content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * Copyright 2001-2004 The Apache Software Foundation.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /*
   * $Id: Choose.java,v 1.2.4.1 2005/09/01 12:00:14 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler;
  
  import java.util.Enumeration;
  import java.util.Vector;
  
  import jaxp.sun.org.apache.bcel.internal.generic.BranchHandle;
  import jaxp.sun.org.apache.bcel.internal.generic.GOTO;
  import jaxp.sun.org.apache.bcel.internal.generic.IFEQ;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionHandle;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionList;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   * @author Morten Jorgensen
   */
  final class Choose extends Instruction {
  
      /**
       * Display the element contents (a lot of when's and an otherwise)
       */
      public void display(int indent) {
          indent(indent);
          Util.println("Choose");
          indent(indent + IndentIncrement);
          displayContents(indent + IndentIncrement);
      }
  
      /**
       * Translate this Choose element. Generate a test-chain for the various
       * <xsl:when> elements and default to the <xsl:otherwise> if present.
       */
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
          final Vector whenElements = new Vector();
          Otherwise otherwise = null;
          Enumeration elements = elements();
  
          // These two are for reporting errors only
          ErrorMsg error = null;
          final int line = getLineNumber();
  
          // Traverse all child nodes - must be either When or Otherwise
          while (elements.hasMoreElements()) {
              Object element = elements.nextElement();
              // Add a When child element
              if (element instanceof When) {
                  whenElements.addElement(element);
              }
              // Add an Otherwise child element
              else if (element instanceof Otherwise) {
                  if (otherwise == null) {
                      otherwise = (Otherwise)element;
                  }
                  else {
                      error = new ErrorMsg(ErrorMsg.MULTIPLE_OTHERWISE_ERR, this);
                      getParser().reportError(ERROR, error);
                  }
              }
              else if (element instanceof Text) {
                  ((Text)element).ignore();
              }
              // It is an error if we find some other element here
              else {
                  error = new ErrorMsg(ErrorMsg.WHEN_ELEMENT_ERR, this);
                  getParser().reportError(ERROR, error);
              }
          }
  
          // Make sure that there is at least one <xsl:when> element
          if (whenElements.size() == 0) {
              error = new ErrorMsg(ErrorMsg.MISSING_WHEN_ERR, this);
              getParser().reportError(ERROR, error);
              return;
          }
  
          InstructionList il = methodGen.getInstructionList();
  
          // next element will hold a handle to the beginning of next
          // When/Otherwise if test on current When fails
          BranchHandle nextElement = null;
          Vector exitHandles = new Vector();
          InstructionHandle exit = null;
  
          Enumeration whens = whenElements.elements();
          while (whens.hasMoreElements()) {
              final When when = (When)whens.nextElement();
              final Expression test = when.getTest();
  
              InstructionHandle truec = il.getEnd();
  
              if (nextElement != null)
                  nextElement.setTarget(il.append(NOP));
              test.translateDesynthesized(classGen, methodGen);
  
              if (test instanceof FunctionCall) {
                  FunctionCall call = (FunctionCall)test;
                  try {
                      Type type = call.typeCheck(getParser().getSymbolTable());
                      if (type != Type.Boolean) {
                          test._falseList.add(il.append(new IFEQ(null)));
                      }
                  }
                  catch (TypeCheckError e) {
                      // handled later!
                  }
              }
              // remember end of condition
              truec = il.getEnd();
  
              // The When object should be ignored completely in case it tests
              // for the support of a non-available element
              if (!when.ignore()) when.translateContents(classGen, methodGen);
  
              // goto exit after executing the body of when
              exitHandles.addElement(il.append(new GOTO(null)));
              if (whens.hasMoreElements() || otherwise != null) {
                  nextElement = il.append(new GOTO(null));
                  test.backPatchFalseList(nextElement);
              }
              else
                  test.backPatchFalseList(exit = il.append(NOP));
              test.backPatchTrueList(truec.getNext());
          }
  
          // Translate any <xsl:otherwise> element
          if (otherwise != null) {
              nextElement.setTarget(il.append(NOP));
              otherwise.translateContents(classGen, methodGen);
              exit = il.append(NOP);
          }
  
          // now that end is known set targets of exit gotos
          Enumeration exitGotos = exitHandles.elements();
          while (exitGotos.hasMoreElements()) {
              BranchHandle gotoExit = (BranchHandle)exitGotos.nextElement();
              gotoExit.setTarget(exit);
          }
      }
  }
  