tests/meta.g

   1 s         ::=  w* Grammar w*                  => "gram"
   2 ws       !::=  w*
   3 grammar   ::=  R+/ws => "grammar"
   4 Grammar   ::=  R+ => "grammar"
   5 R         ::=  word  ^"::=" Alternatives
   6             |  word ^"!::=" Alternatives
   7
   8 ec        ::=  [~\]\\\-\~] | escaped
   9
  10 Alternatives  ::=  EquiAlt   +/ ">"
  11 EquiAlt       ::=  Conjuncts +/ "|"                 => "alternatives"
  12
  13 Sequence    ::= E+ ^"/" E
  14               > E+
  15
  16 Conjuncts   ::=  rewrite
  17               |  rewrite ^"&"  Sequence
  18               |  rewrite ^"&~" Sequence
  19
  20 rewrite  ::=  Sequence                  /ws        => "rewrite"
  21            |  Sequence ^"=>" word       /ws
  22            |  Sequence ^"=>" quoted     /ws
  23            |  Sequence  "=>" "()"       /ws        => "wrap"
  24
  25 range    ::= ec => "range0" | ec ^"-" ec      => "range0"
  26 E        ::= word                             => "nonTerminalY"
  27            |    [(][)] => "epsilon"
  28            |    ^"{" Alternatives "}"
  29            |     "[" [\~]?  range* "]"        => "range"
  30            |  E ^"*/" E
  31            |  E ^"+/" E
  32            |  E ^"?"
  33            |  E ^"~/~"
  34
  35            |  E ^"-"  E
  36
  37            |    ^"!" E
  38            |     "^" quoted => "care"
  39            |    ^"`" E
  40            |  E ^"#"
  41            |  quoted                        => "literal"
  42
  43            |  (E ^"**" > E ^"*")
  44            |  (E ^"++" > E ^"+")
  45
  46            |     "(" word ^")"
  47            >    ^"(" Alternatives ")"
  48
  49 w       !::= " "
  50            | "//" [~\n]* "\n"
  51            | "\n"
  52            | "\r"
  53 an       ::= [a-zA-Z0-9_]
  54 word     ::= an++                           => "sify"
  55 quoted   ::= "\"" ([~\"\\] | escaped)* "\"" => "sify"
  56 escaped  ::= "\\n" => "\n"
  57            | "\\r" => "\r"
  58            | "\\" [~nr]