Still working on LexAHK.cxx, doing a major refactoring...
In AutoHotkey language, there is no reserved words, so even as Send or
MsgBox are official commands, you can use these names as variable names.
Ie. I can write Send = Foo or MsgBox = String
When lexing, I first see them as identifiers then as commands (classical
method). But upon seeing a = or a :=, I must change their state back to
identifier. I have some other similar cases, like label handling.
I thought of making a bookmark class, which would record the start and
end position of the word that can change, then change its state if I
meet a modifier:
void ChangeState(int state) {
styler.StartSegment(markedPosStart);
styler.ColourTo(markedPosEnd, state);
}
I was hoping it wouldn't alter the StyleContext, which would be able to
continue.
Alas, it doesn't work, because DocumentAccessor::ColourTo not only use
the positions, but also a validLen counter, pointing in the style
buffer, and this one doesn't go back upon a call to StartSegment...
So I end by triggering the
PLATFORM_ASSERT((startPosStyling + validLen) < Length());
My question is: what is the best way to handle this?
I saw LexPerl, but it is really doing backtracking, ie., if I understood
correctly, it goes back in the source using it finds the start of the
HereDoc or other multi-line constructs, memorize the ending string, then
it starts lexing from this point. Same for other lexers like the Fortran
one (and languages with this HereDoc feature: Bash, Ruby, PHP...).
So, is there already some clean way to change the style of an arbitrary
text segment? If no, is there a clean way to implement it in
DocumentAccessor? Or do I have to mess at lower level?
--
Philippe Lhoste
-- (near) Paris -- France
-- http://Phi.Lho.free.fr
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