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 try
  20  * statements, exception handlers, etc...
  21  */
  22 public class LabelFlowContext extends SwitchFlowContext {
  23
  24         public char[] labelName;
  25
  26         public LabelFlowContext(FlowContext parent, ASTNode associatedNode,
  27                         char[] labelName, Label breakLabel, BlockScope scope) {
  28
  29                 super(parent, associatedNode, breakLabel);
  30                 this.labelName = labelName;
  31                 checkLabelValidity(scope);
  32         }
  33
  34         void checkLabelValidity(BlockScope scope) {
  35
  36                 // check if label was already defined above
  37                 FlowContext current = parent;
  38                 while (current != null) {
  39                         char[] currentLabelName;
  40                         if (((currentLabelName = current.labelName()) != null)
  41                                         && CharOperation.equals(currentLabelName, labelName)) {
  42                                 scope.problemReporter().alreadyDefinedLabel(labelName,
  43                                                 associatedNode);
  44                         }
  45                         current = current.parent;
  46                 }
  47         }
  48
  49         public String individualToString() {
  50
  51                 return "Label flow context [label:" + String.valueOf(labelName) + "]"; //$NON-NLS-2$ //$NON-NLS-1$
  52         }
  53
  54         public char[] labelName() {
  55
  56                 return labelName;
  57         }
  58 }