tests/meta.g

   1 s             = ws Grammar ws
   2
   3 Grammar::     = Declaration +/ ws
   4
   5 Declaration   = NonTerminal
   6               | ^"#import" FileName            /ws
   7               | ^"#import" FileName "as" Word  /ws
   8
   9 FileName::    = (~[\r\n ] | escaped)+ -> [\r\n ]
  10
  11 NonTerminal   = NonTerminal:: Word            ws  "=" ws RHS
  12               | DropNT::      Word  "!"       ws  "=" ws RHS
  13               | Colons::      Word  "::"      ws  "=" ws RHS
  14               |               Word  "*"       ws ^"=" ws RHS
  15               |               Word  "*/" Word ws ^"=" ws RHS
  16
  17 RHS::         = ("|":: Sequence +/ (ws "|" ws)) +/ (ws ">" ws)
  18
  19 Elements::    = e*/ws
  20
  21 PreSequence   = Elements
  22               | (Quoted|Word)   ^"::" PreSequence /ws
  23               > PreSequence     ^"/"      e       /ws
  24               | PreSequence     ^"->"     e       /ws
  25
  26 Sequence      = PreSequence
  27               | Sequence ^"&"  Elements /ws
  28               | Sequence ^"&~" Elements /ws
  29
  30 e             =                                   e ^"!"
  31               >                (Quoted|Word) ^":" e
  32               >                NonTerminalReference:: Word
  33               |                Literal:: Quoted
  34               |                  ^"()"
  35               |                  ^"{" PreSequence "}"    /ws
  36               |                  ^"["  Range* "]"
  37               |                e ^"++"                   /ws -> ~[/]
  38               |                e ^"+"                    /ws -> ~[+]
  39               |                e ^"++/" e                /ws
  40               |                e ^"+/"  e                /ws
  41               |                e ^"**"                   /ws -> ~[/]
  42               |                e ^"*"                    /ws -> ~[*]
  43               |                e ^"**/" e                /ws
  44               |                e ^"*/"  e                /ws
  45               |                e ^"?"                    /ws
  46               |                  ^"^"   Quoted
  47               |                   "(" Word  ^")"
  48               >                  ^"(" RHS  ")"           /ws
  49               |                  ^"~" e
  50               |                  ^"\\{"
  51               |                  ^"\\}"
  52
  53 Word::        = [.a-zA-Z0-9_]++
  54 Quoted::      = "\"" (~[\"\\] | escaped)+ "\""
  55               | "\"\""
  56
  57 Range::       = ec
  58               | ec "-" ec
  59
  60 ec            = ~[\-\]\\]
  61               | escaped
  62 escaped       = "\n"::  "\\n"
  63               | "\r"::  "\\r"
  64               |         "\\" ~[nr]
  65
  66 ws!           = [ \r\n]** ("//" ~[\n]* "\n" ws)?
  67