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/*******************************************************************************
* Copyright (c) 2018 protos software gmbh (http://www.protos.de).
* 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:
* Henrik Rentz-Reichert (initial contribution)
*
*******************************************************************************/
package org.eclipse.etrice.dctools.fsm.ast.internal
import org.eclipse.etrice.dctools.fsm.ast.tokens.DCToken
import org.eclipse.etrice.dctools.fsm.ast.tokens.DCToken.Kind
import org.eclipse.jface.text.rules.ICharacterScanner
import org.eclipse.jface.text.rules.IRule
import org.eclipse.jface.text.rules.Token
class DCIdentifierRule implements IRule {
val detector = new DCWordDetector
val token = new DCToken(Kind.IDENTIFIER)
val buffer= new StringBuffer
override evaluate(ICharacterScanner scanner) {
buffer.setLength(0)
var c = scanner.read
if (c != ICharacterScanner.EOF && detector.isWordStart(c as char)) {
do {
buffer.append(c as char)
c = scanner.read()
}
while (c != ICharacterScanner.EOF && detector.isWordPart(c as char))
scanner.unread
val id = buffer.toString
if (!id.empty) {
return token
}
}
else {
scanner.unread
}
for (var i= buffer.length() - 1; i >= 0; i--) {
scanner.unread
}
return Token.UNDEFINED
}
}
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