tests/meta.g

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