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: CastExpr.java,v 1.2.4.1 2005/09/12 10:06:35 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler;
  
  import jaxp.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  import jaxp.sun.org.apache.bcel.internal.generic.IF_ICMPNE;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionList;
  import jaxp.sun.org.apache.bcel.internal.generic.SIPUSH;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.BooleanType;
  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.MultiHashtable;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeType;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util.ResultTreeType;
  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.xml.internal.dtm.Axis;
  
  /**
   * @author Jacek Ambroziak
   * @author Santiago Pericas-Geertsen
   * @author Morten Jorgensen
   * @author Erwin Bolwidt <ejb@klomp.org>
   */
  final class CastExpr extends Expression {
      private final Expression _left;
  
      /**
       * Legal conversions between internal types.
       */
      static private MultiHashtable InternalTypeMap = new MultiHashtable();
  
      static {
          // Possible type conversions between internal types
          InternalTypeMap.put(Type.Boolean, Type.Boolean);
          InternalTypeMap.put(Type.Boolean, Type.Real);
          InternalTypeMap.put(Type.Boolean, Type.String);
          InternalTypeMap.put(Type.Boolean, Type.Reference);
          InternalTypeMap.put(Type.Boolean, Type.Object);
  
          InternalTypeMap.put(Type.Real, Type.Real);
          InternalTypeMap.put(Type.Real, Type.Int);
          InternalTypeMap.put(Type.Real, Type.Boolean);
          InternalTypeMap.put(Type.Real, Type.String);
          InternalTypeMap.put(Type.Real, Type.Reference);
          InternalTypeMap.put(Type.Real, Type.Object);
  
          InternalTypeMap.put(Type.Int, Type.Int);
          InternalTypeMap.put(Type.Int, Type.Real);
          InternalTypeMap.put(Type.Int, Type.Boolean);
          InternalTypeMap.put(Type.Int, Type.String);
          InternalTypeMap.put(Type.Int, Type.Reference);
          InternalTypeMap.put(Type.Int, Type.Object);
  
          InternalTypeMap.put(Type.String, Type.String);
          InternalTypeMap.put(Type.String, Type.Boolean);
          InternalTypeMap.put(Type.String, Type.Real);
          InternalTypeMap.put(Type.String, Type.Reference);
          InternalTypeMap.put(Type.String, Type.Object);
  
          InternalTypeMap.put(Type.NodeSet, Type.NodeSet);
          InternalTypeMap.put(Type.NodeSet, Type.Boolean);
          InternalTypeMap.put(Type.NodeSet, Type.Real);
          InternalTypeMap.put(Type.NodeSet, Type.String);
          InternalTypeMap.put(Type.NodeSet, Type.Node);
          InternalTypeMap.put(Type.NodeSet, Type.Reference);
          InternalTypeMap.put(Type.NodeSet, Type.Object);
  
          InternalTypeMap.put(Type.Node, Type.Node);
          InternalTypeMap.put(Type.Node, Type.Boolean);
          InternalTypeMap.put(Type.Node, Type.Real);
          InternalTypeMap.put(Type.Node, Type.String);
          InternalTypeMap.put(Type.Node, Type.NodeSet);
          InternalTypeMap.put(Type.Node, Type.Reference);
          InternalTypeMap.put(Type.Node, Type.Object);
  
          InternalTypeMap.put(Type.ResultTree, Type.ResultTree);
          InternalTypeMap.put(Type.ResultTree, Type.Boolean);
          InternalTypeMap.put(Type.ResultTree, Type.Real);
          InternalTypeMap.put(Type.ResultTree, Type.String);
          InternalTypeMap.put(Type.ResultTree, Type.NodeSet);
          InternalTypeMap.put(Type.ResultTree, Type.Reference);
          InternalTypeMap.put(Type.ResultTree, Type.Object);
  
          InternalTypeMap.put(Type.Reference, Type.Reference);
          InternalTypeMap.put(Type.Reference, Type.Boolean);
          InternalTypeMap.put(Type.Reference, Type.Int);
          InternalTypeMap.put(Type.Reference, Type.Real);
          InternalTypeMap.put(Type.Reference, Type.String);
          InternalTypeMap.put(Type.Reference, Type.Node);
          InternalTypeMap.put(Type.Reference, Type.NodeSet);
          InternalTypeMap.put(Type.Reference, Type.ResultTree);
          InternalTypeMap.put(Type.Reference, Type.Object);
  
          InternalTypeMap.put(Type.Object, Type.String);
  
          InternalTypeMap.put(Type.Void, Type.String);
      }
  
      private boolean _typeTest = false;
  
      /**
       * Construct a cast expression and check that the conversion is
       * valid by calling typeCheck().
       */
      public CastExpr(Expression left, Type type) throws TypeCheckError {
          _left = left;
          _type = type;           // use inherited field
  
          if ((_left instanceof Step) && (_type == Type.Boolean)) {
              Step step = (Step)_left;
              if ((step.getAxis() == Axis.SELF) && (step.getNodeType() != -1))
                  _typeTest = true;
          }
  
          // check if conversion is valid
          setParser(left.getParser());
          setParent(left.getParent());
          left.setParent(this);
          typeCheck(left.getParser().getSymbolTable());
      }
  
      public Expression getExpr() {
          return _left;
      }
  
      /**
       * Returns true if this expressions contains a call to position(). This is
       * needed for context changes in node steps containing multiple predicates.
       */
      public boolean hasPositionCall() {
          return(_left.hasPositionCall());
      }
  
      public boolean hasLastCall() {
          return(_left.hasLastCall());
      }
  
      public String toString() {
          return "cast(" + _left + ", " + _type + ")";
      }
  
      /**
       * Type checking a cast expression amounts to verifying that the
       * type conversion is legal. Cast expressions are created during
       * type checking, but typeCheck() is usually not called on them.
       * As a result, this method is called from the constructor.
       */
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
          Type tleft = _left.getType();
          if (tleft == null) {
              tleft = _left.typeCheck(stable);
          }
          if (tleft instanceof NodeType) {
              tleft = Type.Node;  // multiple instances
          }
          else if (tleft instanceof ResultTreeType) {
              tleft = Type.ResultTree; // multiple instances
          }
          if (InternalTypeMap.maps(tleft, _type) != null) {
              return _type;
          }
          // throw new TypeCheckError(this);
          throw new TypeCheckError(new ErrorMsg(
              ErrorMsg.DATA_CONVERSION_ERR, tleft.toString(), _type.toString()));
      }
  
      public void translateDesynthesized(ClassGenerator classGen,
                                         MethodGenerator methodGen) {
          FlowList fl;
          final Type ltype = _left.getType();
  
          // This is a special case for the self:: axis. Instead of letting
          // the Step object create and iterator that we cast back to a single
          // node, we simply ask the DOM for the node type.
          if (_typeTest) {
              final ConstantPoolGen cpg = classGen.getConstantPool();
              final InstructionList il = methodGen.getInstructionList();
  
              final int idx = cpg.addInterfaceMethodref(DOM_INTF,
                                                        "getExpandedTypeID",
                                                        "(I)I");
              il.append(new SIPUSH((short)((Step)_left).getNodeType()));
              il.append(methodGen.loadDOM());
              il.append(methodGen.loadContextNode());
              il.append(new INVOKEINTERFACE(idx, 2));
              _falseList.add(il.append(new IF_ICMPNE(null)));
          }
          else {
  
              _left.translate(classGen, methodGen);
              if (_type != ltype) {
                  _left.startIterator(classGen, methodGen);
                  if (_type instanceof BooleanType) {
                      fl = ltype.translateToDesynthesized(classGen, methodGen,
                                                          _type);
                      if (fl != null) {
                          _falseList.append(fl);
                      }
                  }
                  else {
                      ltype.translateTo(classGen, methodGen, _type);
                  }
              }
          }
      }
  
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
          final Type ltype = _left.getType();
          _left.translate(classGen, methodGen);
          if (_type.identicalTo(ltype) == false) {
              _left.startIterator(classGen, methodGen);
              ltype.translateTo(classGen, methodGen, _type);
          }
      }
  }
  