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: BinOpExpr.java,v 1.2.4.1 2005/09/01 11:42:27 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler;
  
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionList;
  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.MethodType;
  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 BinOpExpr extends Expression {
      public static final int PLUS  = 0;
      public static final int MINUS = 1;
      public static final int TIMES = 2;
      public static final int DIV   = 3;
      public static final int MOD   = 4;
  
      private static final String[] Ops = {
          "+", "-", "*", "/", "%"
      };
  
      private int _op;
      private Expression _left, _right;
  
      public BinOpExpr(int op, Expression left, Expression right) {
          _op = op;
          (_left = left).setParent(this);
          (_right = right).setParent(this);
      }
  
      /**
       * 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() {
          if (_left.hasPositionCall()) return true;
          if (_right.hasPositionCall()) return true;
          return false;
      }
  
      /**
       * Returns true if this expressions contains a call to last()
       */
      public boolean hasLastCall() {
              return (_left.hasLastCall() || _right.hasLastCall());
      }
  
      public void setParser(Parser parser) {
          super.setParser(parser);
          _left.setParser(parser);
          _right.setParser(parser);
      }
  
      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
          final Type tleft = _left.typeCheck(stable);
          final Type tright = _right.typeCheck(stable);
          final MethodType ptype = lookupPrimop(stable, Ops[_op],
                                                new MethodType(Type.Void,
                                                               tleft, tright));
          if (ptype != null) {
              final Type arg1 = (Type) ptype.argsType().elementAt(0);
              if (!arg1.identicalTo(tleft)) {
                  _left = new CastExpr(_left, arg1);
              }
              final Type arg2 = (Type) ptype.argsType().elementAt(1);
              if (!arg2.identicalTo(tright)) {
                  _right = new CastExpr(_right, arg1);
              }
              return _type = ptype.resultType();
          }
          throw new TypeCheckError(this);
      }
  
      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
          final InstructionList il = methodGen.getInstructionList();
  
          _left.translate(classGen, methodGen);
          _right.translate(classGen, methodGen);
  
          switch (_op) {
          case PLUS:
              il.append(_type.ADD());
              break;
          case MINUS:
              il.append(_type.SUB());
              break;
          case TIMES:
              il.append(_type.MUL());
              break;
          case DIV:
              il.append(_type.DIV());
              break;
          case MOD:
              il.append(_type.REM());
              break;
          default:
              ErrorMsg msg = new ErrorMsg(ErrorMsg.ILLEGAL_BINARY_OP_ERR, this);
              getParser().reportError(ERROR, msg);
          }
      }
  
      public String toString() {
          return Ops[_op] + '(' + _left + ", " + _right + ')';
      }
  }
  