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          *
  21          * @param l
  22          *            net.sourceforge.phpdt.internal.compiler.ast.Expression
  23          * @param r
  24          *            net.sourceforge.phpdt.internal.compiler.ast.Expression
  25          * @param op
  26          *            int
  27          */
  28         public PrefixExpression(Expression l, Expression e, int op, int pos) {
  29
  30                 super(l, e, op, l.sourceEnd);
  31                 this.sourceStart = pos;
  32                 this.sourceEnd = l.sourceEnd;
  33         }
  34
  35         public String operatorToString() {
  36
  37                 switch (operator) {
  38                 case PLUS:
  39                         return "++"; //$NON-NLS-1$
  40                 case MINUS:
  41                         return "--"; //$NON-NLS-1$
  42                 }
  43                 return "unknown operator"; //$NON-NLS-1$
  44         }
  45
  46         public boolean restrainUsageToNumericTypes() {
  47
  48                 return true;
  49         }
  50
  51         public String toStringExpressionNoParenthesis() {
  52
  53                 return operatorToString() + " " + lhs.toStringExpression(); //$NON-NLS-1$
  54
  55         }
  56
  57         public void traverse(ASTVisitor visitor, BlockScope scope) {
  58
  59                 if (visitor.visit(this, scope)) {
  60                         lhs.traverse(visitor, scope);
  61                 }
  62                 visitor.endVisit(this, scope);
  63         }
  64 }