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pygments.lexers.grammar_notation
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Lexers for grammer notations like BNF.
:copyright: Copyright 2006-2017 by the Pygments team, see AUTHORS.
:license: BSD, see LICENSE for details.
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This lexer is for grammer notations which are similar to
original BNF.
In order to maximize a number of targets of this lexer,
let's decide some designs:
* We don't distinguish `Terminal Symbol`.
* We do assume that `NonTerminal Symbol` are always enclosed
with arrow brackets.
* We do assume that `NonTerminal Symbol` may include
any printable characters except arrow brackets and ASCII 0x20.
This assumption is for `RBNF <http://www.rfc-base.org/txt/rfc-5511.txt>`_.
* We do assume that target notation doesn't support comment.
* We don't distinguish any operators and punctuation except
`::=`.
Though these desision making might cause too minimal highlighting
and you might be disappointed, but it is reasonable for us.
.. versionadded:: 2.1
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Lexer for `IETF 7405 ABNF
<http://www.ietf.org/rfc/rfc7405.txt>`_
(Updates `5234 <http://www.ietf.org/rfc/rfc5234.txt>`_)
grammars.
.. versionadded:: 2.1
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For `JSpeech Grammar Format <https://www.w3.org/TR/jsgf/>`_
grammars.
.. versionadded:: 2.2
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