/**
* Implements the CFML Function mid
*/
package railo.runtime.functions.string;
import railo.runtime.PageContext;
import railo.runtime.exp.ExpressionException;
import railo.runtime.ext.function.Function;
public final class Mid implements Function {
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);
}
}
}