Well, the syntax is:
condition = and_condition ('or' and_condition)*
and_condition = relation ('and' relation)*
relation = is_relation | in_relation | within_relation | 'n' <EOL>
is_relation = expr 'is' ('not')? value
in_relation = expr ('not')? 'in' range_list
within_relation = expr ('not')? 'within' range_list
expr = 'n' ('mod' value)?
range_list = (range | value) (',' range_list)*
value = digit+
digit = 0|1|2|3|4|5|6|7|8|9
range = value'..'value
Would this one work:
http://pear.php.net/package/PHP_ParserGenerator
?
Domas
On Jun 20, 2012, at 2:02 PM, Niklas Laxström wrote:
> No, this is not about a wikitext parser. Rather something much simpler.
>
> Have a look at [1] and you will see rules like:
> n in 0..1
> n is 2
> n mod 10 in 3..4,9 and n mod 100 not in 10..19,70..79,90..99
>
> Long ago when I wanted to compare the plural rules of MediaWiki and
> CLDR I wrote a parser for the CLDR rule format. Unfortunately my
> implementation uses regular expression and eval, which makes it
> unsuitable for production. Now, writing parsers is not my area of
> expertise, so can you please point me how to do this properly with
> PHP. Bonus points if it is also easily adaptable to JavaScript.
>
> [1]
> http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html
>
> -Niklas
>
> --
> Niklas Laxström
>
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