| /* |
| * 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.InstructionList; |
| import org.apache.xalan.xsltc.compiler.util.ClassGenerator; |
| import org.apache.xalan.xsltc.compiler.util.MethodGenerator; |
| import org.apache.xalan.xsltc.compiler.util.MethodType; |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import org.apache.xalan.xsltc.compiler.util.TypeCheckError; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| */ |
| final class UnaryOpExpr extends Expression { |
| private Expression _left; |
| |
| public UnaryOpExpr(Expression left) { |
| (_left = left).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() { |
| return(_left.hasPositionCall()); |
| } |
| |
| /** |
| * Returns true if this expressions contains a call to last() |
| */ |
| public boolean hasLastCall() { |
| return(_left.hasLastCall()); |
| } |
| |
| public void setParser(Parser parser) { |
| super.setParser(parser); |
| _left.setParser(parser); |
| } |
| |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| final Type tleft = _left.typeCheck(stable); |
| final MethodType ptype = lookupPrimop(stable, "u-", |
| new MethodType(Type.Void, |
| tleft)); |
| |
| if (ptype != null) { |
| final Type arg1 = (Type) ptype.argsType().elementAt(0); |
| if (!arg1.identicalTo(tleft)) { |
| _left = new CastExpr(_left, arg1); |
| } |
| return _type = ptype.resultType(); |
| } |
| |
| throw new TypeCheckError(this); |
| } |
| |
| public String toString() { |
| return "u-" + '(' + _left + ')'; |
| } |
| |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| InstructionList il = methodGen.getInstructionList(); |
| _left.translate(classGen, methodGen); |
| il.append(_type.NEG()); |
| } |
| } |
| |