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A String Tokenizer Similar To strtok() in C++

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Submitted on: 10/1/2002 4:23:03 PM
By: Ty  
Level: Beginner
User Rating: By 11 Users
Compatibility:Delphi 5, Delphi 4, Pre Delphi 4

Users have accessed this article 11093 times.
 
(About the author)
 
     The following procedure acts similar to strtok in C++. Call it once with your string (S), and then everytime you call it from there on out, you can break your string apart with tokens! Included is a function StrMid() and an overload for StrMid that simulate the Mid() function in Visual Basic.

 
 
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//Declare private string for the unit
implementation
var
TokS: string

//Function To Get Characters From The String function StrMid(const sData: string; nStart: integer; nLength: integer): string; overload;
begin
Result := copy(sData, nStart, nLength);
end;

//Function To Get Characters From The String function StrMid(const sData: string; nStart: integer): string; overload;
begin
Result := copy(sData, nStart, Length(sData) - (nStart - 1));
end;

//String Tokenizer function
function StrTok(S: string; Tok: string = ''): string;
var
i,
LenTok: integer;
begin
if not(S = '') then begin //New String
TokS := S;
result := '';
Exit;
end;

if Tok = '' then begin //If No Token
result := TokS;
Exit;
end;

LenTok := Length(Tok);
for i := 0 to Length(TokS) - LenTok do begin
if StrMid(TokS, i, LenTok) = Tok then begin //If Token Found
result := StrMid(TokS, 1, i - LenTok);
TokS := StrMid(TokS, i + LenTok + 1);
Exit;
end;
end;

//If Program Reaches Here, Return The Rest Of The String
result := TokS;
TokS := '';
end;


Therefore, for example, if you defined a string:
var
S: string

and set S to 'Hello World'
S := 'Hello World';

and then call StrTok() like so:
StrTok(S);
The procedure will store the string, from now on, calling StrTok() with no S value and a token (such as a space ' '), the program will return everything in the string up to the token.

EX:
var
firstWord,
secondWord: string

begin

StrTok(S);
firstWord := StrTok('', ' ');
secondWord := StrTok('', ' ');
end;

//Doing this will break apart the string S at the token (' ') into the first word and the second word.


Good luck and use this code well!


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