Re: UTF-8-aware backwards string searching in Guile, or: fixing centered lyrics ignoring punctuation

[Alexander Kobel]

Gosh,

once again I'm flabbergasted about the expertise and helpfulness of the 
folks on this list. Thanks a ton!

As far as I can tell, your corrected version works like a charm (and 
even fixed a minor misalignment of the "à" syllable that I did not spot 
earlier). And IIUC, the only drawback of the quick'n'dirty variant is 
that it does not actually do a canonicalization of the strings involved, 
so that two different representations of a glyph (e.g., using different 
combining characters) will not match. But this is extremely unlikely 
given that they should be usually entered by the same user in the same 
way, and that the set of characters to compare with is fairly limited 
and probably even has a unique encoding anyway.
So, problem solved for me.

I can only hope that you did not spend the 4.75 hours between your mails 
for the "quick fix"...


Cheers,
Alex


On 31/10/2018 05.23, Aaron Hill wrote:
> On 2018-10-30 4:56 pm, Aaron Hill wrote:
> > On 2018-10-30 10:01 am, Alexander Kobel wrote:
> > > Does anyone have a hint how to approach this one? (Or is the answer
> > > just: be patient and hope for Guile v2?)
> >
> > The only hint here is to replace the built-in functions with ones
> > which understand UTF8 encoding and can perform the work needed.  There
> > very well might be someone online who has already done this work,
> > which would save on having to do it yourself.
> >
> > Otherwise, the basic strategy is to replace string->list with a
> > version that decodes UTF8 and returns a list of integers (essentially
> > UTF32).  Then, all of the string work is being done with these lists
> > of integers instead.  (The character set would also just be a set of
> > integers representing the unique Unicode code points.)  After you find
> > the subsets of the list that are interesting to measure, you'll then
> > need to convert the list back into a string.  This means encoding back
> > into UTF8 and emitting a string.
>
> Here's a quick-n-dirty patch to address the issue.
>
> %%%%
> \version "2.19.82"
> \include "center-lyrics-ignoring-punctuation.ily"
> { d'4 4 4 }
> \addlyrics { Å Ɓ† «Ḉ…» }
> %%%%
>
> -- Aaron Hill
>
> _______________________________________________
> lilypond-user mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/lilypond-user

smime.p7s
Description: S/MIME Cryptographic Signature