| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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. |
| */ |
| |
| package com.sun.org.apache.xalan.internal.xsltc.compiler; |
| |
| import com.sun.org.apache.bcel.internal.generic.GOTO; |
| import com.sun.org.apache.bcel.internal.generic.InstructionHandle; |
| import com.sun.org.apache.bcel.internal.generic.InstructionList; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| */ |
| final class AlternativePattern extends Pattern { |
| private final Pattern _left; |
| private final Pattern _right; |
| |
| /** |
| * Construct an alternative pattern. The method <code>setParent</code> |
| * should not be called in this case. |
| */ |
| public AlternativePattern(Pattern left, Pattern right) { |
| _left = left; |
| _right = right; |
| } |
| |
| public void setParser(Parser parser) { |
| super.setParser(parser); |
| _left.setParser(parser); |
| _right.setParser(parser); |
| } |
| |
| public Pattern getLeft() { |
| return _left; |
| } |
| |
| public Pattern getRight() { |
| return _right; |
| } |
| |
| /** |
| * The type of an '|' is not really defined, hence null is returned. |
| */ |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| _left.typeCheck(stable); |
| _right.typeCheck(stable); |
| return null; |
| } |
| |
| public double getPriority() { |
| double left = _left.getPriority(); |
| double right = _right.getPriority(); |
| |
| if (left < right) |
| return(left); |
| else |
| return(right); |
| } |
| |
| public String toString() { |
| return "alternative(" + _left + ", " + _right + ')'; |
| } |
| |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final InstructionList il = methodGen.getInstructionList(); |
| |
| _left.translate(classGen, methodGen); |
| final InstructionHandle gotot = il.append(new GOTO(null)); |
| il.append(methodGen.loadContextNode()); |
| _right.translate(classGen, methodGen); |
| |
| _left._trueList.backPatch(gotot); |
| _left._falseList.backPatch(gotot.getNext()); |
| |
| _trueList.append(_right._trueList.add(gotot)); |
| _falseList.append(_right._falseList); |
| } |
| } |