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   *  AndroidIDE is distributed in the hope that it will be useful,
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   *  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/>.
   */
  
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   * reserved comment block
   * DO NOT REMOVE OR ALTER!
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  /*
   * 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: XslElement.java,v 1.2.4.1 2005/09/12 11:39:55 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.ConstantPoolGen;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionList;
  import jaxp.sun.org.apache.bcel.internal.generic.LocalVariableGen;
  import jaxp.sun.org.apache.bcel.internal.generic.PUSH;
  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;
  import jaxp.sun.org.apache.xml.internal.utils.XML11Char;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   * @author Morten Jorgensen
   */
  final class XslElement extends Instruction {
  
      private String  _prefix;
      private boolean _ignore = false;
      private boolean _isLiteralName = true;
      private AttributeValueTemplate _name;
      private AttributeValueTemplate _namespace;
  
      /**
       * Displays the contents of the element
       */
      public void display(int indent) {
          indent(indent);
          Util.println("Element " + _name);
          displayContents(indent + IndentIncrement);
      }
  
      /**
       * This method is now deprecated. The new implemation of this class
       * never declares the default NS.
       */
      public boolean declaresDefaultNS() {
          return false;
      }
  
      public void parseContents(Parser parser) {
          final SymbolTable stable = parser.getSymbolTable();
  
          // Handle the 'name' attribute
          String name = getAttribute("name");
          if (name == EMPTYSTRING) {
              ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ELEM_NAME_ERR,
                                          name, this);
              parser.reportError(WARNING, msg);
              parseChildren(parser);
              _ignore = true;     // Ignore the element if the QName is invalid
              return;
          }
  
          // Get namespace attribute
          String namespace = getAttribute("namespace");
  
          // Optimize compilation when name is known at compile time
          _isLiteralName = Util.isLiteral(name);
          if (_isLiteralName) {
              if (!XML11Char.isXML11ValidQName(name)) {
                  ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_ELEM_NAME_ERR,
                                              name, this);
                  parser.reportError(WARNING, msg);
                  parseChildren(parser);
                  _ignore = true;         // Ignore the element if the QName is invalid
                  return;
              }
  
              final QName qname = parser.getQNameSafe(name);
              String prefix = qname.getPrefix();
              String local = qname.getLocalPart();
  
              if (prefix == null) {
                  prefix = EMPTYSTRING;
              }
  
              if (!hasAttribute("namespace")) {
                  namespace = lookupNamespace(prefix);
                  if (namespace == null) {
                      ErrorMsg err = new ErrorMsg(ErrorMsg.NAMESPACE_UNDEF_ERR,
                                                  prefix, this);
                      parser.reportError(WARNING, err);
                      parseChildren(parser);
                      _ignore = true;     // Ignore the element if prefix is undeclared
                      return;
                  }
                  _prefix = prefix;
                  _namespace = new AttributeValueTemplate(namespace, parser, this);
              }
              else {
                  if (prefix == EMPTYSTRING) {
                      if (Util.isLiteral(namespace)) {
                          prefix = lookupPrefix(namespace);
                          if (prefix == null) {
                              prefix = stable.generateNamespacePrefix();
                          }
                      }
  
                      // Prepend prefix to local name
                      final StringBuffer newName = new StringBuffer(prefix);
                      if (prefix != EMPTYSTRING) {
                          newName.append(':');
                      }
                      name = newName.append(local).toString();
                  }
                  _prefix = prefix;
                  _namespace = new AttributeValueTemplate(namespace, parser, this);
              }
          }
          else {
              _namespace = (namespace == EMPTYSTRING) ? null :
                           new AttributeValueTemplate(namespace, parser, this);
          }
  
          _name = new AttributeValueTemplate(name, parser, this);
  
          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(Constants.ERROR, err);
              }
              setFirstElement(new UseAttributeSets(useSets, parser));
          }
  
          parseChildren(parser);
      }
  
      /**
       * Run type check on element name & contents
       */
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
          if (!_ignore) {
              _name.typeCheck(stable);
              if (_namespace != null) {
                  _namespace.typeCheck(stable);
              }
          }
          typeCheckContents(stable);
          return Type.Void;
      }
  
      /**
       * This method is called when the name of the element is known at compile time.
       * In this case, there is no need to inspect the element name at runtime to
       * determine if a prefix exists, needs to be generated, etc.
       */
      public void translateLiteral(ClassGenerator classGen, MethodGenerator methodGen) {
          final ConstantPoolGen cpg = classGen.getConstantPool();
          final InstructionList il = methodGen.getInstructionList();
  
          if (!_ignore) {
              il.append(methodGen.loadHandler());
              _name.translate(classGen, methodGen);
              il.append(DUP2);
              il.append(methodGen.startElement());
  
              if (_namespace != null) {
                  il.append(methodGen.loadHandler());
                  il.append(new PUSH(cpg, _prefix));
                  _namespace.translate(classGen,methodGen);
                  il.append(methodGen.namespace());
              }
          }
  
          translateContents(classGen, methodGen);
  
          if (!_ignore) {
              il.append(methodGen.endElement());
          }
      }
  
      /**
       * At runtime the compilation of xsl:element results in code that: (i)
       * evaluates the avt for the name, (ii) checks for a prefix in the name
       * (iii) generates a new prefix and create a new qname when necessary
       * (iv) calls startElement() on the handler (v) looks up a uri in the XML
       * when the prefix is not known at compile time (vi) calls namespace()
       * on the handler (vii) evaluates the contents (viii) calls endElement().
       */
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
          LocalVariableGen local = null;
          final ConstantPoolGen cpg = classGen.getConstantPool();
          final InstructionList il = methodGen.getInstructionList();
  
          // Optimize translation if element name is a literal
          if (_isLiteralName) {
              translateLiteral(classGen, methodGen);
              return;
          }
  
          if (!_ignore) {
  
              // if the qname is an AVT, then the qname has to be checked at runtime if it is a valid qname
              LocalVariableGen nameValue =
                      methodGen.addLocalVariable2("nameValue",
                                                  Util.getJCRefType(STRING_SIG),
                                                  null);
  
              // store the name into a variable first so _name.translate only needs to be called once
              _name.translate(classGen, methodGen);
              nameValue.setStart(il.append(new ASTORE(nameValue.getIndex())));
              il.append(new ALOAD(nameValue.getIndex()));
  
              // call checkQName if the name is an AVT
              final int check = cpg.addMethodref(BASIS_LIBRARY_CLASS, "checkQName",
                              "("
                              +STRING_SIG
                              +")V");
              il.append(new INVOKESTATIC(check));
  
              // Push handler for call to endElement()
              il.append(methodGen.loadHandler());
  
              // load name value again
              nameValue.setEnd(il.append(new ALOAD(nameValue.getIndex())));
  
              if (_namespace != null) {
                  _namespace.translate(classGen, methodGen);
              }
              else {
                  il.append(ACONST_NULL);
              }
  
              // Push additional arguments
              il.append(methodGen.loadHandler());
              il.append(methodGen.loadDOM());
              il.append(methodGen.loadCurrentNode());
  
              // Invoke BasisLibrary.startXslElemCheckQName()
              il.append(new INVOKESTATIC(
              cpg.addMethodref(BASIS_LIBRARY_CLASS, "startXslElement",
                      "(" + STRING_SIG
                      + STRING_SIG
                      + TRANSLET_OUTPUT_SIG
                      + DOM_INTF_SIG + "I)" + STRING_SIG)));
  
  
          }
  
          translateContents(classGen, methodGen);
  
          if (!_ignore) {
              il.append(methodGen.endElement());
          }
      }
  
      /**
       * Override this method to make sure that xsl:attributes are not
       * copied to output if this xsl:element is to be ignored
       */
      public void translateContents(ClassGenerator classGen,
                                    MethodGenerator methodGen) {
          final int n = elementCount();
          for (int i = 0; i < n; i++) {
              final SyntaxTreeNode item =
                  (SyntaxTreeNode)getContents().elementAt(i);
              if (_ignore && item instanceof XslAttribute) continue;
              item.translate(classGen, methodGen);
          }
      }
  
  }
  