+// use 'a'-'z' or 'a-z' instead of [a-z]?
+// EOF token?
+// #include (with renaming?)
+
s = ws! Grammar ws!
-Grammar = NonTerminal +/ ws
+Grammar = Declaration +/ ws
-NonTerminal = Word "=" RHS /ws
+Declaration = NonTerminal
+ | ^"#import" ws! FileName (ws! "as" ws! Word)?
-// use 'a'-'z' or 'a-z' instead of [a-z]?
-// EOF token?
-// #include (with renaming?)
-
+FileName = FileNameChar+ -> [\r\n ]
+FileNameChar = Space:: "\\ "
+ | ~[\r\n ]
+
+NonTerminal = Word "=" RHS /ws
+ | Word "*" ws! ^"=" ws! RHS
+ | Word "*/" Word ws! ^"=" ws! RHS
+
RHS = (Sequence +/ (ws! "|" ws!)) +/ (ws! ">" ws!)
Elements = e*/ws
-PreSequence = PS
+PreSequence = Elements
| (Quoted|Word) ^"::" PreSequence /ws
> PreSequence ^"/" e /ws
| PreSequence ^"->" e /ws
-PS = Elements
Sequence = psx:: PreSequence
- | Sequence ^"&" PS /ws
- | Sequence ^"&~" PS /ws
+ | Sequence ^"&" Elements /ws
+ | Sequence ^"&~" Elements /ws
ec = ~[\-\]\\]
| escaped
Range = ec
- | ec ^"-" ec
+ | ec "-" ec
e = (Quoted|Word) ^":" e
> NonTerminalReference
NonTerminalReference = Word
Literal = Quoted
-Word = [a-zA-Z0-9_]++
+Word = [.a-zA-Z0-9_]++
Quoted = "\"" ((~[\"\\] | escaped)+) "\""
- | "":: "\"\""
+ | EmptyString
+ EmptyString = "\"\""
escaped = "\n":: "\\n"
| "\r":: "\\r"