1 s ::= ws grammar ws => "gram"
3 grammar ::= r +/ ws => "grammar"
5 r ::= word ^"::=" alternatives /ws
6 | word ^"!::=" alternatives /ws
8 alternatives ::= (conjuncts +/ (ws "|" ws)) +/ (ws ">" ws)
10 conjuncts ::= sequence
11 | sequence ^"&" e*/ws /ws
12 | sequence ^"&~" e*/ws /ws
15 | (e+/ws ws)? "^" quoted (ws e+/ws)? => "ps2"
19 | psx ^"=>" (word|quoted) /ws
24 range ::= ec => "range"
27 e ::= word => "nonTerminal"
30 | ^"{" sequence "}" /ws
34 | (e ws ^"**" > e ws ^"*")
36 | (e ws ^"++" > e ws ^"+")
41 > ^"(" alternatives ")" /ws
46 word ::= [a-zA-Z0-9_]++
47 quoted ::= "\"" (([~\"\\] | escaped)+) "\""
49 escaped ::= "\\n" => "\n"