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Allow variable names on elements

db4
Chris Double 2008-03-31 14:03:16 +13:00
parent 55a69392fa
commit ee2194d1dc
1 changed files with 7 additions and 1 deletions
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8
extra/peg/ebnf/ebnf.factor
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@ -102,7 +102,7 @@ C: <ebnf> ebnf
"]" syntax , "]" syntax ,
] seq* [ first >string <ebnf-range> ] action ; ] seq* [ first >string <ebnf-range> ] action ;
: 'element' ( -- parser ) : ('element') ( -- parser )
#! An element of a rule. It can be a terminal or a #! An element of a rule. It can be a terminal or a
#! non-terminal but must not be followed by a "=". #! non-terminal but must not be followed by a "=".
#! The latter indicates that it is the beginning of a #! The latter indicates that it is the beginning of a
@ -120,6 +120,12 @@ C: <ebnf> ebnf
] choice* , ] choice* ,
] seq* [ first ] action ; ] seq* [ first ] action ;
: 'element' ( -- parser )
[
[ ('element') , ":" syntax , "a-zA-Z" range-pattern repeat1 [ >string ] action , ] seq* [ first2 <ebnf-var> ] action ,
('element') ,
] choice* ;
DEFER: 'choice' DEFER: 'choice'
: grouped ( quot suffix -- parser ) : grouped ( quot suffix -- parser )