor;
+import io.dico.dicore.command.parameter.Parameter;
+import io.dico.dicore.command.parameter.ParameterList;
+import io.dico.dicore.command.parameter.type.ParameterType;
+import org.bukkit.Location;
+import org.bukkit.command.CommandSender;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+public abstract class Command {
+    private static final String[] EMPTY_DESCRIPTION = new String[0];
+    private final ParameterList parameterList = new ParameterList();
+    private final List<IContextFilter> contextFilters = new ArrayList<>(3);
+    private String[] description = EMPTY_DESCRIPTION;
+    private String shortDescription;
+
+    public Command addParameter(Parameter<?, ?> parameter) {
+        parameterList.addParameter(parameter);
+        return this;
+    }
+
+    public <TType> Command addParameter(String name, String description, ParameterType<TType, Void> type) {
+        return addParameter(Parameter.newParameter(name, description, type, null, false, null));
+    }
+
+    public <TType, TParamInfo> Command addParameter(String name, String description, ParameterType<TType, TParamInfo> type, TParamInfo paramInfo) {
+        return addParameter(Parameter.newParameter(name, description, type, paramInfo, false, null));
+    }
+
+    public <TType> Command addFlag(String name, String description, ParameterType<TType, Void> type) {
+        return addParameter(Parameter.newParameter('-' + name, description, type, null, true, null));
+    }
+
+    public <TType, TParamInfo> Command addFlag(String name, String description, ParameterType<TType, TParamInfo> type, TParamInfo paramInfo) {
+        return addParameter(Parameter.newParameter('-' + name, description, type, paramInfo, true, null));
+    }
+
+    public <TType> Command addAuthorizedFlag(String name, String description, ParameterType<TType, Void> type, String permission) {
+        return addParameter(Parameter.newParameter('-' + name, description, type, null, true, permission));
+    }
+
+    public <TType, TParamInfo> Command addAuthorizedFlag(String name, String description, ParameterType<TType, TParamInfo> type, TParamInfo paramInfo, String permission) {
+        return addParameter(Parameter.newParameter('-' + name, description, type, paramInfo, true, permission));
+    }
+
+    public Command requiredParameters(int requiredParameters) {
+        parameterList.setRequiredCount(requiredParameters);
+        return this;
+    }
+
+    public Command repeatFinalParameter() {
+        parameterList.setRepeatFinalParameter(true);
+        return this;
+    }
+
+    public Command setDescription(String... description) {
+        this.description = Objects.requireNonNull(description);
+        return this;
+    }
+
+    public Command setShortDescription(String shortDescription) {
+        this.shortDescription = shortDescription;
+        return this;
+    }
+
+    public Command preprocessArguments(IArgumentPreProcessor processor) {
+        parameterList.setArgumentPreProcessor(processor);
+        return this;
+    }
+
+    public final ParameterList getParameterList() {
+        return parameterList;
+    }
+
+    public final String[] getDescription() {
+        return description.length == 0 ? description : description.clone();
+    }
+
+    public String getShortDescription() {
+        return shortDescription;
+    }
+
+    /**
+     * ---- CONTEXT FILTERS ----
+     * Filter the contexts. For example, if the sender must be a player but it's the console,
+     * throw a CommandException describing the problem.
+     * <p>
+     * The index of the first element in contextFilters whose priority is POST_PARAMETERS
+     * Computed by {@link #computeContextFilterPostParameterIndex()}
+     */
+    private transient int contextFilterPostParameterIndex;
+
+    public Command addContextFilter(IContextFilter contextFilter) {
+        Objects.requireNonNull(contextFilter);
+        if (!contextFilters.contains(contextFilter)) {
+            contextFilters.add(contextFilter);
+            contextFilters.sort(null);
+            computeContextFilterPostParameterIndex();
+        }
+        return this;
+    }
+
+    public List<IContextFilter> getContextFilters() {
+        return Collections.unmodifiableList(contextFilters);
+    }
+
+    public boolean removeContextFilter(IContextFilter contextFilter) {
+        boolean ret = contextFilters.remove(contextFilter);
+        if (ret) {
+            computeContextFilterPostParameterIndex();
+        }
+        return ret;
+    }
+
+    private void computeContextFilterPostParameterIndex() {
+        List<IContextFilter> contextFilters = this.contextFilters;
+        contextFilterPostParameterIndex = 0;
+        for (int i = contextFilters.size() - 1; i >= 0; i--) {
+            if (contextFilters.get(i).getPriority() != Priority.POST_PARAMETERS) {
+                contextFilterPostParameterIndex = i + 1;
+            }
+        }
+    }
+
+    // ---- CONTROL FLOW IN COMMAND TREES ----
+
+    public boolean isVisibleTo(CommandSender sender) {
+        return true;
+    }
+
+    public boolean takePrecedenceOverSubcommand(String subCommand, ArgumentBuffer buffer) {
+        return false;
+    }
+
+    // ---- EXECUTION ----
+
+    public void execute(CommandSender sender, ICommandAddress caller, ArgumentBuffer buffer) {
+        ExecutionContext executionContext = new ExecutionContext(sender, caller, this, buffer, false);
+
+        try {
+            //System.out.println("In Command.execute(sender, caller, buffer)#try{");
+            int i, n;
+            for (i = 0, n = contextFilterPostParameterIndex; i < n; i++) {
+                contextFilters.get(i).filterContext(executionContext);
+            }
+
+            executionContext.parseParameters();
+
+            for (n = contextFilters.size(); i < n; i++) {
+                contextFilters.get(i).filterContext(executionContext);
+            }
+
+            //System.out.println("Post-contextfilters");
+
+            String message = execute(sender, executionContext);
+            caller.getChatController().sendMessage(sender, EMessageType.RESULT, message);
+        } catch (Throwable t) {
+            caller.getChatController().handleException(sender, executionContext, t);
+        }
+    }
+
+    public abstract String execute(CommandSender sender, ExecutionContext context) throws CommandException;
+
+    public List<String> tabComplete(CommandSender sender, ICommandAddress caller, Location location, ArgumentBuffer buffer) {
+        ExecutionContext executionContext = new ExecutionContext(sender, caller, this, buffer, true);
+
+        try {
+            int i, n;
+            for (i = 0, n = contextFilterPostParameterIndex; i < n; i++) {
+                contextFilters.get(i).filterContext(executionContext);
+            }
+        } catch (CommandException ex) {
+            return Collections.emptyList();
+        }
+
+        executionContext.parseParametersQuietly();
+        return tabComplete(sender, executionContext, location);
+    }
+
+    public List<String> tabComplete(CommandSender sender, ExecutionContext context, Location location) {
+        return context.getSuggestedCompletions(location);
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/CommandBuilder.java b/dicore3/command/src/main/java/io/dico/dicore/command/CommandBuilder.java
new file mode 100644
index 0000000..59eebf9
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/CommandBuilder.java
@@ -0,0 +1,380 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.command.chat.IChatController;
+import io.dico.dicore.command.parameter.type.IParameterTypeSelector;
+import io.dico.dicore.command.parameter.type.MapBasedParameterTypeSelector;
+import io.dico.dicore.command.parameter.type.ParameterType;
+import io.dico.dicore.command.predef.HelpCommand;
+import io.dico.dicore.command.predef.PredefinedCommand;
+import io.dico.dicore.command.predef.SyntaxCommand;
+import io.dico.dicore.command.registration.reflect.ReflectiveRegistration;
+
+import java.util.HashSet;
+import java.util.Objects;
+import java.util.function.Consumer;
+
+/**
+ * Mimic of WorldEdit's CommandGraph
+ */
+public final class CommandBuilder {
+    private final RootCommandAddress root;
+    private ModifiableCommandAddress cur;
+    private IParameterTypeSelector selector;
+
+    /**
+     * Instantiate a new CommandBuilder with a new command root system
+     * Commands registered to this command builder might interfere with
+     * commands registered to other commands builders or by other plugins.
+     */
+    public CommandBuilder() {
+        this(new RootCommandAddress());
+    }
+
+    /**
+     * Instantiate a new CommandBuilder with a specified root address.
+     * If the root address is identical to that of another command builder,
+     * they will modify the same tree.
+     *
+     * @param root the root address
+     */
+    public CommandBuilder(RootCommandAddress root) {
+        this.root = Objects.requireNonNull(root);
+        this.cur = root;
+        this.selector = new MapBasedParameterTypeSelector(true);
+    }
+
+    /**
+     * Add a sub command at the current address
+     * The current address can be inspected using {@link #getAddress()}
+     *
+     * @param name    the name of the command
+     * @param command the command executor
+     * @param aliases any aliases
+     * @return this
+     */
+    public CommandBuilder addSubCommand(String name, Command command, String... aliases) {
+        ChildCommandAddress address = new ChildCommandAddress(command);
+        address.addNameAndAliases(name, aliases);
+        return addSubCommand(address);
+    }
+
+    /**
+     * Add a subcommand as an address at the current address
+     * The result of this call is the same as
+     * {@code addSubCommand(address.getMainKey(), address.getCommand(), address.getNames().sublist(1).toArray(new String[0]))}
+     *
+     * @param address the address
+     * @return this
+     * @throws IllegalArgumentException if {@code address.isRoot()}
+     */
+    public CommandBuilder addSubCommand(ICommandAddress address) {
+        cur.addChild(address);
+        return this;
+    }
+
+    /**
+     * Search the given class for any (static) methods using command annotations
+     * The class gets a localized parameter type selector if it defines parameter types.
+     * Any commands found are registered as sub commands to the current address.
+     *
+     * @param clazz the clazz
+     * @return this
+     * @throws IllegalArgumentException if an exception occurs while parsing the methods of this class
+     * @see #registerCommands(Class, Object)
+     */
+    public CommandBuilder registerCommands(Class<?> clazz) {
+        return registerCommands(clazz, null);
+    }
+
+    /**
+     * Search the given object's class for methods using command annotations.
+     * If the object is null, only static methods are checked. Otherwise, instance methods are also checked.
+     * The class gets a localized parameter type selector if it defines parameter types.
+     * Any commands found are registered as sub commands to the current address.
+     *
+     * @param object the object
+     * @return this
+     * @throws IllegalArgumentException if an exception occurs while parsing the methods of this class
+     * @see #registerCommands(Class, Object)
+     */
+    public CommandBuilder registerCommands(Object object) {
+        return registerCommands(object.getClass(), object);
+    }
+
+    /**
+     * Search the given class for methods using command annotations.
+     * The class gets a localized parameter type selector if it defines parameter types.
+     * Any commands found are registered as sub commands to the current address.
+     * The instance is used to invoke non-static methods.
+     *
+     * @param clazz    the class
+     * @param instance the instance, null if only static methods
+     * @return this
+     * @throws IllegalArgumentException if instance is not null and it's not an instance of the class
+     * @throws IllegalArgumentException if another exception occurs while parsing the methods of this class
+     */
+    public CommandBuilder registerCommands(Class<?> clazz, Object instance) {
+        try {
+            ReflectiveRegistration.parseCommandGroup(cur, selector, clazz, instance);
+            return this;
+        } catch (Exception ex) {
+            throw new IllegalArgumentException(ex);
+        }
+    }
+
+    /**
+     * register the {@link HelpCommand} as a sub command at the current address
+     *
+     * @return this
+     */
+    public CommandBuilder registerHelpCommand() {
+        HelpCommand.registerAsChild(cur);
+        return this;
+    }
+
+    /**
+     * register the {@link SyntaxCommand} as a sub command a the current address
+     *
+     * @return this
+     */
+    public CommandBuilder registerSyntaxCommand() {
+        SyntaxCommand.registerAsChild(cur);
+        return this;
+    }
+
+    /**
+     * Generate the predefined commands.
+     * These are presets.
+     * Examples include {@code help} and {@code syntax}.
+     * <p>
+     * Predefined commands can be registered through {@link PredefinedCommand#registerPredefinedCommandGenerator(String, Consumer)}
+     *
+     * @param commands the commands
+     * @return this
+     */
+    public CommandBuilder generatePredefinedCommands(String... commands) {
+        for (String value : commands) {
+            Consumer<ICommandAddress> subscriber = PredefinedCommand.getPredefinedCommandGenerator(value);
+            if (subscriber == null) {
+                System.out.println("[Command Warning] generated command '" + value + "' could not be found");
+            } else {
+                subscriber.accept(cur);
+            }
+        }
+        return this;
+    }
+
+    /**
+     * Unregister any childs present at the given keys.
+     * <p>
+     * This method can be used to remove unwanted keys, that might have been added
+     * outside of your control. For example, because you didn't want all commands
+     * registered by {@link #registerCommands(Class, Object)}, or because you didn't
+     * want the help command registered by {@link #group(String, String...)}
+     *
+     * @param removeAliases true if any aliases of the children present at the keys should be removed
+     * @param keys          a varargs array containing the keys
+     * @return this
+     * @throws IllegalArgumentException if keys array is empty
+     */
+    public CommandBuilder unregisterCommands(boolean removeAliases, String... keys) {
+        cur.removeChildren(removeAliases, keys);
+        return this;
+    }
+
+    /**
+     * Jump to the sub-address with the given name as main key.
+     * If an address with the exact name as main key exists,
+     * that address becomes the current address.
+     * <p>
+     * Otherwise, a new addresses is registered with the name and aliases.
+     * New addresses registered by this command have a HelpCommand added by default.
+     * <p>
+     * After this call, any registered commands are registered as a sub command
+     * to the new address. To restore the previous state, a call to {@link #parent()}
+     * should be made.
+     * <p>
+     * If the address is the target of a command, it will provide information about its sub commands
+     * using the HelpCommand.
+     *
+     * @param name    the main key
+     * @param aliases the aliases
+     * @return this
+     */
+    public CommandBuilder group(String name, String... aliases) {
+        ChildCommandAddress address = cur.getChild(name);
+        if (address == null || !name.equals(address.getMainKey())) {
+            cur.addChild(address = ChildCommandAddress.newPlaceHolderCommand(name, aliases));
+        }
+        cur = address;
+        return this;
+    }
+
+    /**
+     * Sets the description of a group created by {@link #group(String, String...)}
+     * Can be called subsequently to making a call to {@link #group(String, String...)}
+     *
+     * @param shortDescription a short description
+     * @param description      the lines of a full description.
+     * @return this
+     */
+    public CommandBuilder setGroupDescription(String shortDescription, String... description) {
+        Command command = cur.getCommand();
+        cur.setCommand(command
+                .setShortDescription(shortDescription)
+                .setDescription(description));
+        return this;
+    }
+
+    /**
+     * Jump up a level in the address
+     *
+     * @return this
+     * @throws IllegalStateException if the address is empty
+     *                               // has a depth of 0 // is at level 0
+     */
+    public CommandBuilder parent() {
+        if (cur.hasParent()) {
+            cur = cur.getParent();
+            return this;
+        }
+        throw new IllegalStateException("No parent exists at this address");
+    }
+
+    /**
+     * Jump to the root (empty) address,
+     * such that a subsequent call to {@link #parent()}
+     * will throw a {@link IllegalStateException}
+     *
+     * @return this
+     */
+    public CommandBuilder root() {
+        cur = root;
+        return this;
+    }
+
+    /**
+     * Get the current address, as a space-separated string
+     *
+     * @return the current address
+     */
+    public String getAddress() {
+        return cur.getAddress();
+    }
+
+    /**
+     * Get the depth of the current address.
+     * This is equivalent to {@code getAddress().split(" ").length}.
+     * If the address is empty, the depth is 0.
+     *
+     * @return the depth
+     */
+    public int getDepth() {
+        return cur.getDepth();
+    }
+
+    /**
+     * Set the command at the current group. The command is set
+     * a level higher than it would be if this were a call to {@link #addSubCommand(String, Command, String...)}
+     * <p>
+     * If a call to {@link #setGroupDescription(String, String...)} was made at the same address before,
+     * the description is copied to the given executor.
+     *
+     * @param command the executor
+     * @return this
+     * @throws IllegalArgumentException if the command at the address is present and declared by the user,
+     *                                  in other words, it's not a {@link PredefinedCommand}
+     */
+    public CommandBuilder setCommand(Command command) {
+        Command current = cur.getCommand();
+        if (current instanceof HelpCommand && current != HelpCommand.INSTANCE) {
+            command.setShortDescription(current.getShortDescription());
+            command.setDescription(current.getDescription());
+        }
+
+        cur.setCommand(command);
+        return this;
+    }
+
+    /**
+     * Configure the chat controller at this address. The chat controller
+     * is used for all children down the tree if they don't explicitly have
+     * their own chat controller configured. If this isn't configured,
+     * {@code ChatControllers.defaultChat()} is used.
+     *
+     * @param chatController the chat controller
+     * @return this
+     */
+    public CommandBuilder setChatController(IChatController chatController) {
+        cur.setChatController(chatController);
+        return this;
+    }
+
+    /**
+     * Add the parameter type to this builder's selector.
+     *
+     * @param type the type
+     * @param <T>  the return type of the parameter type
+     * @return this
+     */
+    public <T> CommandBuilder addParameterType(ParameterType<T, Void> type) {
+        selector.addType(false, type);
+        return this;
+    }
+
+    /**
+     * Add the parameter type to this builder's selector.
+     *
+     * @param infolessAlias whether to also register the type with an infoless alias.
+     *                      this increases the priority assigned to the type if no info object is present.
+     * @param type          the type
+     * @param <T>           the return type of the parameter type
+     * @param <C>           the parameter config type (info object)
+     * @return this
+     */
+
+    public <T, C> CommandBuilder addParameterType(boolean infolessAlias, ParameterType<T, C> type) {
+        selector.addType(infolessAlias, type);
+        return this;
+    }
+
+    /**
+     * Get the dispatcher for the root address.
+     * The dispatcher should be used to finally register all commands,
+     * after they are all declared.
+     *
+     * @return the dispatcher
+     */
+    public ICommandDispatcher getDispatcher() {
+        return root;
+    }
+
+    /**
+     * Print debugging information about the current addresses and commands in this builder
+     * A StackTraceElement indicating where this was called from is also included
+     *
+     * @return this
+     */
+    public CommandBuilder printDebugInformation() {
+        String address = cur == root ? "<root>" : cur.getAddress();
+        StackTraceElement caller = getCallsite();
+
+        StringBuilder message = new StringBuilder("### CommandBuilder dump ###");
+        message.append("\nCalled from ").append(caller);
+        message.append("\nPosition: ").append(address);
+        cur.appendDebugInformation(message, "", new HashSet<>());
+
+        System.out.println(message);
+        return this;
+    }
+
+    private static StackTraceElement getCallsite() {
+        // [0] Thread.currentThread()
+        // [1] CommandBuilder.getCallsite()
+        // [2] Calling method
+        // [3] Method calling the calling method
+        StackTraceElement[] trace = Thread.currentThread().getStackTrace();
+        return trace.length > 3 ? trace[3] : null;
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/CommandException.java b/dicore3/command/src/main/java/io/dico/dicore/command/CommandException.java
new file mode 100644
index 0000000..b859952
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/CommandException.java
@@ -0,0 +1,28 @@
+package io.dico.dicore.command;
+
+public class CommandException extends Exception {
+
+    public CommandException() {
+    }
+
+    public CommandException(String message) {
+        super(message);
+    }
+
+    public CommandException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public CommandException(Throwable cause) {
+        super(cause);
+    }
+
+    public static CommandException missingArgument(String parameterName) {
+        return new CommandException("Missing argument for " + parameterName);
+    }
+
+    public static CommandException invalidArgument(String parameterName, String syntaxHelp) {
+        return new CommandException("Invalid input for " + parameterName + ", should be " + syntaxHelp);
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/CommandResult.java b/dicore3/command/src/main/java/io/dico/dicore/command/CommandResult.java
new file mode 100644
index 0000000..7c4a891
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/CommandResult.java
@@ -0,0 +1,23 @@
+package io.dico.dicore.command;
+
+/**
+ * This enum is intended to provide some constants for default messages.
+ * Can be returned by a reflective command.
+ * Currently, no constants have an actual message.
+ * Prone to removal in the future because of lack of usefullness.
+ */
+public enum CommandResult {
+    SUCCESS(null),
+    QUIET_ERROR(null);
+
+    private final String message;
+
+    CommandResult(String message) {
+        this.message = message;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/EMessageType.java b/dicore3/command/src/main/java/io/dico/dicore/command/EMessageType.java
new file mode 100644
index 0000000..fba8780
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/EMessageType.java
@@ -0,0 +1,19 @@
+package io.dico.dicore.command;
+
+public enum EMessageType {
+    GOOD_NEWS,
+    BAD_NEWS,
+    NEUTRAL,
+    INFORMATIVE,
+    WARNING,
+    INSTRUCTION,
+    EXCEPTION,
+    RESULT,
+    CUSTOM,
+
+    DESCRIPTION,
+    SYNTAX,
+    HIGHLIGHT,
+    SUBCOMMAND,
+    NUMBER,
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/EOverridePolicy.java b/dicore3/command/src/main/java/io/dico/dicore/command/EOverridePolicy.java
new file mode 100644
index 0000000..83b0151
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/EOverridePolicy.java
@@ -0,0 +1,12 @@
+package io.dico.dicore.command;
+
+/**
+ * Override policies for registering to the command map
+ */
+public enum EOverridePolicy {
+    OVERRIDE_ALL,
+    MAIN_KEY_ONLY,
+    MAIN_AND_FALLBACK,
+    FALLBACK_ONLY,
+    OVERRIDE_NONE
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/ExecutionContext.java b/dicore3/command/src/main/java/io/dico/dicore/command/ExecutionContext.java
new file mode 100644
index 0000000..4c014fb
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/ExecutionContext.java
@@ -0,0 +1,352 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.command.chat.Formatting;
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.parameter.ContextParser;
+import io.dico.dicore.command.parameter.Parameter;
+import io.dico.dicore.command.parameter.ParameterList;
+import org.bukkit.Location;
+import org.bukkit.command.CommandSender;
+
+import java.util.*;
+
+/**
+ * The context of execution.
+ * <p>
+ * This class is responsible for the control flow of parameter parsing, as well as caching and providing the parsed parameter values.
+ * It is also responsible for keeping track of the parameter to complete in the case of a tab completion.
+ */
+public class ExecutionContext {
+    private final CommandSender sender;
+    private final ICommandAddress address;
+    private final Command command;
+    private final ArgumentBuffer originalBuffer;
+    private final ArgumentBuffer processedBuffer;
+
+    // caches the buffer's cursor before parsing. This is needed to provide the original input of the player.
+    private final int cursorStart;
+
+    // when the context starts parsing parameters, this flag is set, and any subsequent calls to #parseParameters() throw an IllegalStateException.
+    private boolean attemptedToParse;
+
+
+    // The parsed parameter values, mapped by parameter name.
+    // This also includes default values. All parameters from the parameter list are present if parsing was successful.
+    private Map<String, Object> parameterValueMap;
+    // this set contains the names of the parameters that were present in the command, and not given a default value.
+    private Set<String> parsedParameters;
+
+    // if this flag is set, this execution is only for completion purposes.
+    private boolean tabComplete;
+    // these fields store information required to provide completions.
+    // the parameter to complete is the parameter that threw an exception when it was parsing.
+    // the exception's message was discarded because it is a completion.
+    private Parameter<?, ?> parameterToComplete;
+    // this is the cursor that the ArgumentBuffer is reset to when suggested completions are requested.
+    private int parameterToCompleteCursor = -1;
+
+    // if this flag is set, any messages sent through the sendMessage methods are discarded.
+    private boolean muted;
+
+    /**
+     * Construct an execution context, making it ready to parse the parameter values.
+     *
+     * @param sender      the sender
+     * @param address     the address
+     * @param buffer      the arguments
+     * @param tabComplete true if this execution is a tab-completion
+     */
+    public ExecutionContext(CommandSender sender, ICommandAddress address, Command command, ArgumentBuffer buffer, boolean tabComplete) {
+        this.sender = Objects.requireNonNull(sender);
+        this.address = Objects.requireNonNull(address);
+        this.command = Objects.requireNonNull(command);
+        this.muted = tabComplete;
+        this.tabComplete = tabComplete;
+
+        // If its tab completing, keep the empty element that might be at the end of the buffer
+        // due to a space at the end of the command.
+        // This allows the parser to correctly identify the parameter to be completed in this case.
+        if (!tabComplete) {
+            buffer.dropTrailingEmptyElements();
+        }
+
+        this.originalBuffer = buffer;
+        this.processedBuffer = buffer.preprocessArguments(getParameterList().getArgumentPreProcessor());
+        this.cursorStart = buffer.getCursor();
+    }
+
+    /**
+     * Parse the parameters. If no exception is thrown, they were parsed successfully, and the command may continue post-parameter execution.
+     *
+     * @throws CommandException if an error occurs while parsing the parameters.
+     */
+    public synchronized void parseParameters() throws CommandException {
+        if (attemptedToParse) {
+            throw new IllegalStateException();
+        }
+
+        attemptedToParse = true;
+
+        ContextParser parser = new ContextParser(this);
+
+        parameterValueMap = parser.getValueMap();
+        parsedParameters = parser.getParsedKeys();
+
+        parser.parse();
+    }
+
+
+    /**
+     * Attempts to parse parameters, without throwing an exception or sending any message.
+     * This method is typically used by tab completions.
+     * After calling this method, the context is ready to provide completions.
+     */
+    public synchronized void parseParametersQuietly() {
+        if (attemptedToParse) {
+            throw new IllegalStateException();
+        }
+
+        attemptedToParse = true;
+
+        boolean before = muted;
+        muted = true;
+        try {
+            ContextParser parser = new ContextParser(this);
+
+            parameterValueMap = parser.getValueMap();
+            parsedParameters = parser.getParsedKeys();
+
+            parser.parse();
+
+            parameterToComplete = parser.getCompletionTarget();
+            parameterToCompleteCursor = parser.getCompletionCursor();
+
+        } catch (CommandException ignored) {
+
+        } finally {
+            muted = before;
+        }
+    }
+
+    /**
+     * Sender of the command
+     *
+     * @return the sender of the command
+     */
+    public CommandSender getSender() {
+        return sender;
+    }
+
+    /**
+     * Command's address
+     *
+     * @return the command's address
+     */
+    public ICommandAddress getAddress() {
+        return address;
+    }
+
+    /**
+     * The command
+     *
+     * @return the command
+     */
+    public Command getCommand() {
+        return command;
+    }
+
+    /**
+     * The command's parameter definition.
+     *
+     * @return the parameter list
+     */
+    public ParameterList getParameterList() {
+        return command.getParameterList();
+    }
+
+    /**
+     * Get the buffer as it was before preprocessing the arguments.
+     *
+     * @return the original buffer
+     */
+    public ArgumentBuffer getOriginalBuffer() {
+        return originalBuffer;
+    }
+
+    /**
+     * The arguments
+     *
+     * @return the argument buffer
+     */
+    public ArgumentBuffer getProcessedBuffer() {
+        return processedBuffer;
+    }
+
+    /**
+     * The cursor start, in other words, the buffer's cursor before parameters were parsed.
+     *
+     * @return the cursor start
+     */
+    public int getCursorStart() {
+        return cursorStart;
+    }
+
+    /**
+     * The original arguments.
+     *
+     * @return original arguments.
+     */
+    public String[] getOriginal() {
+        return originalBuffer.getArrayFromIndex(cursorStart);
+    }
+
+    public Formatting getFormat(EMessageType type) {
+        return address.getChatController().getChatFormatForType(type);
+    }
+
+    /**
+     * The full command as cached by the buffer. Might be incomplete depending on how it was dispatched.
+     *
+     * @return the full command
+     */
+    public String getRawInput() {
+        return originalBuffer.getRawInput();
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T> T get(String name) {
+        if (!parameterValueMap.containsKey(name)) {
+            throw new IllegalArgumentException();
+        }
+
+        try {
+            return (T) parameterValueMap.get(name);
+        } catch (ClassCastException ex) {
+            throw new IllegalArgumentException("Invalid type parameter requested for parameter " + name, ex);
+        }
+    }
+
+    @SuppressWarnings("unchecked")
+    public <T> T get(int index) {
+        return get(getParameterList().getIndexedParameterName(index));
+    }
+
+    public <T> T getFlag(String flag) {
+        return get("-" + flag);
+    }
+
+    /**
+     * Checks if the parameter by the name was provided in the command's arguments.
+     *
+     * @param name the parameter name
+     * @return true if it was provided
+     */
+    public boolean isProvided(String name) {
+        return parsedParameters.contains(name);
+    }
+
+    /**
+     * Checks if the parameter by the index was provided in the command's arguments.
+     *
+     * @param index the parameter index
+     * @return true if it was provided
+     */
+    public boolean isProvided(int index) {
+        return isProvided(getParameterList().getIndexedParameterName(index));
+    }
+
+    /**
+     * The parameter to complete.
+     * This parameter is requested suggestions
+     *
+     * @return the parameter to complete.
+     */
+    public Parameter<?, ?> getParameterToComplete() {
+        return parameterToComplete;
+    }
+
+    /**
+     * @return true if this context is muted.
+     */
+    public boolean isMuted() {
+        return muted;
+    }
+
+    /**
+     * @return true if this context is for a tab completion.
+     */
+    public boolean isTabComplete() {
+        return tabComplete;
+    }
+
+    /**
+     * Get suggested completions.
+     *
+     * @param location The location as passed to {link org.bukkit.command.Command#tabComplete(CommandSender, String, String[], Location)}, or null if requested in another way.
+     * @return completions.
+     */
+    public List<String> getSuggestedCompletions(Location location) {
+        if (parameterToComplete != null) {
+            return parameterToComplete.complete(this, location, processedBuffer.getUnaffectingCopy().setCursor(parameterToCompleteCursor));
+        }
+
+        ParameterList parameterList = getParameterList();
+        List<String> result = new ArrayList<>();
+        for (String name : parameterValueMap.keySet()) {
+            if (parameterList.getParameterByName(name).isFlag() && !parsedParameters.contains(name)) {
+                result.add(name);
+            }
+        }
+        return result;
+    }
+
+    public void sendMessage(String message) {
+        sendMessage(true, message);
+    }
+
+    public void sendMessage(EMessageType messageType, String message) {
+        sendMessage(messageType, true, message);
+    }
+
+    public void sendMessage(boolean translateColours, String message) {
+        sendMessage(EMessageType.NEUTRAL, translateColours, message);
+    }
+
+    public void sendMessage(EMessageType messageType, boolean translateColours, String message) {
+        if (!muted) {
+            if (translateColours) {
+                message = Formatting.translateChars('&', message);
+            }
+            address.getChatController().sendMessage(this, messageType, message);
+        }
+    }
+
+    public void sendMessage(String messageFormat, Object... args) {
+        sendMessage(true, messageFormat, args);
+    }
+
+    public void sendMessage(EMessageType messageType, String messageFormat, Object... args) {
+        sendMessage(messageType, true, messageFormat, args);
+    }
+
+    public void sendMessage(boolean translateColours, String messageFormat, Object... args) {
+        sendMessage(EMessageType.NEUTRAL, translateColours, messageFormat, args);
+    }
+
+    public void sendMessage(EMessageType messageType, boolean translateColours, String messageFormat, Object... args) {
+        sendMessage(messageType, translateColours, String.format(messageFormat, args));
+    }
+
+    public void sendHelpMessage(int page) {
+        if (!muted) {
+            address.getChatController().sendHelpMessage(sender, this, address, page);
+        }
+    }
+
+    public void sendSyntaxMessage() {
+        if (!muted) {
+            address.getChatController().sendSyntaxMessage(sender, this, address);
+        }
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/ExtendedCommand.java b/dicore3/command/src/main/java/io/dico/dicore/command/ExtendedCommand.java
new file mode 100644
index 0000000..602760c
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/ExtendedCommand.java
@@ -0,0 +1,52 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.command.parameter.IArgumentPreProcessor;
+import io.dico.dicore.command.parameter.Parameter;
+
+@SuppressWarnings("unchecked")
+public abstract class ExtendedCommand<T extends ExtendedCommand<T>> extends Command {
+    protected final boolean modifiable;
+
+    public ExtendedCommand() {
+        this(true);
+    }
+
+    public ExtendedCommand(boolean modifiable) {
+        this.modifiable = modifiable;
+    }
+
+    protected T newModifiableInstance() {
+        return (T) this;
+    }
+
+    @Override
+    public T addParameter(Parameter<?, ?> parameter) {
+        return modifiable ? (T) super.addParameter(parameter) : newModifiableInstance().addParameter(parameter);
+    }
+
+    @Override
+    public T requiredParameters(int requiredParameters) {
+        return modifiable ? (T) super.requiredParameters(requiredParameters) : newModifiableInstance().requiredParameters(requiredParameters);
+    }
+
+    @Override
+    public T repeatFinalParameter() {
+        return modifiable ? (T) super.repeatFinalParameter() : newModifiableInstance().repeatFinalParameter();
+    }
+
+    @Override
+    public T setDescription(String... description) {
+        return modifiable ? (T) super.setDescription(description) : newModifiableInstance().setDescription(description);
+    }
+
+    @Override
+    public T setShortDescription(String shortDescription) {
+        return modifiable ? (T) super.setShortDescription(shortDescription) : newModifiableInstance().setShortDescription(shortDescription);
+    }
+
+    @Override
+    public T preprocessArguments(IArgumentPreProcessor processor) {
+        return modifiable ? (T) super.preprocessArguments(processor) : newModifiableInstance().preprocessArguments(processor);
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/ICommandAddress.java b/dicore3/command/src/main/java/io/dico/dicore/command/ICommandAddress.java
new file mode 100644
index 0000000..d6cd350
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/ICommandAddress.java
@@ -0,0 +1,152 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.command.chat.IChatController;
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.predef.PredefinedCommand;
+import org.bukkit.command.CommandSender;
+
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Interface for an address of a command.
+ * <p>
+ * The address holds what the name and aliases of a command are.
+ * The address also (optionally) holds a reference to a {@link Command}
+ * <p>
+ * One instance of {@link Command} can be held by multiple addresses,
+ * because the address decides what the command's name and aliases are.
+ * <p>
+ * The address holds children by key in a map. This map's keys include aliases for its children.
+ * This creates a tree of addresses. If a command is dispatches, the tree is traversed untill a command is found
+ * and no children deeper down match the command (there are exceptions to the later as defined by
+ * {@link Command#takePrecedenceOverSubcommand(String, ArgumentBuffer)}
+ * and {@link Command#isVisibleTo(CommandSender)}
+ */
+public interface ICommandAddress {
+
+    /**
+     * @return true if this address has a parent.
+     */
+    boolean hasParent();
+
+    /**
+     * Get the parent of this address
+     *
+     * @return the parent of this address, or null if none exists.
+     */
+    ICommandAddress getParent();
+
+    /**
+     * @return true if this address has a command.
+     */
+    boolean hasCommand();
+
+    /**
+     * @return true if this address has a command that is not an instance of {@link PredefinedCommand}
+     */
+    boolean hasUserDeclaredCommand();
+
+    /**
+     * @return Get the command of this address, or null if none exists.
+     */
+    Command getCommand();
+
+    /**
+     * @return true if this address is an instance of {@link RootCommandAddress}
+     */
+    boolean isRoot();
+
+    /**
+     * @return the root address of the tree which this address resides in.
+     */
+    ICommandAddress getRoot();
+
+    /**
+     * A list of the names of this address, at the current level.
+     * The first entry is the main key, the subsequent ones are aliases.
+     * <p>
+     * Untill an address is assigned a parent, this list is mutable.
+     * <p>
+     * If {@link #isRoot()}, this returns an immutable, empty list.
+     *
+     * @return the list of names.
+     */
+    List<String> getNames();
+
+    /**
+     * A list of the aliases of this address. That is, {@link #getNames()}
+     * without the first entry.
+     *
+     * @return a list of aliases
+     */
+    List<String> getAliases();
+
+    /**
+     * @return The first element of {@link #getNames()}
+     */
+    String getMainKey();
+
+    /**
+     * Get the address of this command.
+     * That is, the main keys of all commands leading up to this address, and this address itself, separated by a space.
+     * In other words, the command without the / that is required to target the command at this address.
+     *
+     * @return the address of this command.
+     */
+    String getAddress();
+
+    /**
+     * Get the amount of addresses that separate this address from the root of the tree, + 1.
+     * The root of the tree has a depth of 0. Each subsequent child has its depth incremented by 1.
+     *
+     * @return The depth of this address
+     */
+    int getDepth();
+
+    /**
+     * @return true if the depth of this address is larger than the argument.
+     */
+    boolean isDepthLargerThan(int depth);
+
+    /**
+     * Get an unmodifiable view of the children of this address.
+     * Values might be duplicated for aliases.
+     *
+     * @return the children of this address.
+     */
+    Map<String, ? extends ICommandAddress> getChildren();
+
+    /**
+     * Query for a child at the given key.
+     *
+     * @param key the key. The name or alias of a command.
+     * @return the child, or null if it's not found
+     */
+    ICommandAddress getChild(String key);
+
+    /**
+     * Get the command dispatcher for this tree
+     *
+     * @return the command dispatcher
+     */
+    ICommandDispatcher getDispatcherForTree();
+
+    /**
+     * @return The desired chatcontroller for use by commands at this address and any sub-addresses, if they define no explicit chat controller.
+     */
+    IChatController getChatController();
+
+    static ICommandAddress newChild() {
+        return new ChildCommandAddress();
+    }
+
+    static ICommandAddress newChild(Command command) {
+        return new ChildCommandAddress(command);
+    }
+
+    static ICommandAddress newRoot() {
+        return new RootCommandAddress();
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/ICommandDispatcher.java b/dicore3/command/src/main/java/io/dico/dicore/command/ICommandDispatcher.java
new file mode 100644
index 0000000..b18694e
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/ICommandDispatcher.java
@@ -0,0 +1,131 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.registration.CommandMap;
+import org.bukkit.Location;
+import org.bukkit.command.CommandSender;
+
+import java.util.List;
+import java.util.Map;
+
+public interface ICommandDispatcher {
+
+    /**
+     * Get a potentially indirect child of the root of this dispatcher
+     *
+     * @param buffer the argument buffer with the subsequent keys to traverse. Any keys beyond the first that isn't found are ignored.
+     * @return the child, or this same instance of no child is found.
+     */
+    ICommandAddress getDeepChild(ArgumentBuffer buffer);
+
+    /**
+     * Similar to {@link #getDeepChild(ArgumentBuffer)},
+     * but this method incorporates checks on the command of traversed children:
+     * {@link Command#isVisibleTo(CommandSender)}
+     * and {@link Command#takePrecedenceOverSubcommand(String, ArgumentBuffer)}
+     * <p>
+     * The target of a command is never null, however, the same instance might be returned, and the returned address might not hold a command.
+     *
+     * @param sender the sender of the command
+     * @param buffer the command itself as a buffer.
+     * @return the address that is the target of the command.
+     */
+    ICommandAddress getCommandTarget(CommandSender sender, ArgumentBuffer buffer);
+
+    /**
+     * dispatch the command
+     *
+     * @param sender  the sender
+     * @param command the command
+     * @return true if a command has executed
+     */
+    boolean dispatchCommand(CommandSender sender, String[] command);
+
+    /**
+     * dispatch the command
+     *
+     * @param sender    the sender
+     * @param usedLabel the label (word after the /)
+     * @param args      the arguments
+     * @return true if a command has executed
+     */
+    boolean dispatchCommand(CommandSender sender, String usedLabel, String[] args);
+
+    /**
+     * dispatch the command
+     *
+     * @param sender the sender
+     * @param buffer the command
+     * @return true if a command has executed
+     */
+    boolean dispatchCommand(CommandSender sender, ArgumentBuffer buffer);
+
+    /**
+     * suggest tab completions
+     *
+     * @param sender the sender as passed to {@link org.bukkit.command.Command#tabComplete(CommandSender, String, String[], Location)}
+     * @param location the location as passed to {@link org.bukkit.command.Command#tabComplete(CommandSender, String, String[], Location)}
+     * @param args the arguments as passed to {@link org.bukkit.command.Command#tabComplete(CommandSender, String, String[], Location)}
+     *             args must be sanitized such that it contains no empty elements, particularly at the last index.
+     * @return tab completions
+     */
+    List<String> getTabCompletions(CommandSender sender, Location location, String[] args);
+
+    /**
+     * suggest tab completions
+     *
+     * @param sender the sender as passed to {@link org.bukkit.command.Command#tabComplete(CommandSender, String, String[], Location)}
+     * @param usedLabel the label as passed to {@link org.bukkit.command.Command#tabComplete(CommandSender, String, String[], Location)}
+     * @param location the location as passed to {@link org.bukkit.command.Command#tabComplete(CommandSender, String, String[], Location)}
+     * @param args the arguments as passed to {@link org.bukkit.command.Command#tabComplete(CommandSender, String, String[], Location)}
+     * @return tab completions
+     */
+    List<String> getTabCompletions(CommandSender sender, String usedLabel, Location location, String[] args);
+
+    /**
+     * suggest tab completions
+     *
+     * @param sender the sender as passed to {@link org.bukkit.command.Command#tabComplete(CommandSender, String, String[], Location)}
+     * @param location the location as passed to {@link org.bukkit.command.Command#tabComplete(CommandSender, String, String[], Location)}
+     * @param buffer the arguments as a buffer
+     * @return tab completions
+     */
+    List<String> getTabCompletions(CommandSender sender, Location location, ArgumentBuffer buffer);
+
+    /**
+     * Register this dispatcher's commands to the command map
+     *
+     * @throws UnsupportedOperationException if this dispatcher is not the root of the tree
+     */
+    default void registerToCommandMap() {
+        registerToCommandMap(null, CommandMap.getCommandMap(), EOverridePolicy.OVERRIDE_ALL);
+    }
+
+    /**
+     * Register this dispatcher's commands to the command map
+     *
+     * @param fallbackPrefix the fallback prefix to use, null if none
+     * @param overridePolicy the override policy
+     * @throws UnsupportedOperationException if this dispatcher is not the root of the tree
+     */
+    default void registerToCommandMap(String fallbackPrefix, EOverridePolicy overridePolicy) {
+        registerToCommandMap(fallbackPrefix, CommandMap.getCommandMap(), overridePolicy);
+    }
+
+    /**
+     * Register this dispatcher's commands to the command map
+     *
+     * @param fallbackPrefix the fallback prefix to use, null if none
+     * @param map            the command map
+     * @param overridePolicy the override policy
+     * @throws UnsupportedOperationException if this dispatcher is not the root of the tree
+     */
+    void registerToCommandMap(String fallbackPrefix, Map<String, org.bukkit.command.Command> map, EOverridePolicy overridePolicy);
+
+    default void unregisterFromCommandMap() {
+        unregisterFromCommandMap(CommandMap.getCommandMap());
+    }
+
+    void unregisterFromCommandMap(Map<String, org.bukkit.command.Command> map);
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/IContextFilter.java b/dicore3/command/src/main/java/io/dico/dicore/command/IContextFilter.java
new file mode 100644
index 0000000..a60c34e
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/IContextFilter.java
@@ -0,0 +1,322 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.exceptions.checkedfunctions.CheckedConsumer;
+import io.dico.dicore.exceptions.checkedfunctions.CheckedRunnable;
+import org.bukkit.command.CommandSender;
+
+import java.util.List;
+import java.util.Objects;
+
+public interface IContextFilter extends Comparable<IContextFilter> {
+
+    /**
+     * Filter the given context by this filter's criteria.
+     * If the context does not match the criteria, an exception is thrown describing the problem.
+     *
+     * @param context the context to match
+     * @throws CommandException if it doesn't match
+     */
+    void filterContext(ExecutionContext context) throws CommandException;
+
+    /**
+     * Filter an execution context for a direct or indirect sub command of the command that registered this filter.
+     *
+     * @param subContext the context for the execution
+     * @param path       the path traversed from the command that registered this filter to the executed command
+     */
+    default void filterSubContext(ExecutionContext subContext, String... path) throws CommandException {
+        filterContext(subContext);
+    }
+
+    /**
+     * Get the priority of this context filter.
+     * The priorities determine the order in which a command's context filters are executed.
+     *
+     * @return the priority
+     */
+    Priority getPriority();
+
+    default boolean allowsContext(ExecutionContext context) {
+        try {
+            filterContext(context);
+            return true;
+        } catch (CommandException ex) {
+            return false;
+        }
+    }
+
+    /**
+     * Used to sort filters in execution order. That is, filters are ordered by {@link #getPriority()}
+     *
+     * @param o compared filter
+     * @return comparison value
+     */
+    @Override
+    default int compareTo(IContextFilter o) {
+        return getPriority().compareTo(o.getPriority());
+    }
+
+    default boolean isInheritable() {
+        return false;
+    }
+
+    default IContextFilter inherit(String... components) {
+        if (!isInheritable()) {
+            throw new IllegalStateException("This IContextFilter cannot be inherited");
+        }
+
+        return this;
+    }
+
+    /**
+     * IContextFilter priorities. Executes from top to bottom.
+     */
+    enum Priority {
+        /**
+         * This priority should have checks on the sender type.
+         * Any filters on this priority are tested before permissions are.
+         * This is the highest priority.
+         */
+        VERY_EARLY, // sender type check
+
+        /**
+         * This priority is specific to permissions.
+         */
+        PERMISSION,
+
+        /**
+         * Early priority. Post permissions, pre parameter-parsing.
+         */
+        EARLY,
+
+        /**
+         * Normal priority. Post permissions, pre parameter-parsing.
+         */
+        NORMAL,
+
+        /**
+         * Late priority. Post permissions, pre parameter-parsing.
+         */
+        LATE,
+
+        /**
+         * Very late priority. Post permissions, pre parameter-parsing.
+         */
+        VERY_LATE,
+
+        /**
+         * Post parameters priority. Post permissions, post parameter-parsing.
+         * This is the lowest priority.
+         */
+        POST_PARAMETERS;
+
+        /**
+         * Get the context filter that inherits context filters from the parent of the same priority.
+         * If this filter is also present at the parent, it will do the same for the parent's parent, and so on.
+         *
+         * @return the inheritor
+         */
+        public IContextFilter getInheritor() {
+            return inheritor;
+        }
+
+        private static String[] addParent(String[] path, String parent) {
+            String[] out = new String[path.length + 1];
+            System.arraycopy(path, 0, out, 0, path.length);
+            out[0] = parent;
+            return out;
+        }
+
+        final IContextFilter inheritor = new IContextFilter() {
+            @Override
+            public void filterContext(ExecutionContext context) throws CommandException {
+                ICommandAddress address = context.getAddress();
+
+                String[] traversedPath = new String[0];
+                do {
+                    traversedPath = addParent(traversedPath, address.getMainKey());
+                    address = address.getParent();
+
+                    if (address != null && address.hasCommand()) {
+                        boolean doBreak = true;
+
+                        Command command = address.getCommand();
+                        List<IContextFilter> contextFilterList = command.getContextFilters();
+                        for (IContextFilter filter : contextFilterList) {
+                            if (filter.getPriority() == Priority.this) {
+                                if (filter == this) {
+                                    // do the same for next parent
+                                    // this method is necessary to keep traversedPath information
+                                    doBreak = false;
+                                } else {
+                                    filter.filterSubContext(context, traversedPath);
+                                }
+                            }
+                        }
+
+                        if (doBreak) {
+                            break;
+                        }
+                    }
+                } while (address != null);
+            }
+
+            @Override
+            public Priority getPriority() {
+                return Priority.this;
+            }
+        };
+
+    }
+
+    /**
+     * Ensures that only {@link org.bukkit.entity.Player} type senders can execute the command.
+     */
+    IContextFilter PLAYER_ONLY = filterSender(Priority.VERY_EARLY, Validate::isPlayer);
+
+    /**
+     * Ensures that only {@link org.bukkit.command.ConsoleCommandSender} type senders can execute the command.
+     */
+    IContextFilter CONSOLE_ONLY = filterSender(Priority.VERY_EARLY, Validate::isConsole);
+
+    /**
+     * This filter is not working as intended.
+     * <p>
+     * There is supposed to be a permission filter that takes a base, and appends the command's address to the base, and checks that permission.
+     */
+    IContextFilter INHERIT_PERMISSIONS = Priority.PERMISSION.getInheritor();
+
+    static IContextFilter fromCheckedRunnable(Priority priority, CheckedRunnable<? extends CommandException> runnable) {
+        return new IContextFilter() {
+            @Override
+            public void filterContext(ExecutionContext context) throws CommandException {
+                runnable.checkedRun();
+            }
+
+            @Override
+            public Priority getPriority() {
+                return priority;
+            }
+        };
+    }
+
+    static IContextFilter filterSender(Priority priority, CheckedConsumer<? super CommandSender, ? extends CommandException> consumer) {
+        return new IContextFilter() {
+            @Override
+            public void filterContext(ExecutionContext context) throws CommandException {
+                consumer.checkedAccept(context.getSender());
+            }
+
+            @Override
+            public Priority getPriority() {
+                return priority;
+            }
+        };
+    }
+
+    static IContextFilter permission(String permission) {
+        Objects.requireNonNull(permission);
+        return filterSender(Priority.PERMISSION, sender -> Validate.isAuthorized(sender, permission));
+    }
+
+    static IContextFilter permission(String permission, String failMessage) {
+        Objects.requireNonNull(permission);
+        Objects.requireNonNull(failMessage);
+        return filterSender(Priority.PERMISSION, sender -> Validate.isAuthorized(sender, permission, failMessage));
+    }
+
+    /**
+     * Produce an inheritable permission context filter.
+     * A permission component is an element in {@code permission.split("\\.")}
+     *
+     * @param permission              The permission that is required for the command that this is directly assigned to
+     * @param componentInsertionIndex the index where any sub-components are inserted. -1 for "at the end".
+     * @param failMessage             the message to send if the permission is not met
+     * @return the context filter
+     * @throws IllegalArgumentException if componentInsertionIndex is out of range
+     */
+    static IContextFilter inheritablePermission(String permission, int componentInsertionIndex, String failMessage) {
+        Objects.requireNonNull(permission);
+        Objects.requireNonNull(failMessage);
+        if (componentInsertionIndex > permission.split("\\.").length || componentInsertionIndex < -1) {
+            throw new IllegalArgumentException("componentInsertionIndex out of range");
+        }
+
+
+        return new IContextFilter() {
+            private String getInheritedPermission(String[] components) {
+                int insertedAmount = components.length;
+                String[] currentComponents = permission.split("\\.");
+                int currentAmount = currentComponents.length;
+                String[] targetArray = new String[currentAmount + insertedAmount];
+
+                int insertionIndex;
+                //int newInsertionIndex;
+                if (componentInsertionIndex == -1) {
+                    insertionIndex = currentAmount;
+                    //newInsertionIndex = -1;
+                } else {
+                    insertionIndex = componentInsertionIndex;
+                    //newInsertionIndex = insertionIndex + insertedAmount;
+                }
+
+                // copy the current components up to insertionIndex
+                System.arraycopy(currentComponents, 0, targetArray, 0, insertionIndex);
+                // copy the new components into the array at insertionIndex
+                System.arraycopy(components, 0, targetArray, insertionIndex, insertedAmount);
+                // copy the current components from insertionIndex + inserted amount
+                System.arraycopy(currentComponents, insertionIndex, targetArray, insertionIndex + insertedAmount, currentAmount - insertionIndex);
+
+                return String.join(".", targetArray);
+            }
+
+            @Override
+            public void filterContext(ExecutionContext context) throws CommandException {
+                Validate.isAuthorized(context.getSender(), permission, failMessage);
+            }
+
+            @Override
+            public void filterSubContext(ExecutionContext subContext, String... path) throws CommandException {
+                Validate.isAuthorized(subContext.getSender(), getInheritedPermission(path), failMessage);
+            }
+
+            @Override
+            public Priority getPriority() {
+                return Priority.PERMISSION;
+            }
+
+            @Override
+            public boolean isInheritable() {
+                return true;
+            }
+
+            @Override
+            public IContextFilter inherit(String... components) {
+                int insertedAmount = components.length;
+                String[] currentComponents = permission.split("\\.");
+                int currentAmount = currentComponents.length;
+                String[] targetArray = new String[currentAmount + insertedAmount];
+
+                int insertionIndex;
+                int newInsertionIndex;
+                if (componentInsertionIndex == -1) {
+                    insertionIndex = currentAmount;
+                    newInsertionIndex = -1;
+                } else {
+                    insertionIndex = componentInsertionIndex;
+                    newInsertionIndex = insertionIndex + insertedAmount;
+                }
+
+                // copy the current components up to insertionIndex
+                System.arraycopy(currentComponents, 0, targetArray, 0, insertionIndex);
+                // copy the new components into the array at insertionIndex
+                System.arraycopy(components, 0, targetArray, insertionIndex, insertedAmount);
+                // copy the current components from insertionIndex + inserted amount
+                System.arraycopy(currentComponents, insertionIndex, targetArray, insertionIndex + insertedAmount, currentAmount - insertionIndex);
+
+                return inheritablePermission(String.join(".", targetArray), newInsertionIndex, failMessage);
+            }
+        };
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/LambdaCommand.java b/dicore3/command/src/main/java/io/dico/dicore/command/LambdaCommand.java
new file mode 100644
index 0000000..71b5ca4
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/LambdaCommand.java
@@ -0,0 +1,35 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.exceptions.checkedfunctions.CheckedBiFunction;
+import org.bukkit.Location;
+import org.bukkit.command.CommandSender;
+
+import java.util.List;
+import java.util.Objects;
+import java.util.function.BiFunction;
+
+public class LambdaCommand extends ExtendedCommand<LambdaCommand> {
+    private CheckedBiFunction<CommandSender, ExecutionContext, String, CommandException> executor;
+    private BiFunction<CommandSender, ExecutionContext, List<String>> completer;
+
+    public LambdaCommand executor(CheckedBiFunction<CommandSender, ExecutionContext, String, CommandException> executor) {
+        this.executor = Objects.requireNonNull(executor);
+        return this;
+    }
+
+    public LambdaCommand completer(BiFunction<CommandSender, ExecutionContext, List<String>> completer) {
+        this.completer = Objects.requireNonNull(completer);
+        return this;
+    }
+
+    @Override
+    public String execute(CommandSender sender, ExecutionContext context) throws CommandException {
+        return executor.checkedApply(sender, context);
+    }
+
+    @Override
+    public List<String> tabComplete(CommandSender sender, ExecutionContext context, Location location) {
+        return completer == null ? super.tabComplete(sender, context, location) : completer.apply(sender, context);
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/ModifiableCommandAddress.java b/dicore3/command/src/main/java/io/dico/dicore/command/ModifiableCommandAddress.java
new file mode 100644
index 0000000..698eee8
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/ModifiableCommandAddress.java
@@ -0,0 +1,258 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.command.chat.ChatControllers;
+import io.dico.dicore.command.chat.IChatController;
+import io.dico.dicore.command.predef.HelpCommand;
+import io.dico.dicore.command.predef.PredefinedCommand;
+
+import java.util.*;
+
+public abstract class ModifiableCommandAddress implements ICommandAddress {
+    Map<String, ChildCommandAddress> children;
+    // the chat controller as configured by the programmer
+    IChatController chatController;
+    // cache for the algorithm that finds the first chat controller going up the tree
+    transient IChatController chatControllerCache;
+    ModifiableCommandAddress helpChild;
+
+    public ModifiableCommandAddress() {
+        this.children = new LinkedHashMap<>(4);
+    }
+
+    @Override
+    public boolean hasParent() {
+        return getParent() != null;
+    }
+
+    @Override
+    public boolean hasCommand() {
+        return getCommand() != null;
+    }
+
+    @Override
+    public boolean hasUserDeclaredCommand() {
+        Command command = getCommand();
+        return command != null && !(command instanceof PredefinedCommand);
+    }
+
+    @Override
+    public Command getCommand() {
+        return null;
+    }
+
+    @Override
+    public boolean isRoot() {
+        return false;
+    }
+
+    @Override
+    public List<String> getNames() {
+        return null;
+    }
+
+    @Override
+    public List<String> getAliases() {
+        List<String> names = getNames();
+        if (names == null) {
+            return null;
+        }
+        if (names.isEmpty()) {
+            return Collections.emptyList();
+        }
+        return names.subList(1, names.size());
+    }
+
+    @Override
+    public String getMainKey() {
+        return null;
+    }
+
+    public void setCommand(Command command) {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public abstract ModifiableCommandAddress getParent();
+
+    @Override
+    public RootCommandAddress getRoot() {
+        ModifiableCommandAddress out = this;
+        while (out.hasParent()) {
+            out = out.getParent();
+        }
+        return out.isRoot() ? (RootCommandAddress) out : null;
+    }
+
+    @Override
+    public int getDepth() {
+        int depth = 0;
+        ICommandAddress address = this;
+        while (address.hasParent()) {
+            address = address.getParent();
+            depth++;
+        }
+        return depth;
+    }
+
+    @Override
+    public boolean isDepthLargerThan(int value) {
+        int depth = 0;
+        ICommandAddress address = this;
+        do {
+            if (depth > value) {
+                return true;
+            }
+
+            address = address.getParent();
+            depth++;
+        } while (address != null);
+        return false;
+    }
+
+    @Override
+    public Map<String, ? extends ModifiableCommandAddress> getChildren() {
+        return Collections.unmodifiableMap(children);
+    }
+
+    @Override
+    public ChildCommandAddress getChild(String key) {
+        return children.get(key);
+    }
+
+    public void addChild(ICommandAddress child) {
+        if (!(child instanceof ChildCommandAddress)) {
+            throw new IllegalArgumentException("Argument must be a ChildCommandAddress");
+        }
+
+        ChildCommandAddress mChild = (ChildCommandAddress) child;
+        if (mChild.parent != null) {
+            throw new IllegalArgumentException("Argument already has a parent");
+        }
+
+        if (mChild.names.isEmpty()) {
+            throw new IllegalArgumentException("Argument must have names");
+        }
+
+        Iterator<String> names = mChild.modifiableNamesIterator();
+        children.put(names.next(), mChild);
+
+        while (names.hasNext()) {
+            String name = names.next();
+            if (children.putIfAbsent(name, mChild) != null) {
+                names.remove();
+            }
+        }
+
+        mChild.setParent(this);
+
+        if (mChild.hasCommand() && mChild.getCommand() instanceof HelpCommand) {
+            helpChild = mChild;
+        }
+    }
+
+    public void removeChildren(boolean removeAliases, String... keys) {
+        if (keys.length == 0) {
+            throw new IllegalArgumentException("keys is empty");
+        }
+
+        for (String key : keys) {
+            ChildCommandAddress keyTarget = getChild(key);
+            if (keyTarget == null) {
+                continue;
+            }
+
+            if (removeAliases) {
+                for (Iterator<String> iterator = keyTarget.namesModifiable.iterator(); iterator.hasNext(); ) {
+                    String alias = iterator.next();
+                    ChildCommandAddress aliasTarget = getChild(key);
+                    if (aliasTarget == keyTarget) {
+                        children.remove(alias);
+                        iterator.remove();
+                    }
+                }
+                continue;
+            }
+
+            children.remove(key);
+            keyTarget.namesModifiable.remove(key);
+        }
+    }
+
+    public boolean hasHelpCommand() {
+        return helpChild != null;
+    }
+
+    public ModifiableCommandAddress getHelpCommand() {
+        return helpChild;
+    }
+
+    @Override
+    public IChatController getChatController() {
+        if (chatControllerCache == null) {
+            if (chatController != null) {
+                chatControllerCache = chatController;
+            } else if (!hasParent()) {
+                chatControllerCache = ChatControllers.defaultChat();
+            } else {
+                chatControllerCache = getParent().getChatController();
+            }
+        }
+        return chatControllerCache;
+    }
+
+    public void setChatController(IChatController chatController) {
+        this.chatController = chatController;
+        resetChatControllerCache(new HashSet<>());
+    }
+
+    void resetChatControllerCache(Set<ModifiableCommandAddress> dejaVu) {
+        if (dejaVu.add(this)) {
+            chatControllerCache = chatController;
+            for (ChildCommandAddress address : children.values()) {
+                if (address.chatController == null) {
+                    address.resetChatControllerCache(dejaVu);
+                }
+            }
+        }
+    }
+
+    @Override
+    public ICommandDispatcher getDispatcherForTree() {
+        return getRoot();
+    }
+
+    void appendDebugInformation(StringBuilder target, String linePrefix, Set<ICommandAddress> seen) {
+        target.append('\n').append(linePrefix);
+        if (!seen.add(this)) {
+            target.append("<duplicate of address '").append(getAddress()).append("'>");
+            return;
+        }
+
+        if (this instanceof ChildCommandAddress) {
+            List<String> namesModifiable = ((ChildCommandAddress) this).namesModifiable;
+            if (namesModifiable.isEmpty()) {
+                target.append("<no key>");
+            } else {
+                Iterator<String> keys = namesModifiable.iterator();
+                target.append(keys.next()).append(' ');
+                if (keys.hasNext()) {
+                    target.append('(').append(keys.next());
+                    while (keys.hasNext()) {
+                        target.append(" ,").append(keys.next());
+                    }
+                    target.append(") ");
+                }
+            }
+        } else {
+            target.append("<root> ");
+        }
+
+        String commandClass = hasCommand() ? getCommand().getClass().getCanonicalName() : "<no command>";
+        target.append(commandClass);
+
+        for (ChildCommandAddress child : new HashSet<>(children.values())) {
+            child.appendDebugInformation(target, linePrefix + "  ", seen);
+        }
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/RootCommandAddress.java b/dicore3/command/src/main/java/io/dico/dicore/command/RootCommandAddress.java
new file mode 100644
index 0000000..91dcc5b
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/RootCommandAddress.java
@@ -0,0 +1,218 @@
+package io.dico.dicore.command;
+
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.registration.BukkitCommand;
+import org.bukkit.Location;
+import org.bukkit.command.CommandSender;
+
+import java.util.*;
+
+public class RootCommandAddress extends ModifiableCommandAddress implements ICommandDispatcher {
+    @Deprecated
+    public static final RootCommandAddress INSTANCE = new RootCommandAddress();
+
+    public RootCommandAddress() {
+    }
+
+    @Override
+    public Command getCommand() {
+        return null;
+    }
+
+    @Override
+    public boolean isRoot() {
+        return true;
+    }
+
+    @Override
+    public List<String> getNames() {
+        return Collections.emptyList();
+    }
+
+    @Override
+    public ModifiableCommandAddress getParent() {
+        return null;
+    }
+
+    @Override
+    public String getMainKey() {
+        return null;
+    }
+
+    @Override
+    public String getAddress() {
+        return "";
+    }
+
+    @Override
+    public void registerToCommandMap(String fallbackPrefix, Map<String, org.bukkit.command.Command> map, EOverridePolicy overridePolicy) {
+        Objects.requireNonNull(overridePolicy);
+        //debugChildren(this);
+        Map<String, ChildCommandAddress> children = this.children;
+        Map<ChildCommandAddress, BukkitCommand> wrappers = new IdentityHashMap<>();
+
+        for (ChildCommandAddress address : children.values()) {
+            if (!wrappers.containsKey(address)) {
+                wrappers.put(address, new BukkitCommand(address));
+            }
+        }
+
+        for (Map.Entry<String, ChildCommandAddress> entry : children.entrySet()) {
+            String key = entry.getKey();
+            ChildCommandAddress address = entry.getValue();
+            boolean override = overridePolicy == EOverridePolicy.OVERRIDE_ALL;
+            if (!override && key.equals(address.getMainKey())) {
+                override = overridePolicy == EOverridePolicy.MAIN_KEY_ONLY || overridePolicy == EOverridePolicy.MAIN_AND_FALLBACK;
+            }
+
+            registerMember(map, key, wrappers.get(address), override);
+
+            if (fallbackPrefix != null) {
+                key = fallbackPrefix + key;
+                override = overridePolicy != EOverridePolicy.OVERRIDE_NONE && overridePolicy != EOverridePolicy.MAIN_KEY_ONLY;
+                registerMember(map, key, wrappers.get(address), override);
+            }
+        }
+
+    }
+
+    private static void debugChildren(ModifiableCommandAddress address) {
+        for (ModifiableCommandAddress child : new HashSet<ModifiableCommandAddress>(address.getChildren().values())) {
+            System.out.println(child.getAddress());
+            debugChildren(child);
+        }
+    }
+
+    private static void registerMember(Map<String, org.bukkit.command.Command> map, String key, org.bukkit.command.Command value, boolean override) {
+        if (override) {
+            map.put(key, value);
+        } else {
+            map.putIfAbsent(key, value);
+        }
+    }
+
+    @Override
+    public void unregisterFromCommandMap(Map<String, org.bukkit.command.Command> map) {
+        Set<ICommandAddress> children = new HashSet<>(this.children.values());
+        Iterator<Map.Entry<String, org.bukkit.command.Command>> iterator = map.entrySet().iterator();
+        while (iterator.hasNext()) {
+            Map.Entry<String, org.bukkit.command.Command> entry = iterator.next();
+            org.bukkit.command.Command cmd = entry.getValue();
+            if (cmd instanceof BukkitCommand && children.contains(((BukkitCommand) cmd).getOrigin())) {
+                iterator.remove();
+            }
+        }
+    }
+
+    @Override
+    public ModifiableCommandAddress getDeepChild(ArgumentBuffer buffer) {
+        ModifiableCommandAddress cur = this;
+        ChildCommandAddress child;
+        while (buffer.hasNext()) {
+            child = cur.getChild(buffer.next());
+            if (child == null) {
+                buffer.rewind();
+                return cur;
+            }
+
+            cur = child;
+        }
+        return cur;
+    }
+
+    @Override
+    public ModifiableCommandAddress getCommandTarget(CommandSender sender, ArgumentBuffer buffer) {
+        //System.out.println("Buffer cursor upon getCommandTarget: " + buffer.getCursor());
+
+        ModifiableCommandAddress cur = this;
+        ChildCommandAddress child;
+        while (buffer.hasNext()) {
+            child = cur.getChild(buffer.next());
+            if (child == null
+                    || (child.hasCommand() && !child.getCommand().isVisibleTo(sender))
+                    || (cur.hasCommand() && cur.getCommand().takePrecedenceOverSubcommand(buffer.peekPrevious(), buffer.getUnaffectingCopy()))) {
+                buffer.rewind();
+                break;
+            }
+
+            cur = child;
+        }
+
+        /*
+        if (!cur.hasCommand() && cur.hasHelpCommand()) {
+            cur = cur.getHelpCommand();
+        } else {
+            while (!cur.hasCommand() && cur.hasParent()) {
+                cur = cur.getParent();
+                buffer.rewind();
+            }
+        }
+        */
+
+        return cur;
+    }
+
+    @Override
+    public boolean dispatchCommand(CommandSender sender, String[] command) {
+        return dispatchCommand(sender, new ArgumentBuffer(command));
+    }
+
+    @Override
+    public boolean dispatchCommand(CommandSender sender, String usedLabel, String[] args) {
+        return dispatchCommand(sender, new ArgumentBuffer(usedLabel, args));
+    }
+
+    @Override
+    public boolean dispatchCommand(CommandSender sender, ArgumentBuffer buffer) {
+        ModifiableCommandAddress targetAddress = getCommandTarget(sender, buffer);
+        Command target = targetAddress.getCommand();
+
+        if (target == null) {
+            if (targetAddress.hasHelpCommand()) {
+                target = targetAddress.getHelpCommand().getCommand();
+            } else {
+                return false;
+            }
+        }
+
+        target.execute(sender, targetAddress, buffer);
+        return true;
+    }
+
+    @Override
+    public List<String> getTabCompletions(CommandSender sender, Location location, String[] args) {
+        return getTabCompletions(sender, location, new ArgumentBuffer(args));
+    }
+
+    @Override
+    public List<String> getTabCompletions(CommandSender sender, String usedLabel, Location location, String[] args) {
+        return getTabCompletions(sender, location, new ArgumentBuffer(usedLabel, args));
+    }
+
+    @Override
+    public List<String> getTabCompletions(CommandSender sender, Location location, ArgumentBuffer buffer) {
+        ICommandAddress target = getCommandTarget(sender, buffer);
+        List<String> out = target.hasCommand() ? target.getCommand().tabComplete(sender, target, location, buffer.getUnaffectingCopy()) : Collections.emptyList();
+
+        int cursor = buffer.getCursor();
+        String input;
+        if (cursor >= buffer.size()) {
+            input = "";
+        } else {
+            input = buffer.get(cursor).toLowerCase();
+        }
+
+        boolean wrapped = false;
+        for (String child : target.getChildren().keySet()) {
+            if (child.toLowerCase().startsWith(input)) {
+                if (!wrapped) {
+                    out = new ArrayList<>(out);
+                    wrapped = true;
+                }
+                out.add(child);
+            }
+        }
+
+        return out;
+    }
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/Validate.java b/dicore3/command/src/main/java/io/dico/dicore/command/Validate.java
new file mode 100644
index 0000000..596ad08
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/Validate.java
@@ -0,0 +1,52 @@
+package io.dico.dicore.command;
+
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.ConsoleCommandSender;
+import org.bukkit.entity.Player;
+
+import java.util.Optional;
+
+public class Validate {
+
+    private Validate() {
+
+    }
+
+    //@Contract("false, _ -> fail")
+    public static void isTrue(boolean expression, String failMessage) throws CommandException {
+        if (!expression) {
+            throw new CommandException(failMessage);
+        }
+    }
+
+    //@Contract("null, _ -> fail")
+    public static void notNull(Object obj, String failMessage) throws CommandException {
+        Validate.isTrue(obj != null, failMessage);
+    }
+
+    public static void isAuthorized(CommandSender sender, String permission, String failMessage) throws CommandException {
+        Validate.isTrue(sender.hasPermission(permission), failMessage);
+    }
+
+    public static void isAuthorized(CommandSender sender, String permission) throws CommandException {
+        Validate.isAuthorized(sender, permission, "You do not have permission to use that command");
+    }
+
+    //@Contract("null -> fail")
+    public static void isPlayer(CommandSender sender) throws CommandException {
+        isTrue(sender instanceof Player, "That command can only be used by players");
+    }
+
+    //@Contract("null -> fail")
+    public static void isConsole(CommandSender sender) throws CommandException {
+        isTrue(sender instanceof ConsoleCommandSender, "That command can only be used by the console");
+    }
+
+    public static <T> T returnIfPresent(Optional<T> maybe, String failMessage) throws CommandException {
+        if (!maybe.isPresent()) {
+            throw new CommandException(failMessage);
+        }
+        return maybe.get();
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/BigRange.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/BigRange.java
new file mode 100644
index 0000000..467ba4b
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/BigRange.java
@@ -0,0 +1,52 @@
+package io.dico.dicore.command.annotation;
+
+import io.dico.dicore.command.parameter.type.ParameterConfig;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.PARAMETER)
+public @interface BigRange {
+    Class<?> MEMORY_CLASS = Memory.class;
+    ParameterConfig<BigRange, Memory> CONFIG = ParameterConfig.getMemoryClassFromField(BigRange.class);
+    Memory DEFAULT = new Memory("MIN", "MAX", "0");
+
+    String min() default "MIN";
+
+    String max() default "MAX";
+
+    String defaultValue() default "0";
+
+    class Memory {
+        private final String min;
+        private final String max;
+        private final String defaultValue;
+
+        public Memory(BigRange range) {
+            this(range.min(), range.max(), range.defaultValue());
+        }
+
+        public Memory(String min, String max, String defaultValue) {
+            this.min = min;
+            this.max = max;
+            this.defaultValue = defaultValue;
+        }
+
+        public String min() {
+            return min;
+        }
+
+        public String max() {
+            return max;
+        }
+
+        public String defaultValue() {
+            return defaultValue;
+        }
+
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Cmd.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Cmd.java
new file mode 100644
index 0000000..109490a
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Cmd.java
@@ -0,0 +1,16 @@
+package io.dico.dicore.command.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface Cmd {
+
+    String value();
+
+    String[] aliases() default {};
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/CmdParamType.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/CmdParamType.java
new file mode 100644
index 0000000..ea51e44
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/CmdParamType.java
@@ -0,0 +1,27 @@
+package io.dico.dicore.command.annotation;
+
+import io.dico.dicore.command.parameter.type.IParameterTypeSelector;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation to mark methods that register a parameter type to the localized selector for use in reflective commands.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface CmdParamType {
+
+    /**
+     * If this flag is set, the type is registered without its annotation type.
+     * As a result, the {@link IParameterTypeSelector} is more likely to select it (faster).
+     * This is irrelevant if there is no annotation type or param config.
+     *
+     * @return true if this parameter type should be registered without its annotation type too
+     */
+    boolean infolessAlias() default false;
+
+}
+
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/CommandAnnotationUtils.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/CommandAnnotationUtils.java
new file mode 100644
index 0000000..868884c
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/CommandAnnotationUtils.java
@@ -0,0 +1,35 @@
+package io.dico.dicore.command.annotation;
+
+public class CommandAnnotationUtils {
+
+    /**
+     * Get the short description from a {@link Desc} annotation.
+     * If {@link Desc#shortVersion()} is given, returns that.
+     * Otherwise, returns the first element of {@link Desc#value()}
+     * If neither is available, returns null.
+     *
+     * @param desc the annotation
+     * @return the short description
+     */
+    public static String getShortDescription(Desc desc) {
+        String descString;
+        if (desc == null) {
+            descString = null;
+        } else if (!desc.shortVersion().isEmpty()) {
+            descString = desc.shortVersion();
+        } else if (desc.value().length > 0) {
+            descString = desc.value()[0];
+            if (desc.value().length > 1) {
+                //System.out.println("[Command Warning] Multiline descriptions not supported here. Keep it short for: " + targetIdentifier);
+            }
+            if (descString != null && descString.isEmpty()) {
+                descString = null;
+            }
+        } else {
+            descString = null;
+        }
+
+        return descString;
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Desc.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Desc.java
new file mode 100644
index 0000000..0011fb8
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Desc.java
@@ -0,0 +1,27 @@
+package io.dico.dicore.command.annotation;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Desc {
+
+    /**
+     * Multiline description if {@link #shortVersion} is set.
+     * Otherwise, this should be an array with one element (aka, you don't have to add array brackets).
+     *
+     * @return the multiline description.
+     * @see CommandAnnotationUtils#getShortDescription(Desc)
+     */
+    String[] value();
+
+    /**
+     * Short description, use if {@link #value} is multi-line.
+     * To get a short description from a {@link Desc}, you should use {@link CommandAnnotationUtils#getShortDescription(Desc)}
+     *
+     * @return short description
+     * @see CommandAnnotationUtils#getShortDescription(Desc)
+     */
+    String shortVersion() default "";
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Flag.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Flag.java
new file mode 100644
index 0000000..31a47dd
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Flag.java
@@ -0,0 +1,16 @@
+package io.dico.dicore.command.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.PARAMETER)
+public @interface Flag {
+
+    String value() default "";
+
+    String permission() default "";
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/GenerateCommands.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/GenerateCommands.java
new file mode 100644
index 0000000..9b7164d
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/GenerateCommands.java
@@ -0,0 +1,14 @@
+package io.dico.dicore.command.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface GenerateCommands {
+
+    String[] value() default {"help"};
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/GroupMatchedCommands.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/GroupMatchedCommands.java
new file mode 100644
index 0000000..53e3e9e
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/GroupMatchedCommands.java
@@ -0,0 +1,68 @@
+package io.dico.dicore.command.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Annotation to define sub-groups of the group registered reflectively from all methods in a class.
+ * <p>
+ * Commands are selected for grouping by matching their method's names to a regular expression.
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface GroupMatchedCommands {
+
+    @Retention(RetentionPolicy.RUNTIME)
+    @interface GroupEntry {
+
+        /**
+         * Regular expression to match method names for this group
+         * Must be non-empty
+         *
+         * @return the regular expression
+         */
+        String regex();
+
+        /**
+         * The name or main key of the sub-group or address
+         * Must be non-empty
+         *
+         * @return the group name
+         */
+        String group();
+
+        /**
+         * The aliases for the sub-group
+         *
+         * @return the group aliases
+         */
+        String[] groupAliases() default {};
+
+        /**
+         * Generated (predefined) commands for the sub-group
+         */
+        String[] generatedCommands() default {};
+
+        /**
+         * @see Desc
+         */
+        String[] description() default {};
+
+        /**
+         * @see Desc
+         */
+        String shortDescription() default "";
+    }
+
+    /**
+     * The defined groups.
+     * If a method name matches the regex of multiple groups,
+     * groups are prioritized by the order in which they appear in this array.
+     *
+     * @return the defined groups
+     */
+    GroupEntry[] value();
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/NamedArg.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/NamedArg.java
new file mode 100644
index 0000000..fa42e6b
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/NamedArg.java
@@ -0,0 +1,14 @@
+package io.dico.dicore.command.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.PARAMETER)
+public @interface NamedArg {
+
+    String value();
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/PreprocessArgs.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/PreprocessArgs.java
new file mode 100644
index 0000000..40d6d73
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/PreprocessArgs.java
@@ -0,0 +1,16 @@
+package io.dico.dicore.command.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface PreprocessArgs {
+
+    String tokens() default "\"\"";
+
+    char escapeChar() default '\\';
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Range.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Range.java
new file mode 100644
index 0000000..3fd4160
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/Range.java
@@ -0,0 +1,67 @@
+package io.dico.dicore.command.annotation;
+
+import io.dico.dicore.command.CommandException;
+import io.dico.dicore.command.Validate;
+import io.dico.dicore.command.parameter.type.ParameterConfig;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.PARAMETER)
+public @interface Range {
+    Class<?> MEMORY_CLASS = Memory.class;
+    ParameterConfig<Range, Memory> CONFIG = ParameterConfig.getMemoryClassFromField(Range.class);
+    Memory DEFAULT = new Memory(-Double.MAX_VALUE, Double.MAX_VALUE, 0);
+
+    double min() default -Double.MAX_VALUE;
+
+    double max() default Double.MAX_VALUE;
+
+    double defaultValue() default 0;
+
+    class Memory {
+        private final double min;
+        private final double max;
+        private final double defaultValue;
+
+        public Memory(Range range) {
+            this(range.min(), range.max(), range.defaultValue());
+        }
+
+        public Memory(double min, double max, double defaultValue) {
+            this.min = min;
+            this.max = max;
+            this.defaultValue = defaultValue;
+        }
+
+        public double min() {
+            return min;
+        }
+
+        public double max() {
+            return max;
+        }
+
+        public double defaultValue() {
+            return defaultValue;
+        }
+
+        public void validate(Number x, String failMessage) throws CommandException {
+            Validate.isTrue(valid(x), failMessage);
+        }
+
+        public boolean valid(Number x) {
+            double d = x.doubleValue();
+            return min <= d && d <= max;
+        }
+
+        public boolean isDefault() {
+            return this == DEFAULT || (min == DEFAULT.min && max == DEFAULT.max && defaultValue == DEFAULT.defaultValue);
+        }
+
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequireConsole.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequireConsole.java
new file mode 100644
index 0000000..362f05c
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequireConsole.java
@@ -0,0 +1,11 @@
+package io.dico.dicore.command.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface RequireConsole {
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequireParameters.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequireParameters.java
new file mode 100644
index 0000000..02f5548
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequireParameters.java
@@ -0,0 +1,14 @@
+package io.dico.dicore.command.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface RequireParameters {
+
+    int value();
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequirePermissions.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequirePermissions.java
new file mode 100644
index 0000000..0fbe9a4
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequirePermissions.java
@@ -0,0 +1,30 @@
+package io.dico.dicore.command.annotation;
+
+import io.dico.dicore.command.IContextFilter;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface RequirePermissions {
+
+    /**
+     * Any permissions that must be present on the sender
+     *
+     * @return an array of permission nodes
+     */
+    String[] value();
+
+    /**
+     * Whether permissions should (also) be inherited from the parent.
+     * This uses {@link IContextFilter#INHERIT_PERMISSIONS}
+     * This is true by default.
+     *
+     * @return true if permissions should be inherited.
+     */
+    boolean inherit() default true;
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequirePlayer.java b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequirePlayer.java
new file mode 100644
index 0000000..2165e05
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/annotation/RequirePlayer.java
@@ -0,0 +1,11 @@
+package io.dico.dicore.command.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface RequirePlayer {
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/AbstractChatController.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/AbstractChatController.java
new file mode 100644
index 0000000..7d88d0e
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/AbstractChatController.java
@@ -0,0 +1,86 @@
+package io.dico.dicore.command.chat;
+
+import io.dico.dicore.command.CommandException;
+import io.dico.dicore.command.EMessageType;
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import org.bukkit.command.CommandSender;
+
+public class AbstractChatController implements IChatController {
+
+    @Override
+    public void sendMessage(ExecutionContext context, EMessageType type, String message) {
+        sendMessage(context.getSender(), type, message);
+    }
+
+    @Override
+    public void sendMessage(CommandSender sender, EMessageType type, String message) {
+        if (message != null && !message.isEmpty()) {
+            sender.sendMessage(getMessagePrefixForType(type) + getChatFormatForType(type) + message);
+        }
+    }
+
+    @Override
+    public void handleCommandException(CommandSender sender, ExecutionContext context, CommandException exception) {
+        sendMessage(sender, EMessageType.EXCEPTION, exception.getMessage());
+    }
+
+    @Override
+    public void handleException(CommandSender sender, ExecutionContext context, Throwable exception) {
+        if (exception instanceof CommandException) {
+            handleCommandException(sender, context, (CommandException) exception);
+        } else {
+            sendMessage(sender, EMessageType.EXCEPTION, "An internal error occurred whilst executing this command");
+            exception.printStackTrace();
+        }
+    }
+
+    @Override
+    public void sendHelpMessage(CommandSender sender, ExecutionContext context, ICommandAddress address, int page) {
+        sendMessage(sender, EMessageType.INSTRUCTION, HelpCache.getHelpCache(address).getHelpPage(page));
+    }
+
+    @Override
+    public void sendSyntaxMessage(CommandSender sender, ExecutionContext context, ICommandAddress address) {
+        sendMessage(sender, EMessageType.INSTRUCTION, HelpCache.getHelpCache(address).getSyntax());
+    }
+
+    @Override
+    public Formatting getChatFormatForType(EMessageType type) {
+        switch (type) {
+            case EXCEPTION:
+            case BAD_NEWS:
+                return Formatting.RED;
+            case INSTRUCTION:
+            case NEUTRAL:
+                return Formatting.GRAY;
+            case CUSTOM:
+                return Formatting.WHITE;
+            case INFORMATIVE:
+                return Formatting.AQUA;
+            case RESULT:
+            default:
+            case GOOD_NEWS:
+                return Formatting.GREEN;
+            case WARNING:
+                return Formatting.YELLOW;
+
+            case DESCRIPTION:
+                return Formatting.GREEN;
+            case SYNTAX:
+                return Formatting.BLUE;
+            case HIGHLIGHT:
+                return Formatting.RED;
+            case SUBCOMMAND:
+                return Formatting.GRAY;
+            case NUMBER:
+                return Formatting.YELLOW;
+        }
+    }
+
+    @Override
+    public String getMessagePrefixForType(EMessageType type) {
+        return "";
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/ChatControllers.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/ChatControllers.java
new file mode 100644
index 0000000..709f791
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/ChatControllers.java
@@ -0,0 +1,52 @@
+package io.dico.dicore.command.chat;
+
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.chat.help.IHelpComponent;
+import io.dico.dicore.command.chat.help.IHelpTopic;
+import io.dico.dicore.command.chat.help.IPageBuilder;
+import io.dico.dicore.command.chat.help.IPageLayout;
+import io.dico.dicore.command.chat.help.defaults.*;
+import org.bukkit.command.CommandSender;
+
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Static factory methods for {@link IChatController}
+ */
+public class ChatControllers {
+    private static final IChatController defaultChat;
+
+    private ChatControllers() {
+
+    }
+
+    public static IChatController defaultChat() {
+        return defaultChat;
+    }
+
+    static {
+        defaultChat = new AbstractChatController() {
+            IPageBuilder pageBuilder = new DefaultPageBuilder();
+            IPageLayout pageLayout = new DefaultPageLayout();
+            List<IHelpTopic> topics = Arrays.asList(new DescriptionHelpTopic(), new SyntaxHelpTopic(), new SubcommandsHelpTopic());
+
+            @Override
+            public void sendHelpMessage(CommandSender sender, ExecutionContext context, ICommandAddress address, int page) {
+                sender.sendMessage(pageBuilder.getPage(topics, pageLayout, address, sender, context, page, 12));
+            }
+
+            @Override
+            public void sendSyntaxMessage(CommandSender sender, ExecutionContext context, ICommandAddress address) {
+                List<IHelpComponent> components = topics.get(1).getComponents(address, sender, context);
+                if (components.isEmpty()) {
+                    sendHelpMessage(sender, context, address, 1);
+                } else {
+                    sender.sendMessage(DefaultPageBuilder.combine(components));
+                }
+            }
+
+        };
+    }
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/Formatting.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/Formatting.java
new file mode 100644
index 0000000..576dfb5
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/Formatting.java
@@ -0,0 +1,278 @@
+package io.dico.dicore.command.chat;
+
+import gnu.trove.map.TCharObjectMap;
+import gnu.trove.map.hash.TCharObjectHashMap;
+
+public final class Formatting implements CharSequence {
+    public static final char FORMAT_CHAR = '\u00a7';
+    private static final TCharObjectMap<Formatting> singleCharInstances = new TCharObjectHashMap<>(16, .5F, '\0');
+
+    public static final Formatting
+            BLACK = from('0'),
+            DARK_BLUE = from('1'),
+            DARL_GREEN = from('2'),
+            CYAN = from('3'),
+            DARK_RED = from('4'),
+            PURPLE = from('5'),
+            ORANGE = from('6'),
+            GRAY = from('7'),
+            DARK_GRAY = from('8'),
+            BLUE = from('9'),
+            GREEN = from('a'),
+            AQUA = from('b'),
+            RED = from('c'),
+            PINK = from('d'),
+            YELLOW = from('e'),
+            WHITE = from('f'),
+            BOLD = from('l'),
+            STRIKETHROUGH = from('m'),
+            UNDERLINE = from('n'),
+            ITALIC = from('o'),
+            MAGIC = from('k'),
+            RESET = from('r'),
+            EMPTY = from('\0');
+
+    public static String stripAll(String value) {
+        return stripAll(FORMAT_CHAR, value);
+    }
+
+    public static String stripAll(char alternateChar, String value) {
+        int index = value.indexOf(alternateChar);
+        int max;
+        if (index == -1 || index == (max = value.length() - 1)) {
+            return value;
+        }
+
+        StringBuilder result = new StringBuilder();
+        int from = 0;
+        do {
+            if (isRecognizedChar(value.charAt(index + 1))) {
+                result.append(value, from, index);
+                from = index + 2;
+            } else {
+                result.append(value, from, from = index + 2);
+            }
+
+            index = value.indexOf(alternateChar, index + 1);
+        } while (index != -1 && index != max && from <= max);
+
+        if (from <= max) {
+            result.append(value, from, value.length());
+        }
+        return result.toString();
+    }
+
+    public static String stripFirst(String value) {
+        return stripFirst(FORMAT_CHAR, value);
+    }
+
+    public static String stripFirst(char alternateChar, String value) {
+        int index = value.indexOf(alternateChar);
+        int max;
+        if (index == -1 || index == (max = value.length() - 1)) {
+            return value;
+        }
+
+        StringBuilder result = new StringBuilder(value.length());
+        int from = 0;
+        if (isRecognizedChar(value.charAt(index + 1))) {
+            result.append(value, from, index);
+            from = index + 2;
+        } else {
+            result.append(value, from, from = index + 2);
+        }
+
+        if (from < max) {
+            result.append(value, from, value.length());
+        }
+        return result.toString();
+    }
+
+    public static Formatting from(char c) {
+        if (isRecognizedChar(c)) {
+            c = Character.toLowerCase(c);
+            Formatting res = singleCharInstances.get(c);
+            if (res == null) {
+                singleCharInstances.put(c, res = new Formatting(c));
+            }
+            return res;
+        }
+        return EMPTY;
+    }
+
+    public static Formatting from(String chars) {
+        return chars.length() == 1 ? from(chars.charAt(0)) : getFormats(chars, '\0');
+    }
+
+    public static Formatting getFormats(String input) {
+        return getFormats(input, FORMAT_CHAR);
+    }
+
+    public static Formatting getFormats(String input, char formatChar) {
+        return getFormats(input, 0, input.length(), formatChar);
+    }
+
+    public static Formatting getFormats(String input, int start, int end, char formatChar) {
+        if ((start < 0) || (start > end) || (end > input.length())) {
+            throw new IndexOutOfBoundsException("start " + start + ", end " + end + ", input.length() " + input.length());
+        }
+
+        boolean needsFormatChar = formatChar != '\0';
+        char[] formats = new char[6];
+        // just make sure it's not the same as formatChar
+        char previous = (char) (formatChar + 1);
+
+        for (int i = start; i < end; i++) {
+            char c = input.charAt(i);
+
+            if (previous == formatChar || !needsFormatChar) {
+                if (isColourChar(c) || isResetChar(c)) {
+                    formats = new char[6];
+                    formats[0] = Character.toLowerCase(c);
+                } else if (isFormatChar(c)) {
+                    char format = Character.toLowerCase(c);
+                    for (int j = 0; j < 6; j++) {
+                        if (formats[j] == '\0') {
+                            formats[j] = format;
+                            break;
+                        } else if (formats[j] == format) {
+                            break;
+                        }
+                    }
+                }
+            }
+
+            previous = c;
+        }
+
+        return formats[1] == '\0' ? from(formats[0]) : new Formatting(formats);
+    }
+
+    public static String translate(String input) {
+        return translateChars('&', input);
+    }
+
+    public static String translateChars(char alternateChar, String input) {
+        return translateFormat(alternateChar, FORMAT_CHAR, input);
+    }
+
+    public static String revert(String input) {
+        return revertChars('&', input);
+    }
+
+    public static String revertChars(char alternateChar, String input) {
+        return translateFormat(FORMAT_CHAR, alternateChar, input);
+    }
+
+    public static String translateFormat(char fromChar, char toChar, String input) {
+        if (input == null) {
+            return null;
+        }
+        int n = input.length();
+        if (n < 2) {
+            return input;
+        }
+        char[] result = null;
+        char previous = input.charAt(0);
+        for (int i = 1; i < n; i++) {
+            char c = input.charAt(i);
+            if (previous == fromChar && isRecognizedChar(c)) {
+                if (result == null) {
+                    result = input.toCharArray();
+                }
+                result[i - 1] = toChar;
+            }
+            previous = c;
+        }
+        return result == null ? input : String.valueOf(result);
+    }
+
+    public static void translate(StringBuilder input) {
+        translateChars('&', input);
+    }
+
+    public static void translateChars(char alternateChar, StringBuilder input) {
+        translateFormat(alternateChar, FORMAT_CHAR, input);
+    }
+
+    public static void revert(StringBuilder input) {
+        revertChars('&', input);
+    }
+
+    public static void revertChars(char alternateChar, StringBuilder input) {
+        translateFormat(FORMAT_CHAR, alternateChar, input);
+    }
+
+    public static void translateFormat(char fromChar, char toChar, StringBuilder input) {
+        if (input == null) {
+            return;
+        }
+        int n = input.length();
+        if (n < 2) {
+            return;
+        }
+        char previous = input.charAt(0);
+        for (int i = 1; i < n; i++) {
+            char c = input.charAt(i);
+            if (previous == fromChar && isRecognizedChar(c)) {
+                input.setCharAt(i - 1, toChar);
+            }
+            previous = c;
+        }
+    }
+
+    private static boolean isRecognizedChar(char c) {
+        return isColourChar(c) || isFormatChar(c) || isResetChar(c);
+    }
+
+    private static boolean isColourChar(char c) {
+        return "0123456789abcdefABCDEF".indexOf(c) > -1;
+    }
+
+    private static boolean isResetChar(char c) {
+        return c == 'r' || c == 'R';
+    }
+
+    private static boolean isFormatChar(char c) {
+        return "lmnokLMNOK".indexOf(c) > -1;
+    }
+
+    private final String format;
+
+    private Formatting(char[] formats) {
+        StringBuilder format = new StringBuilder(12);
+        for (char c : formats) {
+            if (c != '\0') {
+                format.append(FORMAT_CHAR).append(c);
+            } else {
+                break;
+            }
+        }
+        this.format = format.toString();
+    }
+
+    private Formatting(char c) {
+        this.format = (c != '\0') ? String.valueOf(new char[]{FORMAT_CHAR, c}) : "";
+    }
+
+    @Override
+    public int length() {
+        return format.length();
+    }
+
+    @Override
+    public char charAt(int index) {
+        return format.charAt(index);
+    }
+
+    @Override
+    public String subSequence(int start, int end) {
+        return format.substring(start, end);
+    }
+
+    @Override
+    public String toString() {
+        return format;
+    }
+
+}
\ No newline at end of file
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/HelpCache.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/HelpCache.java
new file mode 100644
index 0000000..ed91d69
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/HelpCache.java
@@ -0,0 +1,186 @@
+package io.dico.dicore.command.chat;
+
+import io.dico.dicore.command.Command;
+import io.dico.dicore.command.EMessageType;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.parameter.Parameter;
+import io.dico.dicore.command.parameter.ParameterList;
+
+import java.util.*;
+import java.util.stream.Collectors;
+
+public class HelpCache {
+    private static Map<ICommandAddress, HelpCache> caches = new IdentityHashMap<>();
+    private ICommandAddress address;
+    private String shortSyntax;
+    private String[] lines;
+    private int[] pageStarts;
+
+    public static HelpCache getHelpCache(ICommandAddress address) {
+        return caches.computeIfAbsent(address, HelpCache::new);
+    }
+
+    private HelpCache(ICommandAddress address) {
+        this.address = address;
+    }
+
+    private void loadHelp() {
+        List<String> lines = new ArrayList<>();
+        List<Integer> potentialPageStarts = new ArrayList<>();
+        int curLineIdx = 0;
+        potentialPageStarts.add(curLineIdx);
+
+        String curLine = address.getChatController().getMessagePrefixForType(EMessageType.INSTRUCTION);
+        curLine += address.getChatController().getChatFormatForType(EMessageType.INSTRUCTION);
+        curLine += getSyntax();
+        lines.add(curLine);
+        curLineIdx++;
+
+        if (address.hasCommand()) {
+            Command command = address.getCommand();
+            String[] description = command.getDescription();
+            if (description != null && description.length > 0) {
+                for (String line : description) {
+                    curLine = address.getChatController().getChatFormatForType(EMessageType.INFORMATIVE).toString();
+                    curLine += line;
+                    lines.add(curLine);
+                    curLineIdx++;
+                }
+            }
+        }
+
+        List<ICommandAddress> children = address.getChildren().values().stream()
+                .distinct()
+                .sorted(Comparator.comparing(ICommandAddress::getMainKey))
+                .collect(Collectors.toList());
+
+        for (ICommandAddress address : children) {
+            potentialPageStarts.add(curLineIdx);
+
+            curLine = this.address.getChatController().getChatFormatForType(EMessageType.INSTRUCTION) + "/";
+            if (address.isDepthLargerThan(2)) {
+                curLine += "... ";
+            }
+            curLine += address.getMainKey();
+            curLine += getHelpCache(address).getShortSyntax();
+            lines.add(curLine);
+            curLineIdx++;
+
+            if (address.hasCommand()) {
+                String shortDescription = address.getCommand().getShortDescription();
+                if (shortDescription != null) {
+                    curLine = this.address.getChatController().getChatFormatForType(EMessageType.INFORMATIVE).toString();
+                    curLine += shortDescription;
+                    lines.add(curLine);
+                    curLineIdx++;
+                }
+            }
+        }
+
+        this.lines = lines.toArray(new String[lines.size()]);
+
+        // compute where the pages start with a maximum page size of 10
+        List<Integer> pageStarts = new ArrayList<>();
+        pageStarts.add(0);
+        int maxLength = 10;
+        int curPageEndTarget = maxLength;
+        for (int i = 1, n = potentialPageStarts.size(); i < n; i++) {
+            int index = potentialPageStarts.get(i);
+            if (index == curPageEndTarget) {
+                pageStarts.add(curPageEndTarget);
+                curPageEndTarget += maxLength;
+            } else if (index > curPageEndTarget) {
+                curPageEndTarget = potentialPageStarts.get(i - 1);
+                pageStarts.add(curPageEndTarget);
+                curPageEndTarget += maxLength;
+            }
+        }
+
+        int[] pageStartsArray = new int[pageStarts.size()];
+        for (int i = 0, n = pageStartsArray.length; i < n; i++) {
+            pageStartsArray[i] = pageStarts.get(i);
+        }
+        this.pageStarts = pageStartsArray;
+    }
+
+    /**
+     * Get a help page
+     *
+     * @param page the 0-bound page number (first page is page 0)
+     * @return the help page
+     */
+    public String getHelpPage(int page) {
+        if (lines == null) {
+            loadHelp();
+        }
+
+        //System.out.println(Arrays.toString(lines));
+
+        if (page >= pageStarts.length) {
+            //System.out.println("page >= pageStarts.length: " + Arrays.toString(pageStarts));
+            return "";
+        } else if (page < 0) {
+            throw new IllegalArgumentException("Page number is negative");
+        }
+
+        int start = pageStarts[page];
+        int end = page + 1 == pageStarts.length ? lines.length : pageStarts[page + 1];
+        //System.out.println("start = " + start);
+        //System.out.println("end = " + end);
+        return String.join("\n", Arrays.copyOfRange(lines, start, end));
+    }
+
+    public int getTotalPageCount() {
+        return pageStarts.length;
+    }
+
+    /**
+     * The latter syntax of the command, prefixed by a space.
+     *
+     * @return The latter part of the syntax for this command. That is, without the actual command name.
+     */
+    public String getShortSyntax() {
+        if (shortSyntax != null) {
+            return shortSyntax;
+        }
+
+        StringBuilder syntax = new StringBuilder();
+        if (address.hasCommand()) {
+            Command command = address.getCommand();
+            ParameterList list = command.getParameterList();
+            Parameter<?, ?> repeated = list.getRepeatedParameter();
+
+            int requiredCount = list.getRequiredCount();
+            List<Parameter<?, ?>> indexedParameters = list.getIndexedParameters();
+            for (int i = 0, n = indexedParameters.size(); i < n; i++) {
+                syntax.append(i < requiredCount ? " <" : " [");
+                Parameter<?, ?> param = indexedParameters.get(i);
+                syntax.append(param.getName());
+                if (param == repeated) {
+                    syntax.append("...");
+                }
+                syntax.append(i < requiredCount ? '>' : ']');
+            }
+
+            Map<String, Parameter<?, ?>> parametersByName = list.getParametersByName();
+            for (Parameter<?, ?> param : parametersByName.values()) {
+                if (param.isFlag()) {
+                    syntax.append(" [").append(param.getName());
+                    if (param.expectsInput()) {
+                        syntax.append(" <>");
+                    }
+                    syntax.append(']');
+                }
+            }
+        } else {
+            syntax.append(' ');
+        }
+        this.shortSyntax = syntax.toString();
+        return this.shortSyntax;
+    }
+
+    public String getSyntax() {
+        return '/' + address.getAddress() + getShortSyntax();
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/IChatController.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/IChatController.java
new file mode 100644
index 0000000..79a3d48
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/IChatController.java
@@ -0,0 +1,28 @@
+package io.dico.dicore.command.chat;
+
+import io.dico.dicore.command.CommandException;
+import io.dico.dicore.command.EMessageType;
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import org.bukkit.command.CommandSender;
+
+//TODO add methods to send JSON messages
+public interface IChatController {
+
+    void sendMessage(ExecutionContext context, EMessageType type, String message);
+
+    void sendMessage(CommandSender sender, EMessageType type, String message);
+
+    void handleCommandException(CommandSender sender, ExecutionContext context, CommandException exception);
+
+    void handleException(CommandSender sender, ExecutionContext context, Throwable exception);
+
+    void sendHelpMessage(CommandSender sender, ExecutionContext context, ICommandAddress address, int page);
+
+    void sendSyntaxMessage(CommandSender sender, ExecutionContext context, ICommandAddress address);
+
+    Formatting getChatFormatForType(EMessageType type);
+
+    String getMessagePrefixForType(EMessageType type);
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/HelpTopicModifier.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/HelpTopicModifier.java
new file mode 100644
index 0000000..a44822b
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/HelpTopicModifier.java
@@ -0,0 +1,24 @@
+package io.dico.dicore.command.chat.help;
+
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import org.bukkit.permissions.Permissible;
+
+import java.util.List;
+import java.util.Objects;
+
+public abstract class HelpTopicModifier implements IHelpTopic {
+    private final IHelpTopic delegate;
+
+    public HelpTopicModifier(IHelpTopic delegate) {
+        this.delegate = Objects.requireNonNull(delegate);
+    }
+
+    @Override
+    public List<IHelpComponent> getComponents(ICommandAddress target, Permissible viewer, ExecutionContext context) {
+        return modify(delegate.getComponents(target, viewer, context), target, viewer, context);
+    }
+
+    protected abstract List<IHelpComponent> modify(List<IHelpComponent> components, ICommandAddress target, Permissible viewer, ExecutionContext context);
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IHelpComponent.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IHelpComponent.java
new file mode 100644
index 0000000..e1867b5
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IHelpComponent.java
@@ -0,0 +1,9 @@
+package io.dico.dicore.command.chat.help;
+
+public interface IHelpComponent {
+
+    int lineCount();
+
+    void appendTo(StringBuilder sb);
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IHelpTopic.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IHelpTopic.java
new file mode 100644
index 0000000..618109e
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IHelpTopic.java
@@ -0,0 +1,22 @@
+package io.dico.dicore.command.chat.help;
+
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import org.bukkit.permissions.Permissible;
+
+import java.util.List;
+
+public interface IHelpTopic {
+
+    /**
+     * Get the components of this help topic
+     *
+     * @param target  The address of the command to provide help about
+     * @param viewer  The permissible that the page will be shown to (null -> choose a default set).
+     * @param context Context of the command execution
+     * @return a mutable list of components to include in the help pages
+     */
+    List<IHelpComponent> getComponents(ICommandAddress target, Permissible viewer, ExecutionContext context);
+
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IPageBorder.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IPageBorder.java
new file mode 100644
index 0000000..1ae3561
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IPageBorder.java
@@ -0,0 +1,7 @@
+package io.dico.dicore.command.chat.help;
+
+public interface IPageBorder extends IHelpComponent {
+
+    void setPageCount(int pageCount);
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IPageBuilder.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IPageBuilder.java
new file mode 100644
index 0000000..86d9450
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IPageBuilder.java
@@ -0,0 +1,13 @@
+package io.dico.dicore.command.chat.help;
+
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import org.bukkit.permissions.Permissible;
+
+import java.util.List;
+
+public interface IPageBuilder {
+
+    String getPage(List<IHelpTopic> helpTopics, IPageLayout pageLayout, ICommandAddress target, Permissible viewer, ExecutionContext context, int pageNum, int pageLen);
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IPageLayout.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IPageLayout.java
new file mode 100644
index 0000000..3223e32
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/IPageLayout.java
@@ -0,0 +1,20 @@
+package io.dico.dicore.command.chat.help;
+
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import org.bukkit.permissions.Permissible;
+
+public interface IPageLayout {
+
+    /**
+     * Get the page borders for a help page
+     *
+     * @param target  the address that help is displayed for
+     * @param viewer  the viewer of the help page, or null if irrelevant
+     * @param context the context of the execution
+     * @param pageNum the page number as displayed in the help page (so it's 1-bound and not 0-bound)
+     * @return the page borders.
+     */
+    PageBorders getPageBorders(ICommandAddress target, Permissible viewer, ExecutionContext context, int pageNum);
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/PageBorders.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/PageBorders.java
new file mode 100644
index 0000000..43c0514
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/PageBorders.java
@@ -0,0 +1,76 @@
+package io.dico.dicore.command.chat.help;
+
+import java.util.Arrays;
+
+public class PageBorders {
+    private final IPageBorder header, footer;
+
+    public PageBorders(IPageBorder header, IPageBorder footer) {
+        this.header = header;
+        this.footer = footer;
+    }
+
+    public IPageBorder getHeader() {
+        return header;
+    }
+
+    public IPageBorder getFooter() {
+        return footer;
+    }
+
+    public static IPageBorder simpleBorder(String... lines) {
+        return new SimplePageBorder(lines);
+    }
+
+    public static IPageBorder disappearingBorder(int pageNum, String... lines) {
+        return disappearingBorder(pageNum, 0, lines);
+    }
+
+    public static IPageBorder disappearingBorder(int pageNum, int keptLines, String... lines) {
+        return new DisappearingPageBorder(pageNum, keptLines, lines);
+    }
+
+    static class SimplePageBorder extends SimpleHelpComponent implements IPageBorder {
+        private final String replacedSequence;
+
+        public SimplePageBorder(String replacedSequence, String... lines) {
+            super(lines);
+            this.replacedSequence = replacedSequence;
+        }
+
+        public SimplePageBorder(String... lines) {
+            super(lines);
+            this.replacedSequence = "%pageCount%";
+        }
+
+        @Override
+        public void setPageCount(int pageCount) {
+            String[] lines = this.lines;
+            for (int i = 0; i < lines.length; i++) {
+                lines[i] = lines[i].replace(replacedSequence, Integer.toString(pageCount));
+            }
+        }
+
+    }
+
+    static class DisappearingPageBorder extends SimpleHelpComponent implements IPageBorder {
+        private final int pageNum;
+        private final int keptLines;
+
+        public DisappearingPageBorder(int pageNum, int keptLines, String... lines) {
+            super(lines);
+            this.pageNum = pageNum;
+            this.keptLines = keptLines;
+        }
+
+        @Override
+        public void setPageCount(int pageCount) {
+            if (pageCount == pageNum) {
+                String[] lines = this.lines;
+                this.lines = Arrays.copyOfRange(lines, Math.max(0, lines.length - keptLines), lines.length);
+            }
+        }
+
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/SimpleHelpComponent.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/SimpleHelpComponent.java
new file mode 100644
index 0000000..22707fd
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/SimpleHelpComponent.java
@@ -0,0 +1,27 @@
+package io.dico.dicore.command.chat.help;
+
+public class SimpleHelpComponent implements IHelpComponent {
+    String[] lines;
+
+    public SimpleHelpComponent(String... lines) {
+        this.lines = lines;
+    }
+
+    @Override
+    public int lineCount() {
+        return lines.length;
+    }
+
+    @Override
+    public void appendTo(StringBuilder sb) {
+        String[] lines = this.lines;
+        int len = lines.length;
+        if (0 < len) {
+            sb.append(lines[0]);
+        }
+        for (int i = 1; i < len; i++) {
+            sb.append('\n').append(lines[i]);
+        }
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/DefaultPageBuilder.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/DefaultPageBuilder.java
new file mode 100644
index 0000000..aaf4d1e
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/DefaultPageBuilder.java
@@ -0,0 +1,114 @@
+package io.dico.dicore.command.chat.help.defaults;
+
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.chat.help.*;
+import org.bukkit.permissions.Permissible;
+
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.ListIterator;
+
+public class DefaultPageBuilder implements IPageBuilder {
+
+    @Override
+    public String getPage(List<IHelpTopic> helpTopics, IPageLayout pageLayout, ICommandAddress target, Permissible viewer, ExecutionContext context, int pageNum, int pageLen) {
+        if (pageLen <= 0 || pageNum < 0) {
+            throw new IllegalArgumentException();
+        }
+
+        List<IHelpComponent> components = new LinkedList<>();
+        for (IHelpTopic topic : helpTopics) {
+            components.addAll(topic.getComponents(target, viewer, context));
+        }
+
+        PageBorders pageBorders = null;
+        int componentStartIdx = -1;
+        int componentEndIdx = -1;
+        int totalPageCount = 0;
+        int curPageLines = 0;
+
+        ListIterator<IHelpComponent> iterator = components.listIterator();
+
+        while (iterator.hasNext()) {
+            if (curPageLines == 0) {
+
+                if (pageBorders != null) {
+                    iterator.add(pageBorders.getFooter());
+                }
+
+                if (pageNum == totalPageCount) {
+                    componentStartIdx = iterator.nextIndex();
+                } else if (pageNum + 1 == totalPageCount) {
+                    componentEndIdx = iterator.nextIndex();
+                }
+
+                pageBorders = pageLayout.getPageBorders(target, viewer, context, totalPageCount + 1);
+
+                if (pageBorders != null) {
+                    iterator.add(pageBorders.getHeader());
+                    iterator.previous();
+
+                    curPageLines += pageBorders.getFooter().lineCount();
+                }
+
+                totalPageCount++;
+            }
+
+            IHelpComponent component = iterator.next();
+            int lineCount = component.lineCount();
+            curPageLines += lineCount;
+
+            if (curPageLines >= pageLen) {
+                curPageLines = 0;
+            }
+        }
+
+        if (componentStartIdx == -1) {
+            // page does not exist
+            return "";
+        }
+
+        if (componentEndIdx == -1) {
+            componentEndIdx = components.size();
+        }
+
+        StringBuilder sb = new StringBuilder();
+        iterator = components.listIterator(componentStartIdx);
+        int count = componentEndIdx - componentStartIdx;
+        boolean first = true;
+
+        while (count-- > 0) {
+            IHelpComponent component = iterator.next();
+            if (component instanceof IPageBorder) {
+                ((IPageBorder) component).setPageCount(totalPageCount);
+            }
+            if (first) {
+                first = false;
+            } else {
+                sb.append('\n');
+            }
+            component.appendTo(sb);
+
+        }
+
+        return sb.toString();
+    }
+
+    public static String combine(List<IHelpComponent> components) {
+        StringBuilder rv = new StringBuilder();
+
+        Iterator<IHelpComponent> iterator = components.iterator();
+        if (iterator.hasNext()) {
+            iterator.next().appendTo(rv);
+        }
+        while (iterator.hasNext()) {
+            rv.append('\n');
+            iterator.next().appendTo(rv);
+        }
+
+        return rv.toString();
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/DefaultPageLayout.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/DefaultPageLayout.java
new file mode 100644
index 0000000..e8f9bce
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/DefaultPageLayout.java
@@ -0,0 +1,40 @@
+package io.dico.dicore.command.chat.help.defaults;
+
+import io.dico.dicore.command.EMessageType;
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.ModifiableCommandAddress;
+import io.dico.dicore.command.chat.Formatting;
+import io.dico.dicore.command.chat.IChatController;
+import io.dico.dicore.command.chat.help.IPageBorder;
+import io.dico.dicore.command.chat.help.IPageLayout;
+import io.dico.dicore.command.chat.help.PageBorders;
+import org.bukkit.permissions.Permissible;
+
+public class DefaultPageLayout implements IPageLayout {
+
+    @Override
+    public PageBorders getPageBorders(ICommandAddress target, Permissible viewer, ExecutionContext context, int pageNum) {
+        IChatController c = context.getAddress().getChatController();
+        String prefix = c.getMessagePrefixForType(EMessageType.INFORMATIVE);
+        Formatting informative = c.getChatFormatForType(EMessageType.INFORMATIVE);
+        Formatting number = c.getChatFormatForType(EMessageType.NEUTRAL);
+
+        String nextPageCommand;
+        ICommandAddress executor = context.getAddress();
+        if (((ModifiableCommandAddress) executor).hasHelpCommand()) {
+            nextPageCommand = ((ModifiableCommandAddress) executor).getHelpCommand().getAddress() + ' ' + (pageNum + 1);
+        } else {
+            nextPageCommand = executor.getAddress() + ' ' + (pageNum + 1);
+        }
+
+        String header = prefix + informative + "Help page " + number + pageNum + informative +
+                '/' + number + "%pageCount%" + informative + " for /" + target.getAddress();
+        String footer = informative + "Type /" + nextPageCommand + " for the next page";
+
+        IPageBorder headerBorder = PageBorders.simpleBorder("", header);
+        IPageBorder footerBorder = PageBorders.disappearingBorder(pageNum, footer);
+        return new PageBorders(headerBorder, footerBorder);
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/DescriptionHelpTopic.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/DescriptionHelpTopic.java
new file mode 100644
index 0000000..d1a6445
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/DescriptionHelpTopic.java
@@ -0,0 +1,45 @@
+package io.dico.dicore.command.chat.help.defaults;
+
+import io.dico.dicore.command.Command;
+import io.dico.dicore.command.EMessageType;
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.chat.Formatting;
+import io.dico.dicore.command.chat.help.IHelpComponent;
+import io.dico.dicore.command.chat.help.IHelpTopic;
+import io.dico.dicore.command.chat.help.SimpleHelpComponent;
+import org.bukkit.permissions.Permissible;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class DescriptionHelpTopic implements IHelpTopic {
+
+    @Override
+    public List<IHelpComponent> getComponents(ICommandAddress target, Permissible viewer, ExecutionContext context) {
+        List<IHelpComponent> out = new ArrayList<>();
+        Formatting format = context.getFormat(EMessageType.DESCRIPTION);
+
+        if (!target.hasCommand()) {
+            return out;
+        }
+        Command command = target.getCommand();
+        String[] description = command.getDescription();
+        if (description.length == 0) {
+            String shortDescription = command.getShortDescription();
+            if (shortDescription == null) {
+                return out;
+            }
+
+            description = new String[]{shortDescription};
+        }
+
+        for (int i = 0; i < description.length; i++) {
+            description[i] = format + description[i];
+        }
+
+        out.add(new SimpleHelpComponent(description));
+        return out;
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/SubcommandsHelpTopic.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/SubcommandsHelpTopic.java
new file mode 100644
index 0000000..1e9922f
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/SubcommandsHelpTopic.java
@@ -0,0 +1,58 @@
+package io.dico.dicore.command.chat.help.defaults;
+
+import io.dico.dicore.command.EMessageType;
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.chat.Formatting;
+import io.dico.dicore.command.chat.help.IHelpComponent;
+import io.dico.dicore.command.chat.help.IHelpTopic;
+import io.dico.dicore.command.chat.help.SimpleHelpComponent;
+import io.dico.dicore.command.predef.PredefinedCommand;
+import org.bukkit.command.CommandSender;
+import org.bukkit.permissions.Permissible;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public class SubcommandsHelpTopic implements IHelpTopic {
+
+    @Override
+    public List<IHelpComponent> getComponents(ICommandAddress target, Permissible viewer, ExecutionContext context) {
+        List<IHelpComponent> out = new ArrayList<>();
+        Map<String, ? extends ICommandAddress> children = target.getChildren();
+        if (children.isEmpty()) {
+            //System.out.println("No subcommands");
+            return out;
+        }
+
+        CommandSender sender = viewer instanceof CommandSender ? (CommandSender) viewer : context.getSender();
+        children.values().stream().distinct().forEach(child -> {
+            if ((!child.hasCommand() || child.getCommand().isVisibleTo(sender)) && !(child instanceof PredefinedCommand)) {
+                out.add(getComponent(child, viewer, context));
+            }
+        });
+
+        return out;
+    }
+
+    public IHelpComponent getComponent(ICommandAddress child, Permissible viewer, ExecutionContext context) {
+        Formatting subcommand = colorOf(context, EMessageType.SUBCOMMAND);
+        Formatting highlight = colorOf(context, EMessageType.HIGHLIGHT);
+
+        String address = subcommand + "/" + child.getParent().getAddress() + ' ' + highlight + child.getMainKey();
+
+        String description = child.hasCommand() ? child.getCommand().getShortDescription() : null;
+        if (description != null) {
+            Formatting descriptionFormat = colorOf(context, EMessageType.DESCRIPTION);
+            return new SimpleHelpComponent(address, descriptionFormat + description);
+        }
+
+        return new SimpleHelpComponent(address);
+    }
+
+    private static Formatting colorOf(ExecutionContext context, EMessageType type) {
+        return context.getAddress().getChatController().getChatFormatForType(type);
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/SyntaxHelpTopic.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/SyntaxHelpTopic.java
new file mode 100644
index 0000000..7c0bc9d
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/defaults/SyntaxHelpTopic.java
@@ -0,0 +1,74 @@
+package io.dico.dicore.command.chat.help.defaults;
+
+import io.dico.dicore.command.Command;
+import io.dico.dicore.command.EMessageType;
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.chat.Formatting;
+import io.dico.dicore.command.chat.help.IHelpComponent;
+import io.dico.dicore.command.chat.help.IHelpTopic;
+import io.dico.dicore.command.chat.help.SimpleHelpComponent;
+import io.dico.dicore.command.parameter.Parameter;
+import io.dico.dicore.command.parameter.ParameterList;
+import org.bukkit.permissions.Permissible;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+public class SyntaxHelpTopic implements IHelpTopic {
+
+    @Override
+    public List<IHelpComponent> getComponents(ICommandAddress target, Permissible viewer, ExecutionContext context) {
+        if (!target.hasCommand()) {
+            return Collections.emptyList();
+        }
+
+        String line = context.getFormat(EMessageType.SYNTAX) + "Syntax: "
+                + context.getFormat(EMessageType.INSTRUCTION) + target.getAddress()
+                + ' ' + getShortSyntax(target, context);
+
+        return Collections.singletonList(new SimpleHelpComponent(line));
+    }
+
+    private static String getShortSyntax(ICommandAddress target, ExecutionContext ctx) {
+        StringBuilder syntax = new StringBuilder();
+        if (target.hasCommand()) {
+            Formatting syntaxColor = ctx.getFormat(EMessageType.SYNTAX);
+            Formatting highlight = ctx.getFormat(EMessageType.HIGHLIGHT);
+            syntax.append(syntaxColor);
+
+            Command command = target.getCommand();
+            ParameterList list = command.getParameterList();
+            Parameter<?, ?> repeated = list.getRepeatedParameter();
+
+            int requiredCount = list.getRequiredCount();
+            List<Parameter<?, ?>> indexedParameters = list.getIndexedParameters();
+            for (int i = 0, n = indexedParameters.size(); i < n; i++) {
+                syntax.append(i < requiredCount ? " <" : " [");
+                Parameter<?, ?> param = indexedParameters.get(i);
+                syntax.append(param.getName());
+                if (param == repeated) {
+                    syntax.append(highlight).append("...").append(syntaxColor);
+                }
+                syntax.append(i < requiredCount ? '>' : ']');
+            }
+
+            Map<String, Parameter<?, ?>> parametersByName = list.getParametersByName();
+            for (Parameter<?, ?> param : parametersByName.values()) {
+                if (param.isFlag()) {
+                    syntax.append(" [").append(param.getName());
+                    if (param.expectsInput()) {
+                        syntax.append(" <").append(param.getName()).append(">");
+                    }
+                    syntax.append(']');
+                }
+            }
+
+        } else {
+            syntax.append(' ');
+        }
+        return syntax.toString();
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/EInsertionStage.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/EInsertionStage.java
new file mode 100644
index 0000000..4f0026d
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/EInsertionStage.java
@@ -0,0 +1,29 @@
+package io.dico.dicore.command.chat.help.insertion;
+
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.chat.help.IHelpComponent;
+import org.bukkit.permissions.Permissible;
+
+import java.util.List;
+
+public enum EInsertionStage implements IInsertionFunction {
+    START {
+        @Override
+        public int insertionIndex(List<IHelpComponent> current, ICommandAddress target, Permissible viewer, ExecutionContext context) {
+            return 0;
+        }
+    },
+    CENTER {
+        @Override
+        public int insertionIndex(List<IHelpComponent> current, ICommandAddress target, Permissible viewer, ExecutionContext context) {
+            return current.size() / 2;
+        }
+    },
+    END {
+        @Override
+        public int insertionIndex(List<IHelpComponent> current, ICommandAddress target, Permissible viewer, ExecutionContext context) {
+            return current.size();
+        }
+    }
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/HelpComponentInserter.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/HelpComponentInserter.java
new file mode 100644
index 0000000..f8ae713
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/HelpComponentInserter.java
@@ -0,0 +1,43 @@
+package io.dico.dicore.command.chat.help.insertion;
+
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.chat.help.HelpTopicModifier;
+import io.dico.dicore.command.chat.help.IHelpComponent;
+import io.dico.dicore.command.chat.help.IHelpTopic;
+import org.bukkit.permissions.Permissible;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class HelpComponentInserter extends HelpTopicModifier {
+    private List<IInsertion> insertions = new ArrayList<>();
+
+    public HelpComponentInserter(IHelpTopic delegate) {
+        super(delegate);
+    }
+
+    @Override
+    protected List<IHelpComponent> modify(List<IHelpComponent> components, ICommandAddress target, Permissible viewer, ExecutionContext context) {
+        int componentCount = components.size();
+
+        for (int i = insertions.size() - 1; i >= 0; i--) {
+            IInsertion insertion = insertions.get(i);
+            int idx = insertion.insertionIndex(components, target, viewer, context);
+            List<IHelpComponent> inserted = insertion.getComponents(target, viewer, context);
+            components.addAll(idx, inserted);
+        }
+
+        return components;
+    }
+
+    public HelpComponentInserter insert(IInsertionFunction insertionFunction, IHelpTopic helpTopic) {
+        return insert(Insertions.combine(helpTopic, insertionFunction));
+    }
+
+    public HelpComponentInserter insert(IInsertion insertion) {
+        insertions.add(insertion);
+        return this;
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/IInsertion.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/IInsertion.java
new file mode 100644
index 0000000..757cb91
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/IInsertion.java
@@ -0,0 +1,7 @@
+package io.dico.dicore.command.chat.help.insertion;
+
+import io.dico.dicore.command.chat.help.IHelpTopic;
+
+interface IInsertion extends IHelpTopic, IInsertionFunction {
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/IInsertionFunction.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/IInsertionFunction.java
new file mode 100644
index 0000000..e99c246
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/IInsertionFunction.java
@@ -0,0 +1,14 @@
+package io.dico.dicore.command.chat.help.insertion;
+
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.chat.help.IHelpComponent;
+import org.bukkit.permissions.Permissible;
+
+import java.util.List;
+
+public interface IInsertionFunction {
+
+    int insertionIndex(List<IHelpComponent> current, ICommandAddress target, Permissible viewer, ExecutionContext context);
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/Insertions.java b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/Insertions.java
new file mode 100644
index 0000000..042cd72
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/chat/help/insertion/Insertions.java
@@ -0,0 +1,31 @@
+package io.dico.dicore.command.chat.help.insertion;
+
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.chat.help.IHelpComponent;
+import io.dico.dicore.command.chat.help.IHelpTopic;
+import org.bukkit.permissions.Permissible;
+
+import java.util.List;
+
+public class Insertions {
+
+    private Insertions() {
+
+    }
+
+    public static IInsertion combine(IHelpTopic topic, IInsertionFunction function) {
+        return new IInsertion() {
+            @Override
+            public List<IHelpComponent> getComponents(ICommandAddress target, Permissible viewer, ExecutionContext context) {
+                return topic.getComponents(target, viewer, context);
+            }
+
+            @Override
+            public int insertionIndex(List<IHelpComponent> current, ICommandAddress target, Permissible viewer, ExecutionContext context) {
+                return function.insertionIndex(current, target, viewer, context);
+            }
+        };
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/ArgumentBuffer.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/ArgumentBuffer.java
new file mode 100644
index 0000000..e063000
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/ArgumentBuffer.java
@@ -0,0 +1,282 @@
+package io.dico.dicore.command.parameter;
+
+import io.dico.dicore.command.CommandException;
+
+import java.util.*;
+
+/**
+ * Buffer for the arguments.
+ * Easy to traverse for the parser.
+ */
+public class ArgumentBuffer extends AbstractList<String> implements Iterator<String>, RandomAccess {
+    private String[] array;
+    private int cursor = 0; // index of the next return value
+    private transient ArgumentBuffer unaffectingCopy = null; // see #getUnaffectingCopy()
+
+    public ArgumentBuffer(String label, String[] args) {
+        this(combine(label, args));
+    }
+
+    private static String[] combine(String label, String[] args) {
+        String[] result;
+        //if (args.length > 0 && "".equals(args[args.length - 1])) {
+        //    // drop the last element of args if it is empty
+        //    result = args;
+        //} else {
+            result = new String[args.length + 1];
+        //}
+        System.arraycopy(args, 0, result, 1, result.length - 1);
+        result[0] = Objects.requireNonNull(label);
+        return result;
+    }
+
+    /**
+     * Constructs a new ArgumentBuffer using the given array, without copying it first.
+     * None of the array its elements should be empty.
+     *
+     * @param array the array
+     */
+    public ArgumentBuffer(String[] array) {
+        this.array = Objects.requireNonNull(array);
+    }
+
+    public int getCursor() {
+        return cursor;
+    }
+
+    public ArgumentBuffer setCursor(int cursor) {
+        if (cursor <= 0) {
+            cursor = 0;
+        } else if (size() <= cursor) {
+            cursor = size();
+        }
+        this.cursor = cursor;
+        return this;
+    }
+
+    @Override
+    public int size() {
+        return array.length;
+    }
+
+    @Override
+    public String get(int index) {
+        return array[index];
+    }
+
+    public int nextIndex() {
+        return cursor;
+    }
+
+    public int previousIndex() {
+        return cursor - 1;
+    }
+
+    public int remainingElements() {
+        return size() - nextIndex() - 1;
+    }
+
+    @Override
+    public boolean hasNext() {
+        return nextIndex() < size();
+    }
+
+    public boolean hasPrevious() {
+        return 0 <= previousIndex();
+    }
+
+    /**
+     * Unlike conventional ListIterator implementations, this returns null if there is no next element
+     *
+     * @return the next value, or null
+     */
+    @Override
+    public String next() {
+        return hasNext() ? get(cursor++) : null;
+    }
+
+    public String requireNext(String parameterName) throws CommandException {
+        String next = next();
+        if (next == null) {
+            throw CommandException.missingArgument(parameterName);
+        }
+        return next;
+    }
+
+    // useful for completion code
+    public String nextOrEmpty() {
+        return hasNext() ? get(cursor++) : "";
+    }
+
+    /**
+     * Unlike conventional ListIterator implementations, this returns null if there is no previous element
+     *
+     * @return the previous value, or null
+     */
+    public String previous() {
+        return hasPrevious() ? get(--cursor) : null;
+    }
+
+    public String peekNext() {
+        return hasNext() ? get(cursor) : null;
+    }
+
+    public String peekPrevious() {
+        return hasPrevious() ? get(cursor - 1) : null;
+    }
+
+    public ArgumentBuffer advance() {
+        return advance(1);
+    }
+
+    public ArgumentBuffer advance(int amount) {
+        cursor = Math.min(Math.max(0, cursor + amount), size());
+        return this;
+    }
+
+    public ArgumentBuffer rewind() {
+        return rewind(1);
+    }
+
+    public ArgumentBuffer rewind(int amount) {
+        return advance(-amount);
+    }
+
+    String[] getArray() {
+        return array;
+    }
+
+    public String[] getArrayFromCursor() {
+        return getArrayFromIndex(cursor);
+    }
+
+    public String[] getArrayFromIndex(int index) {
+        return Arrays.copyOfRange(array, index, array.length);
+    }
+
+    public String getRawInput() {
+        return String.join(" ", array);
+    }
+
+    public String[] toArray() {
+        return array.clone();
+    }
+
+    @Override
+    public Iterator<String> iterator() {
+        return this;
+    }
+
+    @Override
+    public ListIterator<String> listIterator() {
+        return new ListIterator<String>() {
+            @Override
+            public boolean hasNext() {
+                return ArgumentBuffer.this.hasNext();
+            }
+
+            @Override
+            public String next() {
+                if (!hasNext()) {
+                    throw new NoSuchElementException();
+                }
+                return ArgumentBuffer.this.next();
+            }
+
+            @Override
+            public boolean hasPrevious() {
+                return ArgumentBuffer.this.hasPrevious();
+            }
+
+            @Override
+            public String previous() {
+                if (!hasPrevious()) {
+                    throw new NoSuchElementException();
+                }
+                return ArgumentBuffer.this.previous();
+            }
+
+            @Override
+            public int nextIndex() {
+                return ArgumentBuffer.this.nextIndex();
+            }
+
+            @Override
+            public int previousIndex() {
+                return ArgumentBuffer.this.previousIndex();
+            }
+
+            @Override
+            public void remove() {
+                throw new UnsupportedOperationException();
+            }
+
+            @Override
+            public void set(String s) {
+                throw new UnsupportedOperationException();
+            }
+
+            @Override
+            public void add(String s) {
+                throw new UnsupportedOperationException();
+            }
+        };
+    }
+
+    public void dropTrailingEmptyElements() {
+        int removeCount = 0;
+        String[] array = this.array;
+        for (int i = array.length - 1; i >= 0; i--) {
+            if ("".equals(array[i])) {
+                removeCount++;
+            }
+        }
+
+        if (removeCount > 0) {
+            String[] newArray = new String[array.length - removeCount];
+            System.arraycopy(array, 0, newArray, 0, newArray.length);
+            this.array = newArray;
+
+            if (cursor > newArray.length) {
+                cursor = newArray.length;
+            }
+        }
+    }
+
+    public ArgumentBuffer preprocessArguments(IArgumentPreProcessor preProcessor) {
+        String[] array = this.array;
+        // processor shouldn't touch any items prior to the cursor
+        if (array != (array = preProcessor.process(cursor, array))) {
+            return new ArgumentBuffer(array).setCursor(cursor);
+        }
+        return this;
+    }
+
+    /**
+     * Allows a piece of code to traverse this buffer without modifying its cursor.
+     * After this method has been called for the first time on this instance, if this method
+     * or the {@link #clone()} method are called, the operation carried out on the prior result has finished.
+     * As such, the same instance might be returned again.
+     *
+     * @return A view of this buffer that doesn't affect this buffer's cursor.
+     */
+    public ArgumentBuffer getUnaffectingCopy() {
+        // the copy doesn't alter the cursor of this ArgumentBuffer when moved, but traverses the same array reference.
+        // there is only ever one copy of an ArgumentBuffer, the cursor of which is updated on every call to this method.
+
+        ArgumentBuffer unaffectingCopy = this.unaffectingCopy;
+        if (unaffectingCopy == null) {
+            this.unaffectingCopy = unaffectingCopy = new ArgumentBuffer(array);
+        }
+        unaffectingCopy.cursor = this.cursor;
+        return unaffectingCopy;
+    }
+
+    @SuppressWarnings("MethodDoesntCallSuperMethod")
+    public ArgumentBuffer clone() {
+        ArgumentBuffer result = getUnaffectingCopy();
+        this.unaffectingCopy = null;
+        return result;
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/ContextParser.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/ContextParser.java
new file mode 100644
index 0000000..8a3f236
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/ContextParser.java
@@ -0,0 +1,270 @@
+package io.dico.dicore.command.parameter;
+
+import io.dico.dicore.command.CommandException;
+import io.dico.dicore.command.ExecutionContext;
+
+import java.lang.reflect.Array;
+import java.util.*;
+
+public class ContextParser {
+    private final ExecutionContext m_context;
+    private final ArgumentBuffer m_buffer;
+    private final ParameterList m_paramList;
+    private final Parameter<?, ?> m_repeatedParam;
+    private final List<Parameter<?, ?>> m_indexedParams;
+    private final int m_maxIndex;
+    private final int m_requiredIndex;
+
+    private Map<String, Object> m_valueMap = new HashMap<>();
+    private Set<String> m_parsedKeys = new HashSet<>();
+    private int m_completionCursor = -1;
+    private Parameter<?, ?> m_completionTarget = null;
+
+    public ContextParser(ExecutionContext context) {
+        this.m_context = context;
+        this.m_buffer = context.getProcessedBuffer();
+        this.m_paramList = context.getParameterList();
+        this.m_repeatedParam = m_paramList.getRepeatedParameter();
+        this.m_indexedParams = m_paramList.getIndexedParameters();
+        this.m_maxIndex = m_indexedParams.size() - 1;
+        this.m_requiredIndex = m_paramList.getRequiredCount() - 1;
+    }
+
+    public ExecutionContext getContext() {
+        return m_context;
+    }
+
+    public Map<String, Object> getValueMap() {
+        return m_valueMap;
+    }
+
+    public Set<String> getParsedKeys() {
+        return m_parsedKeys;
+    }
+
+    public void parse() throws CommandException {
+        parseAllParameters();
+    }
+
+    public int getCompletionCursor() {
+        if (!m_done) {
+            throw new IllegalStateException();
+        }
+        return m_completionCursor;
+    }
+
+    public Parameter<?, ?> getCompletionTarget() {
+        if (!m_done) {
+            throw new IllegalStateException();
+        }
+        return m_completionTarget;
+    }
+
+    // ################################
+    // # PARSING METHODS              #
+    // ################################
+
+    private boolean m_repeating = false;
+    private boolean m_done = false;
+    private int m_curParamIndex = -1;
+    private Parameter<?, ?> m_curParam = null;
+    private List<Object> m_curRepeatingList = null;
+
+    private void parseAllParameters() throws CommandException {
+        try {
+            do {
+                prepareStateToParseParam();
+                if (m_done) break;
+                parseCurParam();
+            } while (!m_done);
+
+        } finally {
+            m_curParam = null;
+            m_curRepeatingList = null;
+            assignDefaultValuesToUncomputedParams();
+            arrayifyRepeatedParamValue();
+        }
+    }
+
+    private void prepareStateToParseParam() throws CommandException {
+
+        boolean requireInput;
+        if (identifyFlag()) {
+            m_buffer.advance();
+            prepareRepeatedParameterIfSet();
+            requireInput = false;
+
+        } else if (m_repeating) {
+            m_curParam = m_repeatedParam;
+            requireInput = false;
+
+        } else if (m_curParamIndex < m_maxIndex) {
+            m_curParamIndex++;
+            m_curParam = m_indexedParams.get(m_curParamIndex);
+            prepareRepeatedParameterIfSet();
+            requireInput = m_curParamIndex <= m_requiredIndex;
+
+        } else if (m_buffer.hasNext()) {
+            throw new CommandException("Too many arguments");
+
+        } else {
+            m_done = true;
+            return;
+        }
+
+        if (!m_buffer.hasNext()) {
+            if (requireInput) {
+                reportParameterRequired(m_curParam);
+            }
+
+            if (m_repeating) {
+                m_done = true;
+            }
+        }
+
+    }
+
+    private boolean identifyFlag() {
+        String potentialFlag = m_buffer.peekNext();
+        Parameter<?, ?> target;
+        if (potentialFlag != null
+                && potentialFlag.startsWith("-")
+                && (target = m_paramList.getParameterByName(potentialFlag)) != null
+                && target.isFlag()
+                && !m_valueMap.containsKey(potentialFlag)
+
+//              Disabled because it's checked by {@link Parameter#parse(ExecutionContext, ArgumentBuffer)}
+//              && (target.getFlagPermission() == null || m_context.getSender().hasPermission(target.getFlagPermission()))
+                ) {
+            m_curParam = target;
+            return true;
+        }
+
+        return false;
+    }
+
+    private void prepareRepeatedParameterIfSet() throws CommandException {
+        if (m_curParam != null && m_curParam == m_repeatedParam) {
+
+            if (m_curParam.isFlag() && m_curParamIndex < m_requiredIndex) {
+                Parameter<?, ?> requiredParam = m_indexedParams.get(m_curParamIndex + 1);
+                reportParameterRequired(requiredParam);
+            }
+
+            m_curRepeatingList = new ArrayList<>();
+            assignValue(m_curRepeatingList);
+            m_repeating = true;
+        }
+    }
+
+    private void reportParameterRequired(Parameter<?, ?> param) throws CommandException {
+        throw new CommandException("The argument '" + param.getName() + "' is required");
+    }
+
+    private void parseCurParam() throws CommandException {
+        if (!m_buffer.hasNext() && !m_curParam.isFlag()) {
+            assignDefaultValue();
+            return;
+        }
+
+        int cursorStart = m_buffer.getCursor();
+
+        if (m_context.isTabComplete() && "".equals(m_buffer.peekNext())) {
+            assignAsCompletionTarget(cursorStart);
+            return;
+        }
+
+        Object parseResult;
+        try {
+            parseResult = m_curParam.parse(m_context, m_buffer);
+        } catch (CommandException e) {
+            assignAsCompletionTarget(cursorStart);
+            throw e;
+        }
+
+        assignValue(parseResult);
+        m_parsedKeys.add(m_curParam.getName());
+    }
+
+    private void assignDefaultValue() throws CommandException {
+        assignValue(m_curParam.getDefaultValue(m_context, m_buffer));
+    }
+
+    private void assignAsCompletionTarget(int cursor) {
+        m_completionCursor = cursor;
+        m_completionTarget = m_curParam;
+        m_done = true;
+    }
+
+    private void assignValue(Object value) {
+        if (m_repeating) {
+            m_curRepeatingList.add(value);
+        } else {
+            m_valueMap.put(m_curParam.getName(), value);
+        }
+    }
+
+    private void assignDefaultValuesToUncomputedParams() throws CommandException {
+        // add default values for unset parameters
+        for (Map.Entry<String, Parameter<?, ?>> entry : m_paramList.getParametersByName().entrySet()) {
+            String name = entry.getKey();
+            if (!m_valueMap.containsKey(name)) {
+                if (m_repeatedParam == entry.getValue()) {
+                    // below value will be turned into an array later
+                    m_valueMap.put(name, Collections.emptyList());
+                } else {
+                    m_valueMap.put(name, entry.getValue().getDefaultValue(m_context, m_buffer));
+                }
+            }
+        }
+    }
+
+    private void arrayifyRepeatedParamValue() {
+        if (m_repeatedParam != null) {
+            m_valueMap.computeIfPresent(m_repeatedParam.getName(), (k, v) -> {
+                List list = (List) v;
+                Class<?> returnType = m_repeatedParam.getType().getReturnType();
+                Object array = Array.newInstance(returnType, list.size());
+                ArraySetter setter = ArraySetter.getSetter(returnType);
+                for (int i = 0, n = list.size(); i < n; i++) {
+                    setter.set(array, i, list.get(i));
+                }
+
+                return array;
+            });
+        }
+    }
+
+    private interface ArraySetter {
+        void set(Object array, int index, Object value);
+
+        static ArraySetter getSetter(Class<?> clazz) {
+            if (!clazz.isPrimitive()) {
+                return (array, index, value) -> ((Object[]) array)[index] = value;
+            }
+
+            switch (clazz.getSimpleName()) {
+                case "boolean":
+                    return (array, index, value) -> ((boolean[]) array)[index] = (boolean) value;
+                case "int":
+                    return (array, index, value) -> ((int[]) array)[index] = (int) value;
+                case "double":
+                    return (array, index, value) -> ((double[]) array)[index] = (double) value;
+                case "long":
+                    return (array, index, value) -> ((long[]) array)[index] = (long) value;
+                case "short":
+                    return (array, index, value) -> ((short[]) array)[index] = (short) value;
+                case "byte":
+                    return (array, index, value) -> ((byte[]) array)[index] = (byte) value;
+                case "float":
+                    return (array, index, value) -> ((float[]) array)[index] = (float) value;
+                case "char":
+                    return (array, index, value) -> ((char[]) array)[index] = (char) value;
+                case "void":
+                default:
+                    throw new InternalError("This should not happen");
+            }
+        }
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/IArgumentPreProcessor.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/IArgumentPreProcessor.java
new file mode 100644
index 0000000..4ac9bd3
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/IArgumentPreProcessor.java
@@ -0,0 +1,126 @@
+package io.dico.dicore.command.parameter;
+
+/**
+ * An interface to process tokens such as quotes
+ */
+public interface IArgumentPreProcessor {
+
+    /**
+     * Preprocess the arguments without modifying the array.
+     * Might return the same array (in which case no changes were made).
+     *
+     * @param argStart the index within the array where the given arguments start (the part before that identifies the command)
+     * @param args     the arguments
+     * @return the arguments after preprocessing
+     */
+    String[] process(int argStart, String[] args);
+
+    IArgumentPreProcessor NONE = (argStart, args) -> args;
+
+    /**
+     * Get an IArgumentPreProcessor that merges arguments between any two tokens
+     *
+     * @param tokens     The tokens that the merged arguments should be enclosed by, in subsequent pairs.
+     *                   Example: []{}""
+     *                   This would mean the following would be merged: [ hello this is a merged argument]
+     * @param escapeChar the char that can be used to escape the given tokens
+     * @return The IArgumentPreProcessor
+     */
+    static IArgumentPreProcessor mergeOnTokens(String tokens, char escapeChar) {
+        if (tokens.isEmpty() || (tokens.length() & 1) != 0) {
+            throw new IllegalArgumentException();
+        }
+
+        return (argStart, args) -> {
+            if (!(0 <= argStart && argStart <= args.length)) {
+                throw new IndexOutOfBoundsException();
+            }
+
+            args = args.clone();
+            int removeCount = 0;
+            int closingTokenIdx = 0;
+            int sectionStart = -1;
+
+            for (int i = argStart; i < args.length; i++) {
+                String arg = args[i];
+                if (arg == null || arg.isEmpty()) {
+                    continue;
+                }
+
+                if (closingTokenIdx != 0) {
+                    int idx = tokens.indexOf(arg.charAt(arg.length() - 1));
+                    if (idx == closingTokenIdx) {
+
+                        // count escape chars
+                        int index = arg.length() - 1;
+                        int count = 0;
+                        while (index > 0 && arg.charAt(--index) == escapeChar) {
+                            count++;
+                        }
+
+                        // remove the final char plus half the count, rounding upwards.
+                        args[i] = arg.substring(0, args.length - 1 - (count + 1) / 2);
+
+                        if ((count & 1) == 0) {
+                            // not escaped
+                            StringBuilder concat = new StringBuilder(args[sectionStart].substring(1));
+                            for (int j = sectionStart + 1; j <= i; j++) {
+                                concat.append(' ').append(args[j]);
+                                args[j] = null;
+                                removeCount++;
+                            }
+
+                            args[sectionStart] = concat.toString();
+
+                            sectionStart = -1;
+                            closingTokenIdx = 0;
+
+                        } else {
+                            // it's escaped
+                            // add final char because it was escaped
+                            args[i] += tokens.charAt(closingTokenIdx);
+
+                        }
+                    }
+
+                    if (i == args.length - 1) {
+                        // if the closing token isn't found, reset state and start from the index subsequent to the one where the opener was found
+                        // it should also undo removal of any escapes... it doesn't do that
+                        i = sectionStart + 1;
+                        closingTokenIdx = 0;
+                        sectionStart = -1;
+                    }
+
+                    continue;
+                }
+
+                int idx = tokens.indexOf(arg.charAt(0));
+                if (idx == -1 || (idx & 1) != 0) {
+                    continue;
+                }
+
+                closingTokenIdx = idx | 1;
+                sectionStart = i;
+
+                // make sure to check from the current index for a closer
+                i--;
+            }
+
+            if (removeCount == 0) {
+                return args;
+            }
+
+            String[] result = new String[args.length - removeCount];
+            int i = 0;
+            for (String arg : args) {
+                if (arg != null) {
+                    result[i++] = arg;
+                }
+            }
+
+            return result;
+        };
+
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/Parameter.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/Parameter.java
new file mode 100644
index 0000000..ca66068
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/Parameter.java
@@ -0,0 +1,129 @@
+package io.dico.dicore.command.parameter;
+
+import io.dico.dicore.command.CommandException;
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.Validate;
+import io.dico.dicore.command.annotation.Range;
+import io.dico.dicore.command.parameter.type.ParameterType;
+import org.bukkit.Location;
+
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * IParameter object.
+ *
+ * @param <TResult>    the parameter's type
+ * @param <TParamInfo> the parameter info object. Example: {@link Range.Memory}
+ */
+public class Parameter<TResult, TParamInfo> {
+    private final String name;
+    private final String description;
+    private final ParameterType<TResult, TParamInfo> parameterType;
+    private final TParamInfo paramInfo;
+    private final boolean flag;
+    private final String flagPermission;
+
+    public Parameter(String name, String description, ParameterType<TResult, TParamInfo> parameterType, TParamInfo paramInfo) {
+        this(name, description, parameterType, paramInfo, false, null);
+    }
+
+    public Parameter(String name, String description, ParameterType<TResult, TParamInfo> parameterType, TParamInfo paramInfo, boolean flag, String flagPermission) {
+        this.name = Objects.requireNonNull(name);
+        this.description = description == null ? "" : description;
+        this.parameterType = flag ? parameterType.asFlagParameter() : parameterType;
+        /*
+        if (paramInfo == null && parameterType.getParameterConfig() != null) {
+            paramInfo = parameterType.getParameterConfig().getDefaultValue();
+        }
+        */
+        this.paramInfo = paramInfo;
+
+        this.flag = flag;
+        this.flagPermission = flagPermission;
+
+        if (flag && !name.startsWith("-")) {
+            throw new IllegalArgumentException("Flag parameter's name must start with -");
+        } else if (!flag && name.startsWith("-")) {
+            throw new IllegalArgumentException("Non-flag parameter's name may not start with -");
+        }
+    }
+
+    public static <TResult> Parameter<TResult, ?> newParameter(String name, String description, ParameterType<TResult, ?> type) {
+        return new Parameter<>(name, description, type, null);
+    }
+
+    public static <TResult, TParamInfo> Parameter<TResult, TParamInfo> newParameter(String name, String description, ParameterType<TResult, TParamInfo> type, TParamInfo info) {
+        return new Parameter<>(name, description, type, info);
+    }
+
+    public static <TResult, TParamInfo> Parameter<TResult, TParamInfo> newParameter(String name, String description, ParameterType<TResult, TParamInfo> parameterType, TParamInfo paramInfo, boolean flag, String flagPermission) {
+        return new Parameter<>(name, description, parameterType, paramInfo, flag, flagPermission);
+    }
+
+    public TResult parse(ExecutionContext context, ArgumentBuffer buffer) throws CommandException {
+        if (getFlagPermission() != null) {
+            Validate.isAuthorized(context.getSender(), getFlagPermission(), "You do not have permission to use the flag " + name);
+        }
+        return checkAllowed(context, parameterType.parseForContext(this, context, buffer));
+    }
+
+    public TResult getDefaultValue(ExecutionContext context, ArgumentBuffer buffer) throws CommandException {
+        return parameterType.getDefaultValueForContext(this, context, buffer);
+    }
+
+    public List<String> complete(ExecutionContext context, Location location, ArgumentBuffer buffer) {
+        return parameterType.completeForContext(this, context, location, buffer);
+    }
+
+    public TResult checkAllowed(ExecutionContext context, TResult result) throws CommandException {
+        return result;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public ParameterType<TResult, TParamInfo> getType() {
+        return parameterType;
+    }
+
+    public TParamInfo getParamInfo() {
+        return paramInfo;
+    }
+
+    public boolean isFlag() {
+        return flag;
+    }
+
+    // override with false for the flag parameter that simply must be present
+    public boolean expectsInput() {
+        return parameterType.getExpectedAmountOfConsumedArguments() > 0;
+    }
+
+    public String getFlagPermission() {
+        return flag ? flagPermission : null;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (!(o instanceof Parameter)) return false;
+        /*
+        IParameter<?, ?> parameter = (IParameter<?, ?>) o;
+        
+        return name.equals(parameter.name);
+        */
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return name.hashCode();
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/ParameterList.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/ParameterList.java
new file mode 100644
index 0000000..582d20a
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/ParameterList.java
@@ -0,0 +1,128 @@
+package io.dico.dicore.command.parameter;
+
+import java.util.*;
+
+/**
+ * IParameter definition for a command
+ */
+public class ParameterList {
+    private List<Parameter<?, ?>> indexedParameters;
+    private Map<String, Parameter<?, ?>> byName;
+    private IArgumentPreProcessor argumentPreProcessor = IArgumentPreProcessor.NONE;
+    private int requiredCount = -1;
+    private boolean repeatFinalParameter;
+
+    // if the final parameter is repeated and the command is implemented through reflection,
+    // the repeated parameter is simply the last parameter of the method, rather than the last
+    // indexed parameter. This might be a flag. As such, this field exists to ensure the correct
+    // parameter is taken for repeating
+    private boolean finalParameterMayBeFlag;
+
+    public ParameterList() {
+        this.indexedParameters = new ArrayList<>();
+        this.byName = new LinkedHashMap<>();
+        this.repeatFinalParameter = false;
+    }
+
+    public IArgumentPreProcessor getArgumentPreProcessor() {
+        return argumentPreProcessor;
+    }
+
+    public ParameterList setArgumentPreProcessor(IArgumentPreProcessor argumentPreProcessor) {
+        this.argumentPreProcessor = argumentPreProcessor == null ? IArgumentPreProcessor.NONE : argumentPreProcessor;
+        return this;
+    }
+
+    public boolean repeatFinalParameter() {
+        return repeatFinalParameter;
+    }
+
+    public ParameterList setRepeatFinalParameter(boolean repeatFinalParameter) {
+        this.repeatFinalParameter = repeatFinalParameter;
+        return this;
+    }
+
+    public boolean finalParameterMayBeFlag() {
+        return finalParameterMayBeFlag;
+    }
+
+    public ParameterList setFinalParameterMayBeFlag(boolean finalParameterMayBeFlag) {
+        this.finalParameterMayBeFlag = finalParameterMayBeFlag;
+        return this;
+    }
+
+    public int getRequiredCount() {
+        return requiredCount == -1 ? indexedParameters.size() : requiredCount;
+    }
+
+    public ParameterList setRequiredCount(int requiredCount) {
+        this.requiredCount = requiredCount;
+        return this;
+    }
+
+    public List<Parameter<?, ?>> getIndexedParameters() {
+        return Collections.unmodifiableList(indexedParameters);
+    }
+
+    public Parameter<?, ?> getParameterByName(String name) {
+        return byName.get(name);
+    }
+
+    public String getIndexedParameterName(int index) {
+        return indexedParameters.get(index).getName();
+    }
+
+    public Map<String, Parameter<?, ?>> getParametersByName() {
+        return Collections.unmodifiableMap(byName);
+    }
+
+    /**
+     * Add the given parameter to the end of this parameter list
+     * Can be a flag
+     *
+     * @param parameter the parameter
+     * @return this
+     */
+    public ParameterList addParameter(Parameter<?, ?> parameter) {
+        return addParameter(-1, parameter);
+    }
+
+    /**
+     * Add the given parameter to this parameter list
+     * If the parameter is a flag, the index is ignored
+     *
+     * @param index     parameter index number, -1 if end
+     * @param parameter the parameter
+     * @return this
+     * @throws NullPointerException if parameter is null
+     */
+    public ParameterList addParameter(int index, Parameter<?, ?> parameter) {
+        //System.out.println("Added parameter " + parameter.getName() + ", flag: " + parameter.isFlag());
+        byName.put(parameter.getName(), parameter);
+        if (!parameter.isFlag()) {
+            indexedParameters.add(index == -1 ? indexedParameters.size() : index, parameter);
+        }
+        return this;
+    }
+
+    public Parameter<?, ?> getRepeatedParameter() {
+        if (!repeatFinalParameter) {
+            return null;
+        }
+        if (finalParameterMayBeFlag) {
+            Iterator<Parameter<?, ?>> iterator = byName.values().iterator();
+            Parameter<?, ?> result = null;
+            while (iterator.hasNext()) {
+                result = iterator.next();
+            }
+            return result;
+        }
+
+        if (indexedParameters.isEmpty()) {
+            return null;
+        }
+
+        return indexedParameters.get(indexedParameters.size() - 1);
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/IParameterTypeSelector.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/IParameterTypeSelector.java
new file mode 100644
index 0000000..780ea0d
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/IParameterTypeSelector.java
@@ -0,0 +1,44 @@
+package io.dico.dicore.command.parameter.type;
+
+import java.lang.annotation.Annotation;
+
+/**
+ * An interface for an object that stores parameter types by {@link ParameterKey} and finds appropriate types for {@link ParameterKey parameterKeys}
+ */
+public interface IParameterTypeSelector {
+
+    <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectExact(ParameterKey key);
+
+    //<TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectExactOrSubclass(ParameterKey key);
+
+    <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectAny(ParameterKey key);
+
+
+    default <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectExact(Class<?> returnType) {
+        return selectExact(returnType, null);
+    }
+
+    default <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectExact(Class<?> returnType, Class<? extends Annotation> annotationClass) {
+        return selectExact(new ParameterKey(returnType, annotationClass));
+    }
+
+    /*
+    default <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectExactOrSubclass(Class<?> returnType) {
+        return selectExactOrSubclass(returnType, null);
+    }
+    
+    default <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectExactOrSubclass(Class<?> returnType, Class<? extends Annotation> annotationClass) {
+        return selectExactOrSubclass(new ParameterKey(returnType, annotationClass));
+    }
+    */
+    default <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectAny(Class<?> returnType) {
+        return selectAny(returnType, null);
+    }
+
+    default <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectAny(Class<?> returnType, Class<? extends Annotation> annotationClass) {
+        return selectAny(new ParameterKey(returnType, annotationClass));
+    }
+
+    void addType(boolean infolessAlias, ParameterType<?, ?> type);
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/MapBasedParameterTypeSelector.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/MapBasedParameterTypeSelector.java
new file mode 100644
index 0000000..4e475fe
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/MapBasedParameterTypeSelector.java
@@ -0,0 +1,109 @@
+package io.dico.dicore.command.parameter.type;
+
+import java.lang.annotation.Annotation;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Map based implementation of {@link IParameterTypeSelector}
+ */
+public class MapBasedParameterTypeSelector implements IParameterTypeSelector {
+    static final MapBasedParameterTypeSelector defaultSelector = new MapBasedParameterTypeSelector(false);
+    private final Map<ParameterKey, ParameterType<?, ?>> parameterTypeMap;
+    private final boolean useDefault;
+
+    public MapBasedParameterTypeSelector(boolean useDefault) {
+        this.parameterTypeMap = new HashMap<>();
+        this.useDefault = useDefault;
+    }
+
+    @Override
+    public <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectExact(ParameterKey key) {
+        ParameterType<?, ?> out = parameterTypeMap.get(key);
+        if (useDefault && out == null) {
+            out = defaultSelector.selectExact(key);
+        }
+        return cast(out);
+    }
+
+    @Override
+    public <TReturn, TParamInfo> ParameterType<TReturn, TParamInfo> selectAny(ParameterKey key) {
+        ParameterType<TReturn, TParamInfo> exact = selectExact(key);
+        if (exact != null) {
+            return exact;
+        }
+
+        if (key.getAnnotationClass() != null) {
+            exact = selectExact(new ParameterKey(key.getReturnType()));
+            if (exact != null) {
+                return exact;
+            }
+        }
+
+        Class<?> returnType = key.getReturnType();
+        Class<? extends Annotation> annotationClass = key.getAnnotationClass();
+
+        ParameterType<?, ?> out = selectByReturnType(parameterTypeMap, returnType, annotationClass, false);
+        if (out == null && useDefault) {
+            out = selectByReturnType(defaultSelector.parameterTypeMap, returnType, annotationClass, false);
+        }
+        if (out == null) {
+            out = selectByReturnType(parameterTypeMap, returnType, annotationClass, true);
+        }
+        if (out == null && useDefault) {
+            out = selectByReturnType(defaultSelector.parameterTypeMap, returnType, annotationClass, true);
+        }
+        return cast(out);
+    }
+
+    private static ParameterType<?, ?> selectByReturnType(Map<ParameterKey, ParameterType<?, ?>> map, Class<?> returnType,
+                                                          Class<? extends Annotation> annotationClass, boolean allowSubclass) {
+        ParameterType<?, ?> out = null;
+        if (allowSubclass) {
+            for (ParameterType<?, ?> type : map.values()) {
+                if (returnType.isAssignableFrom(type.getReturnType())) {
+                    if (annotationClass == type.getAnnotationClass()) {
+                        out = type;
+                        break;
+                    }
+                    if (out == null) {
+                        out = type;
+                    }
+                }
+            }
+        } else {
+            for (ParameterType<?, ?> type : map.values()) {
+                if (returnType == type.getReturnType()) {
+                    if (annotationClass == type.getAnnotationClass()) {
+                        out = type;
+                        break;
+                    }
+                    if (out == null) {
+                        out = type;
+                    }
+                }
+            }
+        }
+        return out;
+    }
+
+    private static <T> T cast(Object o) {
+        //noinspection unchecked
+        return (T) o;
+    }
+
+    @Override
+    public void addType(boolean infolessAlias, ParameterType<?, ?> type) {
+        parameterTypeMap.put(type.getTypeKey(), type);
+
+        if (infolessAlias) {
+            parameterTypeMap.putIfAbsent(type.getInfolessTypeKey(), type);
+        }
+    }
+
+    static {
+        // registers default parameter types
+        ParameterTypes.clinit();
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/NumberParameterType.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/NumberParameterType.java
new file mode 100644
index 0000000..ed53cb0
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/NumberParameterType.java
@@ -0,0 +1,55 @@
+package io.dico.dicore.command.parameter.type;
+
+import io.dico.dicore.command.CommandException;
+import io.dico.dicore.command.annotation.Range;
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.parameter.Parameter;
+import org.bukkit.command.CommandSender;
+
+/**
+ * Abstraction for number parameter types which use {@link Range.Memory} as parameter info.
+ *
+ * @param <T> the Number subclass.
+ */
+public abstract class NumberParameterType<T extends Number> extends ParameterType<T, Range.Memory> {
+
+    public NumberParameterType(Class<T> returnType) {
+        super(returnType, Range.CONFIG);
+    }
+
+    protected abstract T parse(String input) throws NumberFormatException;
+
+    protected abstract T select(Number number);
+
+    @Override
+    public T parse(Parameter<T, Range.Memory> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+        //System.out.println("In NumberParameterType:parse() for class " + getReturnType().toGenericString());
+
+        String input = buffer.next();
+        if (input == null) {
+            throw CommandException.missingArgument(parameter.getName());
+        }
+
+        T result;
+        try {
+            result = parse(input);
+        } catch (Exception ex) {
+            throw CommandException.invalidArgument(parameter.getName(), "a number");
+        }
+
+        Range.Memory memory = (Range.Memory) parameter.getParamInfo();
+        if (memory != null) {
+            memory.validate(result, "Argument " + parameter.getName() + " is out of range ["
+                    + select(memory.min()) + ", " + select(memory.max()) + "]: " + result);
+        }
+
+        return result;
+    }
+
+    @Override
+    public T getDefaultValue(Parameter<T, Range.Memory> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+        Range.Memory memory = (Range.Memory) parameter.getParamInfo();
+        return select(memory != null ? memory.defaultValue() : 0);
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterConfig.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterConfig.java
new file mode 100644
index 0000000..dbd7590
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterConfig.java
@@ -0,0 +1,80 @@
+package io.dico.dicore.command.parameter.type;
+
+import io.dico.dicore.Reflection;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Constructor;
+
+/**
+ * This class serves the purpose of having annotated parameter configurations (such as ranges for number parameters).
+ * Such configurations must be possible to obtain without using annotations, and as such, there should be a class conveying the information
+ * that is separate from the annotation itself. This class acts as a bridge from the annotation to said class conveying the information.
+ *
+ * @param <TAnnotation> the annotation type for parameters
+ * @param <TParamInfo>  the object type that holds the information required in memory
+ */
+public abstract class ParameterConfig<TAnnotation extends Annotation, TParamInfo> implements Comparable<ParameterConfig<?, ?>> {
+    private final Class<TAnnotation> annotationClass;
+    // protected final TParamInfo defaultValue;
+
+    public ParameterConfig(Class<TAnnotation> annotationClass/*, TParamInfo defaultValue*/) {
+        this.annotationClass = annotationClass;
+        //this.defaultValue = defaultValue;
+    }
+
+    public final Class<TAnnotation> getAnnotationClass() {
+        return annotationClass;
+    }
+    /*
+    public TParamInfo getDefaultValue() {
+        return defaultValue;
+    }*/
+
+    protected abstract TParamInfo toParameterInfo(TAnnotation annotation);
+
+    public TParamInfo getParameterInfo(Annotation annotation) {
+        //noinspection unchecked
+        return toParameterInfo((TAnnotation) annotation);
+    }
+
+    public static <TAnnotation extends Annotation, TParamInfo> ParameterConfig<TAnnotation, TParamInfo>
+    includeMemoryClass(Class<TAnnotation> annotationClass, Class<TParamInfo> memoryClass) {
+        Constructor<TParamInfo> constructor;
+        //TParamInfo defaultValue;
+        try {
+            constructor = memoryClass.getConstructor(annotationClass);
+            //defaultValue = Reflection.getStaticFieldValue(annotationClass, "DEFAULT");
+        } catch (NoSuchMethodException | IllegalArgumentException ex) {
+            throw new IllegalArgumentException(ex);
+        }
+        /*
+        if (defaultValue == null) try {
+            defaultValue = memoryClass.newInstance();
+        } catch (IllegalAccessException | InstantiationException ex) {
+            throw new IllegalArgumentException("Failed to get a default value for the param info", ex);
+        }*/
+
+        return new ParameterConfig<TAnnotation, TParamInfo>(annotationClass/*, defaultValue*/) {
+
+            @Override
+            public TParamInfo toParameterInfo(TAnnotation annotation) {
+                try {
+                    return constructor.newInstance(annotation);
+                } catch (Exception ex) {
+                    throw new RuntimeException(ex);
+                }
+            }
+        };
+    }
+
+    public static <TAnnotation extends Annotation, TParamInfo> ParameterConfig<TAnnotation, TParamInfo> getMemoryClassFromField(Class<TAnnotation> annotationClass) {
+        return ParameterConfig.includeMemoryClass(annotationClass, Reflection.getStaticFieldValue(annotationClass, "MEMORY_CLASS"));
+    }
+
+    @Override
+    public int compareTo(ParameterConfig<?, ?> o) {
+        return 0;
+    }
+
+}
+
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterKey.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterKey.java
new file mode 100644
index 0000000..67f86d4
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterKey.java
@@ -0,0 +1,46 @@
+package io.dico.dicore.command.parameter.type;
+
+import java.lang.annotation.Annotation;
+import java.util.Objects;
+
+/**
+ * More appropriate name: ParameterTypeKey
+ */
+public class ParameterKey {
+    private final Class<?> returnType;
+    private final Class<? extends Annotation> annotationClass;
+
+    public ParameterKey(Class<?> returnType) {
+        this(returnType, null);
+    }
+
+    public ParameterKey(Class<?> returnType, Class<? extends Annotation> annotationClass) {
+        this.returnType = Objects.requireNonNull(returnType);
+        this.annotationClass = annotationClass;
+    }
+
+    public Class<?> getReturnType() {
+        return returnType;
+    }
+
+    public Class<? extends Annotation> getAnnotationClass() {
+        return annotationClass;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        return this == o || (o instanceof ParameterKey && equals((ParameterKey) o));
+    }
+
+    public boolean equals(ParameterKey that) {
+        return returnType == that.returnType && annotationClass == that.annotationClass;
+    }
+
+    @Override
+    public int hashCode() {
+        int result = returnType.hashCode();
+        result = 31 * result + (annotationClass != null ? annotationClass.hashCode() : 0);
+        return result;
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterType.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterType.java
new file mode 100644
index 0000000..d89fd10
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterType.java
@@ -0,0 +1,201 @@
+package io.dico.dicore.command.parameter.type;
+
+import io.dico.dicore.Reflection;
+import io.dico.dicore.command.CommandException;
+import io.dico.dicore.command.ExecutionContext;
+import io.dico.dicore.command.annotation.Range;
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.parameter.Parameter;
+import org.bukkit.Location;
+import org.bukkit.command.CommandSender;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * A parameter type.
+ * Takes care of parsing, default values as well as completions.
+ *
+ * @param <TReturn>    type of the parameter
+ * @param <TParamInfo> the info object type for the parameter (Example: {@link Range.Memory}
+ */
+public abstract class ParameterType<TReturn, TParamInfo> {
+    private final Class<TReturn> returnType;
+    private final ParameterConfig<?, TParamInfo> parameterConfig;
+    protected final ParameterType<TReturn, TParamInfo> otherType; // flag or non-flag, depending on current
+
+    public ParameterType(Class<TReturn> returnType) {
+        this(returnType, null);
+    }
+
+    public ParameterType(Class<TReturn> returnType, ParameterConfig<?, TParamInfo> paramConfig) {
+        this.returnType = Objects.requireNonNull(returnType);
+        this.parameterConfig = paramConfig;
+
+        ParameterType<TReturn, TParamInfo> otherType = flagTypeParameter();
+        this.otherType = otherType == null ? this : otherType;
+    }
+
+    protected ParameterType(Class<TReturn> returnType, ParameterConfig<?, TParamInfo> parameterConfig, ParameterType<TReturn, TParamInfo> otherType) {
+        this.returnType = returnType;
+        this.parameterConfig = parameterConfig;
+        this.otherType = otherType;
+    }
+
+    public int getExpectedAmountOfConsumedArguments() {
+        return 1;
+    }
+
+    public boolean canBeFlag() {
+        return this == otherType;
+    }
+
+    public boolean isFlagExplicitly() {
+        return this instanceof FlagParameterType;
+    }
+
+    /**
+     * @return The return type
+     */
+    public final Class<TReturn> getReturnType() {
+        return returnType;
+    }
+
+    public final Class<?> getAnnotationClass() {
+        return parameterConfig == null ? null : parameterConfig.getAnnotationClass();
+    }
+
+    public final ParameterConfig<?, TParamInfo> getParameterConfig() {
+        return parameterConfig;
+    }
+
+    public ParameterKey getTypeKey() {
+        return new ParameterKey(returnType, parameterConfig != null ? parameterConfig.getAnnotationClass() : null);
+    }
+
+    public ParameterKey getInfolessTypeKey() {
+        return new ParameterKey(returnType, null);
+    }
+
+    protected FlagParameterType<TReturn, TParamInfo> flagTypeParameter() {
+        return null;
+    }
+
+    public ParameterType<TReturn, TParamInfo> asFlagParameter() {
+        return canBeFlag() ? this : otherType;
+    }
+
+    public ParameterType<TReturn, TParamInfo> asNormalParameter() {
+        return isFlagExplicitly() ? otherType : this;
+    }
+
+    public abstract TReturn parse(Parameter<TReturn, TParamInfo> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException;
+
+    public TReturn parseForContext(Parameter<TReturn, TParamInfo> parameter, ExecutionContext context, ArgumentBuffer buffer) throws CommandException {
+        return parse(parameter, context.getSender(), buffer);
+    }
+
+    public TReturn getDefaultValue(Parameter<TReturn, TParamInfo> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+        return null;
+    }
+
+    public TReturn getDefaultValueForContext(Parameter<TReturn, TParamInfo> parameter, ExecutionContext context, ArgumentBuffer buffer) throws CommandException {
+        return getDefaultValue(parameter, context.getSender(), buffer);
+    }
+
+    public List<String> complete(Parameter<TReturn, TParamInfo> parameter, CommandSender sender, Location location, ArgumentBuffer buffer) {
+        return Collections.emptyList();
+    }
+
+    public List<String> completeForContext(Parameter<TReturn, TParamInfo> parameter, ExecutionContext context, Location location, ArgumentBuffer buffer) {
+        return complete(parameter, context.getSender(), location, buffer);
+    }
+
+    protected static abstract class FlagParameterType<TResult, TParamInfo> extends ParameterType<TResult, TParamInfo> {
+
+        protected FlagParameterType(ParameterType<TResult, TParamInfo> otherType) {
+            super(otherType.returnType, otherType.parameterConfig, otherType);
+        }
+
+        @Override
+        public int getExpectedAmountOfConsumedArguments() {
+            return otherType.getExpectedAmountOfConsumedArguments();
+        }
+
+        @Override
+        public boolean canBeFlag() {
+            return true;
+        }
+
+        @Override
+        protected final FlagParameterType<TResult, TParamInfo> flagTypeParameter() {
+            return this;
+        }
+
+        @Override
+        public ParameterType<TResult, TParamInfo> asFlagParameter() {
+            return this;
+        }
+
+        @Override
+        public ParameterType<TResult, TParamInfo> asNormalParameter() {
+            return otherType;
+        }
+
+    }
+
+    public @interface Reference {
+
+        /**
+         * The path to the static field holding the parameter type referred.
+         *
+         * @return The path
+         */
+        String value();
+    }
+
+    public static class ReferenceUtil {
+
+        private ReferenceUtil() {
+
+        }
+
+
+        /**
+         * Get the ParameterType with the associated Reference
+         *
+         * @param ref the reference
+         * @return the parameter type object
+         * @throws IllegalArgumentException if the class is found, but the field doesn't exist.
+         * @throws IllegalStateException    if this method fails to find the object for any other reason
+         */
+        public static Object getReference(Reference ref) {
+            String[] path = ref.value().split("\\.");
+            if (path.length < 2) {
+                throw new IllegalStateException();
+            }
+
+            String fieldName = path[path.length - 1];
+            String className = String.join(".", Arrays.copyOfRange(path, 0, path.length - 1));
+
+            Class<?> clazz;
+            try {
+                clazz = Class.forName(className);
+            } catch (ClassNotFoundException ex) {
+                throw new IllegalArgumentException(ex);
+            }
+
+            Object result = Reflection.getStaticFieldValue(clazz, fieldName);
+
+            if (result == null) {
+                throw new IllegalStateException();
+            }
+
+            return result;
+        }
+
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterTypes.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterTypes.java
new file mode 100644
index 0000000..98b7b77
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/ParameterTypes.java
@@ -0,0 +1,272 @@
+package io.dico.dicore.command.parameter.type;
+
+import io.dico.dicore.command.CommandException;
+import io.dico.dicore.command.Validate;
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.parameter.Parameter;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Locale;
+
+/**
+ * Class providing default parameter types
+ */
+public class ParameterTypes {
+
+    public static IParameterTypeSelector getSelector() {
+        return MapBasedParameterTypeSelector.defaultSelector;
+    }
+
+    private static <T> T registerType(boolean infolessAlias, T obj) {
+        getSelector().addType(infolessAlias, (ParameterType<?, ?>) obj);
+        return obj;
+    }
+
+    static void clinit() {
+        // initializes class
+    }
+
+    public static final ParameterType<String, Void> STRING;
+    public static final ParameterType<Boolean, Void> BOOLEAN;
+    public static final NumberParameterType<Double> DOUBLE;
+    public static final NumberParameterType<Integer> INTEGER;
+    public static final NumberParameterType<Long> LONG;
+    public static final NumberParameterType<Short> SHORT;
+    public static final NumberParameterType<Float> FLOAT;
+    public static final ParameterType<Player, Void> PLAYER;
+    public static final ParameterType<OfflinePlayer, Void> OFFLINE_PLAYER;
+    //public static final ParameterType<Boolean, Void> PRESENCE;
+    //public static final NumberParameterType<BigDecimal> BIG_DECIMAL;
+    //public static final NumberParameterType<BigInteger> BIG_INTEGER;
+
+    private ParameterTypes() {
+
+    }
+
+    static {
+        STRING = registerType(false, new SimpleParameterType<String, Void>(String.class) {
+            @Override
+            protected String parse(Parameter<String, Void> parameter, CommandSender sender, String input) throws CommandException {
+                return input;
+            }
+
+            @Override
+            public String getDefaultValue(Parameter<String, Void> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+                return "";
+            }
+        });
+
+        BOOLEAN = registerType(true, new ParameterType<Boolean, Void>(Boolean.TYPE) {
+            @Override
+            public Boolean parse(Parameter<Boolean, Void> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+                String input = buffer.requireNext(parameter.getName());
+                switch (input.toLowerCase()) {
+                    case "true":
+                    case "yes":
+                        return true;
+                    case "false":
+                    case "no":
+                        return false;
+                    default:
+                        throw CommandException.invalidArgument(parameter.getName(), "true, false, yes or no");
+                }
+            }
+
+            @Override
+            public Boolean getDefaultValue(Parameter<Boolean, Void> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+                return false;
+            }
+
+            @Override
+            public List<String> complete(Parameter<Boolean, Void> parameter, CommandSender sender, Location location, ArgumentBuffer buffer) {
+                String input = buffer.next();
+                if (input != null) {
+                    List<String> result = new ArrayList<>(1);
+                    input = input.toLowerCase();
+                    for (String value : new String[]{"true", "yes", "false", "no"}) {
+                        if (value.startsWith(input)) {
+                            result.add(value);
+                        }
+                    }
+                    return result;
+                }
+                return Arrays.asList("true", "yes", "false", "no");
+            }
+
+            @Override
+            protected FlagParameterType<Boolean, Void> flagTypeParameter() {
+                return new FlagParameterType<Boolean, Void>(this) {
+                    @Override
+                    public Boolean parse(Parameter<Boolean, Void> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+                        return true;
+                    }
+
+                    @Override
+                    public Boolean getDefaultValue(Parameter<Boolean, Void> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+                        return false;
+                    }
+
+                    @Override
+                    public int getExpectedAmountOfConsumedArguments() {
+                        return 0;
+                    }
+                };
+            }
+        });
+
+        INTEGER = registerType(true, new NumberParameterType<Integer>(Integer.TYPE) {
+            @Override
+            protected Integer parse(String input) throws NumberFormatException {
+                return Integer.parseInt(input);
+            }
+
+            @Override
+            protected Integer select(Number number) {
+                return number.intValue();
+            }
+        });
+
+        DOUBLE = registerType(true, new NumberParameterType<Double>(Double.TYPE) {
+            @Override
+            protected Double parse(String input) throws NumberFormatException {
+                return Double.parseDouble(input);
+            }
+
+            @Override
+            protected Double select(Number number) {
+                return number.doubleValue();
+            }
+        });
+
+        LONG = registerType(true, new NumberParameterType<Long>(Long.TYPE) {
+            @Override
+            protected Long parse(String input) throws NumberFormatException {
+                return Long.parseLong(input);
+            }
+
+            @Override
+            protected Long select(Number number) {
+                return number.longValue();
+            }
+        });
+
+        SHORT = registerType(true, new NumberParameterType<Short>(Short.TYPE) {
+            @Override
+            protected Short parse(String input) throws NumberFormatException {
+                return Short.parseShort(input);
+            }
+
+            @Override
+            protected Short select(Number number) {
+                return number.shortValue();
+            }
+        });
+
+        FLOAT = registerType(true, new NumberParameterType<Float>(Float.TYPE) {
+            @Override
+            protected Float parse(String input) throws NumberFormatException {
+                return Float.parseFloat(input);
+            }
+
+            @Override
+            protected Float select(Number number) {
+                return number.floatValue();
+            }
+        });
+
+        PLAYER = registerType(true, new SimpleParameterType<Player, Void>(Player.class) {
+            @Override
+            protected Player parse(Parameter<Player, Void> parameter, CommandSender sender, String input) throws CommandException {
+                //System.out.println("In ParameterTypes#PLAYER.parse()");
+                Player player = Bukkit.getPlayer(input);
+                Validate.notNull(player, "A player by the name '" + input + "' could not be found");
+                return player;
+            }
+
+            @Override
+            public List<String> complete(Parameter<Player, Void> parameter, CommandSender sender, Location location, ArgumentBuffer buffer) {
+                String input = buffer.nextOrEmpty().toLowerCase();
+                List<String> result = new ArrayList<>();
+                for (Player player : Bukkit.getOnlinePlayers()) {
+                    if (player.getName().toLowerCase().startsWith(input)) {
+                        result.add(player.getName());
+                    }
+                }
+                return result;
+            }
+        });
+
+        OFFLINE_PLAYER = registerType(true, new SimpleParameterType<OfflinePlayer, Void>(OfflinePlayer.class) {
+            @Override
+            protected OfflinePlayer parse(Parameter<OfflinePlayer, Void> parameter, CommandSender sender, String input) throws CommandException {
+                OfflinePlayer result = Bukkit.getPlayer(input);
+                if (result != null) {
+                    return result;
+                }
+
+                input = input.toLowerCase(Locale.ROOT);
+                for (OfflinePlayer offlinePlayer : Bukkit.getOfflinePlayers()) {
+                    if (offlinePlayer.getName().toLowerCase(Locale.ROOT).startsWith(input)) {
+                        return offlinePlayer;
+                    }
+                }
+
+                throw new CommandException("An offline player by the name '" + input + "' could not be found");
+            }
+
+            @Override
+            public List<String> complete(Parameter<OfflinePlayer, Void> parameter, CommandSender sender, Location location, ArgumentBuffer buffer) {
+                String input = buffer.nextOrEmpty().toLowerCase();
+                ArrayList<String> result = new ArrayList<>();
+                for (OfflinePlayer player : Bukkit.getOfflinePlayers()) {
+                    if (player.getName().toLowerCase().startsWith(input)) {
+                        if (player.isOnline()) {
+                            result.add(0, player.getName());
+                        } else {
+                            result.add(player.getName());
+                        }
+                    }
+                }
+                return result;
+            }
+        });
+        
+        /*
+        PRESENCE = registerType(false, new ParameterType<Boolean, Void>(Boolean.class) {
+            @Override
+            public Boolean parse(IParameter<Boolean, Void> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+                return null;
+            }
+    
+            @Override
+            protected FlagParameterType<Boolean, Void> flagTypeParameter() {
+                return new FlagParameterType<Boolean, Void>(this) {
+                    @Override
+                    public Boolean parse(IParameter<Boolean, Void> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+                        return true;
+                    }
+    
+                    @Override
+                    public Boolean getDefaultValue(IParameter<Boolean, Void> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+                        return false;
+                    }
+    
+                    @Override
+                    public int getExpectedAmountOfConsumedArguments() {
+                        return 0;
+                    }
+                };
+            }
+        });
+        */
+
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/SimpleParameterType.java b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/SimpleParameterType.java
new file mode 100644
index 0000000..ecf19ce
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/parameter/type/SimpleParameterType.java
@@ -0,0 +1,31 @@
+package io.dico.dicore.command.parameter.type;
+
+import io.dico.dicore.command.CommandException;
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.parameter.Parameter;
+import org.bukkit.command.CommandSender;
+
+/**
+ * An abstraction for parameter types that only parse a single argument
+ *
+ * @param <TReturn>    the parameter type
+ * @param <TParamInfo> parameter info object type
+ */
+public abstract class SimpleParameterType<TReturn, TParamInfo> extends ParameterType<TReturn, TParamInfo> {
+
+    public SimpleParameterType(Class<TReturn> returnType) {
+        super(returnType);
+    }
+
+    public SimpleParameterType(Class<TReturn> returnType, ParameterConfig<?, TParamInfo> paramConfig) {
+        super(returnType, paramConfig);
+    }
+
+    protected abstract TReturn parse(Parameter<TReturn, TParamInfo> parameter, CommandSender sender, String input) throws CommandException;
+
+    @Override
+    public TReturn parse(Parameter<TReturn, TParamInfo> parameter, CommandSender sender, ArgumentBuffer buffer) throws CommandException {
+        return parse(parameter, sender, buffer.requireNext(parameter.getName()));
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/predef/HelpCommand.java b/dicore3/command/src/main/java/io/dico/dicore/command/predef/HelpCommand.java
new file mode 100644
index 0000000..cadf4ae
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/predef/HelpCommand.java
@@ -0,0 +1,76 @@
+package io.dico.dicore.command.predef;
+
+import io.dico.dicore.command.*;
+import io.dico.dicore.command.annotation.Range;
+import io.dico.dicore.command.parameter.ArgumentBuffer;
+import io.dico.dicore.command.parameter.Parameter;
+import io.dico.dicore.command.parameter.type.NumberParameterType;
+import org.bukkit.command.CommandSender;
+
+/**
+ * The help command
+ */
+public class HelpCommand extends PredefinedCommand<HelpCommand> {
+    private static final Parameter<Integer, Range.Memory> pageParameter;
+    public static final HelpCommand INSTANCE;
+
+    private HelpCommand(boolean modifiable) {
+        super(modifiable);
+        getParameterList().addParameter(pageParameter);
+        getParameterList().setRequiredCount(0);
+        setDescription("Shows this help page");
+    }
+
+    @Override
+    protected HelpCommand newModifiableInstance() {
+        return new HelpCommand(true);
+    }
+
+    @Override
+    public String execute(CommandSender sender, ExecutionContext context) throws CommandException {
+        ICommandAddress target = context.getAddress();
+        if (context.getAddress().getCommand() == this) {
+            target = target.getParent();
+        }
+
+        context.getAddress().getChatController().sendHelpMessage(sender, context, target, context.<Integer>get("page") - 1);
+        return null;
+    }
+
+    public static void registerAsChild(ICommandAddress address) {
+        registerAsChild(address, "help");
+    }
+
+    public static void registerAsChild(ICommandAddress address, String main, String... aliases) {
+        ((ModifiableCommandAddress) address).addChild(new ChildCommandAddress(INSTANCE, main, aliases));
+    }
+
+    static {
+        pageParameter = new Parameter<>("page", "the page number",
+                new NumberParameterType<Integer>(Integer.TYPE) {
+                    @Override
+                    protected Integer parse(String input) throws NumberFormatException {
+                        return Integer.parseInt(input);
+                    }
+
+                    @Override
+                    protected Integer select(Number number) {
+                        return number.intValue();
+                    }
+
+                    @Override
+                    public Integer parseForContext(Parameter<Integer, Range.Memory> parameter, ExecutionContext context, ArgumentBuffer buffer) throws CommandException {
+                        if (context.getAddress().getCommand() == null || context.getAddress().getCommand().getClass() != HelpCommand.class) {
+                            // An address was executed with its help command as target
+                            buffer.next();
+                            return 1;
+                        }
+                        return parse(parameter, context.getSender(), buffer);
+                    }
+                },
+                new Range.Memory(1, Integer.MAX_VALUE, 1));
+
+        INSTANCE = new HelpCommand(false);
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/predef/PredefinedCommand.java b/dicore3/command/src/main/java/io/dico/dicore/command/predef/PredefinedCommand.java
new file mode 100644
index 0000000..4e7ba07
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/predef/PredefinedCommand.java
@@ -0,0 +1,49 @@
+package io.dico.dicore.command.predef;
+
+import io.dico.dicore.command.CommandBuilder;
+import io.dico.dicore.command.ExtendedCommand;
+import io.dico.dicore.command.ICommandAddress;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Consumer;
+
+/**
+ * Marker class for commands that are generated. These commands can be replaced using methods in {@link CommandBuilder}
+ */
+public abstract class PredefinedCommand<T extends PredefinedCommand<T>> extends ExtendedCommand<T> {
+    static final Map<String, Consumer<ICommandAddress>> predefinedCommandGenerators = new HashMap<>();
+
+    /**
+     * Get a predefined command
+     *
+     * @param name the name
+     * @return the subscriber
+     */
+    public static Consumer<ICommandAddress> getPredefinedCommandGenerator(String name) {
+        return predefinedCommandGenerators.get(name);
+    }
+
+    /**
+     * Register a predefined command
+     *
+     * @param name     the name
+     * @param consumer the generator which adds the child to the address
+     * @return true if and only if the subscriber was registered (false if the name exists)
+     */
+    public static boolean registerPredefinedCommandGenerator(String name, Consumer<ICommandAddress> consumer) {
+        return predefinedCommandGenerators.putIfAbsent(name, consumer) == null;
+    }
+
+    static {
+        registerPredefinedCommandGenerator("help", HelpCommand::registerAsChild);
+        registerPredefinedCommandGenerator("syntax", SyntaxCommand::registerAsChild);
+    }
+
+    public PredefinedCommand() {
+    }
+
+    public PredefinedCommand(boolean modifiable) {
+        super(modifiable);
+    }
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/predef/SyntaxCommand.java b/dicore3/command/src/main/java/io/dico/dicore/command/predef/SyntaxCommand.java
new file mode 100644
index 0000000..4f26a7b
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/predef/SyntaxCommand.java
@@ -0,0 +1,36 @@
+package io.dico.dicore.command.predef;
+
+import io.dico.dicore.command.*;
+import org.bukkit.command.CommandSender;
+
+/**
+ * The syntax command
+ */
+public class SyntaxCommand extends PredefinedCommand<SyntaxCommand> {
+    public static final SyntaxCommand INSTANCE = new SyntaxCommand(false);
+
+    private SyntaxCommand(boolean modifiable) {
+        super(modifiable);
+        setDescription("Describes how to use the command");
+    }
+
+    @Override
+    protected SyntaxCommand newModifiableInstance() {
+        return new SyntaxCommand(true);
+    }
+
+    @Override
+    public String execute(CommandSender sender, ExecutionContext context) throws CommandException {
+        context.getAddress().getChatController().sendSyntaxMessage(sender, context, context.getAddress().getParent());
+        return null;
+    }
+
+    public static void registerAsChild(ICommandAddress address) {
+        registerAsChild(address, "syntax");
+    }
+
+    public static void registerAsChild(ICommandAddress address, String main, String... aliases) {
+        ((ModifiableCommandAddress) address).addChild(new ChildCommandAddress(INSTANCE, main, aliases));
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/registration/BukkitCommand.java b/dicore3/command/src/main/java/io/dico/dicore/command/registration/BukkitCommand.java
new file mode 100644
index 0000000..b5346d0
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/registration/BukkitCommand.java
@@ -0,0 +1,122 @@
+package io.dico.dicore.command.registration;
+
+import io.dico.dicore.command.ICommandAddress;
+import io.dico.dicore.command.ICommandDispatcher;
+import org.bukkit.Location;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.List;
+
+/**
+ * This class extends the bukkit's command class.
+ * Instances are injected into the command map.
+ */
+public class BukkitCommand extends Command {
+    private ICommandDispatcher dispatcher;
+    private ICommandAddress origin;
+
+    public BukkitCommand(ICommandAddress address) {
+        super(validateTree(address).getNames().get(0), "", "", address.getNames().subList(1, address.getNames().size()));
+        this.dispatcher = address.getDispatcherForTree();
+        this.origin = address;
+
+        setTimingsIfNecessary(this);
+    }
+
+    private static ICommandAddress validateTree(ICommandAddress tree) {
+        if (!tree.hasParent()) {
+            throw new IllegalArgumentException();
+        }
+        if (tree.getNames().isEmpty()) {
+            throw new IllegalArgumentException();
+        }
+        return tree;
+    }
+
+    public ICommandAddress getOrigin() {
+        return origin;
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String label, String[] args) {
+        if (!dispatcher.dispatchCommand(sender, label, args)) {
+            //System.out.println("failed to dispatch command");
+            // target command not found, send a message in the future TODO
+        }
+        return true;
+    }
+
+    @Override
+    public List<String> tabComplete(CommandSender sender, String alias, String[] args) throws IllegalArgumentException {
+        return this.tabComplete(sender, alias, args, null);
+    }
+
+    //@Override
+    public List<String> tabComplete(CommandSender sender, String alias, String[] args, Location location) throws IllegalArgumentException {
+        return dispatcher.getTabCompletions(sender, alias, location, args);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        BukkitCommand that = (BukkitCommand) o;
+
+        return getName().equals(that.getName()) && dispatcher == that.dispatcher;
+    }
+
+    @Override
+    public int hashCode() {
+        return dispatcher.hashCode() | getName().hashCode();
+    }
+
+    private static void setTimingsIfNecessary(Command object) {
+        // with paper spigot, the timings are not set by super constructor but by CommandMap.register(), which is not invoked for this system
+        // I use reflection so that the project does not require paper spigot to build
+        try {
+            // public field
+            Field field = Command.class.getDeclaredField("timings");
+            if (field.get(object) != null) return;
+            Class<?> clazz = Class.forName("co.aikar.timings.TimingsManager");
+            // public method
+            Method method = clazz.getDeclaredMethod("getCommandTiming", String.class, Command.class);
+            Object timings = method.invoke(null, "", object);
+            field.set(object, timings);
+        } catch (Throwable ignored) {
+        }
+    }
+    
+    /*
+    public static void registerToMap(ICommandAddress tree, Map<String, Command> map) {
+        BukkitCommand command = new BukkitCommand(tree);
+        Iterator<String> iterator = tree.getNames().iterator();
+        map.put(iterator.next(), command);
+        while (iterator.hasNext()) {
+            map.putIfAbsent(iterator.next(), command);
+        }
+    }
+    
+    public static void unregisterFromMap(ICommandAddress tree, Map<String, Command> map) {
+        map.values().remove(new BukkitCommand(tree));
+    }
+    
+    public static void registerChildrenToMap(ICommandAddress tree, Map<String, Command> map) {
+        for (Map.Entry<String, ? extends ICommandAddress> entry : tree.getChildren().entrySet()) {
+            ICommandAddress child = entry.getValue();
+            registerToMap(child, map);
+        }
+    }
+    
+    public static void unregisterChildenFromMap(ICommandAddress tree, Map<String, Command> map) {
+        for (Map.Entry<String, ? extends ICommandAddress> entry : tree.getChildren().entrySet()) {
+            ICommandAddress child = entry.getValue();
+            unregisterFromMap(child, map);
+        }
+    }
+    */
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/registration/CommandMap.java b/dicore3/command/src/main/java/io/dico/dicore/command/registration/CommandMap.java
new file mode 100644
index 0000000..780ec66
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/registration/CommandMap.java
@@ -0,0 +1,59 @@
+package io.dico.dicore.command.registration;
+
+import io.dico.dicore.Reflection;
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.SimpleCommandMap;
+import org.bukkit.plugin.SimplePluginManager;
+
+import java.util.*;
+
+/**
+ * Provides access to bukkit's {@code Map<String, org.bukkit.command.Command>} command map.
+ */
+@SuppressWarnings("ConstantConditions")
+public class CommandMap {
+    private static final Map<String, Command> commandMap = findCommandMap();
+
+    private CommandMap() {
+
+    }
+
+    public static Map<String, Command> getCommandMap() {
+        return Objects.requireNonNull(commandMap);
+    }
+
+    public static boolean isAvailable() {
+        return commandMap != null;
+    }
+
+    public static Command get(String key) {
+        return commandMap.get(key);
+    }
+
+    public static void put(String key, Command command) {
+        commandMap.put(key, command);
+    }
+
+    public static Collection<String> replace(Command command, Command replacement) {
+        List<String> result = new ArrayList<>();
+        for (Map.Entry<String, Command> entry : commandMap.entrySet()) {
+            if (entry.getValue() == command) {
+                entry.setValue(replacement);
+                result.add(entry.getKey());
+            }
+        }
+        return result;
+    }
+
+    private static Map<String, Command> findCommandMap() {
+        try {
+            return Reflection.getFieldValue(SimpleCommandMap.class, "knownCommands",
+                    Reflection.getFieldValue(SimplePluginManager.class, "commandMap", Bukkit.getPluginManager()));
+        } catch (Exception ex) {
+            ex.printStackTrace();
+            return null;
+        }
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/registration/reflect/CommandParseException.java b/dicore3/command/src/main/java/io/dico/dicore/command/registration/reflect/CommandParseException.java
new file mode 100644
index 0000000..478c70c
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/registration/reflect/CommandParseException.java
@@ -0,0 +1,27 @@
+package io.dico.dicore.command.registration.reflect;
+
+/**
+ * Thrown if an error occurs while 'parsing' a reflection command method
+ * Other errors can be thrown too in there that may not be directly relevant to a parsing error.
+ */
+public class CommandParseException extends Exception {
+
+    public CommandParseException() {
+    }
+
+    public CommandParseException(String message) {
+        super(message);
+    }
+
+    public CommandParseException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    public CommandParseException(Throwable cause) {
+        super(cause);
+    }
+
+    public CommandParseException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {
+        super(message, cause, enableSuppression, writableStackTrace);
+    }
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/registration/reflect/ReflectiveCommand.java b/dicore3/command/src/main/java/io/dico/dicore/command/registration/reflect/ReflectiveCommand.java
new file mode 100644
index 0000000..f033d9e
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/registration/reflect/ReflectiveCommand.java
@@ -0,0 +1,124 @@
+package io.dico.dicore.command.registration.reflect;
+
+import io.dico.dicore.command.*;
+import io.dico.dicore.command.annotation.Cmd;
+import io.dico.dicore.command.annotation.GenerateCommands;
+import io.dico.dicore.command.parameter.type.IParameterTypeSelector;
+import org.bukkit.command.CommandSender;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+
+final class ReflectiveCommand extends Command {
+    private final Method method;
+    private final Object instance;
+    private String[] parameterOrder;
+    private final int flags;
+
+    ReflectiveCommand(IParameterTypeSelector selector, Method method, Object instance) throws CommandParseException {
+        if (!method.isAnnotationPresent(Cmd.class)) {
+            throw new CommandParseException("No @Cmd present for the method " + method.toGenericString());
+        }
+
+        java.lang.reflect.Parameter[] parameters = method.getParameters();
+
+        if (!method.isAccessible()) try {
+            method.setAccessible(true);
+        } catch (Exception ex) {
+            throw new CommandParseException("Failed to make method accessible");
+        }
+
+        if (!Modifier.isStatic(method.getModifiers())) {
+            if (instance == null) {
+                try {
+                    instance = method.getDeclaringClass().newInstance();
+                } catch (Exception ex) {
+                    throw new CommandParseException("No instance given for instance method, and failed to create new instance", ex);
+                }
+            } else if (!method.getDeclaringClass().isInstance(instance)) {
+                throw new CommandParseException("Given instance is not an instance of the method's declaring class");
+            }
+        }
+
+        this.method = method;
+        this.instance = instance;
+        this.flags = ReflectiveRegistration.parseCommandAttributes(selector, method, this, parameters);
+    }
+
+    void setParameterOrder(String[] parameterOrder) {
+        this.parameterOrder = parameterOrder;
+    }
+
+    ICommandAddress getAddress() {
+        ChildCommandAddress result = new ChildCommandAddress();
+        result.setCommand(this);
+
+        Cmd cmd = method.getAnnotation(Cmd.class);
+        result.getNames().add(cmd.value());
+        for (String alias : cmd.aliases()) {
+            result.getNames().add(alias);
+        }
+        result.finalizeNames();
+
+        GenerateCommands generateCommands = method.getAnnotation(GenerateCommands.class);
+        if (generateCommands != null) {
+            ReflectiveRegistration.generateCommands(result, generateCommands.value());
+        }
+
+        return result;
+    }
+
+    @Override
+    public String execute(CommandSender sender, ExecutionContext context) throws CommandException {
+        //System.out.println("In ReflectiveCommand.execute()");
+
+        String[] parameterOrder = this.parameterOrder;
+        int start = Integer.bitCount(flags);
+        //System.out.println("start = " + start);
+        Object[] args = new Object[parameterOrder.length + start];
+
+        int i = 0;
+        if ((flags & 1) != 0) {
+            args[i++] = sender;
+        }
+        if ((flags & 2) != 0) {
+            args[i++] = context;
+        }
+        //System.out.println("i = " + i);
+        //System.out.println("parameterOrder = " + Arrays.toString(parameterOrder));
+
+        for (int n = args.length; i < n; i++) {
+            //System.out.println("n = " + n);
+            args[i] = context.get(parameterOrder[i - start]);
+            //System.out.println("context.get(parameterOrder[i - start]) = " + context.get(parameterOrder[i - start]));
+            //System.out.println("context.get(parameterOrder[i - start]).getClass() = " + context.get(parameterOrder[i - start]).getClass());
+        }
+
+        //System.out.println("args = " + Arrays.toString(args));
+
+        Object result;
+        try {
+            result = method.invoke(instance, args);
+        } catch (InvocationTargetException ex) {
+            if (ex.getCause() instanceof CommandException) {
+                throw (CommandException) ex.getCause();
+            }
+
+            ex.printStackTrace();
+            throw new CommandException("An internal error occurred while executing this command.", ex);
+        } catch (Exception ex) {
+            ex.printStackTrace();
+            throw new CommandException("An internal error occurred while executing this command.", ex);
+        }
+
+        if (result instanceof String) {
+            return (String) result;
+        }
+        if (result instanceof CommandResult) {
+            return ((CommandResult) result).getMessage();
+        }
+        return null;
+    }
+
+}
diff --git a/dicore3/command/src/main/java/io/dico/dicore/command/registration/reflect/ReflectiveRegistration.java b/dicore3/command/src/main/java/io/dico/dicore/command/registration/reflect/ReflectiveRegistration.java
new file mode 100644
index 0000000..84bb10b
--- /dev/null
+++ b/dicore3/command/src/main/java/io/dico/dicore/command/registration/reflect/ReflectiveRegistration.java
@@ -0,0 +1,385 @@
+package io.dico.dicore.command.registration.reflect;
+
+import io.dico.dicore.command.*;
+import io.dico.dicore.command.annotation.*;
+import io.dico.dicore.command.annotation.GroupMatchedCommands.GroupEntry;
+import io.dico.dicore.command.parameter.IArgumentPreProcessor;
+import io.dico.dicore.command.parameter.Parameter;
+import io.dico.dicore.command.parameter.ParameterList;
+import io.dico.dicore.command.parameter.type.IParameterTypeSelector;
+import io.dico.dicore.command.parameter.type.MapBasedParameterTypeSelector;
+import io.dico.dicore.command.parameter.type.ParameterType;
+import io.dico.dicore.command.parameter.type.ParameterTypes;
+import io.dico.dicore.command.predef.PredefinedCommand;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.ConsoleCommandSender;
+import org.bukkit.entity.Player;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Method;
+import java.lang.reflect.Modifier;
+import java.util.*;
+import java.util.function.Consumer;
+import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
+
+/**
+ * Takes care of turning a reflection {@link Method} into a command and more.
+ */
+public class ReflectiveRegistration {
+    /**
+     * This object provides names of the parameters.
+     * Oddly, the AnnotationParanamer extensions require a 'fallback' paranamer to function properly without
+     * requiring ALL parameters to have that flag. This is weird because it should just use the AdaptiveParanamer on an upper level to
+     * determine the name of each individual flag. Oddly this isn't how it works, so the fallback works the same way as the AdaptiveParanamer does.
+     * It's just linked instead of using an array for that part. Then we can use an AdaptiveParanamer for the latest fallback, to get bytecode names
+     * or, finally, to get the Jvm-provided parameter names.
+     */
+    //private static final Paranamer paranamer = new CachingParanamer(new BytecodeReadingParanamer());
+    @SuppressWarnings("StatementWithEmptyBody")
+    private static String[] lookupParameterNames(Method method, java.lang.reflect.Parameter[] parameters, int start) {
+        int n = parameters.length;
+        String[] out = new String[n - start];
+
+        //String[] bytecode;
+        //try {
+        //    bytecode = paranamer.lookupParameterNames(method, false);
+        //} catch (Exception ex) {
+        //    bytecode = new String[0];
+        //    System.err.println("ReflectiveRegistration.lookupParameterNames failed to read bytecode");
+        //    //ex.printStackTrace();
+        //}
+        //int bn = bytecode.length;
+
+        for (int i = start; i < n; i++) {
+            java.lang.reflect.Parameter parameter = parameters[i];
+            Flag flag = parameter.getAnnotation(Flag.class);
+            NamedArg namedArg = parameter.getAnnotation(NamedArg.class);
+
+            boolean isFlag = flag != null;
+            String name;
+            if (namedArg != null && !(name = namedArg.value()).isEmpty()) {
+            } else if (isFlag && !(name = flag.value()).isEmpty()) {
+                //} else if (i < bn && (name = bytecode[i]) != null && !name.isEmpty()) {
+            } else {
+                name = parameter.getName();
+            }
+
+            if (isFlag) {
+                name = '-' + name;
+            } else {
+                int idx = 0;
+                while (name.startsWith("-", idx)) {
+                    idx++;
+                }
+                name = name.substring(idx);
+            }
+
+            out[i - start] = name;
+        }
+
+        return out;
+    }
+
+    public static void parseCommandGroup(ICommandAddress address, Class<?> clazz, Object instance) throws CommandParseException {
+        parseCommandGroup(address, ParameterTypes.getSelector(), clazz, instance);
+    }
+
+    public static void parseCommandGroup(ICommandAddress address, IParameterTypeSelector selector, Class<?> clazz, Object instance) throws CommandParseException {
+        boolean requireStatic = instance == null;
+        if (!requireStatic && !clazz.isInstance(instance)) {
+            throw new CommandParseException();
+        }
+
+        List<Method> methods = new LinkedList<>(Arrays.asList(clazz.getDeclaredMethods()));
+
+        Iterator<Method> it = methods.iterator();
+        for (Method method; it.hasNext(); ) {
+            method = it.next();
+
+            if (requireStatic && !Modifier.isStatic(method.getModifiers())) {
+                it.remove();
+                continue;
+            }
+
+            if (method.isAnnotationPresent(CmdParamType.class)) {
+                it.remove();
+
+                if (method.getReturnType() != ParameterType.class || method.getParameterCount() != 0) {
+                    throw new CommandParseException("Invalid CmdParamType method: must return ParameterType and take no arguments");
+                }
+
+                ParameterType<?, ?> type;
+                try {
+                    Object inst = Modifier.isStatic(method.getModifiers()) ? null : instance;
+                    type = (ParameterType<?, ?>) method.invoke(inst);
+                    Objects.requireNonNull(type, "ParameterType returned is null");
+                } catch (Exception ex) {
+                    throw new CommandParseException("Error occurred whilst getting ParameterType from CmdParamType method '" + method.toGenericString() + "'", ex);
+                }
+
+                if (selector == ParameterTypes.getSelector()) {
+                    selector = new MapBasedParameterTypeSelector(true);
+                }
+
+                selector.addType(method.getAnnotation(CmdParamType.class).infolessAlias(), type);
+            }
+        }
+
+        GroupMatcherCache groupMatcherCache = new GroupMatcherCache(clazz, address);
+        for (Method method : methods) {
+            if (method.isAnnotationPresent(Cmd.class)) {
+                ICommandAddress parsed = parseCommandMethod(selector, method, instance);
+                groupMatcherCache.getGroupFor(method).addChild(parsed);
+            }
+        }
+
+    }
+
+    private static final class GroupMatcherCache {
+        private ModifiableCommandAddress groupRootAddress;
+        private GroupEntry[] matchEntries;
+        private Pattern[] patterns;
+        private ModifiableCommandAddress[] addresses;
+
+        GroupMatcherCache(Class<?> clazz, ICommandAddress groupRootAddress) throws CommandParseException {
+            this.groupRootAddress = (ModifiableCommandAddress) groupRootAddress;
+
+            GroupMatchedCommands groupMatchedCommands = clazz.getAnnotation(GroupMatchedCommands.class);
+            GroupEntry[] matchEntries = groupMatchedCommands == null ? new GroupEntry[0] : groupMatchedCommands.value();
+
+            Pattern[] patterns = new Pattern[matchEntries.length];
+            for (int i = 0; i < matchEntries.length; i++) {
+                GroupEntry matchEntry = matchEntries[i];
+                if (matchEntry.group().isEmpty() || matchEntry.regex().isEmpty()) {
+                    throw new CommandParseException("Empty group or regex in GroupMatchedCommands entry");
+                }
+                try {
+                    patterns[i] = Pattern.compile(matchEntry.regex());
+                } catch (PatternSyntaxException ex) {
+                    throw new CommandParseException(ex);
+                }
+            }
+
+            this.matchEntries = matchEntries;
+            this.patterns = patterns;
+            this.addresses = new ModifiableCommandAddress[this.matchEntries.length];
+        }
+
+        ModifiableCommandAddress getGroupFor(Method method) {
+            String name = method.getName();
+
+            GroupEntry[] matchEntries = this.matchEntries;
+            Pattern[] patterns = this.patterns;
+            ModifiableCommandAddress[] addresses = this.addresses;
+
+            for (int i = 0; i < matchEntries.length; i++) {
+                GroupEntry matchEntry = matchEntries[i];
+                if (patterns[i].matcher(name).matches()) {
+                    if (addresses[i] == null) {
+                        addresses[i] = ChildCommandAddress.newPlaceHolderCommand(matchEntry.group(), matchEntry.groupAliases());
+                        groupRootAddress.addChild(addresses[i]);
+                        generateCommands(addresses[i], matchEntry.generatedCommands());
+                        setDescription(addresses[i], matchEntry.description(), matchEntry.shortDescription());
+                    }
+                    return addresses[i];
+                }
+            }
+
+            return groupRootAddress;
+        }
+
+    }
+
+    public static ICommandAddress parseCommandMethod(IParameterTypeSelector selector, Method method, Object instance) throws CommandParseException {
+        return new ReflectiveCommand(selector, method, instance).getAddress();
+    }
+
+    static int parseCommandAttributes(IParameterTypeSelector selector, Method method, ReflectiveCommand command, java.lang.reflect.Parameter[] parameters) throws CommandParseException {
+        ParameterList list = command.getParameterList();
+        boolean hasSenderParameter = false;
+        int start = 0;
+        Class<?> firstParameterType = null;
+        if (parameters.length > start && CommandSender.class.isAssignableFrom(firstParameterType = parameters[0].getType())) {
+            hasSenderParameter = true;
+            start++;
+        }
+
+        boolean hasContextParameter = false;
+        if (parameters.length > start && parameters[start].getType() == ExecutionContext.class) {
+            hasContextParameter = true;
+            start++;
+        }
+
+        String[] parameterNames = lookupParameterNames(method, parameters, start);
+        command.setParameterOrder(parameterNames);
+
+        for (int i = start, n = parameters.length; i < n; i++) {
+            Parameter<?, ?> parameter = parseParameter(selector, method, parameters[i], parameterNames[i - start]);
+            list.addParameter(parameter);
+        }
+
+        RequirePermissions cmdPermissions = method.getAnnotation(RequirePermissions.class);
+        if (cmdPermissions != null) {
+            for (String permission : cmdPermissions.value()) {
+                command.addContextFilter(IContextFilter.permission(permission));
+            }
+
+            if (cmdPermissions.inherit()) {
+                command.addContextFilter(IContextFilter.INHERIT_PERMISSIONS);
+            }
+        } else {
+            command.addContextFilter(IContextFilter.INHERIT_PERMISSIONS);
+        }
+
+        RequireParameters reqPar = method.getAnnotation(RequireParameters.class);
+        if (reqPar != null) {
+            list.setRequiredCount(reqPar.value() < 0 ? Integer.MAX_VALUE : reqPar.value());
+        } else {
+            list.setRequiredCount(list.getIndexedParameters().size());
+        }
+
+        PreprocessArgs preprocessArgs = method.getAnnotation(PreprocessArgs.class);
+        if (preprocessArgs != null) {
+            IArgumentPreProcessor preProcessor = IArgumentPreProcessor.mergeOnTokens(preprocessArgs.tokens(), preprocessArgs.escapeChar());
+            list.setArgumentPreProcessor(preProcessor);
+        }
+
+        Desc desc = method.getAnnotation(Desc.class);
+        if (desc != null) {
+            String[] array = desc.value();
+            if (array.length == 0) {
+                command.setDescription(desc.shortVersion());
+            } else {
+                command.setDescription(array);
+            }
+        } else {
+            command.setDescription();
+        }
+
+        if (hasSenderParameter && Player.class.isAssignableFrom(firstParameterType)) {
+            command.addContextFilter(IContextFilter.PLAYER_ONLY);
+        } else if (hasSenderParameter && ConsoleCommandSender.class.isAssignableFrom(firstParameterType)) {
+            command.addContextFilter(IContextFilter.CONSOLE_ONLY);
+        } else if (method.isAnnotationPresent(RequirePlayer.class)) {
+            command.addContextFilter(IContextFilter.PLAYER_ONLY);
+        } else if (method.isAnnotationPresent(RequireConsole.class)) {
+            command.addContextFilter(IContextFilter.CONSOLE_ONLY);
+        }
+
+        list.setRepeatFinalParameter(parameters.length > start && parameters[parameters.length - 1].isVarArgs());
+        list.setFinalParameterMayBeFlag(true);
+        return (hasSenderParameter ? 1 : 0) | (hasContextParameter ? 2 : 0);
+    }
+
+    public static int parseCommandAttributes(IParameterTypeSelector selector, Method method, ReflectiveCommand command) throws CommandParseException {
+        return parseCommandAttributes(selector, method, command, method.getParameters());
+    }
+
+    public static Parameter<?, ?> parseParameter(IParameterTypeSelector selector, Method method, java.lang.reflect.Parameter parameter, String name) throws CommandParseException {
+        Class<?> type = parameter.getType();
+        if (parameter.isVarArgs()) {
+            type = type.getComponentType();
+        }
+
+        Annotation[] annotations = parameter.getAnnotations();
+        Flag flag = null;
+        Annotation typeAnnotation = null;
+        Desc desc = null;
+
+        for (Annotation annotation : annotations) {
+            //noinspection StatementWithEmptyBody
+            if (annotation instanceof NamedArg) {
+                // do nothing
+            } else if (annotation instanceof Flag) {
+                if (flag != null) {
+                    throw new CommandParseException("Multiple flags for the same parameter");
+                }
+                flag = (Flag) annotation;
+            } else if (annotation instanceof Desc) {
+                if (desc != null) {
+                    throw new CommandParseException("Multiple descriptions for the same parameter");
+                }
+                desc = (Desc) annotation;
+            } else {
+                if (typeAnnotation != null) {
+                    throw new CommandParseException("Multiple parameter type annotations for the same parameter");
+                }
+                typeAnnotation = annotation;
+            }
+        }
+
+        if (flag == null && name.startsWith("-")) {
+            throw new CommandParseException("Non-flag parameter's name starts with -");
+        } else if (flag != null && !name.startsWith("-")) {
+            throw new CommandParseException("Flag parameter's name doesn't start with -");
+        }
+
+        ParameterType<Object, Object> parameterType = selector.selectAny(type, typeAnnotation == null ? null : typeAnnotation.getClass());
+        if (parameterType == null) {
+            throw new CommandParseException("IParameter type not found for parameter " + name + " in method " + method.toGenericString());
+        }
+
+        Object parameterInfo;
+        if (typeAnnotation == null) {
+            parameterInfo = null;
+        } else try {
+            parameterInfo = parameterType.getParameterConfig() == null ? null : parameterType.getParameterConfig().getParameterInfo(typeAnnotation);
+        } catch (Exception ex) {
+            throw new CommandParseException("Invalid parameter config", ex);
+        }
+
+        String descString = desc == null ? null : CommandAnnotationUtils.getShortDescription(desc);
+
+        try {
+            //noinspection unchecked
+            return Parameter.newParameter(name, descString, parameterType, parameterInfo, name.startsWith("-"), flag == null ? null : flag.permission());
+        } catch (Exception ex) {
+            throw new CommandParseException("Invalid parameter", ex);
+        }
+    }
+
+    public static void generateCommands(ICommandAddress address, String[] input) {
+        for (String value : input) {
+            Consumer<ICommandAddress> consumer = PredefinedCommand.getPredefinedCommandGenerator(value);
+            if (consumer == null) {
+                System.out.println("[Command Warning] generated command '" + value + "' could not be found");
+            } else {
+                consumer.accept(address);
+            }
+        }
+    }
+    
+    /*
+    Desired format
+    
+    @Cmd({"tp", "tpto"})
+    @RequirePermissions("teleport.self")
+    public (static) String|void|CommandResult onCommand(Player sender, Player target, @Flag("force", permission = "teleport.self.force") boolean force) {
+        Validate.isTrue(force || !hasTpToggledOff(target), "Target has teleportation disabled. Use -force to ignore");
+        sender.teleport(target);
+        //return
+    }
+    
+    parser needs to:
+    - see the @Cmd and create a CommandTree for it
+    - see that it must be a Player executing the command
+    - add an indexed IParameter for a Player type
+    - add a flag parameter named force, that consumes no arguments.
+    - see that setting the force flag requires a permission
+     */
+
+    private static void setDescription(ICommandAddress address, String[] array, String shortVersion) {
+        if (!address.hasCommand()) {
+            return;
+        }
+
+        if (array.length == 0) {
+            address.getCommand().setDescription(shortVersion);
+        } else {
+            address.getCommand().setDescription(array);
+        }
+
+    }
+
+}