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/*******************************************************************************
* Copyright (c) 2006, 2016 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.IRule;
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 AutoconfMacroRule implements IRule {
/**
* The default token to be returned on success and if nothing else has been
* specified.
*/
protected IToken token;
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 StringBuilder fBuffer = new StringBuilder();
private String fStartingSequence;
public AutoconfMacroRule(String startingSequence,
IWordDetector detector, IToken inToken) {
token = inToken;
fDetector = detector;
fStartingSequence = startingSequence;
}
@Override
public IToken evaluate(ICharacterScanner scanner) {
int c = scanner.read();
fBuffer.setLength(0);
for (int i = 0; i < fStartingSequence.length(); i++) {
fBuffer.append((char) c);
if (fStartingSequence.charAt(i) != c) {
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 && c != '(' && c != ';'
&& !fWsDetector.isWhitespace((char)c)) {
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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