net.sourceforge.phpeclipse/src/net/sourceforge/phpeclipse/internal/compiler/ast/ThisReference.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2003 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package net.sourceforge.phpeclipse.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  15 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  16 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  17 import net.sourceforge.phpdt.internal.compiler.lookup.MethodScope;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  19
  20 public class ThisReference extends Reference {
  21
  22         public static ThisReference implicitThis(){
  23
  24                 ThisReference implicitThis = new ThisReference(0, 0);
  25                 implicitThis.bits |= IsImplicitThisMask;
  26                 return implicitThis;
  27         }
  28
  29         public ThisReference(int sourceStart, int sourceEnd) {
  30
  31                 this.sourceStart = sourceStart;
  32                 this.sourceEnd = sourceEnd;
  33         }
  34
  35         /*
  36          * @see Reference#analyseAssignment(...)
  37          */
  38         public FlowInfo analyseAssignment(BlockScope currentScope, FlowContext flowContext, FlowInfo flowInfo, Assignment assignment, boolean isCompound) {
  39
  40                 return flowInfo; // this cannot be assigned
  41         }
  42
  43         public boolean checkAccess(MethodScope methodScope) {
  44
  45                 // this/super cannot be used in constructor call
  46                 if (methodScope.isConstructorCall) {
  47                         methodScope.problemReporter().fieldsOrThisBeforeConstructorInvocation(this);
  48                         return false;
  49                 }
  50
  51                 // static may not refer to this/super
  52                 if (methodScope.isStatic) {
  53                         methodScope.problemReporter().errorThisSuperInStatic(this);
  54                         return false;
  55                 }
  56                 return true;
  57         }
  58
  59         /*
  60          * @see Reference#generateAssignment(...)
  61          */
  62 //      public void generateAssignment(BlockScope currentScope, CodeStream codeStream, Assignment assignment, boolean valueRequired) {
  63 //
  64 //               // this cannot be assigned
  65 //      }
  66 //
  67 //      public void generateCode(BlockScope currentScope, CodeStream codeStream, boolean valueRequired) {
  68 //
  69 //              int pc = codeStream.position;
  70 //              if (valueRequired)
  71 //                      codeStream.aload_0();
  72 //              if ((this.bits & IsImplicitThisMask) == 0) codeStream.recordPositionsFrom(pc, this.sourceStart);
  73 //      }
  74 //
  75 //      /*
  76 //       * @see Reference#generateCompoundAssignment(...)
  77 //       */
  78 //      public void generateCompoundAssignment(BlockScope currentScope, CodeStream codeStream, Expression expression, int operator, int assignmentImplicitConversion,  boolean valueRequired) {
  79 //
  80 //               // this cannot be assigned
  81 //      }
  82 //
  83 //      /*
  84 //       * @see org.eclipse.jdt.internal.compiler.ast.Reference#generatePostIncrement()
  85 //       */
  86 //      public void generatePostIncrement(BlockScope currentScope, CodeStream codeStream, CompoundAssignment postIncrement, boolean valueRequired) {
  87 //
  88 //               // this cannot be assigned
  89 //      }
  90
  91         public boolean isImplicitThis() {
  92
  93                 return (this.bits & IsImplicitThisMask) != 0;
  94         }
  95
  96         public boolean isThis() {
  97
  98                 return true ;
  99         }
 100
 101         public TypeBinding resolveType(BlockScope scope) {
 102
 103                 constant = NotAConstant;
 104                 if (!this.isImplicitThis() && !checkAccess(scope.methodScope()))
 105                         return null;
 106                 return this.resolvedType = scope.enclosingSourceType();
 107         }
 108
 109         public String toStringExpression(){
 110
 111                 if (this.isImplicitThis()) return "" ; //$NON-NLS-1$
 112                 return "this"; //$NON-NLS-1$
 113         }
 114
 115         public void traverse(IAbstractSyntaxTreeVisitor visitor, BlockScope blockScope) {
 116
 117                 visitor.visit(this, blockScope);
 118                 visitor.endVisit(this, blockScope);
 119         }
 120 }