net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/flow/LabelFlowContext.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.flow;
  12
  13 import net.sourceforge.phpdt.core.compiler.CharOperation;
  14 import net.sourceforge.phpdt.internal.compiler.ast.ASTNode;
  15 import net.sourceforge.phpdt.internal.compiler.codegen.Label;
  16 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  17
  18 /**
  19  * Reflects the context of code analysis, keeping track of enclosing
  20  *      try statements, exception handlers, etc...
  21  */
  22 public class LabelFlowContext extends SwitchFlowContext {
  23
  24         public char[] labelName;
  25
  26         public LabelFlowContext(
  27                 FlowContext parent,
  28                 ASTNode associatedNode,
  29                 char[] labelName,
  30                 Label breakLabel,
  31                 BlockScope scope) {
  32
  33                 super(parent, associatedNode, breakLabel);
  34                 this.labelName = labelName;
  35                 checkLabelValidity(scope);
  36         }
  37
  38         void checkLabelValidity(BlockScope scope) {
  39
  40                 // check if label was already defined above
  41                 FlowContext current = parent;
  42                 while (current != null) {
  43                         char[] currentLabelName;
  44                         if (((currentLabelName = current.labelName()) != null)
  45                                 && CharOperation.equals(currentLabelName, labelName)) {
  46                                 scope.problemReporter().alreadyDefinedLabel(labelName, associatedNode);
  47                         }
  48                         current = current.parent;
  49                 }
  50         }
  51
  52         public String individualToString() {
  53
  54                 return "Label flow context [label:" + String.valueOf(labelName) + "]"; //$NON-NLS-2$ //$NON-NLS-1$
  55         }
  56
  57         public char[] labelName() {
  58
  59                 return labelName;
  60         }
  61 }