Copyright (c) 2000, 2009 IBM Corporation and others.
This program and the accompanying materials
are made available under the terms of the Eclipse Public License 2.0
which accompanies this distribution, and is available at
https://www.eclipse.org/legal/epl-2.0/
SPDX-License-Identifier: EPL-2.0
Contributors:
    IBM Corporation - initial API and implementation
/*******************************************************************************
 * Copyright (c) 2000, 2009 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.compiler.ast;

import org.eclipse.jdt.internal.compiler.ASTVisitor;
import org.eclipse.jdt.internal.compiler.impl.*;
import org.eclipse.jdt.internal.compiler.codegen.*;
import org.eclipse.jdt.internal.compiler.lookup.*;
import org.eclipse.jdt.internal.compiler.parser.ScannerHelper;

public class CharLiteral extends NumberLiteral {
	
	char value;
	
public CharLiteral(char[] token, int s, int e) {
	super(token, s, e);
	computeValue();
}

@Override
public void computeConstant() {
	//The source is a  char[3] first and last char are '
	//This is true for both regular char AND unicode char
	//BUT not for escape char like '\b' which are char[4]....
	this.constant = CharConstant.fromValue(this.value);
}

private void computeValue() {
	//The source is a  char[3] first and last char are '
	//This is true for both regular char AND unicode char
	//BUT not for escape char like '\b' which are char[4]....
	if ((this.value = this.source[1]) != '\\')
		return;
	char digit;
	switch (digit = this.source[2]) {
		case 'b' :
			this.value = '\b';
			break;
		case 't' :
			this.value = '\t';
			break;
		case 'n' :
			this.value = '\n';
			break;
		case 'f' :
			this.value = '\f';
			break;
		case 'r' :
			this.value = '\r';
			break;
		case '\"' :
			this.value = '\"';
			break;
		case '\'' :
			this.value = '\'';
			break;
		case '\\' :
			this.value = '\\';
			break;
		default : //octal (well-formed: ended by a ' )
			int number = ScannerHelper.getNumericValue(digit);
			if ((digit = this.source[3]) != '\'')
				number = (number * 8) + ScannerHelper.getNumericValue(digit);
			else {
				this.constant = CharConstant.fromValue(this.value = (char) number);
				break;
			}
			if ((digit = this.source[4]) != '\'')
				number = (number * 8) + ScannerHelper.getNumericValue(digit);
			this.value = (char) number;
			break;
	}
}

CharLiteral code generation
Params:
currentScope – org.eclipse.jdt.internal.compiler.lookup.BlockScope
codeStream – org.eclipse.jdt.internal.compiler.codegen.CodeStream
valueRequired – boolean/**
 * CharLiteral code generation
 *
 * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
 * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
 * @param valueRequired boolean
 */
@Override
public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
	int pc = codeStream.position;
	if (valueRequired) {
		codeStream.generateConstant(this.constant, this.implicitConversion);
	}
	codeStream.recordPositionsFrom(pc, this.sourceStart);
}

@Override
public TypeBinding literalType(BlockScope scope) {
	return TypeBinding.CHAR;
}

@Override
public void traverse(ASTVisitor visitor, BlockScope blockScope) {
	visitor.visit(this, blockScope);
	visitor.endVisit(this, blockScope);
}
}