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how to break column in my text file ?

Posted on 2009-04-02
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Last Modified: 2012-05-06
I have a text file very large, the problem is that my text has one line with a very long column.

I want to break column to another line after 80 caracter.

How can I do this?

Thanks
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Question by:hidrau
3 Comments
 
LVL 45

Expert Comment

by:aikimark
ID: 24051857
Is this a delimited (CSV, tab, other) text file?

How are you defining a 'column'?

Where do you need to place the results of your 'broke' column?

=====================
The general algorithm is to iterate through the length of the string, copying the chunks to another data structure, such as a TStringList.  With each iteration, you find the break point by starting 80 characters beyond your current position and inspect the characters 'backwards' (79,78,77, etc.) until you reach a word delimiter.  A word delimiter will typically be a space or hyphen.
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ThievingSix earned 500 total points
ID: 24051951
I used this code for wrapping text to 55 characters in a text file. Might be useful to you.
function TrimSpaces(Text: String): String;

begin

  Result := Text;

  While Result[1] = #32 Do Delete(Result,1,1);

  While Result[Length(Result)] = #32 Do Delete(Result,Length(Result),1);

end;
 

function StrCharPos(Text: PChar; Chars: TSysCharSet): PChar;

begin

  Result := Text;

  while Result^ <> #0 do

  begin

    if Result^ in Chars then

      Break;

    Inc(Result);

  end;

  if Result^ = #0 then

    Result := nil;

end;
 

function WrapText(const Line, BreakStr: string; BreakChars: TSysCharSet;

  MaxCol: Integer): string;

var

  P, PNewLine, PBreak: PChar;

begin

  Result := '';

  P := PChar(Line);

  PNewLine := P;

  PBreak := StrCharPos(P, BreakChars);

  while PBreak <> nil do

  begin

    if (PBreak - PNewLine + 1) > MaxCol then

    begin

      Result := Result + BreakStr;

      PNewLine := P;

    end;

    while P <= PBreak do

    begin

      Result := Result + P^;

      Inc(P);

    end;

    PBreak := StrCharPos(PBreak + 1, BreakChars);

  end;

  if StrEnd(P) - PNewLine > MaxCol then

    Result := Result + BreakStr;

  while P^ <> #0 do

  begin

    Result := Result + P^;

    Inc(P);

  end;

end;
 

procedure TfrmMain.btnFormatClick(Sender: TObject);

var

  Buffer : String;

  StringList : TStringList;

  FormatList : TStringList;

  I, J : Integer;

begin

  StringList := TStringList.Create;

  Try

    Buffer := mData.Text;

    While Pos(#13#10#13#10,Buffer) > 0 Do

      begin

      StringList.Add(Copy(Buffer,1,Pos(#13#10#13#10,Buffer) - 1));

      Buffer := Copy(Buffer,Pos(#13#10#13#10,Buffer) + 4);

    end;

    StringList.Add(Buffer);

    FormatList := TStringList.Create;

    Try

      For I := 0 To StringList.Count - 1 Do

        begin

        FormatList.Text := StringList.Strings[I];

        For J := 0 To FormatList.Count - 1 Do

          begin

          If Length(FormatList.Strings[J]) > 55 Then

            begin

            FormatList.Text := StringReplace(FormatList.Text,#13#10,#32,[rfReplaceAll]);

            FormatList.Text := WrapText(FormatList.Text,#13#10,[#32],55);

            Break;

          end;

        end;

        For J := 0 To FormatList.Count - 1 Do

          begin

          FormatList.Strings[J] := Trim(FormatList.Strings[J]);

        end;

        StringList.Strings[I] := FormatList.Text;

      end;

    Finally

      FreeAndNil(FormatList);

    end;

  mData.Text := StringReplace(StringList.Text,#13,'',[rfReplaceAll]);

  Finally

    StringList.Free;

  end;

end;

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Author Closing Comment

by:hidrau
ID: 31565845
thanks very much
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