s ::= ws grammar ws => "gram"
ws !::= w**
+wp !::= w++
grammar ::= r +/ ws => "grammar"
+
r ::= word ^"::=" alternatives /ws
| word ^"!::=" alternatives /ws
alternatives ::= (conjuncts +/ (ws "|" ws)) +/ (ws ">" ws)
-conjuncts ::= sequence
- | sequence ^"&" e*/ws /ws
- | sequence ^"&~" e*/ws /ws
+conjuncts ::= sequence
+ | sequence ^"&" e*/ws /ws
+ | sequence ^"&~" e*/ws /ws
-ps ::= e*/ws => "ps"
+ps ::= e*/ws => "ps"
+ | (e+/ws ws)? "^" quoted (ws e+/ws)? => "ps2"
psx ::= ps
- > ps ^"/" e /ws
+ | ps wp ^"/" ws e
sequence ::= psx
| psx ^"=>" (word|quoted) /ws
| ^"{" sequence "}" /ws
| ^"[" range* "]"
| ^"[~" range* "]"
- | ^"^" quoted /ws
-// | ^"!" e /ws
| (e ws ^"**" > e ws ^"*")
| e ^"*/" e /ws
| "(" word ^")" /ws
> ^"(" alternatives ")" /ws
-
w !::= " "
| "//" ([~\n]*) "\n"
| "\n"