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Message-ID: <20140727172308.GH10402@port70.net>
Date: Sun, 27 Jul 2014 19:23:09 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: Non-stub gettext API functions committed, ready for
testing
* Rich Felker <dalias@...c.org> [2014-07-27 12:49:21 -0400]:
> On Sun, Jul 27, 2014 at 04:14:18PM +0200, Szabolcs Nagy wrote:
> > it shows that a c arithmetic expression parser is needed to handle plurals
> > (and the expression has to be evaluated every time dcngettext is invoked)
>
> Not necessarily. You could cache results. Or (this is likely the more
> reasonable implementation) just hard-code the expression strings that
> are actually used for real languages and implement them in C when a
> match is found.
>
hardcoding the strings will fail if .mo files are updated to
use different expressions
with caching the expr has to be evaluated for every uncached n
> > Plural-Forms: nplurals=2; plural=n == 1 ? 0 : 1;
> >
> > The nplurals value must be a decimal number which specifies how many
> > different plural forms exist for this language. The string following
> > plural is an expression which is using the C language syntax.
> > Exceptions are that no negative numbers are allowed, numbers must be
> > decimal, and the only variable allowed is n.
>
> This is a very poor description. Does it allow casts? Compound
> literals? Floating point? Function calls? ...?
>
the parser in gnu gettext:
http://git.savannah.gnu.org/cgit/gettext.git/tree/gettext-runtime/intl/plural.y
so they implement
conditional (?:)
logic (&&, ||, !)
relational (==, !=, <, >, <=, >=)
and arithmetic (+, -, *, /, %)
operators with unsigned long args only
but in practice the only arithmetic operator used is %
and operators are not combined arbitrarily
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