Testing syntax parsing in editors (especially emacs)

LanX has asked for the wisdom of the Perl Monks concerning the following question:

I'm looking for a way to use Perl to test syntax parsing of Perl code in various editors.

Regarding emacs:

it should be possible to run an emacs-versions in batch mode (aka headless) to load a Perl snippet and execute various elisp snippets.

It's also possible - at least in cperl-mode - to export a ~~html~~ postscript version of the Perl code.°

Another, way would be to use describe-text-properties at a text position to learn the current syntax:

e.g. my %hash

will show on my

Text content at position 1:


There are text properties here:
  face                 font-lock-keyword-face
  fontified            t
[download]

and on %hash

Text content at position 4:


There are text properties here:
  face                 cperl-hash-face
  fontified            t
[download]

"face" is emacs equivalent for "style" in HTML

any ideas?

Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery}

°) sorry I think I confused that with perltidy which offers html.

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Re: Testing syntax parsing in editors (especially emacs) by choroba (Cardinal) on Mar 15, 2021 at 18:16 UTC
This is what I usually use to htmlize text the Emacs way:htmlize.sh. It uses the Htmlize package. I don't use headless Emacs, as without the "head", the colours are different, and I haven't found a way how to enable them (but I haven't tried hard). `map{substr$_->[0],$_->[1]\|\|0,1}[\\|\|{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^ARGV,3]`	[reply] [d/l]
Re^2: Testing syntax parsing in editors (especially emacs) by LanX (Saint) on Mar 15, 2021 at 19:07 UTC
Thanks, a very similar approach, but your htmlize.el seems to be an external package, htmlfontify seems to be core. Still a hack but does the job so far. :) Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply]
Re: Testing syntax parsing in editors (especially emacs) by LanX (Saint) on Mar 15, 2021 at 19:00 UTC
my solution so far for emacs on linux `$ $ rm $file.html; emacs -Q -batch $file -f cperl-mode -f htmlfontify- +buffer -f save-buffer 2>$file.err; grep y_max $file.html <span class="keyword">sub</span> <span class="function-name">y_max</sp +an> {` [download] the `-Q` is not necessary, it's just speeding up startup by not loading any ini-files the `rm $file.html` was necessary, otherwise the html isn't saved. the grep is a cheap workaround for parsing the html. Please note that the names of the CSS-classes are not 1-to-1 to emacs faces for Perl, but the included attributes - like colors - are. As a generic option also for other editors (if they allow remote execution) It's also possible to trigger a PS or PDF save ... A `pdftohtml -xml` generates again a a similar `<xml>` output which can be parsed for correctness. Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery}	[reply] [d/l] [select]