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- # Copyright 2006 Google, Inc. All Rights Reserved.
- # Licensed to PSF under a Contributor Agreement.
-
- # A grammar to describe tree matching patterns.
- # Not shown here:
- # - 'TOKEN' stands for any token (leaf node)
- # - 'any' stands for any node (leaf or interior)
- # With 'any' we can still specify the sub-structure.
-
- # The start symbol is 'Matcher'.
-
- Matcher: Alternatives ENDMARKER
-
- Alternatives: Alternative ('|' Alternative)*
-
- Alternative: (Unit | NegatedUnit)+
-
- Unit: [NAME '='] ( STRING [Repeater]
- | NAME [Details] [Repeater]
- | '(' Alternatives ')' [Repeater]
- | '[' Alternatives ']'
- )
-
- NegatedUnit: 'not' (STRING | NAME [Details] | '(' Alternatives ')')
-
- Repeater: '*' | '+' | '{' NUMBER [',' NUMBER] '}'
-
- Details: '<' Alternatives '>'
-