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 **/
019/**
020 * Implements the CFML Function asc
021 */
022package lucee.runtime.functions.string;
023
024import lucee.runtime.PageContext;
025import lucee.runtime.exp.FunctionException;
026import lucee.runtime.exp.PageException;
027import lucee.runtime.functions.BIF;
028import lucee.runtime.op.Caster;
029
030public final class Asc extends BIF {
031
032        private static final long serialVersionUID = 8147532406904456091L;
033
034        public static double call(PageContext pc , String string) {
035                if(string.length()==0)return 0;
036                return string.charAt(0);
037        }
038        public static double call(PageContext pc , String string, double position) {
039                int pos=(int) position;
040                if(pos<1 || pos>string.length()) return 0;
041                return string.charAt(pos-1);
042        }
043
044    @Override
045        public Object invoke(PageContext pc, Object[] args) throws PageException {
046        if(args.length==1)
047                        return call(pc, Caster.toString(args[0]));
048        if(args.length==2)
049                        return call(pc, Caster.toString(args[0]), Caster.toDoubleValue(args[1]));
050        
051                throw new FunctionException(pc, "asc", 1, 2, args.length);
052        }
053}