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/*******************************************************************************
* Copyright (c) 2001, 2005 IBM Corporation and others.
* 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:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jem.internal.proxy.initParser;
/*
*/
import java.text.MessageFormat;
public class CharLiteral extends Expression {
protected boolean isComplete;
public char value;
public StringBuffer valueBuffer = new StringBuffer();
protected boolean isEscaped = false;
/**
* constructor
*/
public CharLiteral(){
}
/**
* evaluate method comment.
*/
public Object evaluate() throws Exception {
if (valueBuffer.length() == 1)
return new Character(valueBuffer.charAt(0));
else
throw new EvaluationException(
new IllegalArgumentException(MessageFormat.format(ProxyInitParserMessages.getString("CharTooComplicated_EXC_"), //$NON-NLS-1$
new Object[] {valueBuffer.toString()})));
}
public boolean isComplete(){
return isComplete;
}
/**
* We must evaluate ourself and return the type of the result
*/
public Class getTypeClass() {
return Character.TYPE;
}
protected String getTypeClassName() {
return Character.TYPE.getName();
}
/**
*This string might be broken into a few tokens
*so we need a StringBuffer
*/
public Expression push(char[] token , char delimiter){
if (isEscaped) {
isEscaped = false;
if (token.length != 0) {
// Had an escape followed by stuff, so not a true esc for our current definition
valueBuffer.append(DelimiterEscape);
} else {
if (delimiter == DelimiterSingleQuote || delimiter == DelimiterEscape)
valueBuffer.append(delimiter); // It was a true escape.
else {
valueBuffer.append(DelimiterEscape); // If wasn't a true escape
valueBuffer.append(delimiter);
}
return this;
}
}
valueBuffer.append(token);
if (delimiter == DelimiterSingleQuote){
isComplete =true;
return this;
}
// If the delimiter is an escape character remember it so we can escape
// the next token, otherwise treat it as a literal
if (delimiter == DelimiterEscape ){
isEscaped = true;
} else {
valueBuffer.append(delimiter);
}
return this;
}
/**
* chars are primitives.
*/
public boolean isPrimitive() {
return true;
}
public String toString(){
StringBuffer buffer = new StringBuffer();
buffer.append("Char('"); //$NON-NLS-1$
if ( valueBuffer != null ) {
buffer.append(valueBuffer.toString());
}
buffer.append(')');
return buffer.toString();
}
}
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