tests/meta.g

   1 s         ::=  ws grammar ws                  => "gram"
   2 ws       !::=  w**
   3 wp       !::=  w++
   4 grammar   ::=  r +/ ws                        => "grammar"
   5
   6 r         ::=  word  ^"::=" alternatives /ws
   7             |  word ^"!::=" alternatives /ws
   8
   9 alternatives  ::=  (conjuncts +/ (ws "|" ws)) +/ (ws ">" ws)
  10
  11 conjuncts     ::=  sequence
  12                 |  sequence ^"&"  e*/ws   /ws
  13                 |  sequence ^"&~" e*/ws   /ws
  14
  15 ps          ::= e*/ws                              => "ps"
  16               | (e+/ws ws)? "^" quoted (ws e+/ws)? => "ps2"
  17 psx         ::= ps
  18               | ps wp ^"/" ws e
  19 sequence    ::= psx
  20               | psx ^"=>" (word|quoted) /ws
  21
  22 ec       ::= [~\-\]\\\~]
  23            | escaped
  24
  25 range    ::= ec          => "range"
  26            | ec ^"-" ec
  27
  28 e        ::=  word                          => "nonTerminal"
  29            |  quoted                        => "literal"
  30            |    ^"()"
  31            |    ^"{" sequence "}"       /ws
  32            |    ^"["  range* "]"
  33            |    ^"[~" range* "]"
  34
  35            |  (e ws ^"**" > e ws ^"*")
  36            |  e ^"*/" e                 /ws
  37            |  (e ws ^"++" > e ws ^"+")
  38            |  e ^"+/" e                 /ws
  39            |  e ^"?"                    /ws
  40
  41            |     "(" word         ^")"  /ws
  42            >    ^"(" alternatives  ")"  /ws
  43 w       !::= " "
  44            | "//" ([~\n]*) "\n"
  45            | "\n"
  46            | "\r"
  47 word     ::= [a-zA-Z0-9_]++
  48 quoted   ::= "\"" (([~\"\\] | escaped)+) "\""
  49            | "\"\"" => ""
  50 escaped  ::= "\\n" => "\n"
  51            | "\\r" => "\r"
  52            | "\\" [~nr]
  53
  54