1 s ::= ws grammar ws => "gram"
4 grammar ::= r +/ ws => "grammar"
6 r ::= word ^"::=" alternatives /ws
7 | word ^"!::=" alternatives /ws
9 alternatives ::= (conjuncts +/ (ws "|" ws)) +/ (ws ">" ws)
11 conjuncts ::= sequence
12 | sequence ^"&" e*/ws /ws
13 | sequence ^"&~" e*/ws /ws
16 | (e+/ws ws)? "^" quoted (ws e+/ws)? => "ps2"
20 | psx ^"=>" (word|quoted) /ws
25 range ::= ec => "range"
28 e ::= word => "nonTerminal"
31 | ^"{" sequence "}" /ws
35 | (e ws ^"**" > e ws ^"*")
37 | (e ws ^"++" > e ws ^"+")
42 > ^"(" alternatives ")" /ws
47 word ::= [a-zA-Z0-9_]++
48 quoted ::= "\"" (([~\"\\] | escaped)+) "\""
50 escaped ::= "\\n" => "\n"