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 insert
021 */
022package lucee.runtime.functions.string;
023
024import lucee.runtime.PageContext;
025import lucee.runtime.exp.ExpressionException;
026import lucee.runtime.exp.FunctionException;
027import lucee.runtime.exp.PageException;
028import lucee.runtime.functions.BIF;
029import lucee.runtime.op.Caster;
030
031public final class Insert extends BIF {
032
033        private static final long serialVersionUID = 5926183314989306282L;
034
035        public static String call(PageContext pc , String sub, String str, double pos) throws ExpressionException {
036                int p=(int) pos;
037                if(p<0 || p>str.length())
038                        throw new ExpressionException("third parameter of the function insert, must be between 0 and "+str.length()+" now ["+(p)+"]");
039                StringBuilder sb=new StringBuilder(str.length()+sub.length());
040                
041                return sb.append(str.substring(0,p)).append(sub).append(str.substring(p)).toString();
042        }
043
044    @Override
045        public Object invoke(PageContext pc, Object[] args) throws PageException {
046        if(args.length==3)
047                        return call(pc, Caster.toString(args[0]), Caster.toString(args[1]), Caster.toDoubleValue(args[2]));
048        
049                throw new FunctionException(pc, "Insert", 2, 3, args.length);
050        }
051}