net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/ContinueStatement.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.IAbstractSyntaxTreeVisitor;
  14 import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
  15 import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
  16 import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
  17
  18 public class ContinueStatement extends BranchStatement {
  19
  20         public ContinueStatement(Expression expr, int s, int e) {
  21
  22                 super(expr, s, e);
  23         }
  24
  25         public FlowInfo analyseCode(
  26                 BlockScope currentScope,
  27                 FlowContext flowContext,
  28                 FlowInfo flowInfo) {
  29
  30                 // here requires to generate a sequence of finally blocks invocations depending corresponding
  31                 // to each of the traversed try statements, so that execution will terminate properly.
  32
  33                 // lookup the label, this should answer the returnContext
  34 //              FlowContext targetContext = (expression == null)
  35 //                              ? flowContext.getTargetContextForDefaultContinue()
  36 //                              : flowContext.getTargetContextForContinueLabel(label);
  37
  38 //              if (targetContext == null) {
  39 //                      if (expression == null) {
  40 //                              currentScope.problemReporter().invalidContinue(this);
  41 //                      } else {
  42 //                              currentScope.problemReporter().undefinedLabel(this);
  43 //                      }
  44 //                      return flowInfo; // pretend it did not continue since no actual target
  45 //              }
  46
  47 //              if (targetContext == FlowContext.NotContinuableContext) {
  48 //                      currentScope.problemReporter().invalidContinue(this);
  49 //                      return flowInfo; // pretend it did not continue since no actual target
  50 //              }
  51 //              targetLabel = targetContext.continueLabel();
  52 //              FlowContext traversedContext = flowContext;
  53 //              int subIndex = 0, maxSub = 5;
  54 //              subroutines = new ASTNode[maxSub];
  55 //
  56 //              do {
  57 //                      ASTNode sub;
  58 //                      if ((sub = traversedContext.subRoutine()) != null) {
  59 //                              if (subIndex == maxSub) {
  60 //                                      System.arraycopy(subroutines, 0, (subroutines = new ASTNode[maxSub*=2]), 0, subIndex); // grow
  61 //                              }
  62 //                              subroutines[subIndex++] = sub;
  63 //                              if (sub.cannotReturn()) {
  64 //                                      break;
  65 //                              }
  66 //                      }
  67 //                      traversedContext.recordReturnFrom(flowInfo.unconditionalInits());
  68 //
  69 //                      ASTNode node;
  70 //                      if ((node = traversedContext.associatedNode) instanceof TryStatement) {
  71 //                              TryStatement tryStatement = (TryStatement) node;
  72 //                              flowInfo.addInitializationsFrom(tryStatement.subRoutineInits); // collect inits
  73 //                      } else if (traversedContext == targetContext) {
  74 //                              // only record continue info once accumulated through subroutines, and only against target context
  75 //                              targetContext.recordContinueFrom(flowInfo);
  76 //                              break;
  77 //                      }
  78 //              } while ((traversedContext = traversedContext.parent) != null);
  79 //
  80 //              // resize subroutines
  81 //              if (subIndex != maxSub) {
  82 //                      System.arraycopy(subroutines, 0, (subroutines = new ASTNode[subIndex]), 0, subIndex);
  83 //              }
  84                 return FlowInfo.DEAD_END;
  85         }
  86         public StringBuffer printStatement(int tab, StringBuffer output) {
  87
  88                 printIndent(tab, output).append("continue "); //$NON-NLS-1$
  89                 if (expression != null) output.append(expression);
  90                 return output.append(';');
  91         }
  92         public String toString(int tab) {
  93
  94                 String s = tabString(tab);
  95                 s += "continue "; //$NON-NLS-1$
  96                 if (expression != null)
  97                         s += expression.toString();
  98                 return s;
  99         }
 100
 101         public void traverse(
 102                 IAbstractSyntaxTreeVisitor visitor,
 103                 BlockScope blockScope) {
 104
 105                 visitor.visit(this, blockScope);
 106                 visitor.endVisit(this, blockScope);
 107         }
 108 }