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"
-
-sequence ::= Es
- > Es ^"/" E /ws
-Es ::= E+
-//es ::= E+/ws
-
-conjuncts ::= rewrite
- | rewrite ^"&" sequence /ws
- | rewrite ^"&~" sequence /ws
-
-rewrite ::= sequence /ws => "rewrite"
- | sequence ^"=>" word /ws
- | sequence ^"=>" quoted /ws
- | sequence "=>" "()" /ws => "wrap"
-
-range ::= ec => "range0" | ec ^"-" ec => "range0"
-E ::= word => "nonTerminalY"
- | [(][)] => "epsilon"
- | ^"{" alternatives "}"
- | "[" [\~]? range* "]" => "range"
- | E ^"*/" E
- | E ^"+/" E
- | E ^"?"
- | E ^"~/~"
-
- | E ^"-" E
-
- | ^"!" E
- | "^" quoted => "care"
- | ^"`" E
- | E ^"#"
- | quoted => "literal"
+equiAlt ::= conjuncts +/ (ws "|" ws)
+
+conjuncts ::= sequence
+ | sequence ^"&" e*/ws /ws
+ | sequence ^"&~" e*/ws /ws
+
+sequence ::= e*/ws
+ (ws "/" e)?
+ (ws "=>" ws (word|quoted))? => "seq"
+
+ec ::= [~\-\]\\\~]
+ | escaped
+
+range ::= ec => "range"
+ | ec ^"-" ec
- | (E ^"**" > E ^"*")
- | (E ^"++" > E ^"+")
+e ::= word => "nonTerminal"
+ | [(][)] => "epsilon"
+ | ^"{" alternatives "}" /ws
+ | ^"[" (range*) "]"
+ | ^"[~" (range*) "]"
+ | ^"^" quoted /ws
+ | ^"!" e /ws
- | "(" word ^")"
- > ^"(" alternatives ")"
+ | (e ws ^"**" > e ws ^"*")
+ | e ^"*/" e /ws
+ | (e ws ^"++" > e ws ^"+")
+ | e ^"+/" e /ws
+ | e ^"?" /ws
+
+ | quoted => "literal"
+
+ | "(" word ^")" /ws
+ > ^"(" alternatives ")" /ws
w !::= " "
- | "//" [~\n]* "\n"
+ | "//" ([~\n]*) "\n"
| "\n"
| "\r"
-an ::= [a-zA-Z0-9_]
-word ::= an++ => "sify"
-quoted ::= "\"" ([~\"\\] | escaped)* "\"" => "sify"
+word ::= [a-zA-Z0-9_]++
+quoted ::= "\"" (([~\"\\] | escaped)+) "\""
+ | "\"\"" => ""
escaped ::= "\\n" => "\n"
| "\\r" => "\r"
| "\\" [~nr]
+
+