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Dir : ~/lib/python3/dist-packages/pip/_vendor/pygments/

View File Name : filter.py

"""
    pygments.filter
    ~~~~~~~~~~~~~~~

    Module that implements the default filter.

    :copyright: Copyright 2006-2021 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""


def apply_filters(stream, filters, lexer=None):
    """
    Use this method to apply an iterable of filters to
    a stream. If lexer is given it's forwarded to the
    filter, otherwise the filter receives `None`.
    """
    def _apply(filter_, stream):
        yield from filter_.filter(lexer, stream)
    for filter_ in filters:
        stream = _apply(filter_, stream)
    return stream


def simplefilter(f):
    """
    Decorator that converts a function into a filter::

        @simplefilter
        def lowercase(self, lexer, stream, options):
            for ttype, value in stream:
                yield ttype, value.lower()
    """
    return type(f.__name__, (FunctionFilter,), {
        '__module__': getattr(f, '__module__'),
        '__doc__': f.__doc__,
        'function': f,
    })


class Filter:
    """
    Default filter. Subclass this class or use the `simplefilter`
    decorator to create own filters.
    """

    def __init__(self, **options):
        self.options = options

    def filter(self, lexer, stream):
        raise NotImplementedError()


class FunctionFilter(Filter):
    """
    Abstract class used by `simplefilter` to create simple
    function filters on the fly. The `simplefilter` decorator
    automatically creates subclasses of this class for
    functions passed to it.
    """
    function = None

    def __init__(self, **options):
        if not hasattr(self, 'function'):
            raise TypeError('%r used without bound function' %
                            self.__class__.__name__)
        Filter.__init__(self, **options)

    def filter(self, lexer, stream):
        # pylint: disable=not-callable
        yield from self.function(lexer, stream, self.options)