Pascal Diff, Version 0.4a

{
  main.pas

  This file is part of the Diff.pas sample application.
  Info at http://flocke.vssd.de/prog/code/pascal/pasdiff/

  Copyright (C) 2005, 2006 Volker Siebert <flocke@vssd.de>
  All rights reserved.
}

unit main;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    OpenDialog1: TOpenDialog;
    Memo2: TMemo;
    Panel1: TPanel;
    Edit1: TEdit;
    Button1: TButton;
    Edit2: TEdit;
    Button2: TButton;
    Button3: TButton;
    CheckBox1: TCheckBox;
    CheckBox2: TCheckBox;
    CheckBox3: TCheckBox;
    CheckBox4: TCheckBox;
    ComboBox1: TComboBox;
    Label1: TLabel;
    procedure FormShow(Sender: TObject);
    procedure FormResize(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

uses
  Diff;

const
  MaxDisplayedBlockOfText = 2;

procedure TForm1.Button1Click(Sender: TObject);
begin
  OpenDialog1.FileName := Edit1.Text;
  if OpenDialog1.Execute then
    Edit1.Text := OpenDialog1.FileName;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  OpenDialog1.FileName := Edit2.Text;
  if OpenDialog1.Execute then
    Edit2.Text := OpenDialog1.FileName;
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  File1, File2: TStringList;
  Differ: TStandardTextComparer;
  Loops, idx: integer;
  Diff: TDifference;
  Line1, Line2: integer;
  Fmt: string;
  Time1, Time2: Int64;

  function PrintLines1(Upto: integer): integer;
  var
    Cnt: integer;
  begin
    Result := Memo1.Lines.Count;

    if Upto - Line1 > 2 * MaxDisplayedBlockOfText + 1 then
    begin
      for Cnt := 1 to MaxDisplayedBlockOfText do
      begin
        Memo1.Lines.Add(Format(Fmt, [Line1 + 1]) + File1[Line1]);
        inc(Line1);
      end;

      Memo1.Lines.Add('...');
      Line1 := Upto - MaxDisplayedBlockOfText;
    end;

    while Line1 < Upto do
    begin
      Memo1.Lines.Add(Format(Fmt, [Line1 + 1]) + File1[Line1]);
      inc(Line1);
    end;

    Result := Memo1.Lines.Count - Result;
  end;

  function PrintLines2(Upto: integer): integer;
  var
    Cnt: integer;
  begin
    Result := Memo2.Lines.Count;

    if Upto - Line2 > 2 * MaxDisplayedBlockOfText + 1 then
    begin
      for Cnt := 1 to MaxDisplayedBlockOfText do
      begin
        Memo2.Lines.Add(Format(Fmt, [Line2 + 1]) + File2[Line2]);
        inc(Line2);
      end;

      Memo2.Lines.Add('...');
      Line2 := Upto - MaxDisplayedBlockOfText;
    end;

    while Line2 < Upto do
    begin
      Memo2.Lines.Add(Format(Fmt, [Line2 + 1]) + File1[Line2]);
      inc(Line2);
    end;

    Result := Memo2.Lines.Count - Result;
  end;

  procedure AddEmpty(Memo: TCustomMemo; cnt: integer);
  begin
    while cnt > 0 do
    begin
      Memo.Lines.Add('');
      dec(cnt);
    end;
  end;

begin
  try
    File1 := TStringList.Create;
    File2 := TStringList.Create;
    try
      File1.LoadFromFile(Edit1.Text);
      File2.LoadFromFile(Edit2.Text);

      Differ := TStandardTextComparer.Create;
      try
        Differ.IgnoreCase := CheckBox1.Checked;
        Differ.IgnoreSpaces := CheckBox2.Checked;
        Differ.SpacesAsOne := CheckBox3.Checked;
        if CheckBox4.Checked then
          Differ.Heuristic := 50
        else
          Differ.Heuristic := 0;

        Loops := StrToIntDef(Trim(ComboBox1.Items[ComboBox1.ItemIndex]), 10);

        QueryPerformanceCounter(Time1);

        for idx := 1 to Loops do
        begin
          Differ.Clear;
          Differ.Compare(File1, File2);
        end;

        QueryPerformanceCounter(Time2);
        Time1 := Time2 - Time1;
        QueryPerformanceFrequency(Time2);
        Time1 := (Time1 * 1000) div Time2;

        Memo1.Lines.BeginUpdate;
        Memo2.Lines.BeginUpdate;
        try
          Memo1.Lines.Clear;
          Memo2.Lines.Clear;

          Memo1.Lines.Add(Format('Durchläufe: %d', [Loops]));
          Memo1.Lines.Add(Format('Unterschiede: %d', [Differ.Count]));
          Memo1.Lines.Add('');
          Memo1.Lines.Add(Format('Datei: %s', [Edit1.Text]));
          Memo1.Lines.Add(Format('Zeilen: %d', [File1.Count]));
          Memo1.Lines.Add('');

          Memo2.Lines.Add(Format('Laufzeit: %d ms', [Time1]));
          Memo2.Lines.Add(Format('Durchläufe/s: %d', [Loops * 1000 div Time1]));
          Memo2.Lines.Add('');
          Memo2.Lines.Add(Format('Datei: %s', [Edit2.Text]));
          Memo2.Lines.Add(Format('Zeilen: %d', [File2.Count]));
          Memo2.Lines.Add('');

          Memo1.Lines.EndUpdate;
          Memo2.Lines.EndUpdate;

          Application.ProcessMessages;

          Memo1.Update;
          Memo2.Update;

          Application.ProcessMessages;

          Memo1.Lines.BeginUpdate;
          Memo2.Lines.BeginUpdate;

          Application.ProcessMessages;

          Line1 := File1.Count;
          Line2 := File2.Count;
          idx := 1;
          while (Line1 > 9) or (Line2 > 9) do
          begin
            inc(idx);
            Line1 := Line1 div 10;
            Line2 := Line2 div 10;
          end;

          Fmt := Format('%%%d.%dd| ', [idx, idx]);

          Line1 := 0;
          Line2 := 0;

          for idx := 0 to Differ.Count - 1 do
          begin
            Diff := Differ.Diff[idx];

            PrintLines1(Diff.Left.Start);
            PrintLines2(Diff.Right.Start);

            AddEmpty(Memo2, PrintLines1(Diff.Left.Stop));
            AddEmpty(Memo1, PrintLines2(Diff.Right.Stop));

            Application.ProcessMessages;
          end;

          PrintLines1(File1.Count);
          PrintLines2(File2.Count);
        finally
          Memo2.Lines.EndUpdate;
          Memo1.Lines.EndUpdate;
        end;
      finally
        Differ.Free;
      end;
    finally
      File2.Free;
      File1.Free;
    end;
  except
    on E: Exception do
      MessageDlg(E.Message, mtError, [mbOk], 0)
    else
      raise;
  end;
end;

procedure TForm1.FormResize(Sender: TObject);
var
  d, w, h: integer;
begin
  Panel1.Width := ClientWidth;

  d := Memo1.Left;
  w := (ClientWidth - 3 * d) div 2;
  h := ClientHeight - Memo1.Top - Edit1.Top;

  Memo1.Width := w;
  Memo2.Left := d + w + d;
  Memo2.Width := w;
  Memo1.Height := h;
  Memo2.Height := h;
end;

procedure TForm1.FormShow(Sender: TObject);
begin
  Constraints.MinWidth := Width;
  Constraints.MinHeight := Height;
  
  ComboBox1.ItemIndex := 0;
end;

end.