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POFaster way to split text in Delphi TStringList
 

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  1. POFaster way to split text in Delphi TStringList
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    <p>I have an app that needs to do heavy text manipulation in a TStringList. Basically i need to split text by a delimiter ; for instance, if i have a singe line with 1000 chars and this delimiter occurs 3 times in this line, then i need to split it in 3 lines. The delimiter can contain more than one char, it can be a tag like '[test]' for example.</p> <p>I've wrote two functions to do this task with 2 different approaches, but both are slow in big amounts of text (more then 2mbytes usually).</p> <p>How can i achieve this goal in a faster way ? </p> <p>Here are both functions, both receive 2 paramaters : 'lines' which is the original tstringlist and 'q' which is the delimiter.</p> <pre><code>function splitlines(lines : tstringlist; q: string) : integer; var s, aux, ant : string; i,j : integer; flag : boolean; m2 : tstringlist; begin try m2 := tstringlist.create; m2.BeginUpdate; result := 0; for i := 0 to lines.count-1 do begin s := lines[i]; for j := 1 to length(s) do begin flag := lowercase(copy(s,j,length(q))) = lowercase(q); if flag then begin inc(result); m2.add(aux); aux := s[j]; end else aux := aux + s[j]; end; m2.add(aux); aux := ''; end; m2.EndUpdate; lines.text := m2.text; finally m2.free; end; end; function splitLines2(lines : tstringlist; q: string) : integer; var aux, p : string; i : integer; flag : boolean; begin //maux1 and maux2 are already instanced in the parent class try maux2.text := lines.text; p := ''; i := 0; flag := false; maux1.BeginUpdate; maux2.BeginUpdate; while (pos(lowercase(q),lowercase(maux2.text)) &gt; 0) and (i &lt; 5000) do begin flag := true; aux := p+copy(maux2.text,1,pos(lowercase(q),lowercase(maux2.text))-1); maux1.add(aux); maux2.text := copy(maux2.text,pos(lowercase(q),lowercase(maux2.text)),length(maux2.text)); p := copy(maux2.text,1,1); maux2.text := copy(maux2.text,2,length(maux2.text)); inc(i); end; finally result := i; maux1.EndUpdate; maux2.EndUpdate; if flag then begin maux1.add(p+maux2.text); lines.text := maux1.text; end; end; end; </code></pre>
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    1. USMarcus Adams
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      1. POFaster way to split text in Delphi TStringList
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    1. COProblem is my delimiter has more than one char, it can be an entire word, for instance.
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      1. USdelphirules
    2. COInclude all requirements in question. Btw, put the try after the constructor call.
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      1. USDavid Heffernan
    3. COYou might find my answer to this question usable: http://stackoverflow.com/questions/15424293/how-to-split-string-by-a-multi-character-delimiter/15427587#15427587
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      1. USUwe Raabe
 

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