net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/flow/LabelFlowContext.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v0.5
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v05.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.internal.compiler.ast.AstNode;
  14 import net.sourceforge.phpdt.internal.compiler.codegen.Label;
  15 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  16 import net.sourceforge.phpdt.internal.compiler.util.CharOperation;
  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         public char[] labelName;
  24         public LabelFlowContext(
  25                 FlowContext parent,
  26                 AstNode associatedNode,
  27                 char[] labelName,
  28                 Label breakLabel,
  29                 BlockScope scope) {
  30                 super(parent, associatedNode, breakLabel);
  31                 this.labelName = labelName;
  32                 checkLabelValidity(scope);
  33         }
  34
  35         void checkLabelValidity(BlockScope scope) {
  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, associatedNode);
  43                         }
  44                         current = current.parent;
  45                 }
  46         }
  47
  48         public String individualToString() {
  49                 return "Label flow context [label:" + String.valueOf(labelName) + "]"; //$NON-NLS-2$ //$NON-NLS-1$
  50         }
  51
  52         public char[] labelName() {
  53                 return labelName;
  54         }
  55 }