two version of R2R are hereHEADmaster

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+# Custom type aliases used throughout Beautiful Soup to improve readability.
+
+# Notes on improvements to the type system in newer versions of Python
+# that can be used once Beautiful Soup drops support for older
+# versions:
+#
+# * ClassVar can be put on class variables now.
+# * In 3.10, x|y is an accepted shorthand for Union[x,y].
+# * In 3.10, TypeAlias gains capabilities that can be used to
+#   improve the tree matching types (I don't remember what, exactly).
+# * In 3.9 it's possible to specialize the re.Match type,
+#   e.g. re.Match[str]. In 3.8 there's a typing.re namespace for this,
+#   but it's removed in 3.12, so to support the widest possible set of
+#   versions I'm not using it.
+
+from typing_extensions import (
+    runtime_checkable,
+    Protocol,
+    TypeAlias,
+)
+from typing import (
+    Any,
+    Callable,
+    Dict,
+    IO,
+    Iterable,
+    Mapping,
+    Optional,
+    Pattern,
+    TYPE_CHECKING,
+    Union,
+)
+
+if TYPE_CHECKING:
+    from bs4.element import (
+        AttributeValueList,
+        NamespacedAttribute,
+        NavigableString,
+        PageElement,
+        ResultSet,
+        Tag,
+    )
+
+
+@runtime_checkable
+class _RegularExpressionProtocol(Protocol):
+    """A protocol object which can accept either Python's built-in
+    `re.Pattern` objects, or the similar ``Regex`` objects defined by the
+    third-party ``regex`` package.
+    """
+
+    def search(
+        self, string: str, pos: int = ..., endpos: int = ...
+    ) -> Optional[Any]: ...
+
+    @property
+    def pattern(self) -> str: ...
+
+
+# Aliases for markup in various stages of processing.
+#
+#: The rawest form of markup: either a string, bytestring, or an open filehandle.
+_IncomingMarkup: TypeAlias = Union[str, bytes, IO[str], IO[bytes]]
+
+#: Markup that is in memory but has (potentially) yet to be converted
+#: to Unicode.
+_RawMarkup: TypeAlias = Union[str, bytes]
+
+# Aliases for character encodings
+#
+
+#: A data encoding.
+_Encoding: TypeAlias = str
+
+#: One or more data encodings.
+_Encodings: TypeAlias = Iterable[_Encoding]
+
+# Aliases for XML namespaces
+#
+
+#: The prefix for an XML namespace.
+_NamespacePrefix: TypeAlias = str
+
+#: The URL of an XML namespace
+_NamespaceURL: TypeAlias = str
+
+#: A mapping of prefixes to namespace URLs.
+_NamespaceMapping: TypeAlias = Dict[_NamespacePrefix, _NamespaceURL]
+
+#: A mapping of namespace URLs to prefixes
+_InvertedNamespaceMapping: TypeAlias = Dict[_NamespaceURL, _NamespacePrefix]
+
+# Aliases for the attribute values associated with HTML/XML tags.
+#
+
+#: The value associated with an HTML or XML attribute. This is the
+#: relatively unprocessed value Beautiful Soup expects to come from a
+#: `TreeBuilder`.
+_RawAttributeValue: TypeAlias = str
+
+#: A dictionary of names to `_RawAttributeValue` objects. This is how
+#: Beautiful Soup expects a `TreeBuilder` to represent a tag's
+#: attribute values.
+_RawAttributeValues: TypeAlias = (
+    "Mapping[Union[str, NamespacedAttribute], _RawAttributeValue]"
+)
+
+#: An attribute value in its final form, as stored in the
+# `Tag` class, after it has been processed and (in some cases)
+# split into a list of strings.
+_AttributeValue: TypeAlias = Union[str, "AttributeValueList"]
+
+#: A dictionary of names to :py:data:`_AttributeValue` objects. This is what
+#: a tag's attributes look like after processing.
+_AttributeValues: TypeAlias = Dict[str, _AttributeValue]
+
+#: The methods that deal with turning :py:data:`_RawAttributeValue` into
+#: :py:data:`_AttributeValue` may be called several times, even after the values
+#: are already processed (e.g. when cloning a tag), so they need to
+#: be able to acommodate both possibilities.
+_RawOrProcessedAttributeValues: TypeAlias = Union[_RawAttributeValues, _AttributeValues]
+
+#: A number of tree manipulation methods can take either a `PageElement` or a
+#: normal Python string (which will be converted to a `NavigableString`).
+_InsertableElement: TypeAlias = Union["PageElement", str]
+
+# Aliases to represent the many possibilities for matching bits of a
+# parse tree.
+#
+# This is very complicated because we're applying a formal type system
+# to some very DWIM code. The types we end up with will be the types
+# of the arguments to the SoupStrainer constructor and (more
+# familiarly to Beautiful Soup users) the find* methods.
+
+#: A function that takes a PageElement and returns a yes-or-no answer.
+_PageElementMatchFunction: TypeAlias = Callable[["PageElement"], bool]
+
+#: A function that takes the raw parsed ingredients of a markup tag
+#: and returns a yes-or-no answer.
+#  Not necessary at the moment.
+# _AllowTagCreationFunction:TypeAlias = Callable[[Optional[str], str, Optional[_RawAttributeValues]], bool]
+
+#: A function that takes the raw parsed ingredients of a markup string node
+#: and returns a yes-or-no answer.
+#  Not necessary at the moment.
+# _AllowStringCreationFunction:TypeAlias = Callable[[Optional[str]], bool]
+
+#: A function that takes a `Tag` and returns a yes-or-no answer.
+#: A `TagNameMatchRule` expects this kind of function, if you're
+#: going to pass it a function.
+_TagMatchFunction: TypeAlias = Callable[["Tag"], bool]
+
+#: A function that takes a single string and returns a yes-or-no
+#: answer. An `AttributeValueMatchRule` expects this kind of function, if
+#: you're going to pass it a function. So does a `StringMatchRule`.
+_StringMatchFunction: TypeAlias = Callable[[str], bool]
+
+#: Either a tag name, an attribute value or a string can be matched
+#: against a string, bytestring, regular expression, or a boolean.
+_BaseStrainable: TypeAlias = Union[str, bytes, Pattern[str], bool]
+
+#: A tag can be matched either with the `_BaseStrainable` options, or
+#: using a function that takes the `Tag` as its sole argument.
+_BaseStrainableElement: TypeAlias = Union[_BaseStrainable, _TagMatchFunction]
+
+#: A tag's attribute vgalue can be matched either with the
+#: `_BaseStrainable` options, or using a function that takes that
+#: value as its sole argument.
+_BaseStrainableAttribute: TypeAlias = Union[_BaseStrainable, _StringMatchFunction]
+
+#: A tag can be matched using either a single criterion or a list of
+#: criteria.
+_StrainableElement: TypeAlias = Union[
+    _BaseStrainableElement, Iterable[_BaseStrainableElement]
+]
+
+#: An attribute value can be matched using either a single criterion
+#: or a list of criteria.
+_StrainableAttribute: TypeAlias = Union[
+    _BaseStrainableAttribute, Iterable[_BaseStrainableAttribute]
+]
+
+#: An string can be matched using the same techniques as
+#: an attribute value.
+_StrainableString: TypeAlias = _StrainableAttribute
+
+#: A dictionary may be used to match against multiple attribute vlaues at once.
+_StrainableAttributes: TypeAlias = Dict[str, _StrainableAttribute]
+
+#: Many Beautiful soup methods return a PageElement or an ResultSet of
+#: PageElements. A PageElement is either a Tag or a NavigableString.
+#: These convenience aliases make it easier for IDE users to see which methods
+#: are available on the objects they're dealing with.
+_OneElement: TypeAlias = Union["PageElement", "Tag", "NavigableString"]
+_AtMostOneElement: TypeAlias = Optional[_OneElement]
+_QueryResults: TypeAlias = "ResultSet[_OneElement]"