Re: Emacs i18n

[Juri Linkov]

>> Is it possible to generate a regexp from ngettext arguments?
>> For example, given the same arguments and calling a hypothetical
>> function ‘rx-ngettext’:
>>
>>  (rx-ngettext "finished with %d match found\n"
>>               "finished with %d matches found\n")
>>
>> to generate a regexp like:
>>
>>  "finished with \\(?:\\(\\(?:[0-9]+ \\)?match\\(?:es\\)? found\\)"
>
> Trivially so by generating an or-pattern: "singular text\\|plural text".
> Anything better is a matter of optimisation, basically a diff algorithm
> (or just prefix and suffix merging).
>
> Is it practical, though? For %s, we would need to generate a match-anything
> subexpression, even though the argument is much more constrained in practice.

I tried ‘regexp-opt’ and it generates a ready-to-use regexp:

  (replace-regexp-in-string
   "%d" "\\\\([0-9]+\\\\)"
   (regexp-opt '("finished with %d match found"
                 "finished with %d matches found"
                 "finished with no matches found")))

  ⇒ "\\(?:finished with \\(?:\\(?:\\([0-9]+\\) match\\(?:es\\)?\\|no matches\\) 
found\\)\\)"