first scanner /parser copied from the jdt java version
[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / compiler / ast / TrueLiteral.java
1 /*******************************************************************************
2  * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
3  * All rights reserved. This program and the accompanying materials 
4  * are made available under the terms of the Common Public License v0.5 
5  * which accompanies this distribution, and is available at
6  * http://www.eclipse.org/legal/cpl-v05.html
7  * 
8  * Contributors:
9  *     IBM Corporation - initial API and implementation
10  ******************************************************************************/
11 package net.sourceforge.phpdt.internal.compiler.ast;
12
13 import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
14 import net.sourceforge.phpdt.internal.compiler.codegen.CodeStream;
15 import net.sourceforge.phpdt.internal.compiler.codegen.Label;
16 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
17 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
18 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
19
20 public class TrueLiteral extends MagicLiteral {
21         static final char[] source = {'t' , 'r' , 'u' , 'e'};
22 public TrueLiteral(int s , int e) {
23         super(s,e);
24 }
25 public void computeConstant() {
26
27         constant = Constant.fromValue(true);}
28 /**
29  * Code generation for the true literal
30  *
31  * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
32  * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
33  * @param valueRequired boolean
34  */ 
35 public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
36         int pc = codeStream.position;
37         if (valueRequired)
38                 codeStream.iconst_1();
39         codeStream.recordPositionsFrom(pc, this.sourceStart);
40 }
41 public void generateOptimizedBoolean(BlockScope currentScope, CodeStream codeStream, Label trueLabel, Label falseLabel, boolean valueRequired) {
42
43         // trueLabel being not nil means that we will not fall through into the TRUE case
44
45         int pc = codeStream.position;
46         // constant == true
47         if (valueRequired) {
48                 if (falseLabel == null) {
49                         // implicit falling through the FALSE case
50                         if (trueLabel != null) {
51                                 codeStream.goto_(trueLabel);
52                         }
53                 }
54         }
55         codeStream.recordPositionsFrom(pc, this.sourceStart);
56 }
57 public TypeBinding literalType(BlockScope scope) {
58         return BooleanBinding;
59 }
60 /**
61  * 
62  */
63 public char[] source() {
64         return source;
65 }
66 public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope scope) {
67         visitor.visit(this, scope);
68         visitor.endVisit(this, scope);
69 }
70 }