s ::= ws grammar ws => "gram"
ws !::= w**
-grammar ::= r $$ ws => "grammar"
+grammar ::= r +/ ws => "grammar"
r ::= word ^"::=" alternatives /ws
| word ^"!::=" alternatives /ws
-alternatives ::= equiAlt $$ (ws ">" ws)
-equiAlt ::= conjuncts $$ (ws "|" ws) => "alternatives"
+alternatives ::= (conjuncts +/ (ws "|" ws)) +/ (ws ">" ws)
-sequence ::= Es
- > Es ws ^"/" e
-Es ::= e+
-es ::= e %% ws
+conjuncts ::= sequence
+ | sequence ^"&" e*/ws /ws
+ | sequence ^"&~" e*/ws /ws
-ss ::= es | es ^"/" e /ws
-
-conjuncts ::= rewrite
- | rewrite ^"&" e%%ws /ws
- | rewrite ^"&~" e%%ws /ws
-
-rewrite ::= sequence /ws => "rewrite"
- | sequence ^"=>" word /ws
- | sequence ^"=>" quoted /ws
- | sequence "=>" "()" /ws => "wrap"
+ps ::= e*/ws => "ps"
+psx ::= ps
+ > ps ^"/" e /ws
+sequence ::= psx
+ | psx ^"=>" (word|quoted) /ws
ec ::= [~\-\]\\\~]
| escaped
-range ::= ec => "range0"
- | ec ^"-" ec => "range1"
-
-e ::= word => "nonTerminalY"
- | [(][)] => "epsilon"
- | ^"{" alternatives "}" /ws
- | "[" ranges "]" => "range"
- | "[~" ranges "]" => "rangex"
- | e ^"%%" e /ws
- | e ^"$$" e /ws
- | e ^"?" /ws
- | e ^"~/~" /ws
+range ::= ec => "range"
+ | ec ^"-" ec
- | e ^"-" e /ws
-
- | ^"!" e /ws
- | "^" quoted /ws => "care"
- | ^"`" e /ws
- | e ^"#" /ws
+e ::= word => "nonTerminal"
| quoted => "literal"
+ | ^"()"
+ | ^"{" sequence "}" /ws
+ | ^"[" (range*) "]"
+ | ^"[~" (range*) "]"
+ | ^"^" quoted /ws
+// | ^"!" e /ws
| (e ws ^"**" > e ws ^"*")
+ | e ^"*/" e /ws
| (e ws ^"++" > e ws ^"+")
+ | e ^"+/" e /ws
+ | e ^"?" /ws
- | "(" word ^")" /ws
- > ^"(" alternatives ")" /ws
-
-ranges ::= range*
+ | "(" 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]