Re: Inline LaTeX formulae

[Titus von der Malsburg <malsburg@posteo.de>]

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On 2015-05-06 Wed 03:24, Rasmus wrote:
> Hi Titus,
>
> Titus von der Malsburg <malsburg@posteo.de> writes:
>
>> Parentheses are punctuation, so the $ in my example should be
>> interpreted as math delimiters.  I think whoever wrote the code, simply
>> overlooked parentheses when implementing the punctuation part.
>
> I believe the problem is complicated.

I had a look at the code in org-element.el (thanks for the
pointer).  There is clearly a bigger problem here: There is a
regexp listing all characters that must follow the final $ to make it
qualify as a math delimiter (whitespace, punctuation).  As I suspected,
the parentheses are missing from that list (and adding them solves my
problem).  However, a metric ton of other punctuation marks are missing
as well, Spanish question marks, curly/smart quotes, real dashes (a
minus is not a dash!), …, even the exclamation mark is missing.

If syntax tables allow a proper solution, great.  I understand that
syntax tables have a different meaning in different modes but does that
matter?  We’re only concerned about org-mode, right?  Are there
scenarios where the org parser is used in a non-org-mode buffer?

I also saw that the commit that introduced the problem had the following
description:

  Avoid using slow regexp.

So if the problem is only due to mistaken optimization, it would perhaps
be best to just revert to the previous code.

  Titus

> In principal you could change the regexp in
> org-element-latex-fragment-parser to something like
>
>    "\\(\\s.\\|\\s-\\|\\s)\\|\\s\"\\|\\s_\\)"
>
> You'd only be relying on syntax tables, which I believe is what you are
> suggesting.  But this is also dangerous, see e.g. the recent change of
> org-string-nw-p which previously relied on "\\S" cf.:
>
>       http://article.gmane.org/gmane.emacs.orgmode/95473
>
>> This should be fixed.
>
> Patches welcome.  You could try to submit a patch where you add closing
> parenthesis characters.
>
> It could even be patches to org.texi!
>
> Thanks,
> Rasmus


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