Christian Brabandt wrote:
> Bram,
> I recently discovered, that using equivalence classes in regular
> expressions did not match all expected characters. Also I think, the
> current implementation does not work as expected, since searching for
> [[=Ä=]] does only match Ä and neither A nor any other A like character.
>
> So I looked into the standard¹ and found that apparently not all
> characters are matched according to it.
I don't think the documentation says that it works according to any
standard. If we go this way, we need to make sure we are actually using
the right standard for this functionality.
> I wrote a testfile² that contains all character codes that need to match
> for /[[=A=]]. If you search for /[[=A=]]$ you'll see, that some
> characters are skipped.
>
> So I threw together a small vim script³, that parses the given standard
> file and generates a huge switch statement to be used in the function
> reg_equi_class() of the regexp.c in the Vim source.
>
> Using this generated code in regexp.c, I created this patch⁴, which
> successfully matches all expected characters from that testfile. It also
> adds equivalence classes for the 10 digits 0-9 (and added some missing
> equivalence classes, e.g. for 'Q')
>
> However, some characters are now missing from the equivalence classes,
> like most notably U01E4 U01E5 U0149 U0166 U0167 U01B5 U01B6 since they
> are defined to have different primary weight than their Ascii
> counterparts (G g n T t Z z), so I removed those chars from test44
Hmm, doesn't this indicate the standard is not right for this purpose?
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/// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net \\\
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