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The XML highlighter TWPXMLSyntax descends from TWPCustomSyntax.
It is used to highlight XML and HTML code. It uses a fixed pitch fonts.
It only overrides two methods:
constructor TWPXMLSyntax.Create(aOwner: TComponent);
begin
inherited Create(aOwner);
FReservedColor := clBlue;
end;
and NextChar which detects the meaning of certain parts of the text. The caller takes care that "FMode" is updated with the mode which was active when the previous paragraph ended.
procedure TWPXMLSyntax.NextChar(par: TParagraph; CPos: Integer);
var C: WideChar;
function CC(i: Integer): WideChar;
begin if (CPos + i < 0) or (CPos + i >= par.CharCount) then Result := #0 else Result := par.CharItem[CPos + i]; end;
begin
if FRTFProps <> nil then
begin
C := par.CharItem[CPos];
if not (FMode in [wpsynMLComment, wpsynComment, wpsynReserved, wpsynString]) then
begin
if (C = '&') then FMode := wpsynChar
else if (C = '<') then
begin
if (CC(1) = '!') and (CC(2) = '-') and (CC(3) = '-') then
FMode := wpsynMLComment
else FMode := wpsynReserved;
end;
if C = '>' then Ferror := true;
end
else
begin
if (FMode = wpsynReserved) and (c = #32) then FMode := wpsynString
else if (FMode = wpsynString) and (c = '>') then FMode := wpsynReserved;
if C = '<' then Ferror := true;
end;
inherited NextChar(par, CPos);
if (FMode = wpsynMLComment) and (C = '>') and (CC(-1) = '-') then
FMode := wpsynNormal
else if (FMode = wpsynReserved) and (C = '>') then
FMode := wpsynNormal
else if (FMode = wpsynChar) and ((C = ';') or (C = #32)) then
FMode := wpsynNormal;
Ferror := false;
end;
end;