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"""
    pygments.formatter
    ~~~~~~~~~~~~~~~~~~

    Base formatter class.

    :copyright: Copyright 2006-2022 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import codecs

from pip._vendor.pygments.util import get_bool_opt
from pip._vendor.pygments.styles import get_style_by_name

__all__ = ['Formatter']


def _lookup_style(style):
    if isinstance(style, str):
        return get_style_by_name(style)
    return style


class Formatter:
    """
    Converts a token stream to text.

    Options accepted:

    ``style``
        The style to use, can be a string or a Style subclass
        (default: "default"). Not used by e.g. the
        TerminalFormatter.
    ``full``
        Tells the formatter to output a "full" document, i.e.
        a complete self-contained document. This doesn't have
        any effect for some formatters (default: false).
    ``title``
        If ``full`` is true, the title that should be used to
        caption the document (default: '').
    ``encoding``
        If given, must be an encoding name. This will be used to
        convert the Unicode token strings to byte strings in the
        output. If it is "" or None, Unicode strings will be written
        to the output file, which most file-like objects do not
        support (default: None).
    ``outencoding``
        Overrides ``encoding`` if given.
    """

    #: Name of the formatter
    name = None

    #: Shortcuts for the formatter
    aliases = []

    #: fn match rules
    filenames = []

    #: If True, this formatter outputs Unicode strings when no encoding
    #: option is given.
    unicodeoutput = True

    def __init__(self, **options):
        self.style = _lookup_style(options.get('style', 'default'))
        self.full = get_bool_opt(options, 'full', False)
        self.title = options.get('title', '')
        self.encoding = options.get('encoding', None) or None
        if self.encoding in ('guess', 'chardet'):
            # can happen for e.g. pygmentize -O encoding=guess
            self.encoding = 'utf-8'
        self.encoding = options.get('outencoding') or self.encoding
        self.options = options

    def get_style_defs(self, arg=''):
        """
        Return the style definitions for the current style as a string.

        ``arg`` is an additional argument whose meaning depends on the
        formatter used. Note that ``arg`` can also be a list or tuple
        for some formatters like the html formatter.
        """
        return ''

    def format(self, tokensource, outfile):
        """
        Format ``tokensource``, an iterable of ``(tokentype, tokenstring)``
        tuples and write it into ``outfile``.
        """
        if self.encoding:
            # wrap the outfile in a StreamWriter
            outfile = codecs.lookup(self.encoding)[3](outfile)
        return self.format_unencoded(tokensource, outfile)