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: If.java,v 1.2.4.1 2005/09/01 15:39:47 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler;
  
  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.BooleanType;
  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 If extends Instruction {
  
      private Expression _test;
      private boolean    _ignore = false;
  
      /**
       * Display the contents of this element
       */
      public void display(int indent) {
          indent(indent);
          Util.println("If");
          indent(indent + IndentIncrement);
          System.out.print("test ");
          Util.println(_test.toString());
          displayContents(indent + IndentIncrement);
      }
  
      /**
       * Parse the "test" expression and contents of this element.
       */
      public void parseContents(Parser parser) {
          // Parse the "test" expression
          _test = parser.parseExpression(this, "test", null);
  
          // Make sure required attribute(s) have been set
          if (_test.isDummy()) {
              reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "test");
              return;
          }
  
          // Ignore xsl:if when test is false (function-available() and
          // element-available())
          Object result = _test.evaluateAtCompileTime();
          if (result != null && result instanceof Boolean) {
              _ignore = !((Boolean) result).booleanValue();
          }
  
          parseChildren(parser);
      }
  
      /**
       * Type-check the "test" expression and contents of this element.
       * The contents will be ignored if we know the test will always fail.
       */
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
          // Type-check the "test" expression
          if (_test.typeCheck(stable) instanceof BooleanType == false) {
              _test = new CastExpr(_test, Type.Boolean);
          }
          // Type check the element contents
          if (!_ignore) {
              typeCheckContents(stable);
          }
          return Type.Void;
      }
  
      /**
       * Translate the "test" expression and contents of this element.
       * The contents will be ignored if we know the test will always fail.
       */
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
          final InstructionList il = methodGen.getInstructionList();
          _test.translateDesynthesized(classGen, methodGen);
          // remember end of condition
          final InstructionHandle truec = il.getEnd();
          if (!_ignore) {
              translateContents(classGen, methodGen);
          }
          _test.backPatchFalseList(il.append(NOP));
          _test.backPatchTrueList(truec.getNext());
      }
  }
  