{-------------------------------------------------------------------------------
The contents of this file are subject to the Mozilla Public License
Version 1.1 (the "License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/

Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
the specific language governing rights and limitations under the License.

The Original Code is: SynEditAutoComplete.pas, released 2000-06-25.

The Initial Author of the Original Code is Michael Hieke.
Portions written by Michael Hieke are Copyright 2000 Michael Hieke.
Portions written by Cyrille de Brebisson (from mwCompletionProposal.pas) are
Copyright 1999 Cyrille de Brebisson.
All Rights Reserved.

Contributors to the SynEdit and mwEdit projects are listed in the
Contributors.txt file.

Alternatively, the contents of this file may be used under the terms of the
GNU General Public License Version 2 or later (the "GPL"), in which case
the provisions of the GPL are applicable instead of those above.
If you wish to allow use of your version of this file only under the terms
of the GPL and not to allow others to use your version of this file
under the MPL, indicate your decision by deleting the provisions above and
replace them with the notice and other provisions required by the GPL.
If you do not delete the provisions above, a recipient may use your version
of this file under either the MPL or the GPL.

$Id: SynEditAutoComplete.pas,v 1.1.1.1 2000/07/08 15:54:05 mghie Exp $

You may retrieve the latest version of this file at the SynEdit home page,
located at http://SynEdit.SourceForge.net

Known Issues:
-------------------------------------------------------------------------------}

unit SynEditAutoComplete;

{$I SynEdit.inc}

interface

uses
  Windows, Classes, SynEdit, SynEditKeyCmds;

type
  TCustomSynAutoComplete = class(TComponent)
  protected
    fAutoCompleteList: TStrings;
    fCompletions: TStrings;
    fCompletionComments: TStrings;
    fCompletionValues: TStrings;
    fEditor: TCustomSynEdit;
    fEditors: TList;
    fEOTokenChars: string;
    fCaseSensitive: boolean;
    fParsed: boolean;
    procedure CompletionListChanged(Sender: TObject);
    function GetCompletions: TStrings;
    function GetCompletionComments: TStrings;
    function GetCompletionValues: TStrings;
    function GetEditorCount: integer;
    function GetNthEditor(Index: integer): TCustomSynEdit;
    procedure ParseCompletionList; virtual;
    procedure SetAutoCompleteList(Value: TStrings); virtual;
    procedure SetEditor(Value: TCustomSynEdit);
    procedure SynEditCommandHandler(Sender: TObject; AfterProcessing: boolean;
      var Handled: boolean; var Command: TSynEditorCommand; var AChar: char;
      Data: pointer; HandlerData: pointer);
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;

    procedure AddCompletion(AToken, AValue, AComment: string);
    function AddEditor(AEditor: TCustomSynEdit): boolean;
    procedure Execute(AEditor: TCustomSynEdit); virtual;
    procedure ExecuteCompletion(AToken: string; AEditor: TCustomSynEdit);
      virtual;
    procedure Loaded; override;
    procedure Notification(AComponent: TComponent; Operation: TOperation);
      override;
    function RemoveEditor(AEditor: TCustomSynEdit): boolean;
  public
    property AutoCompleteList: TStrings read fAutoCompleteList
      write SetAutoCompleteList;
    property CaseSensitive: boolean read fCaseSensitive write fCaseSensitive;
    property Completions: TStrings read GetCompletions;
    property CompletionComments: TStrings read GetCompletionComments;
    property CompletionValues: TStrings read GetCompletionValues;
    property Editor: TCustomSynEdit read fEditor write SetEditor;
    property EditorCount: integer read GetEditorCount;
    property Editors[Index: integer]: TCustomSynEdit read GetNthEditor;
    property EndOfTokenChr: string read fEOTokenChars write fEOTokenChars;
  end;

  TSynAutoComplete = class(TCustomSynAutoComplete)
  published
    property AutoCompleteList;
    property CaseSensitive;
    property Editor;
    property EndOfTokenChr;
  end;

implementation

uses
  SysUtils, Menus;

{ TCustomSynAutoComplete }

procedure TCustomSynAutoComplete.AddCompletion(AToken, AValue, AComment: string);
begin
  if AToken <> '' then begin
    fCompletions.Add(AToken);
    fCompletionComments.Add(AComment);
    fCompletionValues.Add(AValue);
  end;
end;

function TCustomSynAutoComplete.AddEditor(AEditor: TCustomSynEdit): boolean;
var
  i: integer;
begin
  if AEditor <> nil then begin
    i := fEditors.IndexOf(AEditor);
    if i = -1 then begin
      AEditor.FreeNotification(Self);
      fEditors.Add(AEditor);
      if ComponentState * [csDesigning, csLoading] = [] then
        AEditor.RegisterCommandHandler(SynEditCommandHandler, nil);
    end;
    Result := TRUE;
  end else
    Result := FALSE;
end;

procedure TCustomSynAutoComplete.CompletionListChanged(Sender: TObject);
begin
  fParsed := FALSE;
end;

constructor TCustomSynAutoComplete.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  fAutoCompleteList := TStringList.Create;
  TStringList(fAutoCompleteList).OnChange := CompletionListChanged;
  fCompletions := TStringList.Create;
  fCompletionComments := TStringList.Create;
  fCompletionValues := TStringList.Create;
  fEditors := TList.Create;
  fEOTokenChars := '()[]{}.';
end;

destructor TCustomSynAutoComplete.Destroy;
begin
  fEditors.Free;
  fCompletions.Free;
  fCompletionComments.Free;
  fCompletionValues.Free;
  fAutoCompleteList.Free;
  inherited Destroy;
end;

procedure TCustomSynAutoComplete.Execute(AEditor: TCustomSynEdit);
var
  s: string;
  i, j: integer;
begin
  if AEditor <> nil then begin
    // get token
    s := AEditor.LineText;
    j := AEditor.CaretX;
    i := j - 1;
    if i <= Length(s) then begin
      while (i > 0) and (s[i] > ' ') and (Pos(s[i], fEOTokenChars) = 0) do
        Dec(i);
      Inc(i);
      s := Copy(s, i, j - i);
      ExecuteCompletion(s, AEditor);
    end;
  end;
end;

procedure TCustomSynAutoComplete.ExecuteCompletion(AToken: string;
  AEditor: TCustomSynEdit);
var
  i, j, Len, IndentLen: integer;
  s: string;
  IdxMaybe, NumMaybe: integer;
  p: TPoint;
  NewCaretPos: boolean;
  Temp: TStringList;
begin
  if not fParsed then
    ParseCompletionList;
  Len := Length(AToken);
  if (Len > 0) and (AEditor <> nil) and not AEditor.ReadOnly
    and (fCompletions.Count > 0)
  then begin
    // find completion for this token - not all chars necessary if unambiguous
    i := fCompletions.Count - 1;
    IdxMaybe := -1;
    NumMaybe := 0;
    if fCaseSensitive then begin
      while i > -1 do begin
        s := fCompletions[i];
        if AnsiCompareStr(s, AToken) = 0 then
          break
        else if AnsiCompareStr(Copy(s, 1, Len), AToken) = 0 then begin
          Inc(NumMaybe);
          IdxMaybe := i;
        end;
        Dec(i);
      end;
    end else begin
      while i > -1 do begin
        s := fCompletions[i];
        if AnsiCompareText(s, AToken) = 0 then
          break
        else if AnsiCompareText(Copy(s, 1, Len), AToken) = 0 then begin
          Inc(NumMaybe);
          IdxMaybe := i;
        end;
        Dec(i);
      end;
    end;
    if (i = -1) and (NumMaybe = 1) then
      i := IdxMaybe;
    if i > -1 then begin
      // select token in editor
      p := AEditor.CaretXY;
      AEditor.BlockBegin := Point(p.x - Len, p.y);
      AEditor.BlockEnd := p;
      // indent the completion string if necessary, determine the caret pos
      IndentLen := p.x - Len - 1;
      p := AEditor.BlockBegin;
      NewCaretPos := FALSE;
      Temp := TStringList.Create;
      try
        Temp.Text := fCompletionValues[i];
        // indent lines
        if (IndentLen > 0) and (Temp.Count > 1) then begin
          s := StringOfChar(' ', IndentLen);
          for i := 1 to Temp.Count - 1 do
            Temp[i] := s + Temp[i];
        end;
        // find first '|' and use it as caret position
        for i := 0 to Temp.Count - 1 do begin
          s := Temp[i];
          j := Pos('|', s);
          if j > 0 then begin
            Delete(s, j, 1);
            Temp[i] := s;
            if j > 1 then
              Dec(j);
            NewCaretPos := TRUE;
            Inc(p.y, i);
            if i = 0 then
              Inc(p.x, j)
            else
              p.x := j;
            break;
          end;
        end;
        s := Temp.Text;
      finally
        Temp.Free;
      end;
      // replace the selected text and position the caret
      AEditor.SelText := s;
      if NewCaretPos then
        AEditor.CaretXY := p;
    end;
  end;
end;

function TCustomSynAutoComplete.GetCompletions: TStrings;
begin
  if not fParsed then
    ParseCompletionList;
  Result := fCompletions;
end;

function TCustomSynAutoComplete.GetCompletionComments: TStrings;
begin
  if not fParsed then
    ParseCompletionList;
  Result := fCompletionComments;
end;

function TCustomSynAutoComplete.GetCompletionValues: TStrings;
begin
  if not fParsed then
    ParseCompletionList;
  Result := fCompletionValues;
end;

function TCustomSynAutoComplete.GetEditorCount: integer;
begin
  Result := fEditors.Count;
end;

function TCustomSynAutoComplete.GetNthEditor(Index: integer): TCustomSynEdit;
begin
  if (Index >= 0) and (Index < fEditors.Count) then
    Result := fEditors[Index]
  else
    Result := nil;
end;

procedure TCustomSynAutoComplete.Loaded;
var
  i: integer;
  O: TObject;
begin
  inherited Loaded;
  for i := 0 to fEditors.Count - 1 do begin
    O := TObject(fEditors[i]);
    (O as TCustomSynEdit).RegisterCommandHandler(SynEditCommandHandler, nil);
  end;
end;

procedure TCustomSynAutoComplete.Notification(AComponent: TComponent;
  Operation: TOperation);
var
  i: integer;
begin
  inherited Notification(AComponent, Operation);
  if Operation = opRemove then begin
    i := fEditors.IndexOf(AComponent);
    if i > -1 then
      RemoveEditor(AComponent as TCustomSynEdit);
  end;
end;

procedure TCustomSynAutoComplete.ParseCompletionList;
var
  BorlandDCI: boolean;
  i, j, Len: integer;
  s, sCompl, sComment, sComplValue: string;

  procedure SaveEntry;
  begin
    fCompletions.Add(sCompl);
    sCompl := '';
    fCompletionComments.Add(sComment);
    sComment := '';
    fCompletionValues.Add(sComplValue);
    sComplValue := '';
  end;
  
begin
  fCompletions.Clear;
  fCompletionComments.Clear;
  fCompletionValues.Clear;

  if fAutoCompleteList.Count > 0 then begin
    s := fAutoCompleteList[0];
    BorlandDCI := (s <> '') and (s[1] = '[');

    sCompl := '';
    sComment := '';
    sComplValue := '';
    for i := 0 to fAutoCompleteList.Count - 1 do begin
      s := fAutoCompleteList[i];
      Len := Length(s);
      if BorlandDCI then begin
        // the style of the Delphi32.dci file
        if (Len > 0) and (s[1] = '[') then begin
          // save last entry
          if sCompl <> '' then
            SaveEntry;
          // new completion entry
          j := 2;
          while (j <= Len) and (s[j] > ' ') do
            Inc(j);
          sCompl := Copy(s, 2, j - 2);
          // start of comment in DCI file
          while (j <= Len) and (s[j] <= ' ') do
            Inc(j);
          if (j <= Len) and (s[j] = '|') then
            Inc(j);
          while (j <= Len) and (s[j] <= ' ') do
            Inc(j);
          sComment := Copy(s, j, Len);
          if sComment[Length(sComment)] = ']' then
            SetLength(sComment, Length(sComment) - 1);
        end else begin
          if sComplValue <> '' then
            sComplValue := sComplValue + #13#10;
          sComplValue := sComplValue + s;
        end;
      end else begin
        // the original style
        if (Len > 0) and (s[1] <> '=') then begin
          // save last entry
          if sCompl <> '' then
            SaveEntry;
          // new completion entry
          sCompl := s;
        end else if (Len > 0) and (s[1] = '=') then begin
          if sComplValue <> '' then
            sComplValue := sComplValue + #13#10;
          sComplValue := sComplValue + Copy(s, 2, Len);
        end;
      end;
    end;
  end;
end;

function TCustomSynAutoComplete.RemoveEditor(AEditor: TCustomSynEdit): boolean;
var
  i: integer;
begin
  if AEditor <> nil then begin
    i := fEditors.IndexOf(AEditor);
    if i > -1 then begin
      if fEditor = AEditor then
        fEditor := nil;
      fEditors.Delete(i);
      if ComponentState * [csDesigning, csLoading] = [] then
        AEditor.UnregisterCommandHandler(SynEditCommandHandler);
    end;
  end;
  Result := FALSE;
end;

procedure TCustomSynAutoComplete.SetAutoCompleteList(Value: TStrings);
begin
  fAutoCompleteList.Assign(Value);
  fParsed := FALSE;
end;

procedure TCustomSynAutoComplete.SetEditor(Value: TCustomSynEdit);
begin
  if Value <> fEditor then begin
    if fEditor <> nil then
      RemoveEditor(fEditor);
    fEditor := nil;
    if (Value <> nil) and AddEditor(Value) then
      fEditor := Value;
  end;
end;

procedure TCustomSynAutoComplete.SynEditCommandHandler(Sender: TObject;
  AfterProcessing: boolean; var Handled: boolean;
  var Command: TSynEditorCommand; var AChar: char; Data: pointer;
  HandlerData: pointer);
begin
  if not AfterProcessing and not Handled and (Command = ecAutoCompletion) then
  begin
    Handled := TRUE;
    Execute(Sender as TCustomSynEdit);
  end;
end;

end.

