Uploaded Test files

venv/Lib/site-packages/pygments/lexers/bibtex.py

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+# -*- coding: utf-8 -*-
+"""
+    pygments.lexers.bibtex
+    ~~~~~~~~~~~~~~~~~~~~~~
+
+    Lexers for BibTeX bibliography data and styles
+
+    :copyright: Copyright 2006-2020 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 = '[{}][{}]*'.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),
+        ],
+    }