Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/attr/validators.py @ 0:4f3585e2f14b draft default tip
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author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 """ |
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2 Commonly useful validators. |
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3 """ |
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4 |
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5 from __future__ import absolute_import, division, print_function |
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6 |
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7 import re |
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8 |
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9 from ._make import _AndValidator, and_, attrib, attrs |
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10 from .exceptions import NotCallableError |
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11 |
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12 |
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13 __all__ = [ |
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14 "and_", |
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15 "deep_iterable", |
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16 "deep_mapping", |
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17 "in_", |
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18 "instance_of", |
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19 "is_callable", |
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20 "matches_re", |
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21 "optional", |
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22 "provides", |
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23 ] |
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24 |
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25 |
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26 @attrs(repr=False, slots=True, hash=True) |
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27 class _InstanceOfValidator(object): |
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28 type = attrib() |
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29 |
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30 def __call__(self, inst, attr, value): |
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31 """ |
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32 We use a callable class to be able to change the ``__repr__``. |
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33 """ |
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34 if not isinstance(value, self.type): |
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35 raise TypeError( |
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36 "'{name}' must be {type!r} (got {value!r} that is a " |
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37 "{actual!r}).".format( |
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38 name=attr.name, |
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39 type=self.type, |
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40 actual=value.__class__, |
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41 value=value, |
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42 ), |
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43 attr, |
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44 self.type, |
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45 value, |
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46 ) |
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47 |
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48 def __repr__(self): |
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49 return "<instance_of validator for type {type!r}>".format( |
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50 type=self.type |
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51 ) |
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52 |
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53 |
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54 def instance_of(type): |
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55 """ |
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56 A validator that raises a `TypeError` if the initializer is called |
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57 with a wrong type for this particular attribute (checks are performed using |
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58 `isinstance` therefore it's also valid to pass a tuple of types). |
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59 |
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60 :param type: The type to check for. |
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61 :type type: type or tuple of types |
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62 |
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63 :raises TypeError: With a human readable error message, the attribute |
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64 (of type `attr.Attribute`), the expected type, and the value it |
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65 got. |
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66 """ |
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67 return _InstanceOfValidator(type) |
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68 |
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69 |
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70 @attrs(repr=False, frozen=True, slots=True) |
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71 class _MatchesReValidator(object): |
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72 regex = attrib() |
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73 flags = attrib() |
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74 match_func = attrib() |
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75 |
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76 def __call__(self, inst, attr, value): |
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77 """ |
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78 We use a callable class to be able to change the ``__repr__``. |
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79 """ |
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80 if not self.match_func(value): |
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81 raise ValueError( |
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82 "'{name}' must match regex {regex!r}" |
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83 " ({value!r} doesn't)".format( |
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84 name=attr.name, regex=self.regex.pattern, value=value |
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85 ), |
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86 attr, |
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87 self.regex, |
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88 value, |
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89 ) |
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90 |
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91 def __repr__(self): |
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92 return "<matches_re validator for pattern {regex!r}>".format( |
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93 regex=self.regex |
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94 ) |
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95 |
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96 |
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97 def matches_re(regex, flags=0, func=None): |
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98 r""" |
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99 A validator that raises `ValueError` if the initializer is called |
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100 with a string that doesn't match *regex*. |
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101 |
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102 :param str regex: a regex string to match against |
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103 :param int flags: flags that will be passed to the underlying re function |
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104 (default 0) |
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105 :param callable func: which underlying `re` function to call (options |
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106 are `re.fullmatch`, `re.search`, `re.match`, default |
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107 is ``None`` which means either `re.fullmatch` or an emulation of |
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108 it on Python 2). For performance reasons, they won't be used directly |
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109 but on a pre-`re.compile`\ ed pattern. |
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110 |
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111 .. versionadded:: 19.2.0 |
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112 """ |
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113 fullmatch = getattr(re, "fullmatch", None) |
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114 valid_funcs = (fullmatch, None, re.search, re.match) |
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115 if func not in valid_funcs: |
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116 raise ValueError( |
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117 "'func' must be one of %s." |
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118 % ( |
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119 ", ".join( |
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120 sorted( |
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121 e and e.__name__ or "None" for e in set(valid_funcs) |
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122 ) |
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123 ), |
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124 ) |
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125 ) |
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126 |
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127 pattern = re.compile(regex, flags) |
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128 if func is re.match: |
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129 match_func = pattern.match |
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130 elif func is re.search: |
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131 match_func = pattern.search |
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132 else: |
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133 if fullmatch: |
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134 match_func = pattern.fullmatch |
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135 else: |
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136 pattern = re.compile(r"(?:{})\Z".format(regex), flags) |
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137 match_func = pattern.match |
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138 |
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139 return _MatchesReValidator(pattern, flags, match_func) |
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140 |
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141 |
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142 @attrs(repr=False, slots=True, hash=True) |
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143 class _ProvidesValidator(object): |
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144 interface = attrib() |
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145 |
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146 def __call__(self, inst, attr, value): |
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147 """ |
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148 We use a callable class to be able to change the ``__repr__``. |
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149 """ |
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150 if not self.interface.providedBy(value): |
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151 raise TypeError( |
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152 "'{name}' must provide {interface!r} which {value!r} " |
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153 "doesn't.".format( |
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154 name=attr.name, interface=self.interface, value=value |
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155 ), |
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156 attr, |
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157 self.interface, |
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158 value, |
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159 ) |
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160 |
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161 def __repr__(self): |
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162 return "<provides validator for interface {interface!r}>".format( |
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163 interface=self.interface |
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164 ) |
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165 |
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166 |
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167 def provides(interface): |
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168 """ |
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169 A validator that raises a `TypeError` if the initializer is called |
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170 with an object that does not provide the requested *interface* (checks are |
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171 performed using ``interface.providedBy(value)`` (see `zope.interface |
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172 <https://zopeinterface.readthedocs.io/en/latest/>`_). |
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173 |
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174 :param interface: The interface to check for. |
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175 :type interface: ``zope.interface.Interface`` |
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176 |
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177 :raises TypeError: With a human readable error message, the attribute |
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178 (of type `attr.Attribute`), the expected interface, and the |
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179 value it got. |
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180 """ |
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181 return _ProvidesValidator(interface) |
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182 |
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183 |
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184 @attrs(repr=False, slots=True, hash=True) |
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185 class _OptionalValidator(object): |
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186 validator = attrib() |
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187 |
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188 def __call__(self, inst, attr, value): |
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189 if value is None: |
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190 return |
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191 |
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192 self.validator(inst, attr, value) |
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193 |
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194 def __repr__(self): |
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195 return "<optional validator for {what} or None>".format( |
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196 what=repr(self.validator) |
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197 ) |
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198 |
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199 |
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200 def optional(validator): |
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201 """ |
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202 A validator that makes an attribute optional. An optional attribute is one |
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203 which can be set to ``None`` in addition to satisfying the requirements of |
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204 the sub-validator. |
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205 |
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206 :param validator: A validator (or a list of validators) that is used for |
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207 non-``None`` values. |
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208 :type validator: callable or `list` of callables. |
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209 |
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210 .. versionadded:: 15.1.0 |
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211 .. versionchanged:: 17.1.0 *validator* can be a list of validators. |
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212 """ |
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213 if isinstance(validator, list): |
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214 return _OptionalValidator(_AndValidator(validator)) |
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215 return _OptionalValidator(validator) |
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216 |
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217 |
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218 @attrs(repr=False, slots=True, hash=True) |
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219 class _InValidator(object): |
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220 options = attrib() |
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221 |
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222 def __call__(self, inst, attr, value): |
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223 try: |
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224 in_options = value in self.options |
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225 except TypeError: # e.g. `1 in "abc"` |
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226 in_options = False |
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227 |
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228 if not in_options: |
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229 raise ValueError( |
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230 "'{name}' must be in {options!r} (got {value!r})".format( |
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231 name=attr.name, options=self.options, value=value |
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232 ) |
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233 ) |
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234 |
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235 def __repr__(self): |
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236 return "<in_ validator with options {options!r}>".format( |
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237 options=self.options |
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238 ) |
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239 |
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240 |
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241 def in_(options): |
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242 """ |
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243 A validator that raises a `ValueError` if the initializer is called |
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244 with a value that does not belong in the options provided. The check is |
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245 performed using ``value in options``. |
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246 |
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247 :param options: Allowed options. |
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248 :type options: list, tuple, `enum.Enum`, ... |
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249 |
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250 :raises ValueError: With a human readable error message, the attribute (of |
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251 type `attr.Attribute`), the expected options, and the value it |
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252 got. |
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253 |
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254 .. versionadded:: 17.1.0 |
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255 """ |
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256 return _InValidator(options) |
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257 |
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258 |
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259 @attrs(repr=False, slots=False, hash=True) |
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260 class _IsCallableValidator(object): |
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261 def __call__(self, inst, attr, value): |
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262 """ |
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263 We use a callable class to be able to change the ``__repr__``. |
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264 """ |
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265 if not callable(value): |
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266 message = ( |
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267 "'{name}' must be callable " |
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268 "(got {value!r} that is a {actual!r})." |
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269 ) |
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270 raise NotCallableError( |
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271 msg=message.format( |
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272 name=attr.name, value=value, actual=value.__class__ |
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273 ), |
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274 value=value, |
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275 ) |
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276 |
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277 def __repr__(self): |
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278 return "<is_callable validator>" |
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279 |
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280 |
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281 def is_callable(): |
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282 """ |
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283 A validator that raises a `attr.exceptions.NotCallableError` if the |
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284 initializer is called with a value for this particular attribute |
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285 that is not callable. |
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286 |
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287 .. versionadded:: 19.1.0 |
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288 |
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289 :raises `attr.exceptions.NotCallableError`: With a human readable error |
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290 message containing the attribute (`attr.Attribute`) name, |
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291 and the value it got. |
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292 """ |
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293 return _IsCallableValidator() |
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294 |
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295 |
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296 @attrs(repr=False, slots=True, hash=True) |
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297 class _DeepIterable(object): |
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298 member_validator = attrib(validator=is_callable()) |
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299 iterable_validator = attrib( |
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300 default=None, validator=optional(is_callable()) |
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301 ) |
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302 |
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303 def __call__(self, inst, attr, value): |
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304 """ |
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305 We use a callable class to be able to change the ``__repr__``. |
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306 """ |
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307 if self.iterable_validator is not None: |
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308 self.iterable_validator(inst, attr, value) |
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309 |
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310 for member in value: |
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311 self.member_validator(inst, attr, member) |
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312 |
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313 def __repr__(self): |
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314 iterable_identifier = ( |
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315 "" |
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316 if self.iterable_validator is None |
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317 else " {iterable!r}".format(iterable=self.iterable_validator) |
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318 ) |
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319 return ( |
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320 "<deep_iterable validator for{iterable_identifier}" |
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321 " iterables of {member!r}>" |
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322 ).format( |
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323 iterable_identifier=iterable_identifier, |
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324 member=self.member_validator, |
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325 ) |
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326 |
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327 |
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328 def deep_iterable(member_validator, iterable_validator=None): |
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329 """ |
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330 A validator that performs deep validation of an iterable. |
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331 |
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332 :param member_validator: Validator to apply to iterable members |
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333 :param iterable_validator: Validator to apply to iterable itself |
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334 (optional) |
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335 |
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336 .. versionadded:: 19.1.0 |
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337 |
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338 :raises TypeError: if any sub-validators fail |
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339 """ |
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340 return _DeepIterable(member_validator, iterable_validator) |
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341 |
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342 |
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343 @attrs(repr=False, slots=True, hash=True) |
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344 class _DeepMapping(object): |
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345 key_validator = attrib(validator=is_callable()) |
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346 value_validator = attrib(validator=is_callable()) |
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347 mapping_validator = attrib(default=None, validator=optional(is_callable())) |
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348 |
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349 def __call__(self, inst, attr, value): |
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350 """ |
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351 We use a callable class to be able to change the ``__repr__``. |
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352 """ |
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353 if self.mapping_validator is not None: |
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354 self.mapping_validator(inst, attr, value) |
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355 |
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356 for key in value: |
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357 self.key_validator(inst, attr, key) |
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358 self.value_validator(inst, attr, value[key]) |
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359 |
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360 def __repr__(self): |
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361 return ( |
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362 "<deep_mapping validator for objects mapping {key!r} to {value!r}>" |
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363 ).format(key=self.key_validator, value=self.value_validator) |
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364 |
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365 |
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366 def deep_mapping(key_validator, value_validator, mapping_validator=None): |
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367 """ |
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368 A validator that performs deep validation of a dictionary. |
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369 |
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370 :param key_validator: Validator to apply to dictionary keys |
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371 :param value_validator: Validator to apply to dictionary values |
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372 :param mapping_validator: Validator to apply to top-level mapping |
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373 attribute (optional) |
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374 |
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375 .. versionadded:: 19.1.0 |
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376 |
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377 :raises TypeError: if any sub-validators fail |
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378 """ |
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379 return _DeepMapping(key_validator, value_validator, mapping_validator) |