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 mid 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 Mid extends BIF { 032 public static String call(PageContext pc , String str, double start) throws ExpressionException { 033 return call(pc,str,start,-1); 034 } 035 public static String call(PageContext pc , String str, double start, double count) throws ExpressionException { 036 int s=(int) (start-1); 037 int c=(int) count; 038 039 if(s<0) throw new ExpressionException("Parameter 2 of function mid which is now ["+(s+1)+"] must be a positive integer"); 040 if(c==-1) c=str.length(); 041 else if(c<-1) throw new ExpressionException("Parameter 3 of function mid which is now ["+c+"] must be a non-negative integer or -1 (for string length)"); 042 c+=s; 043 if(s>str.length()) return ""; 044 else if(c>=str.length())return str.substring(s); 045 else { 046 return str.substring(s,c); 047 } 048 } 049 050 @Override 051 public Object invoke(PageContext pc, Object[] args) throws PageException { 052 if(args.length==2) 053 return call(pc, Caster.toString(args[0]), Caster.toDoubleValue(args[1])); 054 if(args.length==3) 055 return call(pc, Caster.toString(args[0]), Caster.toDoubleValue(args[1]), Caster.toDoubleValue(args[2])); 056 057 throw new FunctionException(pc, "Mid", 2, 3, args.length); 058 } 059}