132 lines
3.5 KiB
Python
132 lines
3.5 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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pygments.lexers.grammar_notation
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Lexers for grammer notations like BNF.
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:copyright: Copyright 2006-2015 by the Pygments team, see AUTHORS.
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:license: BSD, see LICENSE for details.
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"""
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from pygments.lexer import RegexLexer, bygroups, words
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from pygments.token import Punctuation, Text, Comment, Operator, \
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Keyword, Name, Literal
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__all__ = ['BnfLexer', 'AbnfLexer']
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class BnfLexer(RegexLexer):
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"""
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This lexer is for grammer notations which are similar to
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original BNF.
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In order to maximize a number of targets of this lexer,
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let's decide some designs:
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* We don't distinguish `Terminal Symbol`.
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* We do assume that `NonTerminal Symbol` are always enclosed
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with arrow brackets.
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* We do assume that `NonTerminal Symbol` may include
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any printable characters except arrow brackets and ASCII 0x20.
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This assumption is for `RBNF <http://www.rfc-base.org/txt/rfc-5511.txt>`_.
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* We do assume that target notation doesn't support comment.
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* We don't distinguish any operators and punctuation except
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`::=`.
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Though these desision making might cause too minimal highlighting
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and you might be disappointed, but it is reasonable for us.
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.. versionadded:: 2.1
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"""
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name = 'BNF'
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aliases = ['bnf']
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filenames = ['*.bnf']
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mimetypes = ['text/x-bnf']
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tokens = {
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'root': [
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(r'(<)([ -;=?-~]+)(>)',
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bygroups(Punctuation, Name.Class, Punctuation)),
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# an only operator
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(r'::=', Operator),
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# fallback
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(r'[^<>:]+', Text), # for performance
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(r'.', Text),
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],
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}
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class AbnfLexer(RegexLexer):
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"""
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Lexer for `IETF 7405 ABNF
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<http://www.ietf.org/rfc/rfc7405.txt>`_
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(Updates `5234 <http://www.ietf.org/rfc/rfc5234.txt>`_)
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grammars.
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.. versionadded:: 2.1
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"""
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name = 'ABNF'
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aliases = ['abnf']
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filenames = ['*.abnf']
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mimetypes = ['text/x-abnf']
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_core_rules = (
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'ALPHA', 'BIT', 'CHAR', 'CR', 'CRLF', 'CTL', 'DIGIT',
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'DQUOTE', 'HEXDIG', 'HTAB', 'LF', 'LWSP', 'OCTET',
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'SP', 'VCHAR', 'WSP')
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tokens = {
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'root': [
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# comment
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(r';.*$', Comment.Single),
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# quoted
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# double quote itself in this state, it is as '%x22'.
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(r'(%[si])?"[^"]*"', Literal),
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# binary (but i have never seen...)
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(r'%b[01]+\-[01]+\b', Literal), # range
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(r'%b[01]+(\.[01]+)*\b', Literal), # concat
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# decimal
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(r'%d[0-9]+\-[0-9]+\b', Literal), # range
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(r'%d[0-9]+(\.[0-9]+)*\b', Literal), # concat
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# hexadecimal
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(r'%x[0-9a-fA-F]+\-[0-9a-fA-F]+\b', Literal), # range
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(r'%x[0-9a-fA-F]+(\.[0-9a-fA-F]+)*\b', Literal), # concat
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# repetition (<a>*<b>element) including nRule
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(r'\b[0-9]+\*[0-9]+', Operator),
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(r'\b[0-9]+\*', Operator),
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(r'\b[0-9]+', Operator),
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(r'\*', Operator),
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# Strictly speaking, these are not keyword but
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# are called `Core Rule'.
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(words(_core_rules, suffix=r'\b'), Keyword),
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# nonterminals (ALPHA *(ALPHA / DIGIT / "-"))
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(r'[a-zA-Z][a-zA-Z0-9-]+\b', Name.Class),
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# operators
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(r'(=/|=|/)', Operator),
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# punctuation
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(r'[\[\]()]', Punctuation),
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# fallback
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(r'\s+', Text),
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(r'.', Text),
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],
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}
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