Title: Parsing strings
Question: How can I extract the tokens (parse) from a given string?
Answer:
{
With this code you can extract tokens from a string.
I've provided sets for Comma Seperated fields (CS_CSV), Tab (CS_Tab) and ofcource for spaces (CS_SPACE).
Warning: This code does not support "quoted strings" tokens.
}
Type CharSet = set of char;
const CS_Space : CharSet = [' '];
const CS_CSV : CharSet = [',', ' '];
const CS_STab : CharSet = [#9, ' '];
function GetToken(var InTxt : String; SpaceChar : CharSet) : String;
var
i : Integer;
begin
{ Find first SpaceCharacter }
i:=1;
While (i { Get text upto that spacechar }
Result := Copy(InTxt,1,i-1);
{ Remove fetched part from InTxt }
Delete(InTxt,1,i);
{ Delete SpaceChars in front of InTxt }
i:=1;
While (i Delete(InTxt,1,i-1);
end;
{--------------------}
{ Usage example: }
var
s : String;
begin
s:='Money, 600, Box, Walk_On_Moon';
Memo1.Lines.Add('"'+GetToken(s, CS_CSV) +'"');
Memo1.Lines.Add('"'+GetToken(s, CS_CSV) +'"');
Memo1.Lines.Add('"'+GetToken(s, CS_CSV) +'"');
Memo1.Lines.Add('"'+GetToken(s, CS_CSV) +'"');
end;