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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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364 lines
10 KiB
ObjectPascal
364 lines
10 KiB
ObjectPascal
{-------------------------------------------------------------------------------
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The contents of this file are subject to the Mozilla Public License
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Version 1.1 (the "License"); you may not use this file except in compliance
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with the License. You may obtain a copy of the License at
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http://www.mozilla.org/MPL/
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Software distributed under the License is distributed on an "AS IS" basis,
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WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
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the specific language governing rights and limitations under the License.
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Alternatively, the contents of this file may be used under the terms of the
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GNU General Public License Version 2 or later (the "GPL"), in which case
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the provisions of the GPL are applicable instead of those above.
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If you wish to allow use of your version of this file only under the terms
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of the GPL and not to allow others to use your version of this file
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under the MPL, indicate your decision by deleting the provisions above and
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replace them with the notice and other provisions required by the GPL.
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If you do not delete the provisions above, a recipient may use your version
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of this file under either the MPL or the GPL.
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-------------------------------------------------------------------------------}
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unit SynEditTextTabExpander;
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{$I synedit.inc}
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interface
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uses
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LCLProc, Classes, SysUtils, SynEditTextBase;
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type
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// lines longer than 16383 chars, will be stored as unknown
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TLineLen = Word;
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PLineLen = ^TLineLen;
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{ TSynEditStringTabData }
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TSynEditStringTabData = class(TSynManagedStorageMem)
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private
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FRefCount: Integer;
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function GetLineLen(Index: Integer): TLineLen;
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procedure SetLineLen(Index: Integer; const AValue: TLineLen);
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public
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constructor Create;
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procedure IncRefCount;
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procedure DecRefCount;
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property RefCount: Integer read FRefCount;
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property LineLen[Index: Integer]: TLineLen read GetLineLen write SetLineLen; default;
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end;
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{ TSynEditStringTabExpander }
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TSynEditStringTabExpander = class(TSynEditStringsLinked)
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private
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FTabWidth: integer;
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FIndexOfLongestLine: Integer;
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FTabData: TSynEditStringTabData;
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FLastLineHasTab: Boolean; // Last line, parsed by GetPhysicalCharWidths
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procedure TextBufferChanged(Sender: TObject);
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procedure LineCountChanged(Sender: TSynEditStrings; AIndex, ACount : Integer);
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function ExpandedString(Index: integer): string;
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function ExpandedStringLength(Index: integer): Integer;
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protected
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function GetTabWidth : integer;
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procedure SetTabWidth(const AValue : integer);
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function GetExpandedString(Index: integer): string; override;
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function GetLengthOfLongestLine: integer; override;
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procedure DoGetPhysicalCharWidths(Line: PChar; LineLen, Index: Integer; PWidths: PPhysicalCharWidth); override;
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public
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constructor Create(ASynStringSource: TSynEditStrings);
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destructor Destroy; override;
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property LengthOfLongestLine: integer read GetLengthOfLongestLine;
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public
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property TabWidth: integer read GetTabWidth write SetTabWidth;
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end;
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implementation
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const
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// Offset to add to LengthOfLine, if Line has no tabs.
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// (Length will still be valid if tab-width changes)
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NO_TAB_IN_LINE_OFFSET = high(TLineLen) div 2;
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LINE_LEN_UNKNOWN = high(TLineLen);
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function GetHasTabs(pLine: PChar): boolean;
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begin
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if Assigned(pLine) then begin
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while (pLine^ <> #0) do begin
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if (pLine^ = #9) then break;
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Inc(pLine);
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end;
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Result := (pLine^ = #9);
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end else
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Result := FALSE;
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end;
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{ TSynEditStringTabData }
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function TSynEditStringTabData.GetLineLen(Index: Integer): TLineLen;
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begin
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Result := PLineLen(ItemPointer[Index])^;
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end;
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procedure TSynEditStringTabData.SetLineLen(Index: Integer; const AValue: TLineLen);
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begin
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PLineLen(ItemPointer[Index])^ := AValue;
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end;
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constructor TSynEditStringTabData.Create;
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begin
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inherited;
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ItemSize := SizeOf(TLineLen);
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FRefCount := 1;
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end;
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procedure TSynEditStringTabData.IncRefCount;
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begin
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inc(FRefCount);
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end;
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procedure TSynEditStringTabData.DecRefCount;
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begin
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dec(FRefCount);
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end;
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{ TSynEditStringTabExpander }
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constructor TSynEditStringTabExpander.Create(ASynStringSource: TSynEditStrings);
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begin
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FIndexOfLongestLine := -1;
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inherited Create(ASynStringSource);
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TextBufferChanged(nil);
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TabWidth := 8;
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fSynStrings.AddChangeHandler(senrLineCount, {$IFDEF FPC}@{$ENDIF}LineCountChanged);
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fSynStrings.AddChangeHandler(senrLineChange, {$IFDEF FPC}@{$ENDIF}LineCountChanged);
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fSynStrings.AddNotifyHandler(senrTextBufferChanged, {$IFDEF FPC}@{$ENDIF}TextBufferChanged);
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end;
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destructor TSynEditStringTabExpander.Destroy;
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var
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Data: TSynEditStringTabData;
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begin
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Data := TSynEditStringTabData(fSynStrings.Ranges[Self]);
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if Assigned(Data) then begin
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Data.DecRefCount;
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if Data.RefCount = 0 then begin
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fSynStrings.Ranges[Self] := nil;
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Data.Free;
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end;
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end;
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fSynStrings.RemoveChangeHandler(senrLineChange, {$IFDEF FPC}@{$ENDIF}LineCountChanged);
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fSynStrings.RemoveChangeHandler(senrLineCount, {$IFDEF FPC}@{$ENDIF}LineCountChanged);
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fSynStrings.RemoveNotifyHandler(senrTextBufferChanged, {$IFDEF FPC}@{$ENDIF}TextBufferChanged);
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inherited Destroy;
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end;
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function TSynEditStringTabExpander.GetTabWidth: integer;
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begin
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Result := FTabWidth;
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end;
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procedure TSynEditStringTabExpander.SetTabWidth(const AValue: integer);
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var
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i: integer;
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begin
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if FTabWidth = AValue then exit;
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FTabWidth := AValue;
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FIndexOfLongestLine := -1;
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for i := 0 to Count - 1 do
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if not(FTabData[i] >= NO_TAB_IN_LINE_OFFSET) then
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FTabData[i] := LINE_LEN_UNKNOWN;
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end;
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procedure TSynEditStringTabExpander.TextBufferChanged(Sender: TObject);
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var
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Data: TSynEditStringTabData;
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begin
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// Using self, instead as class, to register tab-width-data
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// other shared edits can have different tab-width
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if (Sender <> nil) and
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(FTabData = TSynEditStringTabData(NextLines.Ranges[Self]))
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then
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exit;
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if Sender <> nil then begin
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Data := TSynEditStringTabData(TSynEditStrings(Sender).Ranges[Self]);
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if Assigned(Data) then begin
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Data.DecRefCount;
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if Data.RefCount = 0 then begin
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TSynEditStrings(Sender).Ranges[Self] := nil;
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Data.Free;
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end;
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end;
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end;
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FTabData := TSynEditStringTabData(NextLines.Ranges[Self]);
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if FTabData = nil then begin
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FTabData := TSynEditStringTabData.Create;
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NextLines.Ranges[Self] := FTabData;
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end
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else
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FTabData.IncRefCount;
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end;
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procedure TSynEditStringTabExpander.LineCountChanged(Sender: TSynEditStrings; AIndex, ACount: Integer);
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var
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i: integer;
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begin
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FIndexOfLongestLine := -1;
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for i := AIndex to AIndex + ACount - 1 do
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FTabData[i] := LINE_LEN_UNKNOWN;
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end;
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function TSynEditStringTabExpander.ExpandedString(Index: integer): string;
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var
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Line: String;
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CharWidths: TPhysicalCharWidths;
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i, j, l: Integer;
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begin
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// this is only used by trimmer.lengthOfLongestLine / which is not called, if a tab module is present
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Line := fSynStrings[Index];
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if (Line = '') or (not GetHasTabs(PChar(Line))) then begin
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Result := Line;
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// xxx wrong double width // none latin ...
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//FTabData[Index] := length(Result) + NO_TAB_IN_LINE_OFFSET;
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end else begin
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CharWidths := GetPhysicalCharWidths(Pchar(Line), length(Line), Index);
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l := 0;
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for i := 0 to length(CharWidths)-1 do
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l := l + CharWidths[i];
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SetLength(Result, l);
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l := 1;
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for i := 1 to length(CharWidths) do begin
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if Line[i] <> #9 then begin
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Result[l] := Line[i];
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inc(l);
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end else begin
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for j := 1 to CharWidths[i-1] do begin
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Result[l] := ' ';
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inc(l);
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end;
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end;
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end;
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FTabData[Index] := length(Result);
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end;
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end;
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function TSynEditStringTabExpander.ExpandedStringLength(Index: integer): Integer;
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var
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Line: String;
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CharWidths: TPhysicalCharWidths;
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i: Integer;
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begin
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Line := fSynStrings[Index];
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if (Line = '') then begin
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Result := 0;
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FTabData[Index] := Result + NO_TAB_IN_LINE_OFFSET;
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end else begin
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i := length(Line);
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SetLength(CharWidths, i);
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DoGetPhysicalCharWidths(Pchar(Line), i, Index, @CharWidths[0]);
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Result := 0;
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for i := 0 to length(CharWidths)-1 do
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Result := Result + CharWidths[i];
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if FLastLineHasTab then // FLastLineHasTab is set by GetPhysicalCharWidths
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FTabData[Index] := Result
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else
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FTabData[Index] := Result + NO_TAB_IN_LINE_OFFSET;
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end;
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end;
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function TSynEditStringTabExpander.GetExpandedString(Index: integer): string;
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begin
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if (Index >= 0) and (Index < Count) then begin
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if FTabData[Index] >= NO_TAB_IN_LINE_OFFSET then
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Result := fSynStrings[Index]
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else
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Result := ExpandedString(Index);
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end else
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Result := '';
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end;
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procedure TSynEditStringTabExpander.DoGetPhysicalCharWidths(Line: PChar;
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LineLen, Index: Integer; PWidths: PPhysicalCharWidth);
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var
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HasTab: Boolean;
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i, j: Integer;
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begin
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inherited DoGetPhysicalCharWidths(Line, LineLen, Index, PWidths);
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HasTab := False;
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j := 0;
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for i := 0 to LineLen - 1 do begin
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if PWidths^ <> 0 then begin
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if Line^ = #9 then begin
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PWidths^ := FTabWidth - (j mod FTabWidth);
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HasTab := True;
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end;
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j := j + PWidths^;
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end;
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inc(Line);
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inc(PWidths);
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end;
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FLastLineHasTab := HasTab;
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end;
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function TSynEditStringTabExpander.GetLengthOfLongestLine: integer;
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var
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Line: String;
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CharWidths: TPhysicalCharWidths;
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n, m: Integer;
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//var
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i, j: integer;
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begin
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if (fIndexOfLongestLine >= 0) and (fIndexOfLongestLine < Count) then begin
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Result := FTabData[fIndexOfLongestLine];
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if Result >= NO_TAB_IN_LINE_OFFSET then Result := Result - NO_TAB_IN_LINE_OFFSET;
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exit;
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end;
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Result := 0;
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m := 0;
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for i := 0 to Count - 1 do begin
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j := FTabData[i];
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if j = LINE_LEN_UNKNOWN then begin
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// embedd a copy of ExpandedStringLength
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// allows to re-use CharWidths
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Line := fSynStrings[i];
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j := 0;
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if (Line = '') then begin
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FTabData[i] := j + NO_TAB_IN_LINE_OFFSET;
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end else begin
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n := length(Line);
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if n > m then begin
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SetLength(CharWidths, n);
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m := n;
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end;
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DoGetPhysicalCharWidths(Pchar(Line), n, i, @CharWidths[0]);
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for m := 0 to n-1 do
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j := j + CharWidths[m];
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if FLastLineHasTab then // FLastLineHasTab is set by GetPhysicalCharWidths
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FTabData[i] := j
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else
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FTabData[i] := j + NO_TAB_IN_LINE_OFFSET;
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end;
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end
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else
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if j >= NO_TAB_IN_LINE_OFFSET then
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j := j - NO_TAB_IN_LINE_OFFSET;
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if j > Result then begin
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Result := j;
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fIndexOfLongestLine := i;
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end;
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end;
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end;
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end.
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