code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you 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.
   */
  /*
   * $Id$
   */
  
  package org.apache.xalan.xsltc.compiler;
  
  import org.apache.bcel.generic.ALOAD;
  import org.apache.bcel.generic.ASTORE;
  import org.apache.bcel.generic.ConstantPoolGen;
  import org.apache.bcel.generic.GETFIELD;
  import org.apache.bcel.generic.INVOKEINTERFACE;
  import org.apache.bcel.generic.INVOKESTATIC;
  import org.apache.bcel.generic.INVOKEVIRTUAL;
  import org.apache.bcel.generic.InstructionList;
  import org.apache.bcel.generic.LocalVariableGen;
  import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
  import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
  import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
  import org.apache.xalan.xsltc.compiler.util.Type;
  import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
  import org.apache.xalan.xsltc.compiler.util.Util;
  import org.apache.xml.utils.XML11Char;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   */
  final class ProcessingInstruction extends Instruction {
  
      private AttributeValue _name; // name treated as AVT (7.1.3)
      private boolean _isLiteral = false;  // specified name is not AVT  
      
      public void parseContents(Parser parser) {
  	final String name  = getAttribute("name");
      
          if (name.length() > 0) {
              _isLiteral = Util.isLiteral(name);
              if (_isLiteral) {
                  if (!XML11Char.isXML11ValidNCName(name)) {
                      ErrorMsg err = new ErrorMsg(ErrorMsg.INVALID_NCNAME_ERR, name, this);
                      parser.reportError(Constants.ERROR, err);           
                  }
              }   
              _name = AttributeValue.create(this, name, parser);
          }
          else
              reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "name");
              
  	if (name.equals("xml")) {
  	    reportError(this, parser, ErrorMsg.ILLEGAL_PI_ERR, "xml");
  	}
  	parseChildren(parser);
      }
  
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
  	_name.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 (!_isLiteral) {
              // if the ncname is an AVT, then the ncname has to be checked at runtime if it is a valid ncname
              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 checkNCName if the name is an AVT
              final int check = cpg.addMethodref(BASIS_LIBRARY_CLASS, "checkNCName",
                                  "("
                                  +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
          
          }
          
  	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,
  						     "getValueOfPI",
  						     "()" + STRING_SIG)));
  	// call "processingInstruction"
  	final int processingInstruction =
  	    cpg.addInterfaceMethodref(TRANSLET_OUTPUT_INTERFACE,
  				      "processingInstruction", 
  				      "(" + STRING_SIG + STRING_SIG + ")V");
  	il.append(new INVOKEINTERFACE(processingInstruction, 3));
  	// Restore old handler base from stack
  	il.append(methodGen.storeHandler());
      }
  }
  