001 /** 002 * Implements the Cold Fusion Function mid 003 */ 004 package railo.runtime.functions.string; 005 006 import railo.runtime.PageContext; 007 import railo.runtime.exp.ExpressionException; 008 import railo.runtime.ext.function.Function; 009 010 public final class Mid implements Function { 011 public static String call(PageContext pc , String str, double start) throws ExpressionException { 012 return call(pc,str,start,-1); 013 } 014 public static String call(PageContext pc , String str, double start, double count) throws ExpressionException { 015 int s=(int) (start-1); 016 int c=(int) count; 017 018 if(s<0) throw new ExpressionException("Parameter 2 of function mid which is now ["+(s+1)+"] must be a positive integer"); 019 if(c==-1) c=str.length(); 020 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)"); 021 c+=s; 022 if(s>str.length()) return ""; 023 else if(c>=str.length())return str.substring(s); 024 else { 025 return str.substring(s,c); 026 } 027 } 028 }