tests/meta.g

   1 s         ::=  ws grammar ws                  => "gram"
   2 ws       !::=  w**
   3 grammar   ::=  r $$ ws => "grammar"
   4 r         ::=  word  ^"::=" alternatives /ws
   5             |  word ^"!::=" alternatives /ws
   6
   7 alternatives  ::=  equiAlt   $$ (ws ">" ws)
   8 equiAlt       ::=  conjuncts $$ (ws "|" ws)          => "alternatives"
   9
  10 sequence    ::= es
  11               > es ws ^"/" e
  12 Es          ::= e %% (w**)
  13 es          ::= e %% (w**)
  14
  15 ss ::= es | es ^"/" e /ws
  16
  17 conjuncts   ::=  rewrite
  18               |  rewrite ^"&"  e%%ws   /ws
  19               |  rewrite ^"&~" e%%ws   /ws
  20
  21 rewrite  ::=  sequence                  /ws        => "rewrite"
  22            |  sequence ^"=>" word       /ws
  23            |  sequence ^"=>" quoted     /ws
  24            |  sequence  "=>" "()"       /ws        => "wrap"
  25
  26 ec       ::= [~\-\]\\\~]
  27            | escaped
  28
  29 range    ::= ec          => "range0"
  30            | ec ^"-" ec  => "range1"
  31
  32 e        ::= word                             => "nonTerminalY"
  33            |    [(][)] => "epsilon"
  34            |    ^"{" alternatives "}"   /ws
  35            |     "["  (range*) "]" => "range"
  36            |     "[~" (range*) "]" => "rangex"
  37            |  e ^"%%" e                 /ws
  38            |  e ^"$$" e                 /ws
  39            |  e ^"?"                    /ws
  40            |  e ^"~/~"                  /ws
  41
  42            |  e ^"-"  e                 /ws
  43
  44            |    ^"!" e                  /ws
  45            |     "^" quoted             /ws => "care"
  46            |    ^"`" e                  /ws
  47            |  e ^"#"                    /ws
  48            |  quoted                        => "literal"
  49
  50            |  (e ws ^"**" > e ws ^"*")
  51            |  (e ws ^"++" > e ws ^"+")
  52
  53            |     "(" word ^")"          /ws
  54            >    ^"(" alternatives ")"   /ws
  55
  56 w       !::= " "
  57            | "//" ([~\n]*) "\n"
  58            | "\n"
  59            | "\r"
  60 an       ::= [a-zA-Z0-9_]
  61 word     ::= an++                           => "sify"
  62 quoted   ::= "\"" (([~\"\\] | escaped)*) "\"" => "sify"
  63 escaped  ::= "\\n" => "\n"
  64            | "\\r" => "\r"
  65            | "\\" [~nr]
  66
  67