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: AttributeValueTemplate.java,v 1.2.4.1 2005/09/01 10:26:57 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler;
  
  import java.util.Enumeration;
  import java.util.Vector;
  import java.util.StringTokenizer;
  import java.util.NoSuchElementException;
  
  import jaxp.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
  import jaxp.sun.org.apache.bcel.internal.generic.Instruction;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionList;
  import jaxp.sun.org.apache.bcel.internal.generic.NEW;
  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;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   */
  final class AttributeValueTemplate extends AttributeValue {
  
      final static int OUT_EXPR = 0;
      final static int IN_EXPR  = 1;
      final static int IN_EXPR_SQUOTES = 2;
      final static int IN_EXPR_DQUOTES = 3;
      final static String DELIMITER = "\uFFFE";      // A Unicode nonchar
  
      public AttributeValueTemplate(String value, Parser parser,
          SyntaxTreeNode parent)
      {
          setParent(parent);
          setParser(parser);
  
          try {
              parseAVTemplate(value, parser);
          }
          catch (NoSuchElementException e) {
              reportError(parent, parser,
                          ErrorMsg.ATTR_VAL_TEMPLATE_ERR, value);
          }
      }
  
      /**
       * Two-pass parsing of ATVs. In the first pass, double curly braces are
       * replaced by one, and expressions are delimited using DELIMITER. The
       * second pass splits up the resulting buffer into literal and non-literal
       * expressions. Errors are reported during the first pass.
       */
      private void parseAVTemplate(String text, Parser parser) {
          StringTokenizer tokenizer =
              new StringTokenizer(text, "{}\"\'", true);
  
          /*
            * First pass: replace double curly braces and delimit expressions
            * Simple automaton to parse ATVs, delimit expressions and report
            * errors.
            */
          String t = null;
          String lookahead = null;
          StringBuffer buffer = new StringBuffer();
          int state = OUT_EXPR;
  
          while (tokenizer.hasMoreTokens()) {
              // Use lookahead if available
              if (lookahead != null) {
                  t = lookahead;
                  lookahead = null;
              }
              else {
                  t = tokenizer.nextToken();
              }
  
              if (t.length() == 1) {
                  switch (t.charAt(0)) {
                      case '{':
                          switch (state) {
                              case OUT_EXPR:
                                  lookahead = tokenizer.nextToken();
                                  if (lookahead.equals("{")) {
                                      buffer.append(lookahead);    // replace {{ by {
                                      lookahead = null;
                                  }
                                  else {
                                      buffer.append(DELIMITER);
                                      state = IN_EXPR;
                                  }
                                  break;
                              case IN_EXPR:
                              case IN_EXPR_SQUOTES:
                              case IN_EXPR_DQUOTES:
                                  reportError(getParent(), parser,
                                              ErrorMsg.ATTR_VAL_TEMPLATE_ERR, text);
                                  break;
                          }
                          break;
                      case '}':
                          switch (state) {
                              case OUT_EXPR:
                                  lookahead = tokenizer.nextToken();
                                  if (lookahead.equals("}")) {
                                      buffer.append(lookahead);    // replace }} by }
                                      lookahead = null;
                                  }
                                  else {
                                      reportError(getParent(), parser,
                                              ErrorMsg.ATTR_VAL_TEMPLATE_ERR, text);
                                  }
                                  break;
                              case IN_EXPR:
                                  buffer.append(DELIMITER);
                                  state = OUT_EXPR;
                                  break;
                              case IN_EXPR_SQUOTES:
                              case IN_EXPR_DQUOTES:
                                  buffer.append(t);
                                  break;
                          }
                          break;
                      case '\'':
                          switch (state) {
                              case IN_EXPR:
                                  state = IN_EXPR_SQUOTES;
                                  break;
                              case IN_EXPR_SQUOTES:
                                  state = IN_EXPR;
                                  break;
                              case OUT_EXPR:
                              case IN_EXPR_DQUOTES:
                                  break;
                          }
                          buffer.append(t);
                          break;
                      case '\"':
                          switch (state) {
                              case IN_EXPR:
                                  state = IN_EXPR_DQUOTES;
                                  break;
                              case IN_EXPR_DQUOTES:
                                  state = IN_EXPR;
                                  break;
                              case OUT_EXPR:
                              case IN_EXPR_SQUOTES:
                                  break;
                          }
                          buffer.append(t);
                          break;
                      default:
                          buffer.append(t);
                          break;
                  }
              }
              else {
                  buffer.append(t);
              }
          }
  
          // Must be in OUT_EXPR at the end of parsing
          if (state != OUT_EXPR) {
              reportError(getParent(), parser,
                          ErrorMsg.ATTR_VAL_TEMPLATE_ERR, text);
          }
  
          /*
            * Second pass: split up buffer into literal and non-literal expressions.
            */
          tokenizer = new StringTokenizer(buffer.toString(), DELIMITER, true);
  
          while (tokenizer.hasMoreTokens()) {
              t = tokenizer.nextToken();
  
              if (t.equals(DELIMITER)) {
                  addElement(parser.parseExpression(this, tokenizer.nextToken()));
                  tokenizer.nextToken();      // consume other delimiter
              }
              else {
                  addElement(new LiteralExpr(t));
              }
          }
      }
  
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
          final Vector contents = getContents();
          final int n = contents.size();
          for (int i = 0; i < n; i++) {
              final Expression exp = (Expression)contents.elementAt(i);
              if (!exp.typeCheck(stable).identicalTo(Type.String)) {
                  contents.setElementAt(new CastExpr(exp, Type.String), i);
              }
          }
          return _type = Type.String;
      }
  
      public String toString() {
          final StringBuffer buffer = new StringBuffer("AVT:[");
          final int count = elementCount();
          for (int i = 0; i < count; i++) {
              buffer.append(elementAt(i).toString());
              if (i < count - 1)
                  buffer.append(' ');
          }
          return buffer.append(']').toString();
      }
  
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
          if (elementCount() == 1) {
              final Expression exp = (Expression)elementAt(0);
              exp.translate(classGen, methodGen);
          }
          else {
              final ConstantPoolGen cpg = classGen.getConstantPool();
              final InstructionList il = methodGen.getInstructionList();
              final int initBuffer = cpg.addMethodref(STRING_BUFFER_CLASS,
                                                      "<init>", "()V");
              final Instruction append =
                  new INVOKEVIRTUAL(cpg.addMethodref(STRING_BUFFER_CLASS,
                                                     "append",
                                                     "(" + STRING_SIG + ")"
                                                     + STRING_BUFFER_SIG));
  
              final int toString = cpg.addMethodref(STRING_BUFFER_CLASS,
                                                    "toString",
                                                    "()"+STRING_SIG);
              il.append(new NEW(cpg.addClass(STRING_BUFFER_CLASS)));
              il.append(DUP);
              il.append(new INVOKESPECIAL(initBuffer));
              // StringBuffer is on the stack
              final Enumeration elements = elements();
              while (elements.hasMoreElements()) {
                  final Expression exp = (Expression)elements.nextElement();
                  exp.translate(classGen, methodGen);
                  il.append(append);
              }
              il.append(new INVOKEVIRTUAL(toString));
          }
      }
  }
  