| /* |
| * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
| */ |
| /* |
| * 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: Choose.java,v 1.2.4.1 2005/09/01 12:00:14 pvedula Exp $ |
| */ |
| |
| package com.sun.org.apache.xalan.internal.xsltc.compiler; |
| |
| import java.util.Enumeration; |
| import java.util.Vector; |
| |
| import com.sun.org.apache.bcel.internal.generic.BranchHandle; |
| import com.sun.org.apache.bcel.internal.generic.GOTO; |
| import com.sun.org.apache.bcel.internal.generic.IFEQ; |
| 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.ErrorMsg; |
| 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; |
| import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util; |
| import java.util.Iterator; |
| |
| /** |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * @author Morten Jorgensen |
| */ |
| final class Choose extends Instruction { |
| |
| /** |
| * Display the element contents (a lot of when's and an otherwise) |
| */ |
| public void display(int indent) { |
| indent(indent); |
| Util.println("Choose"); |
| indent(indent + IndentIncrement); |
| displayContents(indent + IndentIncrement); |
| } |
| |
| /** |
| * Translate this Choose element. Generate a test-chain for the various |
| * <xsl:when> elements and default to the <xsl:otherwise> if present. |
| */ |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| final Vector whenElements = new Vector(); |
| Otherwise otherwise = null; |
| Iterator<SyntaxTreeNode> elements = elements(); |
| |
| // These two are for reporting errors only |
| ErrorMsg error = null; |
| final int line = getLineNumber(); |
| |
| // Traverse all child nodes - must be either When or Otherwise |
| while (elements.hasNext()) { |
| SyntaxTreeNode element = elements.next(); |
| // Add a When child element |
| if (element instanceof When) { |
| whenElements.addElement(element); |
| } |
| // Add an Otherwise child element |
| else if (element instanceof Otherwise) { |
| if (otherwise == null) { |
| otherwise = (Otherwise)element; |
| } |
| else { |
| error = new ErrorMsg(ErrorMsg.MULTIPLE_OTHERWISE_ERR, this); |
| getParser().reportError(Constants.ERROR, error); |
| } |
| } |
| else if (element instanceof Text) { |
| ((Text)element).ignore(); |
| } |
| // It is an error if we find some other element here |
| else { |
| error = new ErrorMsg(ErrorMsg.WHEN_ELEMENT_ERR, this); |
| getParser().reportError(Constants.ERROR, error); |
| } |
| } |
| |
| // Make sure that there is at least one <xsl:when> element |
| if (whenElements.size() == 0) { |
| error = new ErrorMsg(ErrorMsg.MISSING_WHEN_ERR, this); |
| getParser().reportError(Constants.ERROR, error); |
| return; |
| } |
| |
| InstructionList il = methodGen.getInstructionList(); |
| |
| // next element will hold a handle to the beginning of next |
| // When/Otherwise if test on current When fails |
| BranchHandle nextElement = null; |
| Vector exitHandles = new Vector(); |
| InstructionHandle exit = null; |
| |
| Enumeration whens = whenElements.elements(); |
| while (whens.hasMoreElements()) { |
| final When when = (When)whens.nextElement(); |
| final Expression test = when.getTest(); |
| |
| InstructionHandle truec = il.getEnd(); |
| |
| if (nextElement != null) |
| nextElement.setTarget(il.append(NOP)); |
| test.translateDesynthesized(classGen, methodGen); |
| |
| if (test instanceof FunctionCall) { |
| FunctionCall call = (FunctionCall)test; |
| try { |
| Type type = call.typeCheck(getParser().getSymbolTable()); |
| if (type != Type.Boolean) { |
| test._falseList.add(il.append(new IFEQ(null))); |
| } |
| } |
| catch (TypeCheckError e) { |
| // handled later! |
| } |
| } |
| // remember end of condition |
| truec = il.getEnd(); |
| |
| // The When object should be ignored completely in case it tests |
| // for the support of a non-available element |
| if (!when.ignore()) when.translateContents(classGen, methodGen); |
| |
| // goto exit after executing the body of when |
| exitHandles.addElement(il.append(new GOTO(null))); |
| if (whens.hasMoreElements() || otherwise != null) { |
| nextElement = il.append(new GOTO(null)); |
| test.backPatchFalseList(nextElement); |
| } |
| else |
| test.backPatchFalseList(exit = il.append(NOP)); |
| test.backPatchTrueList(truec.getNext()); |
| } |
| |
| // Translate any <xsl:otherwise> element |
| if (otherwise != null) { |
| nextElement.setTarget(il.append(NOP)); |
| otherwise.translateContents(classGen, methodGen); |
| exit = il.append(NOP); |
| } |
| |
| // now that end is known set targets of exit gotos |
| Enumeration exitGotos = exitHandles.elements(); |
| while (exitGotos.hasMoreElements()) { |
| BranchHandle gotoExit = (BranchHandle)exitGotos.nextElement(); |
| gotoExit.setTarget(exit); |
| } |
| } |
| } |