tests/meta.g

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