s ::= ws grammar ws => "gram"
ws !::= w**
-grammar ::= r+/ws => "grammar"
+grammar ::= r $$ ws => "grammar"
r ::= word ^"::=" alternatives /ws
| word ^"!::=" alternatives /ws
-ec ::= [~\]\\\-\~] | escaped
+alternatives ::= equiAlt $$ (ws ">" ws)
+equiAlt ::= conjuncts $$ (ws "|" ws) => "alternatives"
-alternatives ::= equiAlt +/ (ws ">" ws)
-equiAlt ::= conjuncts +/ (ws "|" ws) => "alternatives"
+sequence ::= es
+ > es ws ^"/" e
+es ::= e %% (w**)
-sequence ::= Es
- > Es ^"/" e /ws
-Es ::= e+
-es ::= e+/ws
+ss ::= es | es ^"/" e /ws
conjuncts ::= rewrite
- | rewrite ^"&" sequence /ws
- | rewrite ^"&~" sequence /ws
+ | rewrite ^"&" e%%ws /ws
+ | rewrite ^"&~" e%%ws /ws
rewrite ::= sequence /ws => "rewrite"
| sequence ^"=>" word /ws
| sequence ^"=>" quoted /ws
| sequence "=>" "()" /ws => "wrap"
+ec ::= [~\-\]\\\~]
+ | escaped
+
range ::= ec => "range0"
- | ec ^"-" ec => "range0"
+ | ec ^"-" ec => "range1"
e ::= word => "nonTerminalY"
| [(][)] => "epsilon"
| ^"{" alternatives "}" /ws
- | "[" [\~]? range* "]" => "range"
- | e ^"*/" e /ws
+ | "[" (range*) "]" => "range"
+ | "[~" (range*) "]" => "rangex"
+ | e ^"%%" e /ws
+ | e ^"$$" e /ws
| e ^"+/" e /ws
+ | e ^"*/" e /ws
| e ^"?" /ws
| e ^"~/~" /ws
> ^"(" alternatives ")" /ws
w !::= " "
- | "//" [~\n]* "\n"
+ | "//" ([~\n]*) "\n"
| "\n"
| "\r"
an ::= [a-zA-Z0-9_]
word ::= an++ => "sify"
-quoted ::= "\"" ([~\"\\] | escaped)* "\"" => "sify"
+quoted ::= "\"" (([~\"\\] | escaped)*) "\"" => "sify"
escaped ::= "\\n" => "\n"
| "\\r" => "\r"
| "\\" [~nr]