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 removechars
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 RemoveChars extends BIF {
032        public static String call(PageContext pc , String str, double s, double l) throws ExpressionException {
033                int start=(int) s;
034                int length=(int) l;
035                int strLength=str.length();
036                
037                // check param 2
038                if(start<1 || start>strLength)
039                        throw new ExpressionException("Parameter 2 of function removeChars which is now ["+start+"] must be a greater 0 and less than the length of the first parameter"); 
040
041                // check param 3
042                if(length<0)
043                        throw new ExpressionException("Parameter 3 of function removeChars which is now ["+length+"] must be a non-negative integer"); 
044
045                if(strLength==0) return "";
046                
047                String rtn=str.substring(0,start-1);
048                
049                if(start+length<=strLength) rtn+=str.substring(start+length-1);
050                return rtn;
051        }
052
053    @Override
054        public Object invoke(PageContext pc, Object[] args) throws PageException {
055        if(args.length==3)
056                        return call(pc, Caster.toString(args[0]), Caster.toDoubleValue(args[1]), Caster.toDoubleValue(args[2]));
057
058                throw new FunctionException(pc, "RemoveChars", 3, 3, args.length);
059        }
060}