Re: latexenc-find-file-coding-system is slow.

[Lute Kamstra <Lute.Kamstra.lists@xs4all.nl>]

Arne Jørgensen <arne@arnested.dk> writes:

> Stefan Monnier <monnier@iro.umontreal.ca> writes:

[...]

>> - use (re-search-forward "\\\\usepackage\\[\\(.*\\)\\]{inputenc}")
>>   and once it matched, check if it's inside a comment.  This should be
>>   *much* faster because of how the regexp-engine works (basically,
>>   it will backtrack much less).  The search as it is coded now could very
>>   well fail with "regexp stack overflow".

[...]

> Lute Kamstra <Lute.Kamstra.lists@xs4all.nl> writes:

[...]

>> Another idea is to change the regexps and search only for
>> \inputencoding{...} and \usepackage[...]{inputenc} at the start of a
>> line.  That's where they typically are.  This will speed up the search
>> dramatically.
>
> That would probably be an ok compromise (between what is actually
> legal LaTeX and what is normally used). But the other approaches can
> do the trick I would prefer to avoid this.

You can avoid it by using Stefan's suggestion above.  It is probably
faster than my idea, but a bit more work to implement.

Lute.