restemplate/UFilter.pas

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{
This file is part of restemplate.
Copyright (C) 2015 Andreas Schneider
restemplate 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 3 of the License, or
(at your option) any later version.
restemplate 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.
You should have received a copy of the GNU General Public License
along with restemplate. If not, see <http://www.gnu.org/licenses/>.
}
unit UFilter;
{$mode objfpc}{$H+}
{$modeswitch advancedrecords}
interface
uses
Classes, SysUtils, RegExpr, fgl;
type
{ THighlightFilter }
THighlightFilter = class
Expression: TRegExpr;
FGColor: Byte;
BGColor: Byte;
constructor Create(AString: String);
destructor Destroy; override;
class var
FilterExpression: TRegExpr;
ParamExpression: TRegExpr;
end;
TFilterList = specialize TFPGObjectList<THighlightFilter>;
{ THighlight }
THighlight = record
FGColor: Byte;
BGColor: Byte;
Start: Integer;
Length: Integer;
class operator =(A, B: THighlight): Boolean;
end;
THighlights = specialize TFPGList<THighlight>;
function CompareHighlights(const AHL1: THighlight; const AHL2: THighlight): Integer;
implementation
{ THighlightFilter }
constructor THighlightFilter.Create(AString: String);
begin
FGColor := $FF;
BGColor := $FF;
if FilterExpression.Exec(AString) then
begin
Expression := TRegExpr.Create(Copy(AString, 1, FilterExpression.MatchPos[0] - 1));
if ParamExpression.Exec(FilterExpression.Match[0]) then
repeat
if ParamExpression.Match[1] = 'FG' then
FGColor := StrToInt(ParamExpression.Match[2])
else if ParamExpression.Match[1] = 'BG' then
BGColor := StrToInt(ParamExpression.Match[2]);
until not ParamExpression.ExecNext;
end else
Expression := TRegExpr.Create(AString);
end;
destructor THighlightFilter.Destroy;
begin
Expression.Free;
inherited Destroy;
end;
{ THighlight }
class operator THighlight. = (A, B: THighlight): Boolean;
begin
Result := (A.Start = B.Start) and (A.Length = B.Length);
end;
function CompareHighlights(const AHL1: THighlight; const AHL2: THighlight): Integer;
begin
if AHL1.Start = AHL2.Start then
begin
Result := AHL1.Length - AHL2.Length;
end else
Result := AHL1.Start - AHL2.Start;
end;
initialization
THighlightFilter.FilterExpression := TRegExpr.Create('( (FG|BG)(\d+))*$');
THighlightFilter.ParamExpression := TRegExpr.Create('(FG|BG)(\d+)');
finalization
THighlightFilter.FilterExpression.Free;
THighlightFilter.ParamExpression.Free;
end.