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