first scanner /parser copied from the jdt java version

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

diff --git a/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/LabeledStatement.java b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/LabeledStatement.java
new file mode 100644 (file)
index 0000000..8998f6b
--- /dev/null
+++ b/net.sourceforge.phpeclipse/src/net/sourceforge/phpdt/internal/compiler/ast/LabeledStatement.java
@@ -0,0 +1,126 @@
+/*******************************************************************************
+ * 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.codegen.*;
+import net.sourceforge.phpdt.internal.compiler.flow.*;
+import net.sourceforge.phpdt.internal.compiler.lookup.*;
+
+public class LabeledStatement extends Statement {
+       
+       public Statement statement;
+       public char[] label;
+       public Label targetLabel;
+
+       // for local variables table attributes
+       int mergedInitStateIndex = -1;
+       
+       /**
+        * LabeledStatement constructor comment.
+        */
+       public LabeledStatement(char[] l, Statement st, int s, int e) {
+               
+               this.statement = st;
+               this.label = l;
+               this.sourceStart = s;
+               this.sourceEnd = e;
+       }
+       
+       public FlowInfo analyseCode(
+               BlockScope currentScope,
+               FlowContext flowContext,
+               FlowInfo flowInfo) {
+
+               // need to stack a context to store explicit label, answer inits in case of normal completion merged
+               // with those relative to the exit path from break statement occurring inside the labeled statement.
+               if (statement == null) {
+                       return flowInfo;
+               } else {
+                       LabelFlowContext labelContext;
+                       FlowInfo mergedInfo =
+                               statement
+                                       .analyseCode(
+                                               currentScope,
+                                               (labelContext =
+                                                       new LabelFlowContext(
+                                                               flowContext,
+                                                               this,
+                                                               label,
+                                                               (targetLabel = new Label()),
+                                                               currentScope)),
+                                               flowInfo)
+                                       .mergedWith(labelContext.initsOnBreak);
+                       mergedInitStateIndex =
+                               currentScope.methodScope().recordInitializationStates(mergedInfo);
+                       return mergedInfo;
+               }
+       }
+       
+       public AstNode concreteStatement() {
+               
+               return statement.concreteStatement();
+       }
+       
+       /**
+        * Code generation for labeled statement
+        *
+        * may not need actual source positions recording
+        *
+        * @param currentScope org.eclipse.jdt.internal.compiler.lookup.BlockScope
+        * @param codeStream org.eclipse.jdt.internal.compiler.codegen.CodeStream
+        */
+       public void generateCode(BlockScope currentScope, CodeStream codeStream) {
+               
+               int pc = codeStream.position;
+               if (targetLabel != null) {
+                       targetLabel.codeStream = codeStream;
+                       if (statement != null) {
+                               statement.generateCode(currentScope, codeStream);
+                       }
+                       targetLabel.place();
+               }
+               // May loose some local variable initializations : affecting the local variable attributes
+               if (mergedInitStateIndex != -1) {
+                       codeStream.removeNotDefinitelyAssignedVariables(
+                               currentScope,
+                               mergedInitStateIndex);
+               }
+               codeStream.recordPositionsFrom(pc, this.sourceStart);
+       }
+       
+       public void resolve(BlockScope scope) {
+               
+               statement.resolve(scope);
+       }
+       
+       public String toString(int tab) {
+
+               String s = tabString(tab);
+               s += new String(label) + ": " + statement.toString(0); //$NON-NLS-1$
+               return s;
+       }
+
+       public void traverse(
+               IAbstractSyntaxTreeVisitor visitor,
+               BlockScope blockScope) {
+
+               if (visitor.visit(this, blockScope)) {
+                       statement.traverse(visitor, blockScope);
+               }
+               visitor.endVisit(this, blockScope);
+       }
+
+       public void resetStateForCodeGeneration() {
+
+               this.targetLabel.resetStateForCodeGeneration();
+       }
+}
\ No newline at end of file