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{
***************************************************************************
* *
* This source is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This code is distributed in the hope that it will be useful, but *
* WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* General Public License for more details. *
* *
* A copy of the GNU General Public License is available on the World *
* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
* obtain it by writing to the Free Software Foundation, *
* Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA. *
* *
***************************************************************************
Author: Sérgio Marcelo S. Gomes <smace at smace.com.br>
Modified by Andrew Haines and Juha Manninen
Abstract: Invert Assignment Code.
Example: AValue := BValue -> BValue := AValue;
AValue := True -> AValue := False;
}
unit InvertAssignTool;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
function InvertAssignment(InText: string): string;
implementation
function GetIndent(ALine: String):Integer;
begin
Result := Length(Aline) - Length(TrimLeft(ALine));
end;
procedure DivideLines(Lines: TStrings; var PreList, AList, BList, PostList: TStrings);
var
ALine, TrueFalse: String;
t, f: Boolean;
X, I, EqPos, SemiPos, WordEndPos, BracketCount: Integer;
begin
for X := 0 to Lines.Count-1 do begin
ALine := Trim(Lines[X]);
EqPos := Pos(':=', ALine);
if EqPos > 0 then begin
SemiPos := Pos(';', ALine);
if SemiPos = 0 then
SemiPos:=Length(ALine)+1;
I := EqPos-1;
while (I > 0) and (ALine[I] = ' ') do // Skip initial spaces
Dec(I);
WordEndPos := I+1;
BracketCount := 0;
// Get the word before :=
while I > 0 do begin
if ALine[I] = ']' then
Inc(BracketCount)
else if ALine[I] = '[' then
Dec(BracketCount);
if (BracketCount = 0) and (ALine[I] = ' ') then
Break;
Dec(I);
end;
// I points now at beginning of word - 1
Alist.Add(Copy(ALine, I+1, WordEndPos-(I+1)));
BList.Add(Trim(Copy(ALine, EqPos+2, SemiPos-EqPos-2)));
PreList.Add(Trim(Copy(ALine,1, I)));
PostList.Add(Trim(Copy(ALine, SemiPos, Length(ALine)-(SemiPos-1))));
if Length(PreList[X]) > 0 then
PreList[X] := PreList[X] + ' ';
end
else begin // not a valid line
PreList.Add('');
AList.Add(ALine);
Blist.Add('');
PostList.Add('');
end;
// Check if is being assigned true or false
t := CompareText(BList[X], 'True') = 0;
f := CompareText(BList[X], 'False') = 0;
if t or f then begin
TrueFalse := AList[X];
AList[X] := BoolToStr(not t, 'True', 'False');
BList[X] := TrueFalse;
end;
end;
end;
function InvertLine(PreVar, VarA, VarB, PostVar: String; LineStart, EqualPosition: Integer): String;
var
fLength: Integer;
X: Integer;
begin
Result := '';
for X := 1 to LineStart do
Result := Result + ' ';
if Length(Trim(VarB)) = 0 then // is not a line with a ':='
Result := Result + VarA
else begin
Result := Result + PreVar + VarB;
fLength := Length(Trim(Result));
if fLength < EqualPosition then
for X := fLength+1 to EqualPosition do
Result := Result + ' ';
Result := Result + ' := ' + VarA + PostVar;
end;
end;
function IsAWholeLine(ALine: String): Boolean;
begin
// This function is useful for when the text is put back
// in the synedit, things like this don't happen:
// begin
// if CallSomeFunction > 0
// then
// DoThis
// else
// Exit;
// end;
//
// Would otherwise become this
//
// begin if CallSomeFunction > 0 then DoThis else exit;
// end;
Result := False;
ALine := LowerCase(ALine);
if (Pos(';', ALine) > 0)
or (Pos('if ', ALine) > 0)
or (Pos('begin', ALine) > 0)
or (Pos('end', ALine) > 0)
or (Pos('then', ALine) > 0)
or (Pos('else', ALine) > 0)
or (Pos('and', ALine) > 0)
or (Pos('or', ALine) > 0)
or (Pos('//', ALine) > 0)
then Result := True;
end;
// This function inverts all Assignments operation.
// like valuea := valueb; to valueb := valuea;
// or valuea := False; to valuea := True;
function InvertAssignment(InText: string): string;
var
InLines, TempLines: TStringList;
PreList, AList, BList, PostList: TStrings;
ALine: String;
Indents: array of integer;
X, Y, EqPos: Integer;
HasLinefeed: Boolean;
begin
if InText = '' then
Exit('');
HasLinefeed := InText[Length(InText)] in [#10,#13];
InLines := TStringList.Create;
InLines.Text := InText;
SetLength(Indents, InLines.Count);
TempLines := TStringList.Create;
// Join many lines to one
ALine := '';
for X := 0 to InLines.Count-1 do begin
ALine := ALine + InLines[X];
if IsAWholeLine(ALine) then begin
Indents[TempLines.Add(ALine)] := GetIndent(ALine);
ALine := '';
end;
end;
if Length(ALine) > 0 then
Indents[TempLines.Add(ALine)] := GetIndent(ALine);
InLines.Clear;
PreList := TStringList.Create;
AList := TStringList.Create;
BList := TStringList.Create;
PostList := TStringList.Create;
DivideLines(TempLines, PreList, AList, BList, PostList);
TempLines.Free;
// Find where the ':=' should be
EqPos := 0;
for X := 0 to BList.Count-1 do begin
Y := Length(BList[X]);
if Y > EqPos then
EqPos := Y;
end;
for X := 0 to AList.Count-1 do
InLines.Add(InvertLine(PreList[X],Alist[X],BList[X],PostList[X],Indents[X],EqPos));
PreList.Free;
AList.Free;
BList.Free;
PostList.Free;
Result := InLines.Text;
InLines.Free;
if not HasLinefeed then begin
while Result[Length(Result)] in [#10,#13] do
SetLength(Result, Length(Result)-1);
end;
end;
end.
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