net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/CaseStatement.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.codegen.CaseLabel;
  15 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  16 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  17 import net.sourceforge.phpdt.internal.compiler.impl.Constant;
  18 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  19 import net.sourceforge.phpdt.internal.compiler.lookup.TypeBinding;
  20
  21
  22 public class CaseStatement extends Statement {
  23
  24         public Expression constantExpression;
  25         public CaseLabel targetLabel;
  26         public CaseStatement(int sourceStart, Expression constantExpression) {
  27                 this.constantExpression = constantExpression;
  28                 this.sourceEnd = constantExpression.sourceEnd;
  29                 this.sourceStart = sourceStart;
  30         }
  31
  32         public FlowInfo analyseCode(
  33                 BlockScope currentScope,
  34                 FlowContext flowContext,
  35                 FlowInfo flowInfo) {
  36
  37                 if (constantExpression.constant == NotAConstant)
  38                         currentScope.problemReporter().caseExpressionMustBeConstant(constantExpression);
  39
  40                 this.constantExpression.analyseCode(currentScope, flowContext, flowInfo);
  41                 return flowInfo;
  42         }
  43
  44         /**
  45          * Case code generation
  46          *
  47          */
  48 //      public void generateCode(BlockScope currentScope, CodeStream codeStream) {
  49 //
  50 //              if ((bits & IsReachableMASK) == 0) {
  51 //                      return;
  52 //              }
  53 //              int pc = codeStream.position;
  54 //              targetLabel.place();
  55 //              codeStream.recordPositionsFrom(pc, this.sourceStart);
  56 //      }
  57         public StringBuffer printStatement(int tab, StringBuffer output) {
  58
  59                 printIndent(tab, output);
  60                 if (constantExpression == null) {
  61                         output.append("default : "); //$NON-NLS-1$
  62                 } else {
  63                         output.append("case "); //$NON-NLS-1$
  64                         constantExpression.printExpression(0, output).append(" : "); //$NON-NLS-1$
  65                 }
  66                 return output.append(';');
  67         }
  68         /**
  69          * No-op : should use resolveCase(...) instead.
  70          */
  71         public void resolve(BlockScope scope) {
  72         }
  73
  74         public Constant resolveCase(
  75                 BlockScope scope,
  76                 TypeBinding switchType,
  77                 SwitchStatement switchStatement) {
  78
  79                 // add into the collection of cases of the associated switch statement
  80                 switchStatement.cases[switchStatement.caseCount++] = this;
  81                 TypeBinding caseType = constantExpression.resolveType(scope);
  82                 if (caseType == null || switchType == null)
  83                         return null;
  84                 if (constantExpression.isConstantValueOfTypeAssignableToType(caseType, switchType))
  85                         return constantExpression.constant;
  86                 if (caseType.isCompatibleWith(switchType))
  87                         return constantExpression.constant;
  88                 scope.problemReporter().typeMismatchErrorActualTypeExpectedType(
  89                         constantExpression,
  90                         caseType,
  91                         switchType);
  92                 return null;
  93         }
  94
  95         public String toString(int tab) {
  96
  97                 String s = tabString(tab);
  98                 s = s + "case " + constantExpression.toStringExpression() + " : "; //$NON-NLS-1$ //$NON-NLS-2$
  99                 return s;
 100         }
 101
 102         public void traverse(
 103             ASTVisitor visitor,
 104                 BlockScope blockScope) {
 105
 106                 if (visitor.visit(this, blockScope)) {
 107                         constantExpression.traverse(visitor, blockScope);
 108                 }
 109                 visitor.endVisit(this, blockScope);
 110         }
 111 }