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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;
/**
* Rule for def_ BB Recipe functions
* @author kgilmer
*
*/
final class CustomFunctionRule 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 CustomFunctionRule(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;
}
if (i == 'd' && scanAhead(scanner, "o_".toCharArray())) {
scanner.unread();
return Token.UNDEFINED;
}
while (i != ICharacterScanner.EOF && i != 10) {
i = scanner.read();
c++;
if (i == '(') {
readUntil(scanner, ')');
return fToken;
}
}
for (int t = 0; t < c; t++) {
scanner.unread();
}
return Token.UNDEFINED;
}
private void readUntil(ICharacterScanner scanner, int c) {
int i;
do {
i = scanner.read();
} while (! (i == ICharacterScanner.EOF) && ! (i == c));
}
private boolean scanAhead(ICharacterScanner scanner, char [] chars) {
boolean v = true;
for (int i = 0; i < chars.length; ++i) {
if (! (scanner.read() == chars[i])) {
v = false;
for (int j = 0; j < i; ++j) {
scanner.unread();
}
break;
}
}
return v;
}
}
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