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 left 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 Left extends BIF { 032 033 private static final long serialVersionUID = 571667661130843970L; 034 035 public static String call(PageContext pc, String str, double number) throws ExpressionException { 036 int len = (int)number; 037 if (len == 0) throw new ExpressionException("parameter 2 of the function left can not be 0"); 038 if (Math.abs(len) >= str.length()) return str; 039 if (len < 0) len = str.length() + len; 040 return str.substring(0,len); 041 } 042 043 @Override 044 public Object invoke(PageContext pc, Object[] args) throws PageException { 045 if(args.length==2) 046 return call(pc, Caster.toString(args[0]), Caster.toDoubleValue(args[1])); 047 throw new FunctionException(pc, "Left", 2, 2, args.length); 048 } 049}