first scanner /parser copied from the jdt java version

[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / compiler / ast / Continue.java

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/Continue.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/Continue.java
new file mode 100644 (file)
index 0000000..ceeaa7b
--- /dev/null
+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/Continue.java
@@ -0,0 +1,111 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2001, 2002 International Business Machines Corp. and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v0.5 
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v05.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ ******************************************************************************/
+package net.sourceforge.phpdt.internal.compiler.ast;
+
+import net.sourceforge.phpdt.internal.compiler.IAbstractSyntaxTreeVisitor;
+import net.sourceforge.phpdt.internal.compiler.flow.*;
+import net.sourceforge.phpdt.internal.compiler.lookup.*;
+
+public class Continue extends BranchStatement {
+
+       public Continue(char[] l, int s, int e) {
+               
+               super(l, s, e);
+       }
+       
+       public FlowInfo analyseCode(
+               BlockScope currentScope,
+               FlowContext flowContext,
+               FlowInfo flowInfo) {
+
+               // here requires to generate a sequence of finally blocks invocations depending corresponding
+               // to each of the traversed try statements, so that execution will terminate properly.
+
+               // lookup the label, this should answer the returnContext
+               FlowContext targetContext;
+               if (label == null) {
+                       targetContext = flowContext.getTargetContextForDefaultContinue();
+               } else {
+                       targetContext = flowContext.getTargetContextForContinueLabel(label);
+               }
+               if (targetContext == null) {
+                       if (label == null) {
+                               currentScope.problemReporter().invalidContinue(this);
+                       } else {
+                               currentScope.problemReporter().undefinedLabel(this); // need to improve
+                       }
+               } else {
+                       if (targetContext == FlowContext.NotContinuableContext) {
+                               currentScope.problemReporter().invalidContinue(this);
+                               return FlowInfo.DeadEnd;
+                       }
+                       targetLabel = targetContext.continueLabel();
+                       targetContext.recordContinueFrom(flowInfo);
+                       FlowContext traversedContext = flowContext;
+                       int subIndex = 0, maxSub = 5;
+                       subroutines = new AstNode[maxSub];
+                       while (true) {
+                               AstNode sub;
+                               if ((sub = traversedContext.subRoutine()) != null) {
+                                       if (subIndex == maxSub) {
+                                               System.arraycopy(
+                                                       subroutines,
+                                                       0,
+                                                       (subroutines = new AstNode[maxSub *= 2]),
+                                                       0,
+                                                       subIndex);
+                                               // grow
+                                       }
+                                       subroutines[subIndex++] = sub;
+                                       if (sub.cannotReturn()) {
+                                               break;
+                                       }
+                               }
+                               // remember the initialization at this
+                               // point for dealing with blank final variables.
+                               traversedContext.recordReturnFrom(flowInfo.unconditionalInits());
+
+                               if (traversedContext == targetContext) {
+                                       break;
+                               } else {
+                                       traversedContext = traversedContext.parent;
+                               }
+                       }
+                       // resize subroutines
+                       if (subIndex != maxSub) {
+                               System.arraycopy(
+                                       subroutines,
+                                       0,
+                                       (subroutines = new AstNode[subIndex]),
+                                       0,
+                                       subIndex);
+                       }
+               }
+               return FlowInfo.DeadEnd;
+       }
+
+       public String toString(int tab) {
+
+               String s = tabString(tab);
+               s = s + "continue "; //$NON-NLS-1$
+               if (label != null)
+                       s = s + new String(label);
+               return s;
+       }
+
+       public void traverse(
+               IAbstractSyntaxTreeVisitor visitor,
+               BlockScope blockScope) {
+
+               visitor.visit(this, blockScope);
+               visitor.endVisit(this, blockScope);
+       }
+}
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