AppPkg/Applications/Python/Python-2.7.2/Lib/lib2to3/PatternGrammar.txt

   1 # Copyright 2006 Google, Inc. All Rights Reserved.
   2 # Licensed to PSF under a Contributor Agreement.
   3
   4 # A grammar to describe tree matching patterns.
   5 # Not shown here:
   6 # - 'TOKEN' stands for any token (leaf node)
   7 # - 'any' stands for any node (leaf or interior)
   8 # With 'any' we can still specify the sub-structure.
   9
  10 # The start symbol is 'Matcher'.
  11
  12 Matcher: Alternatives ENDMARKER
  13
  14 Alternatives: Alternative ('|' Alternative)*
  15
  16 Alternative: (Unit | NegatedUnit)+
  17
  18 Unit: [NAME '='] ( STRING [Repeater]
  19                  | NAME [Details] [Repeater]
  20                  | '(' Alternatives ')' [Repeater]
  21                  | '[' Alternatives ']'
  22                  )
  23
  24 NegatedUnit: 'not' (STRING | NAME [Details] | '(' Alternatives ')')
  25
  26 Repeater: '*' | '+' | '{' NUMBER [',' NUMBER] '}'
  27
  28 Details: '<' Alternatives '>'