reserve s reserves the word
s as if it was a keyword, although it will not be defined as one. The exception
Invalid_argument is raised if the word
s is already reserved.
check s calls
Earley.give_up () if
s is a reserved word. It can be used to reject keywords while parsing identifiers for example.
val create : string -> unit Earley.grammar
create s reserves the keyword
s and returns a parser accepting the string
s, not followed by a character of
S.id_charset. In the case where
s is already reserved,
Invalid_argument is raised.
val special : string -> unit Earley.grammar
special s accpets the same input as
create s, but the word
s is not reserved.