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/*****************************************************************************
* Copyright (c) 2009 Ken Gilmer
* 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:
* Ken Gilmer - initial API and implementation
*******************************************************************************/
package org.openembedded.bc.ui.editors.bitbake;
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.Token;
final class VariableRule implements IRule {
/** Token to return for this rule */
private final IToken fToken;
/**
* Creates a new operator rule.
*
* @param token
* Token to use for this rule
*/
public VariableRule(IToken token) {
fToken = token;
}
public IToken evaluate(ICharacterScanner scanner) {
if (scanner.getColumn() > 0) {
return Token.UNDEFINED;
}
int i = scanner.read();
int c = 1;
if (!Character.isLetter(i) && i != 10) {
scanner.unread();
return Token.UNDEFINED;
}
int p = i;
while (i != ICharacterScanner.EOF && i != 10) {
p = i;
i = scanner.read();
c++;
if (i == '=') {
scanner.unread();
if (p == '?' || p == '+') {
scanner.unread();
}
return fToken;
}
}
for (int t = 0; t < c; t++) {
scanner.unread();
}
return Token.UNDEFINED;
}
}
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