src/org/eclipse/jdt/internal/compiler/ast/PostfixExpression.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 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 org.eclipse.jdt.internal.compiler.ast;
  12
  13 import org.eclipse.jdt.internal.compiler.ASTVisitor;
  14 import org.eclipse.jdt.internal.compiler.codegen.*;
  15 import org.eclipse.jdt.internal.compiler.lookup.*;
  16
  17 public class PostfixExpression extends CompoundAssignment {
  18
  19         public PostfixExpression(Expression l, Expression e, int op, int pos) {
  20
  21                 super(l, e, op, pos);
  22                 this.sourceStart = l.sourceStart;
  23                 this.sourceEnd = pos;
  24         }
  25
  26         /**
  27          * Code generation for PostfixExpression
  28          *
  29          * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
  30          * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
  31          * @param valueRequired boolean
  32          */
  33         public void generateCode(
  34                 BlockScope currentScope,
  35                 CodeStream codeStream,
  36                 boolean valueRequired) {
  37
  38                 // various scenarii are possible, setting an array reference,
  39                 // a field reference, a blank final field reference, a field of an enclosing instance or
  40                 // just a local variable.
  41
  42                 int pc = codeStream.position;
  43                  ((Reference) lhs).generatePostIncrement(currentScope, codeStream, this, valueRequired);
  44                 if (valueRequired) {
  45                         codeStream.generateImplicitConversion(implicitConversion);
  46                 }
  47                 codeStream.recordPositionsFrom(pc, this.sourceStart);
  48         }
  49
  50         public String operatorToString() {
  51                 switch (operator) {
  52                         case PLUS :
  53                                 return "++"; //$NON-NLS-1$
  54                         case MINUS :
  55                                 return "--"; //$NON-NLS-1$
  56                 }
  57                 return "unknown operator"; //$NON-NLS-1$
  58         }
  59
  60         public StringBuffer printExpressionNoParenthesis(int indent, StringBuffer output) {
  61
  62                 return lhs.printExpression(indent, output).append(' ').append(operatorToString());
  63         }
  64
  65         public boolean restrainUsageToNumericTypes() {
  66
  67                 return true;
  68         }
  69
  70         public void traverse(ASTVisitor visitor, BlockScope scope) {
  71
  72                 if (visitor.visit(this, scope)) {
  73                         lhs.traverse(visitor, scope);
  74                 }
  75                 visitor.endVisit(this, scope);
  76         }
  77 }