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unit ATStringProc_HtmlColor;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Graphics;
//convert TColor -> HTML color string #rrggbb
function SColorToHtmlColor(Color: TColor): string;
//convert string which starts with HTML color token #rgb, #rrggbb -> TColor, get len of color-string
function SHtmlColorToColor(s: string; out Len: integer; Default: TColor): TColor;
implementation
function IsCharWord(ch: char): boolean;
begin
Result:= ch in ['a'..'z', 'A'..'Z', '_', '0'..'9'];
end;
function IsCharHex(ch: char): boolean;
begin
Result:= ch in ['0'..'9', 'a'..'f', 'A'..'F'];
end;
function SColorToHtmlColor(Color: TColor): string;
var
N: Longint;
begin
if Color=clNone then
begin Result:= ''; exit end;
N:= ColorToRGB(Color);
Result:= '#'+
IntToHex(Red(N), 2)+
IntToHex(Green(N), 2)+
IntToHex(Blue(N), 2);
end;
function SHtmlColorToColor(s: string; out Len: integer; Default: TColor): TColor;
var
N1, N2, N3: integer;
i: integer;
begin
Result:= Default;
Len:= 0;
if (s<>'') and (s[1]='#') then Delete(s, 1, 1);
if (s='') then exit;
//delete after first nonword char
i:= 1;
while (i<=Length(s)) and IsCharWord(s[i]) do Inc(i);
Delete(s, i, Maxint);
//allow only #rgb, #rrggbb
Len:= Length(s);
if (Len<>3) and (Len<>6) then exit;
for i:= 1 to Len do
if not IsCharHex(s[i]) then exit;
if Len=6 then
begin
N1:= StrToInt('$'+Copy(s, 1, 2));
N2:= StrToInt('$'+Copy(s, 3, 2));
N3:= StrToInt('$'+Copy(s, 5, 2));
end
else
begin
N1:= StrToInt('$'+s[1]+s[1]);
N2:= StrToInt('$'+s[2]+s[2]);
N3:= StrToInt('$'+s[3]+s[3]);
end;
Result:= RGBToColor(N1, N2, N3);
end;
end.
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