1 files changed, 0 insertions, 160 deletions
diff --git a/pygments/lexers/bibtex.py b/pygments/lexers/bibtex.py
deleted file mode 100644
index 855254ef..00000000
--- a/pygments/lexers/bibtex.py
+++ /dev/null
@@ -1,160 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    pygments.lexers.bibtex
-    ~~~~~~~~~~~~~~~~~~~~~~
-
-    Lexers for BibTeX bibliography data and styles
-
-    :copyright: Copyright 2006-2019 by the Pygments team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-"""
-
-import re
-
-from pygments.lexer import RegexLexer, ExtendedRegexLexer, include, default, \
-    words
-from pygments.token import Name, Comment, String, Error, Number, Text, \
-    Keyword, Punctuation
-
-__all__ = ['BibTeXLexer', 'BSTLexer']
-
-
-class BibTeXLexer(ExtendedRegexLexer):
-    """
-    A lexer for BibTeX bibliography data format.
-
-    .. versionadded:: 2.2
-    """
-
-    name = 'BibTeX'
-    aliases = ['bib', 'bibtex']
-    filenames = ['*.bib']
-    mimetypes = ["text/x-bibtex"]
-    flags = re.IGNORECASE
-
-    ALLOWED_CHARS = r'@!$&*+\-./:;<>?\[\\\]^`|~'
-    IDENTIFIER = '[{0}][{1}]*'.format('a-z_' + ALLOWED_CHARS, r'\w' + ALLOWED_CHARS)
-
-    def open_brace_callback(self, match, ctx):
-        opening_brace = match.group()
-        ctx.opening_brace = opening_brace
-        yield match.start(), Punctuation, opening_brace
-        ctx.pos = match.end()
-
-    def close_brace_callback(self, match, ctx):
-        closing_brace = match.group()
-        if (
-            ctx.opening_brace == '{' and closing_brace != '}' or
-            ctx.opening_brace == '(' and closing_brace != ')'
-        ):
-            yield match.start(), Error, closing_brace
-        else:
-            yield match.start(), Punctuation, closing_brace
-        del ctx.opening_brace
-        ctx.pos = match.end()
-
-    tokens = {
-        'root': [
-            include('whitespace'),
-            ('@comment', Comment),
-            ('@preamble', Name.Class, ('closing-brace', 'value', 'opening-brace')),
-            ('@string', Name.Class, ('closing-brace', 'field', 'opening-brace')),
-            ('@' + IDENTIFIER, Name.Class,
-             ('closing-brace', 'command-body', 'opening-brace')),
-            ('.+', Comment),
-        ],
-        'opening-brace': [
-            include('whitespace'),
-            (r'[{(]', open_brace_callback, '#pop'),
-        ],
-        'closing-brace': [
-            include('whitespace'),
-            (r'[})]', close_brace_callback, '#pop'),
-        ],
-        'command-body': [
-            include('whitespace'),
-            (r'[^\s\,\}]+', Name.Label, ('#pop', 'fields')),
-        ],
-        'fields': [
-            include('whitespace'),
-            (',', Punctuation, 'field'),
-            default('#pop'),
-        ],
-        'field': [
-            include('whitespace'),
-            (IDENTIFIER, Name.Attribute, ('value', '=')),
-            default('#pop'),
-        ],
-        '=': [
-            include('whitespace'),
-            ('=', Punctuation, '#pop'),
-        ],
-        'value': [
-            include('whitespace'),
-            (IDENTIFIER, Name.Variable),
-            ('"', String, 'quoted-string'),
-            (r'\{', String, 'braced-string'),
-            (r'[\d]+', Number),
-            ('#', Punctuation),
-            default('#pop'),
-        ],
-        'quoted-string': [
-            (r'\{', String, 'braced-string'),
-            ('"', String, '#pop'),
-            (r'[^\{\"]+', String),
-        ],
-        'braced-string': [
-            (r'\{', String, '#push'),
-            (r'\}', String, '#pop'),
-            (r'[^\{\}]+', String),
-        ],
-        'whitespace': [
-            (r'\s+', Text),
-        ],
-    }
-
-
-class BSTLexer(RegexLexer):
-    """
-    A lexer for BibTeX bibliography styles.
-
-    .. versionadded:: 2.2
-    """
-
-    name = 'BST'
-    aliases = ['bst', 'bst-pybtex']
-    filenames = ['*.bst']
-    flags = re.IGNORECASE | re.MULTILINE
-
-    tokens = {
-        'root': [
-            include('whitespace'),
-            (words(['read', 'sort']), Keyword),
-            (words(['execute', 'integers', 'iterate', 'reverse', 'strings']),
-             Keyword, ('group')),
-            (words(['function', 'macro']), Keyword, ('group', 'group')),
-            (words(['entry']), Keyword, ('group', 'group', 'group')),
-        ],
-        'group': [
-            include('whitespace'),
-            (r'\{', Punctuation, ('#pop', 'group-end', 'body')),
-        ],
-        'group-end': [
-            include('whitespace'),
-            (r'\}', Punctuation, '#pop'),
-        ],
-        'body': [
-            include('whitespace'),
-            (r"\'[^#\"\{\}\s]+", Name.Function),
-            (r'[^#\"\{\}\s]+\$', Name.Builtin),
-            (r'[^#\"\{\}\s]+', Name.Variable),
-            (r'"[^\"]*"', String),
-            (r'#-?\d+', Number),
-            (r'\{', Punctuation, ('group-end', 'body')),
-            default('#pop'),
-        ],
-        'whitespace': [
-            (r'\s+', Text),
-            ('%.*?$', Comment.SingleLine),
-        ],
-    }