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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: XslAttribute.java,v 1.2.4.1 2005/09/12 11:39:32 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler;
  
  import java.util.Vector;
  
  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.GETFIELD;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
  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.serializer.ElemDesc;
  import jaxp.sun.org.apache.xml.internal.serializer.SerializationHandler;
  import jaxp.sun.org.apache.xml.internal.utils.XML11Char;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   * @author Morten Jorgensen
   * @author Erwin Bolwidt <ejb@klomp.org>
   * @author Gunnlaugur Briem <gthb@dimon.is>
   */
  final class XslAttribute extends Instruction {
  
      private String _prefix;
      private AttributeValue _name;       // name treated as AVT (7.1.3)
      private AttributeValueTemplate _namespace = null;
      private boolean _ignore = false;
      private boolean _isLiteral = false;  // specified name is not AVT
  
      /**
       * Returns the name of the attribute
       */
      public AttributeValue getName() {
          return _name;
      }
  
      /**
       * Displays the contents of the attribute
       */
      public void display(int indent) {
          indent(indent);
          Util.println("Attribute " + _name);
          displayContents(indent + IndentIncrement);
      }
  
      /**
       * Parses the attribute's contents. Special care taken for namespaces.
       */
      public void parseContents(Parser parser) {
          boolean generated = false;
          final SymbolTable stable = parser.getSymbolTable();
  
          String name = getAttribute("name");
          String namespace = getAttribute("namespace");
          QName qname = parser.getQName(name, false);
          final String prefix = qname.getPrefix();
  
          if (((prefix != null) && (prefix.equals(XMLNS_PREFIX)))||(name.equals(XMLNS_PREFIX))) {
              reportError(this, parser, ErrorMsg.ILLEGAL_ATTR_NAME_ERR, name);
              return;
          }
  
          _isLiteral = Util.isLiteral(name);
          if (_isLiteral) {
              if (!XML11Char.isXML11ValidQName(name)) {
                  reportError(this, parser, ErrorMsg.ILLEGAL_ATTR_NAME_ERR, name);
                  return;
              }
          }
  
          // Ignore attribute if preceeded by some other type of element
          final SyntaxTreeNode parent = getParent();
          final Vector siblings = parent.getContents();
          for (int i = 0; i < parent.elementCount(); i++) {
              SyntaxTreeNode item = (SyntaxTreeNode)siblings.elementAt(i);
              if (item == this) break;
  
              // These three objects result in one or more attribute output
              if (item instanceof XslAttribute) continue;
              if (item instanceof UseAttributeSets) continue;
              if (item instanceof LiteralAttribute) continue;
              if (item instanceof Text) continue;
  
              // These objects _can_ result in one or more attribute
              // The output handler will generate an error if not (at runtime)
              if (item instanceof If) continue;
              if (item instanceof Choose) continue;
              if (item instanceof CopyOf) continue;
              if (item instanceof VariableBase) continue;
  
              // Report warning but do not ignore attribute
              reportWarning(this, parser, ErrorMsg.STRAY_ATTRIBUTE_ERR, name);
          }
  
          // Get namespace from namespace attribute?
          if (namespace != null && namespace != EMPTYSTRING) {
              _prefix = lookupPrefix(namespace);
              _namespace = new AttributeValueTemplate(namespace, parser, this);
          }
          // Get namespace from prefix in name attribute?
          else if (prefix != null && prefix != EMPTYSTRING) {
              _prefix = prefix;
              namespace = lookupNamespace(prefix);
              if (namespace != null) {
                  _namespace = new AttributeValueTemplate(namespace, parser, this);
              }
          }
  
          // Common handling for namespaces:
          if (_namespace != null) {
              // Generate prefix if we have none
              if (_prefix == null || _prefix == EMPTYSTRING) {
                  if (prefix != null) {
                      _prefix = prefix;
                  }
                  else {
                      _prefix = stable.generateNamespacePrefix();
                      generated = true;
                  }
              }
              else if (prefix != null && !prefix.equals(_prefix)) {
                  _prefix = prefix;
              }
  
              name = _prefix + ":" + qname.getLocalPart();
  
              /*
               * TODO: The namespace URI must be passed to the parent
               * element but we don't yet know what the actual URI is
               * (as we only know it as an attribute value template).
               */
              if ((parent instanceof LiteralElement) && (!generated)) {
                  ((LiteralElement)parent).registerNamespace(_prefix,
                                                             namespace,
                                                             stable, false);
              }
          }
  
          if (parent instanceof LiteralElement) {
              ((LiteralElement)parent).addAttribute(this);
          }
  
          _name = AttributeValue.create(this, name, parser);
          parseChildren(parser);
      }
  
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
          if (!_ignore) {
              _name.typeCheck(stable);
              if (_namespace != null) {
                  _namespace.typeCheck(stable);
              }
              typeCheckContents(stable);
          }
          return Type.Void;
      }
  
      /**
       *
       */
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
          final ConstantPoolGen cpg = classGen.getConstantPool();
          final InstructionList il = methodGen.getInstructionList();
  
          if (_ignore) return;
          _ignore = true;
  
          // Compile code that emits any needed namespace declaration
          if (_namespace != null) {
              // public void attribute(final String name, final String value)
              il.append(methodGen.loadHandler());
              il.append(new PUSH(cpg,_prefix));
              _namespace.translate(classGen,methodGen);
              il.append(methodGen.namespace());
          }
  
          if (!_isLiteral) {
              // 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, "checkAttribQName",
                              "("
                              +STRING_SIG
                              +")V");
              il.append(new INVOKESTATIC(check));
  
              // Save the current handler base on the stack
              il.append(methodGen.loadHandler());
              il.append(DUP);     // first arg to "attributes" call
  
              // load name value again
              nameValue.setEnd(il.append(new ALOAD(nameValue.getIndex())));
          } else {
              // Save the current handler base on the stack
              il.append(methodGen.loadHandler());
              il.append(DUP);     // first arg to "attributes" call
  
              // Push attribute name
              _name.translate(classGen, methodGen);// 2nd arg
  
          }
  
          // Push attribute value - shortcut for literal strings
          if ((elementCount() == 1) && (elementAt(0) instanceof Text)) {
              il.append(new PUSH(cpg, ((Text)elementAt(0)).getText()));
          }
          else {
              il.append(classGen.loadTranslet());
              il.append(new GETFIELD(cpg.addFieldref(TRANSLET_CLASS,
                                                     "stringValueHandler",
                                                     STRING_VALUE_HANDLER_SIG)));
              il.append(DUP);
              il.append(methodGen.storeHandler());
              // translate contents with substituted handler
              translateContents(classGen, methodGen);
              // get String out of the handler
              il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_VALUE_HANDLER,
                                                           "getValue",
                                                           "()" + STRING_SIG)));
          }
  
          SyntaxTreeNode parent = getParent();
          if (parent instanceof LiteralElement
              && ((LiteralElement)parent).allAttributesUnique()) {
              int flags = 0;
              ElemDesc elemDesc = ((LiteralElement)parent).getElemDesc();
  
              // Set the HTML flags
              if (elemDesc != null && _name instanceof SimpleAttributeValue) {
                  String attrName = ((SimpleAttributeValue)_name).toString();
                  if (elemDesc.isAttrFlagSet(attrName, ElemDesc.ATTREMPTY)) {
                      flags = flags | SerializationHandler.HTML_ATTREMPTY;
                  }
                  else if (elemDesc.isAttrFlagSet(attrName, ElemDesc.ATTRURL)) {
                      flags = flags | SerializationHandler.HTML_ATTRURL;
                  }
              }
              il.append(new PUSH(cpg, flags));
              il.append(methodGen.uniqueAttribute());
          }
          else {
              // call "attribute"
              il.append(methodGen.attribute());
          }
  
          // Restore old handler base from stack
          il.append(methodGen.storeHandler());
  
  
  
      }
  
  }
  