| /******************************************************************************* |
| * Copyright (c) 2000, 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Common Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/cpl-v10.html |
| * |
| * 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.*; |
| |
| public class CharLiteral extends NumberLiteral { |
| char value; |
| public CharLiteral(char[] token, int s, int e) { |
| super(token, s, e); |
| computeValue(); |
| } |
| 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].... |
| |
| constant = Constant.fromValue(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 ((value = source[1]) != '\\') |
| return; |
| char digit; |
| switch (digit = source[2]) { |
| case 'b' : |
| value = '\b'; |
| break; |
| case 't' : |
| value = '\t'; |
| break; |
| case 'n' : |
| value = '\n'; |
| break; |
| case 'f' : |
| value = '\f'; |
| break; |
| case 'r' : |
| value = '\r'; |
| break; |
| case '\"' : |
| value = '\"'; |
| break; |
| case '\'' : |
| value = '\''; |
| break; |
| case '\\' : |
| value = '\\'; |
| break; |
| default : //octal (well-formed: ended by a ' ) |
| int number = Character.getNumericValue(digit); |
| if ((digit = source[3]) != '\'') |
| number = (number * 8) + Character.getNumericValue(digit); |
| else { |
| constant = Constant.fromValue(value = (char) number); |
| break; |
| } |
| if ((digit = source[4]) != '\'') |
| number = (number * 8) + Character.getNumericValue(digit); |
| value = (char) number; |
| break; |
| } |
| } |
| /** |
| * CharLiteral code generation |
| * |
| * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope |
| * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream |
| * @param valueRequired boolean |
| */ |
| public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) { |
| int pc = codeStream.position; |
| if (valueRequired) { |
| codeStream.generateConstant(constant, implicitConversion); |
| } |
| codeStream.recordPositionsFrom(pc, this.sourceStart); |
| } |
| public TypeBinding literalType(BlockScope scope) { |
| return CharBinding; |
| } |
| public void traverse(ASTVisitor visitor, BlockScope blockScope) { |
| visitor.visit(this, blockScope); |
| visitor.endVisit(this, blockScope); |
| } |
| } |