/**
*
* Copyright (c) 2014, the Railo Company Ltd. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
**/
/**
* Implements the CFML Function mid
*/
package lucee.runtime.functions.string;
import lucee.runtime.PageContext;
import lucee.runtime.exp.ExpressionException;
import lucee.runtime.exp.FunctionException;
import lucee.runtime.exp.PageException;
import lucee.runtime.ext.function.BIF;
import lucee.runtime.op.Caster;
public final class Mid extends BIF {
public static String call(PageContext pc , String str, double start) throws ExpressionException {
return call(pc,str,start,-1);
}
public static String call(PageContext pc , String str, double start, double count) throws ExpressionException {
int s=(int) (start-1);
int c=(int) count;
if(s<0) throw new ExpressionException("Parameter 2 of function mid which is now ["+(s+1)+"] must be a positive integer");
if(c==-1) c=str.length();
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)");
c+=s;
if(s>str.length()) return "";
else if(c>=str.length())return str.substring(s);
else {
return str.substring(s,c);
}
}
@Override
public Object invoke(PageContext pc, Object[] args) throws PageException {
if(args.length==2)
return call(pc, Caster.toString(args[0]), Caster.toDoubleValue(args[1]));
if(args.length==3)
return call(pc, Caster.toString(args[0]), Caster.toDoubleValue(args[1]), Caster.toDoubleValue(args[2]));
throw new FunctionException(pc, "Mid", 2, 3, args.length);
}
}