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.attributes.impl;
020
021import lucee.transformer.bytecode.cast.CastBoolean;
022import lucee.transformer.bytecode.expression.Expression;
023import lucee.transformer.bytecode.literal.LitBoolean;
024import lucee.transformer.bytecode.statement.tag.Attribute;
025import lucee.transformer.bytecode.statement.tag.Tag;
026import lucee.transformer.cfml.attributes.AttributeEvaluator;
027import lucee.transformer.cfml.attributes.AttributeEvaluatorException;
028import lucee.transformer.library.tag.TagLibTag;
029
030/**
031 * Attribute Evaluator for the tag Function
032 */
033public final class Function implements AttributeEvaluator {
034
035        /**
036         * @see lucee.transformer.cfml.attributes.AttributeEvaluator#evaluate(lucee.transformer.library.tag.TagLibTag, org.w3c.dom.Element)
037         */
038        public TagLibTag evaluate( TagLibTag tagLibTag, Tag tag) throws AttributeEvaluatorException {
039                tagLibTag.setParseBody(false);
040                
041                Attribute attrOutput = tag.getAttribute("output");
042                if(attrOutput==null) return tagLibTag;
043                
044                Expression expr = CastBoolean.toExprBoolean(attrOutput.getValue());
045                
046                if(!(expr instanceof LitBoolean))
047                        throw new AttributeEvaluatorException("Attribute output of the Tag Function, must be a literal boolean value (true or false)");
048                boolean output = ((LitBoolean)expr).getBooleanValue();
049                if(output)
050                        tagLibTag.setParseBody(true);
051                
052                return tagLibTag;
053        }
054}