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package io.dico.dicore.command.parameter;
public class ArgumentMergingPreProcessor implements IArgumentPreProcessor {
private final String tokens;
private final char escapeChar;
public ArgumentMergingPreProcessor(String tokens, char escapeChar) {
if ((tokens.length() & 1) != 0 || tokens.isEmpty()) throw new IllegalArgumentException();
this.tokens = tokens;
this.escapeChar = escapeChar;
}
@Override
public String[] process(int argStart, String[] args) {
if (!(0 <= argStart && argStart <= args.length)) {
throw new IndexOutOfBoundsException();
}
Parser parser = new Parser(argStart, args.clone());
return parser.doProcess();
}
private class Parser {
private final int argStart;
private final String[] args;
private int currentIndex;
private int sectionStart;
private char closingToken;
private int sectionEnd;
private int removeCount;
Parser(int argStart, String[] args) {
this.argStart = argStart;
this.args = args;
}
private void reset() {
removeCount = 0;
closingToken = 0;
sectionStart = -1;
sectionEnd = -1;
currentIndex = argStart;
}
private boolean findNextSectionStart() {
while (currentIndex < args.length) {
String arg = args[currentIndex];
if (arg == null) {
throw new IllegalArgumentException();
}
if (arg.isEmpty()) {
++currentIndex;
continue;
}
int openingTokenIndex = tokens.indexOf(arg.charAt(0));
if (openingTokenIndex == -1 || (openingTokenIndex & 1) != 0) {
++currentIndex;
continue;
}
// found
closingToken = tokens.charAt(openingTokenIndex | 1);
sectionStart = currentIndex;
return true;
}
return false;
}
private boolean findNextSectionEnd() {
while (currentIndex < args.length) {
String arg = args[currentIndex];
if (arg == null) {
throw new IllegalArgumentException();
}
if (arg.isEmpty()
|| arg.charAt(arg.length() - 1) != closingToken
|| (sectionStart == currentIndex && arg.length() == 1)) {
++currentIndex;
continue;
}
if (escapeChar != 0
&& arg.length() > 1
&& arg.charAt(arg.length() - 2) == escapeChar) {
// escaped
++currentIndex;
continue;
}
// found
closingToken = 0;
sectionEnd = currentIndex;
++currentIndex;
return true;
}
return false;
}
private void processFoundSection() {
if (sectionStart == sectionEnd) {
String arg = args[sectionStart];
args[sectionStart] = arg.substring(1, arg.length() - 1);
return;
}
removeCount += sectionEnd - sectionStart;
StringBuilder sb = new StringBuilder();
sb.append(args[sectionStart].substring(1));
for (int i = sectionStart + 1; i < sectionEnd; i++) {
sb.append(' ');
sb.append(args[i]);
args[i] = null;
}
sb.append(' ');
sb.append(args[sectionEnd].substring(0, args[sectionEnd].length() - 1));
args[sectionEnd] = null;
args[sectionStart] = sb.toString();
sectionStart = -1;
sectionEnd = -1;
}
public String[] doProcess() {
reset();
while (findNextSectionStart()) {
if (findNextSectionEnd()) {
processFoundSection();
} else {
currentIndex = sectionStart + 1;
}
}
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;
}
}
}
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