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   *  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: Copy.java,v 1.2.4.1 2005/09/01 12:14:32 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler;
  
  import jaxp.sun.org.apache.bcel.internal.generic.ALOAD;
  import jaxp.sun.org.apache.bcel.internal.generic.ASTORE;
  import jaxp.sun.org.apache.bcel.internal.generic.BranchHandle;
  import jaxp.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  import jaxp.sun.org.apache.bcel.internal.generic.IFEQ;
  import jaxp.sun.org.apache.bcel.internal.generic.IFNULL;
  import jaxp.sun.org.apache.bcel.internal.generic.ILOAD;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
  import jaxp.sun.org.apache.bcel.internal.generic.ISTORE;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionHandle;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionList;
  import jaxp.sun.org.apache.bcel.internal.generic.LocalVariableGen;
  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
   */
  final class Copy extends Instruction {
      private UseAttributeSets _useSets;
  
      public void parseContents(Parser parser) {
          final String useSets = getAttribute("use-attribute-sets");
          if (useSets.length() > 0) {
              if (!Util.isValidQNames(useSets)) {
                  ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_QNAME_ERR, useSets, this);
                  parser.reportError(ERROR, err);
              }
              _useSets = new UseAttributeSets(useSets, parser);
          }
          parseChildren(parser);
      }
  
      public void display(int indent) {
          indent(indent);
          Util.println("Copy");
          indent(indent + IndentIncrement);
          displayContents(indent + IndentIncrement);
      }
  
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
          if (_useSets != null) {
              _useSets.typeCheck(stable);
          }
          typeCheckContents(stable);
          return Type.Void;
      }
  
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
          final ConstantPoolGen cpg = classGen.getConstantPool();
          final InstructionList il = methodGen.getInstructionList();
  
          final LocalVariableGen name =
              methodGen.addLocalVariable2("name",
                                          Util.getJCRefType(STRING_SIG),
                                          null);
          final LocalVariableGen length =
              methodGen.addLocalVariable2("length",
                                          Util.getJCRefType("I"),
                                          null);
  
          // Get the name of the node to copy and save for later
          il.append(methodGen.loadDOM());
          il.append(methodGen.loadCurrentNode());
          il.append(methodGen.loadHandler());
          final int cpy = cpg.addInterfaceMethodref(DOM_INTF,
                                                    "shallowCopy",
                                                    "("
                                                    + NODE_SIG
                                                    + TRANSLET_OUTPUT_SIG
                                                    + ")" + STRING_SIG);
          il.append(new INVOKEINTERFACE(cpy, 3));
          il.append(DUP);
          name.setStart(il.append(new ASTORE(name.getIndex())));
          final BranchHandle ifBlock1 = il.append(new IFNULL(null));
  
          // Get the length of the node name and save for later
          il.append(new ALOAD(name.getIndex()));
          final int lengthMethod = cpg.addMethodref(STRING_CLASS,"length","()I");
          il.append(new INVOKEVIRTUAL(lengthMethod));
          il.append(DUP);
          length.setStart(il.append(new ISTORE(length.getIndex())));
  
          // Ignore attribute sets if current node is ROOT. DOM.shallowCopy()
          // returns "" for ROOT, so skip attribute sets if length == 0
          final BranchHandle ifBlock4 = il.append(new IFEQ(null));
  
          // Copy in attribute sets if specified
          if (_useSets != null) {
              // If the parent of this element will result in an element being
              // output then we know that it is safe to copy out the attributes
              final SyntaxTreeNode parent = getParent();
              if ((parent instanceof LiteralElement) ||
                  (parent instanceof LiteralElement)) {
                  _useSets.translate(classGen, methodGen);
              }
              // If not we have to check to see if the copy will result in an
              // element being output.
              else {
                  // check if element; if not skip to translate body
                  il.append(new ILOAD(length.getIndex()));
                  final BranchHandle ifBlock2 = il.append(new IFEQ(null));
                  // length != 0 -> element -> do attribute sets
                  _useSets.translate(classGen, methodGen);
                  // not an element; root
                  ifBlock2.setTarget(il.append(NOP));
              }
          }
  
          // Instantiate body of xsl:copy
          ifBlock4.setTarget(il.append(NOP));
          translateContents(classGen, methodGen);
  
          // Call the output handler's endElement() if we copied an element
          // (The DOM.shallowCopy() method calls startElement().)
          length.setEnd(il.append(new ILOAD(length.getIndex())));
          final BranchHandle ifBlock3 = il.append(new IFEQ(null));
          il.append(methodGen.loadHandler());
          name.setEnd(il.append(new ALOAD(name.getIndex())));
          il.append(methodGen.endElement());
  
          final InstructionHandle end = il.append(NOP);
          ifBlock1.setTarget(end);
          ifBlock3.setTarget(end);
          methodGen.removeLocalVariable(name);
          methodGen.removeLocalVariable(length);
      }
  }
  