001/**
002 *
003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
004 *
005 * This library is free software; you can redistribute it and/or
006 * modify it under the terms of the GNU Lesser General Public
007 * License as published by the Free Software Foundation; either 
008 * version 2.1 of the License, or (at your option) any later version.
009 * 
010 * This library is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013 * Lesser General Public License for more details.
014 * 
015 * You should have received a copy of the GNU Lesser General Public 
016 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
017 * 
018 **/
019package lucee.transformer.cfml.evaluator.impl;
020
021import lucee.transformer.bytecode.statement.tag.Tag;
022import lucee.transformer.bytecode.statement.tag.TagIf;
023import lucee.transformer.bytecode.util.ASMUtil;
024import lucee.transformer.cfml.evaluator.EvaluatorException;
025import lucee.transformer.cfml.evaluator.EvaluatorSupport;
026import lucee.transformer.library.tag.TagLibTag;
027
028
029
030/**
031 *
032 * Prueft den Kontext des Tag else.
033 * Das Tag <code>else</code> darf nur direkt innerhalb des Tag <code>if</code> liegen.
034 * Dem Tag <code>else</code> darf, innerhalb des Tag <code>if</code>, kein Tag <code>if</code> nachgestellt sein.
035 * Das Tag darf auch nur einmal vorkommen innerhalb des Tag if. 
036 */
037public final class Else extends EvaluatorSupport {
038
039        /**
040         * @see lucee.transformer.cfml.evaluator.EvaluatorSupport#evaluate(org.w3c.dom.Element, lucee.transformer.library.tag.TagLibTag)
041         */
042        public void evaluate(Tag tag, TagLibTag libTag) throws EvaluatorException {
043                String ns=libTag.getTagLib().getNameSpaceAndSeparator();
044                        String ifName=ns+"if";
045        
046                // check if tag is direct inside if
047                if(!ASMUtil.isParentTag(tag, TagIf.class)) {
048                        throw new EvaluatorException("Wrong Context, tag "+libTag.getFullName()+" must be direct inside a "+ifName+" tag");
049                }
050                        
051                // check if is there a elseif tag after this tag
052                if(ASMUtil.hasSisterTagAfter(tag,"elseif"))
053                        throw new EvaluatorException("Wrong Context, tag cfelseif can't be after tag else");
054                // check if tag else is unique
055                if(ASMUtil.hasSisterTagWithSameName(tag))
056                 throw new EvaluatorException("Wrong Context, tag else must be once inside the tag if");
057                
058        }
059
060}