| /* |
| * @(#)$Id$ |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xalan" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 2001, Sun |
| * Microsystems., http://www.sun.com. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * @author Morten Jorgensen |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import java.util.Vector; |
| import java.util.Enumeration; |
| |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import org.apache.bcel.generic.*; |
| import org.apache.xalan.xsltc.compiler.util.*; |
| |
| 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; |
| Enumeration 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.hasMoreElements()) { |
| Object element = elements.nextElement(); |
| // 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); |
| } |
| } |
| } |