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100 lines
2.8 KiB
Python
100 lines
2.8 KiB
Python
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"""
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requests.structures
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~~~~~~~~~~~~~~~~~~~
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Data structures that power Requests.
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"""
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from collections import OrderedDict
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from .compat import Mapping, MutableMapping
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class CaseInsensitiveDict(MutableMapping):
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"""A case-insensitive ``dict``-like object.
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Implements all methods and operations of
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``MutableMapping`` as well as dict's ``copy``. Also
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provides ``lower_items``.
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All keys are expected to be strings. The structure remembers the
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case of the last key to be set, and ``iter(instance)``,
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``keys()``, ``items()``, ``iterkeys()``, and ``iteritems()``
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will contain case-sensitive keys. However, querying and contains
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testing is case insensitive::
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cid = CaseInsensitiveDict()
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cid['Accept'] = 'application/json'
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cid['aCCEPT'] == 'application/json' # True
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list(cid) == ['Accept'] # True
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For example, ``headers['content-encoding']`` will return the
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value of a ``'Content-Encoding'`` response header, regardless
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of how the header name was originally stored.
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If the constructor, ``.update``, or equality comparison
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operations are given keys that have equal ``.lower()``s, the
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behavior is undefined.
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"""
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def __init__(self, data=None, **kwargs):
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self._store = OrderedDict()
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if data is None:
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data = {}
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self.update(data, **kwargs)
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def __setitem__(self, key, value):
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# Use the lowercased key for lookups, but store the actual
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# key alongside the value.
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self._store[key.lower()] = (key, value)
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def __getitem__(self, key):
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return self._store[key.lower()][1]
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def __delitem__(self, key):
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del self._store[key.lower()]
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def __iter__(self):
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return (casedkey for casedkey, mappedvalue in self._store.values())
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def __len__(self):
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return len(self._store)
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def lower_items(self):
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"""Like iteritems(), but with all lowercase keys."""
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return ((lowerkey, keyval[1]) for (lowerkey, keyval) in self._store.items())
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def __eq__(self, other):
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if isinstance(other, Mapping):
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other = CaseInsensitiveDict(other)
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else:
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return NotImplemented
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# Compare insensitively
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return dict(self.lower_items()) == dict(other.lower_items())
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# Copy is required
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def copy(self):
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return CaseInsensitiveDict(self._store.values())
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def __repr__(self):
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return str(dict(self.items()))
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class LookupDict(dict):
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"""Dictionary lookup object."""
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def __init__(self, name=None):
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self.name = name
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super().__init__()
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def __repr__(self):
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return f"<lookup '{self.name}'>"
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def __getitem__(self, key):
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# We allow fall-through here, so values default to None
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return self.__dict__.get(key, None)
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def get(self, key, default=None):
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return self.__dict__.get(key, default)
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