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1 """
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2 requests.structures
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3 ~~~~~~~~~~~~~~~~~~~
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4
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5 Data structures that power Requests.
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6 """
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7
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8 from collections import OrderedDict
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9
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10 from .compat import Mapping, MutableMapping
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11
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12
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13 class CaseInsensitiveDict(MutableMapping):
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14 """A case-insensitive ``dict``-like object.
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15
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16 Implements all methods and operations of
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17 ``MutableMapping`` as well as dict's ``copy``. Also
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18 provides ``lower_items``.
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19
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20 All keys are expected to be strings. The structure remembers the
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21 case of the last key to be set, and ``iter(instance)``,
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22 ``keys()``, ``items()``, ``iterkeys()``, and ``iteritems()``
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23 will contain case-sensitive keys. However, querying and contains
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24 testing is case insensitive::
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25
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26 cid = CaseInsensitiveDict()
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27 cid['Accept'] = 'application/json'
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28 cid['aCCEPT'] == 'application/json' # True
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29 list(cid) == ['Accept'] # True
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30
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31 For example, ``headers['content-encoding']`` will return the
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32 value of a ``'Content-Encoding'`` response header, regardless
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33 of how the header name was originally stored.
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34
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35 If the constructor, ``.update``, or equality comparison
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36 operations are given keys that have equal ``.lower()``s, the
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37 behavior is undefined.
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38 """
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39
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40 def __init__(self, data=None, **kwargs):
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41 self._store = OrderedDict()
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42 if data is None:
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43 data = {}
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44 self.update(data, **kwargs)
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45
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46 def __setitem__(self, key, value):
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47 # Use the lowercased key for lookups, but store the actual
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48 # key alongside the value.
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49 self._store[key.lower()] = (key, value)
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50
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51 def __getitem__(self, key):
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52 return self._store[key.lower()][1]
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53
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54 def __delitem__(self, key):
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55 del self._store[key.lower()]
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56
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57 def __iter__(self):
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58 return (casedkey for casedkey, mappedvalue in self._store.values())
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59
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60 def __len__(self):
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61 return len(self._store)
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62
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63 def lower_items(self):
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64 """Like iteritems(), but with all lowercase keys."""
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65 return ((lowerkey, keyval[1]) for (lowerkey, keyval) in self._store.items())
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66
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67 def __eq__(self, other):
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68 if isinstance(other, Mapping):
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69 other = CaseInsensitiveDict(other)
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70 else:
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71 return NotImplemented
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72 # Compare insensitively
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73 return dict(self.lower_items()) == dict(other.lower_items())
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74
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75 # Copy is required
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76 def copy(self):
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77 return CaseInsensitiveDict(self._store.values())
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78
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79 def __repr__(self):
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80 return str(dict(self.items()))
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81
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82
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83 class LookupDict(dict):
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84 """Dictionary lookup object."""
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85
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86 def __init__(self, name=None):
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87 self.name = name
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88 super().__init__()
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89
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90 def __repr__(self):
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91 return f"<lookup '{self.name}'>"
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92
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93 def __getitem__(self, key):
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94 # We allow fall-through here, so values default to None
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95
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96 return self.__dict__.get(key, None)
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97
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98 def get(self, key, default=None):
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99 return self.__dict__.get(key, default)
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