1 /*
   2  * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.

   3  */
   4 /*
   5  * Licensed to the Apache Software Foundation (ASF) under one or more
   6  * contributor license agreements.  See the NOTICE file distributed with
   7  * this work for additional information regarding copyright ownership.
   8  * The ASF licenses this file to You under the Apache License, Version 2.0
   9  * (the "License"); you may not use this file except in compliance with
  10  * the License.  You may obtain a copy of the License at
  11  *
  12  *      http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  */
  20 
  21 package com.sun.org.apache.xalan.internal.xsltc.compiler;
  22 
  23 import com.sun.org.apache.bcel.internal.generic.InstructionList;
  24 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
  25 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
  26 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodType;
  27 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
  28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
  29 
  30 /**
  31  * @author Jacek Ambroziak
  32  * @author Santiago Pericas-Geertsen
  33  * @LastModified: Oct 2017
  34  */
  35 final class UnaryOpExpr extends Expression {
  36     private Expression _left;
  37 
  38     public UnaryOpExpr(Expression left) {
  39         (_left = left).setParent(this);
  40     }
  41 
  42     /**
  43      * Returns true if this expressions contains a call to position(). This is
  44      * needed for context changes in node steps containing multiple predicates.
  45      */
  46     public boolean hasPositionCall() {
  47         return(_left.hasPositionCall());
  48     }
  49 
  50     /**
  51      * Returns true if this expressions contains a call to last()
  52      */
  53     public boolean hasLastCall() {
  54             return(_left.hasLastCall());
  55     }
  56 
  57     public void setParser(Parser parser) {
  58         super.setParser(parser);
  59         _left.setParser(parser);
  60     }
  61 
  62     public Type typeCheck(SymbolTable stable) throws TypeCheckError {
  63         final Type tleft = _left.typeCheck(stable);
  64         final MethodType ptype = lookupPrimop(stable, "u-",
  65                                               new MethodType(Type.Void,
  66                                                              tleft));
  67 
  68         if (ptype != null) {
  69             final Type arg1 = ptype.argsType().get(0);
  70             if (!arg1.identicalTo(tleft)) {
  71                 _left = new CastExpr(_left, arg1);
  72             }
  73             return _type = ptype.resultType();
  74         }
  75 
  76         throw new TypeCheckError(this);
  77     }
  78 
  79     public String toString() {
  80         return "u-" + '(' + _left + ')';
  81     }
  82 
  83     public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
  84         InstructionList il = methodGen.getInstructionList();
  85         _left.translate(classGen, methodGen);
  86         il.append(_type.NEG());
  87     }
  88 }
--- EOF ---