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...split a string *VERY* fast using delimiters (function)?
Autor: Juhani Suhonen
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Tip Rating (29):  
     


{
 VERY fast split function
 this function returns part of a string based on
 constant defineable delimiters, such as ";". So
 SPLIT('this is a test ',' ',3) = 'is' or
 SPLIT('data;another;yet;again;more;',';',4) = 'yet'

 Split function shifts index integer by two to
 be compatible with commonly used PD split function
 gpl 2004 / Juhani Suhonen
}

function split(input: string; schar: Char; s: Integer): string;
var
  
c: array of Integer;
  b, t: Integer;
begin
  
Dec(s, 2);  // for compatibility with very old & slow split function
  
t := 0;     // variable T needs to be initialized...
  
setlength(c, Length(input));
  for b := 0 to pred(High(c)) do 
  begin
    
c[b + 1] := posex(schar, input, succ(c[b]));
    // BREAK LOOP if posex looped (position before previous)
    // or wanted position reached..
    
if (c[b + 1] < c[b]) or (s < t) then break 
    else 
      
Inc(t);
  end;
  Result := Copy(input, succ(c[s]), pred(c[s + 1] - c[s]));
end;


 

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