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/*******************************************************************************
* Copyright (c) 2006, 2007 Red Hat, Inc.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Red Hat Incorporated - initial API and implementation
*******************************************************************************/
package org.eclipse.cdt.autotools.ui.editors;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IPredicateRule;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.IWhitespaceDetector;
import org.eclipse.jface.text.rules.IWordDetector;
import org.eclipse.jface.text.rules.Token;
public class AutoconfMacroPartitionRule implements IPredicateRule {
/**
* The default token to be returned on success and if nothing else has been
* specified.
*/
protected IToken token;
private IWordDetector generalMacroWordDetector;
private IWordDetector m4MacroWordDetector;
protected IWordDetector fDetector;
protected IWhitespaceDetector fWsDetector = new AutoconfWhitespaceDetector();
/** The column constraint */
protected int fColumn = UNDEFINED;
/** Internal setting for the un-initialized column constraint */
protected static final int UNDEFINED = -1;
/** Buffer used for pattern detection */
private StringBuffer fBuffer = new StringBuffer();
public AutoconfMacroPartitionRule(IToken inToken) {
token = inToken;
generalMacroWordDetector = new AutoconfMacroWordDetector();
m4MacroWordDetector = new AutoconfM4WordDetector();
}
@Override
public IToken getSuccessToken() {
return token;
}
protected void matchParentheses(ICharacterScanner scanner) {
boolean finished = false;
int depth = 1;
int quoteDepth = 0;
int c = scanner.read();
while (!finished && c != ICharacterScanner.EOF) {
if (c == '[') {
++quoteDepth;
}
else if (c == ']') {
--quoteDepth;
if (quoteDepth < 0)
finished = true;
}
if (quoteDepth == 0) {
if (c == ')') {
--depth;
if (depth <= 0)
finished = true;
}
else if (c == '(') {
++depth;
}
}
c = scanner.read();
}
}
@Override
public IToken evaluate(ICharacterScanner scanner, boolean resume) {
// if (resume)
// return Token.UNDEFINED;
return evaluate(scanner);
}
@Override
public IToken evaluate(ICharacterScanner scanner) {
int c = scanner.read();
fBuffer.setLength(0);
fBuffer.append((char)c);
if (c == 'A') {
c = scanner.read();
fBuffer.append((char)c);
if (c != 'C' && c != 'H' && c != 'M') {
unreadBuffer(scanner);
return Token.UNDEFINED;
}
fDetector = generalMacroWordDetector;
} else if (c == 'm') {
c = scanner.read();
fBuffer.append((char)c);
if (c != 4) {
unreadBuffer(scanner);
return Token.UNDEFINED;
}
fDetector = m4MacroWordDetector;
} else {
unreadBuffer(scanner);
return Token.UNDEFINED;
}
c = scanner.read();
while (c != ICharacterScanner.EOF
&& fDetector.isWordPart((char) c)) {
fBuffer.append((char) c);
c = scanner.read();
}
if (c != ICharacterScanner.EOF) {
if (c == ';' || fWsDetector.isWhitespace((char)c)) {
// We are done
}
else if (c == '(') {
matchParentheses(scanner);
}
else {
scanner.unread();
unreadBuffer(scanner);
return Token.UNDEFINED;
}
}
scanner.unread();
return token;
}
/**
* Returns the characters in the buffer to the scanner.
*
* @param scanner
* the scanner to be used
*/
protected void unreadBuffer(ICharacterScanner scanner) {
for (int i = fBuffer.length() - 1; i >= 0; i--)
scanner.unread();
}
}
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