1 s ::= Grammar ws => "gram"
2 Grammar ::= NonTerminal +/ ws => "grammar"
3 NonTerminal ::= word ^"::=" RHS /ws
5 w ::= " " | "\n" | "\r"
7 | w** "//" (~[\n]*) "\n" ws => ()
10 RHS ::= (Conjuncts +/ (!ws "|" !ws)) +/ (!ws ">" !ws)
12 Conjuncts ::= Sequence
13 | Sequence ^"&" e*/ws /ws
14 | Sequence ^"&~" e*/ws /ws
17 | (e+/ws !ws)? ^"^" Quoted (!ws e+/ws)?
22 Sequence ::= Quoted => "qprod"
25 | psx ^"=>" ("()"|word|Quoted) /ws
30 Range ::= ec => "range"
33 e ::= word => "nonTerminal"
36 | ^"{" Sequence "}" /ws
39 | (e ^"++" /ws > e ^"+" /ws)
40 | (e ^"++/" e /ws > e ^"+/" e /ws)
41 | (e ^"**" /ws > e ^"*" /ws)
42 | (e ^"**/" e /ws > e ^"*/" e /ws)
50 word ::= [a-zA-Z0-9_]++
51 Quoted ::= "\"" ((~[\"\\] | escaped)+) "\""
53 escaped ::= "\\n" => "\n"