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annotate planemo/lib/python3.7/site-packages/humanfriendly/case.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1 # Human friendly input/output in Python.
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2 #
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3 # Author: Peter Odding <peter@peterodding.com>
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4 # Last Change: April 19, 2020
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5 # URL: https://humanfriendly.readthedocs.io
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6
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7 """
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8 Simple case insensitive dictionaries.
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9
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10 The :class:`CaseInsensitiveDict` class is a dictionary whose string keys
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11 are case insensitive. It works by automatically coercing string keys to
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12 :class:`CaseInsensitiveKey` objects. Keys that are not strings are
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13 supported as well, just without case insensitivity.
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14
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15 At its core this module works by normalizing strings to lowercase before
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16 comparing or hashing them. It doesn't support proper case folding nor
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17 does it support Unicode normalization, hence the word "simple".
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18 """
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19
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20 # Standard library modules.
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21 import collections
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22
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23 try:
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24 # Python >= 3.3.
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25 from collections.abc import Iterable, Mapping
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26 except ImportError:
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27 # Python 2.7.
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28 from collections import Iterable, Mapping
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29
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30 # Modules included in our package.
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31 from humanfriendly.compat import basestring, unicode
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32
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33 # Public identifiers that require documentation.
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34 __all__ = ("CaseInsensitiveDict", "CaseInsensitiveKey")
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35
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36
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37 class CaseInsensitiveDict(collections.OrderedDict):
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38
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39 """
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40 Simple case insensitive dictionary implementation (that remembers insertion order).
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41
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42 This class works by overriding methods that deal with dictionary keys to
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43 coerce string keys to :class:`CaseInsensitiveKey` objects before calling
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44 down to the regular dictionary handling methods. While intended to be
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45 complete this class has not been extensively tested yet.
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46 """
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47
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48 def __init__(self, other=None, **kw):
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49 """Initialize a :class:`CaseInsensitiveDict` object."""
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50 # Initialize our superclass.
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51 super(CaseInsensitiveDict, self).__init__()
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52 # Handle the initializer arguments.
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53 self.update(other, **kw)
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54
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55 def coerce_key(self, key):
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56 """
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57 Coerce string keys to :class:`CaseInsensitiveKey` objects.
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58
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59 :param key: The value to coerce (any type).
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60 :returns: If `key` is a string then a :class:`CaseInsensitiveKey`
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61 object is returned, otherwise the value of `key` is
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62 returned unmodified.
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63 """
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64 if isinstance(key, basestring):
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65 key = CaseInsensitiveKey(key)
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66 return key
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67
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68 @classmethod
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69 def fromkeys(cls, iterable, value=None):
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70 """Create a case insensitive dictionary with keys from `iterable` and values set to `value`."""
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71 return cls((k, value) for k in iterable)
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72
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73 def get(self, key, default=None):
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74 """Get the value of an existing item."""
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75 return super(CaseInsensitiveDict, self).get(self.coerce_key(key), default)
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76
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77 def pop(self, key, default=None):
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78 """Remove an item from a case insensitive dictionary."""
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79 return super(CaseInsensitiveDict, self).pop(self.coerce_key(key), default)
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80
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81 def setdefault(self, key, default=None):
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82 """Get the value of an existing item or add a new item."""
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83 return super(CaseInsensitiveDict, self).setdefault(self.coerce_key(key), default)
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84
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85 def update(self, other=None, **kw):
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86 """Update a case insensitive dictionary with new items."""
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87 if isinstance(other, Mapping):
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88 # Copy the items from the given mapping.
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89 for key, value in other.items():
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90 self[key] = value
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91 elif isinstance(other, Iterable):
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92 # Copy the items from the given iterable.
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93 for key, value in other:
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94 self[key] = value
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95 elif other is not None:
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96 # Complain about unsupported values.
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97 msg = "'%s' object is not iterable"
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98 type_name = type(value).__name__
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99 raise TypeError(msg % type_name)
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100 # Copy the keyword arguments (if any).
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101 for key, value in kw.items():
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102 self[key] = value
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103
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104 def __contains__(self, key):
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105 """Check if a case insensitive dictionary contains the given key."""
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106 return super(CaseInsensitiveDict, self).__contains__(self.coerce_key(key))
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107
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108 def __delitem__(self, key):
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109 """Delete an item in a case insensitive dictionary."""
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110 return super(CaseInsensitiveDict, self).__delitem__(self.coerce_key(key))
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111
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112 def __getitem__(self, key):
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113 """Get the value of an item in a case insensitive dictionary."""
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114 return super(CaseInsensitiveDict, self).__getitem__(self.coerce_key(key))
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115
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116 def __setitem__(self, key, value):
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117 """Set the value of an item in a case insensitive dictionary."""
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118 return super(CaseInsensitiveDict, self).__setitem__(self.coerce_key(key), value)
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119
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120
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121 class CaseInsensitiveKey(unicode):
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122
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123 """
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124 Simple case insensitive dictionary key implementation.
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125
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126 The :class:`CaseInsensitiveKey` class provides an intentionally simple
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127 implementation of case insensitive strings to be used as dictionary keys.
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128
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129 If you need features like Unicode normalization or proper case folding
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130 please consider using a more advanced implementation like the :pypi:`istr`
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131 package instead.
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132 """
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133
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134 def __new__(cls, value):
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135 """Create a :class:`CaseInsensitiveKey` object."""
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136 # Delegate string object creation to our superclass.
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137 obj = unicode.__new__(cls, value)
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138 # Store the lowercased string and its hash value.
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139 normalized = obj.lower()
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140 obj._normalized = normalized
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141 obj._hash_value = hash(normalized)
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142 return obj
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143
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144 def __hash__(self):
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145 """Get the hash value of the lowercased string."""
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146 return self._hash_value
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147
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148 def __eq__(self, other):
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149 """Compare two strings as lowercase."""
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150 if isinstance(other, CaseInsensitiveKey):
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151 # Fast path (and the most common case): Comparison with same type.
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152 return self._normalized == other._normalized
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153 elif isinstance(other, unicode):
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154 # Slow path: Comparison with strings that need lowercasing.
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155 return self._normalized == other.lower()
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156 else:
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157 return NotImplemented