1 s ::= !ws Grammar ws => "gram"
2 Grammar ::= NonTerminal +/ ws => "grammar"
3 NonTerminal ::= word ^"::=" RHS /ws
5 RHS ::= (Conjuncts +/ (!ws "|" !ws)) +/ (!ws ">" !ws)
8 | Sequence ^"&" Elements /ws
9 | Sequence ^"&~" Elements /ws
12 PreSequence ::= Elements => "ps"
13 | PreSequence !wp ^"/" !ws e
14 | PreSequence ^"->" e /ws
15 | (Quoted|word) ^"::" PreSequence /ws
16 | PreSequence ^"=>" ("[]"|"()"|word|Quoted) /ws
17 Sequence ::= PreSequence => "psx"
22 Range ::= ec => "range"
27 > word => "nonTerminal"
30 | ^"{" Sequence "}" /ws
48 word ::= [a-zA-Z0-9_]++
49 Quoted ::= "\"" ((~[\"\\] | escaped)+) "\""
51 escaped ::= "\\n" => "\n"
56 w ::= " " | "\n" | "\r"
58 | w** "//" ~[\n]* "\n" ws => ()