-s = !ws Grammar !ws
+s = ws! Grammar ws!
Grammar = NonTerminal +/ ws
// use 'a'-'z' or 'a-z' instead of [a-z]?
// EOF token?
// #include (with renaming?)
-// ANTLR uses ! and ^ suffixes
-RHS = (Sequence +/ (!ws "|" !ws)) +/ (!ws ">" !ws)
+RHS = (Sequence +/ (ws! "|" ws!)) +/ (ws! ">" ws!)
Elements = e*/ws
-PreSequence = ps:: Elements
- | (Quoted|Word) ^"::" PreSequence /ws
- > PreSequence ^"/" e /ws
- | PreSequence ^"->" e /ws
+PreSequence = Elements
+ | (Quoted|Word) ^"::" PreSequence /ws
+ > PreSequence ^"/" e /ws
+ | PreSequence ^"->" e /ws
Sequence = psx:: PreSequence
| Sequence ^"&" Elements /ws
Range = ec
| ec ^"-" ec
-NonTerminalReference = Word
-
e = (Quoted|Word) ^":" e
> NonTerminalReference
- | literal:: Quoted
+ | Literal
| ^"()"
| ^"{" PreSequence "}" /ws
| ^"[" Range* "]"
| e ^"*" /ws -> ~[*]
| e ^"**/" e /ws
| e ^"*/" e /ws
- | ^"!" e /ws
+ | e ^"!"
| e ^"?" /ws
| ^"^" Quoted
- | "(" Word ^")" /ws
> ^"(" RHS ")" /ws
| ^"~" e
- > "^^":: "^" e
-Word = [a-zA-Z0-9_]++
-Quoted = "\"" ((~[\"\\] | escaped)+) "\""
- | "":: "\"\""
+NonTerminalReference = Word
+Literal = Quoted
+Word = [a-zA-Z0-9_]++
+Quoted = "\"" ((~[\"\\] | escaped)+) "\""
+ | EmptyString
+EmptyString = "\"\""
+
escaped = "\n":: "\\n"
| "\r":: "\\r"
| "\\" ~[nr]