/*
* 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: UnaryOpExpr.java 468650 2006-10-28 07:03:30Z minchau $
*/
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());
}
}