Refactored packagename to net.sourceforge.phpdt.internal.compiler.ast
[phpeclipse.git] / net.sourceforge.phpeclipse / src / net / sourceforge / phpdt / internal / compiler / ast / LabeledStatement.java
index ea7a95c..7070de7 100644 (file)
+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
 package net.sourceforge.phpdt.internal.compiler.ast;
 
-import java.util.List;
+import net.sourceforge.phpdt.internal.compiler.ASTVisitor;
+import net.sourceforge.phpdt.internal.compiler.codegen.Label;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowContext;
+import net.sourceforge.phpdt.internal.compiler.flow.FlowInfo;
+import net.sourceforge.phpdt.internal.compiler.flow.LabelFlowContext;
+import net.sourceforge.phpdt.internal.compiler.lookup.BlockScope;
+
 
-/**
- * @author Matthieu Casanova
- */
 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(); // for supporting nested labels:   a:b:c: someStatement (see 21912)
+               return statement;
+       }
+       
+       /**
+        * Code generation for labeled statement
+        *
+        * may not need actual source positions recording
+        *
+        * @param currentScope net.sourceforge.phpdt.internal.compiler.lookup.BlockScope
+        * @param codeStream net.sourceforge.phpdt.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 StringBuffer printStatement(int tab, StringBuffer output) {
+
+               printIndent(tab, output).append(label).append(": "); //$NON-NLS-1$
+               if (this.statement == null) 
+                       output.append(';');
+               else 
+                       this.statement.printStatement(0, output); 
+               return output;
+       }
+       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(
+           ASTVisitor visitor,
+               BlockScope blockScope) {
+
+               if (visitor.visit(this, blockScope)) {
+                       statement.traverse(visitor, blockScope);
+               }
+               visitor.endVisit(this, blockScope);
+       }
 
-  public char[] label;
-
-  public Statement statement;
-
-  public LabeledStatement(final char[] label, final Statement statement, final int sourceStart, final int sourceEnd) {
-    super(sourceStart, sourceEnd);
-    this.label = label;
-    this.statement = statement;
-  }
-
-  /**
-   * Return the object into String.
-   * It should be overriden
-   * @return a String
-   */
-  public String toString() {
-    return new String(label) + statement.toString();
-  }
-
-  /**
-   * Return the object into String.
-   * @param tab how many tabs (not used here
-   * @return a String
-   */
-  public String toString(final int tab) {
-    return tabString(tab) + toString();
-  }
-
-    /**
-   * Get the variables from outside (parameters, globals ...)
-   * @return the variables from outside
-   */
-  public List getOutsideVariable() {
-    return statement.getOutsideVariable();
-  }
-
-  /**
-   * get the modified variables.
-   * @return the variables modified
-   */
-  public List getModifiedVariable() {
-    return statement.getModifiedVariable();
-  }
-
-  /**
-   * Get the variables used.
-   * @return the variables used
-   */
-  public List getUsedVariable() {
-    return statement.getUsedVariable();
-  }
+       public void resetStateForCodeGeneration() {
+               if (this.targetLabel != null) { 
+                       this.targetLabel.resetStateForCodeGeneration();
+               }
+       }
 }