net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/PrefixExpression.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.phpdt.internal.compiler.ast;
  12
  13 import net.sourceforge.phpdt.internal.compiler.ASTVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  15
  16 public class PrefixExpression extends CompoundAssignment {
  17
  18         /**
  19          * PrefixExpression constructor comment.
  20          * @param l net.sourceforge.phpdt.internal.compiler.ast.Expression
  21          * @param r net.sourceforge.phpdt.internal.compiler.ast.Expression
  22          * @param op int
  23          */
  24         public PrefixExpression(Expression l, Expression e, int op, int pos) {
  25
  26                 super(l, e, op, l.sourceEnd);
  27                 this.sourceStart = pos;
  28                 this.sourceEnd = l.sourceEnd;
  29         }
  30
  31         public String operatorToString() {
  32
  33                 switch (operator) {
  34                         case PLUS :
  35                                 return "++"; //$NON-NLS-1$
  36                         case MINUS :
  37                                 return "--"; //$NON-NLS-1$
  38                 }
  39                 return "unknown operator"; //$NON-NLS-1$
  40         }
  41
  42         public boolean restrainUsageToNumericTypes() {
  43
  44                 return true;
  45         }
  46
  47         public String toStringExpressionNoParenthesis() {
  48
  49                 return operatorToString() + " " + lhs.toStringExpression(); //$NON-NLS-1$
  50
  51         }
  52
  53         public void traverse(ASTVisitor visitor, BlockScope scope) {
  54
  55                 if (visitor.visit(this, scope)) {
  56                         lhs.traverse(visitor, scope);
  57                 }
  58                 visitor.endVisit(this, scope);
  59         }
  60 }