Same commands for different unicodes?

[Thibaut Cuvelier]

On Sun, 20 Feb 2022 at 17:39, Kornel Benko <kornel at lyx.org> wrote:

> Am Sun, 20 Feb 2022 17:04:54 +0100
> schrieb Thibaut Cuvelier <tcuvelier at lyx.org>:
>
> > On Sun, 20 Feb 2022 at 13:12, Kornel Benko <kornel at lyx.org> wrote:
> >
> > > In unicodesymbols we find
> > >
> > > 0x025b "\\textepsilon"            "tipa" ...
> > > 0x03b5 "\\textepsilon"      "textgreek" ...
> > >
> >
> > 0x03b5 is a true epsilon (
> https://unicodemap.org/details/0x03B5/index.html),
> > i.e. a letter in the Greek alphabet, while 0x025b is only something that
> > looks like an epsilon (https://unicodemap.org/details/0x025b/index.html
> ),
> > an IPA symbol. For the latter (0x025b), it's rather an "open-mid front
> > unrounded vowel" (according to
> > https://upload.wikimedia.org/wikipedia/commons/8/8f/IPA_chart_2020.svg).
> > Although the TIPA package is using \textepsilon to enter this character (
> > https://mirror.lyrahosting.com/CTAN/fonts/tipa/tipaman.pdf, page 33), so
> > I'm not sure there's anything to correct.
> >
> >
> > > 0x204e "\\textasteriskcentered"   "textcomp" ...
> > > 0x*2217* "\\textasteriskcentered"   "textcomp" ...
> > >
> >
> > According to Wikipedia (https://en.wikipedia.org/wiki/Asterisk), 0x204e
> is
> > a "low asterisk" and 0x2217 is the "asterisk operator". It looks like
> > \textasteriskcentered should output a 0x2217 (based my understanding of
> > http://hevea.inria.fr/examples/test/sym.html) and \textasterisklow a
> 0x204e
> > (https://www.johndcook.com/unicode_latex.html: it's recognised by MathGL
> > http://mathgl.sourceforge.net/docs_v1/mathgl_en_10.html and STIX
> > http://www.ams.org/STIX/bnb/stix-tbl-2006-10-18.asc). I'd say this is a
> > mistake in unicodesymbols.
> >
> > For the math mode, these two symbols are found as \ast, I have no idea
> > about the semantic difference with the character * (0x002a): probably
> more
> > the operator, because it's usually used as times for calculators…
>
> My problem is more how to handle such cases (there are 44 conflicts in
> unicodesymbols).
>
> Say, we search for '⁎' (== 0x204e),
> lyx outputs \textasteriskcentered
> and lyxfind.cpp uses '∗' (== 0x2217)
>
> This means, we cannot find this char.
>
> I am not interested in the meaning of these unicode chars. The problem for
> findadv is that
> there are latex commands which create different unicode depending on moon
> phase.
>

Based on my understanding of this issue, there will always be some
discrepancy, as the mapping depends on the context (text, math, or TIPA,
mostly, as I could see). I believe it's hard to mistake the math mapping
with the two others, but I don't see a similar way to tell TIPA characters
from the others, as it looks like they are entered like normal letters
(i.e. not separated like the math mode): it's sure the TIPA mapping is the
best one within an IPA inset, but what about outside? I don't know
phonetics enough (especially typesetting with LyX) :/.

Would you have a script that finds all these occurrences or a list? Maybe
quite a few could be resolved like the asterisk.
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