Mercurial > repos > shellac > sam_consensus_v3
annotate env/lib/python3.9/site-packages/packaging/markers.py @ 0:4f3585e2f14b draft default tip
"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author | shellac |
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date | Mon, 22 Mar 2021 18:12:50 +0000 |
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1 # This file is dual licensed under the terms of the Apache License, Version |
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2 # 2.0, and the BSD License. See the LICENSE file in the root of this repository |
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3 # for complete details. |
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4 from __future__ import absolute_import, division, print_function |
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5 |
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6 import operator |
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7 import os |
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8 import platform |
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9 import sys |
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10 |
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11 from pyparsing import ( # noqa: N817 |
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12 Forward, |
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13 Group, |
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14 Literal as L, |
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15 ParseException, |
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16 ParseResults, |
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17 QuotedString, |
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18 ZeroOrMore, |
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19 stringEnd, |
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20 stringStart, |
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21 ) |
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22 |
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23 from ._compat import string_types |
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24 from ._typing import TYPE_CHECKING |
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25 from .specifiers import InvalidSpecifier, Specifier |
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26 |
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27 if TYPE_CHECKING: # pragma: no cover |
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28 from typing import Any, Callable, Dict, List, Optional, Tuple, Union |
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29 |
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30 Operator = Callable[[str, str], bool] |
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31 |
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32 |
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33 __all__ = [ |
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34 "InvalidMarker", |
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35 "UndefinedComparison", |
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36 "UndefinedEnvironmentName", |
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37 "Marker", |
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38 "default_environment", |
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39 ] |
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40 |
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41 |
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42 class InvalidMarker(ValueError): |
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43 """ |
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44 An invalid marker was found, users should refer to PEP 508. |
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45 """ |
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46 |
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47 |
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48 class UndefinedComparison(ValueError): |
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49 """ |
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50 An invalid operation was attempted on a value that doesn't support it. |
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51 """ |
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52 |
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53 |
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54 class UndefinedEnvironmentName(ValueError): |
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55 """ |
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56 A name was attempted to be used that does not exist inside of the |
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57 environment. |
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58 """ |
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59 |
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60 |
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61 class Node(object): |
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62 def __init__(self, value): |
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63 # type: (Any) -> None |
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64 self.value = value |
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65 |
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66 def __str__(self): |
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67 # type: () -> str |
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68 return str(self.value) |
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69 |
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70 def __repr__(self): |
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71 # type: () -> str |
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72 return "<{0}({1!r})>".format(self.__class__.__name__, str(self)) |
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73 |
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74 def serialize(self): |
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75 # type: () -> str |
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76 raise NotImplementedError |
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77 |
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78 |
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79 class Variable(Node): |
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80 def serialize(self): |
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81 # type: () -> str |
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82 return str(self) |
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83 |
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84 |
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85 class Value(Node): |
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86 def serialize(self): |
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87 # type: () -> str |
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88 return '"{0}"'.format(self) |
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89 |
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90 |
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91 class Op(Node): |
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92 def serialize(self): |
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93 # type: () -> str |
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94 return str(self) |
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95 |
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96 |
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97 VARIABLE = ( |
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98 L("implementation_version") |
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99 | L("platform_python_implementation") |
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100 | L("implementation_name") |
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101 | L("python_full_version") |
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102 | L("platform_release") |
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103 | L("platform_version") |
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104 | L("platform_machine") |
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105 | L("platform_system") |
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106 | L("python_version") |
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107 | L("sys_platform") |
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108 | L("os_name") |
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109 | L("os.name") # PEP-345 |
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110 | L("sys.platform") # PEP-345 |
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111 | L("platform.version") # PEP-345 |
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112 | L("platform.machine") # PEP-345 |
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113 | L("platform.python_implementation") # PEP-345 |
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114 | L("python_implementation") # undocumented setuptools legacy |
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115 | L("extra") # PEP-508 |
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116 ) |
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117 ALIASES = { |
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118 "os.name": "os_name", |
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119 "sys.platform": "sys_platform", |
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120 "platform.version": "platform_version", |
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121 "platform.machine": "platform_machine", |
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122 "platform.python_implementation": "platform_python_implementation", |
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123 "python_implementation": "platform_python_implementation", |
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124 } |
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125 VARIABLE.setParseAction(lambda s, l, t: Variable(ALIASES.get(t[0], t[0]))) |
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126 |
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127 VERSION_CMP = ( |
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128 L("===") | L("==") | L(">=") | L("<=") | L("!=") | L("~=") | L(">") | L("<") |
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129 ) |
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130 |
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131 MARKER_OP = VERSION_CMP | L("not in") | L("in") |
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132 MARKER_OP.setParseAction(lambda s, l, t: Op(t[0])) |
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133 |
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134 MARKER_VALUE = QuotedString("'") | QuotedString('"') |
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135 MARKER_VALUE.setParseAction(lambda s, l, t: Value(t[0])) |
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136 |
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137 BOOLOP = L("and") | L("or") |
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138 |
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139 MARKER_VAR = VARIABLE | MARKER_VALUE |
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140 |
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141 MARKER_ITEM = Group(MARKER_VAR + MARKER_OP + MARKER_VAR) |
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142 MARKER_ITEM.setParseAction(lambda s, l, t: tuple(t[0])) |
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143 |
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144 LPAREN = L("(").suppress() |
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145 RPAREN = L(")").suppress() |
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146 |
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147 MARKER_EXPR = Forward() |
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148 MARKER_ATOM = MARKER_ITEM | Group(LPAREN + MARKER_EXPR + RPAREN) |
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149 MARKER_EXPR << MARKER_ATOM + ZeroOrMore(BOOLOP + MARKER_EXPR) |
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150 |
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151 MARKER = stringStart + MARKER_EXPR + stringEnd |
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152 |
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153 |
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154 def _coerce_parse_result(results): |
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155 # type: (Union[ParseResults, List[Any]]) -> List[Any] |
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156 if isinstance(results, ParseResults): |
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157 return [_coerce_parse_result(i) for i in results] |
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158 else: |
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159 return results |
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160 |
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161 |
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162 def _format_marker(marker, first=True): |
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163 # type: (Union[List[str], Tuple[Node, ...], str], Optional[bool]) -> str |
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164 |
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165 assert isinstance(marker, (list, tuple, string_types)) |
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166 |
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167 # Sometimes we have a structure like [[...]] which is a single item list |
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168 # where the single item is itself it's own list. In that case we want skip |
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169 # the rest of this function so that we don't get extraneous () on the |
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170 # outside. |
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171 if ( |
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172 isinstance(marker, list) |
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173 and len(marker) == 1 |
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174 and isinstance(marker[0], (list, tuple)) |
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175 ): |
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176 return _format_marker(marker[0]) |
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177 |
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178 if isinstance(marker, list): |
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179 inner = (_format_marker(m, first=False) for m in marker) |
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180 if first: |
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181 return " ".join(inner) |
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182 else: |
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183 return "(" + " ".join(inner) + ")" |
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184 elif isinstance(marker, tuple): |
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185 return " ".join([m.serialize() for m in marker]) |
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186 else: |
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187 return marker |
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188 |
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189 |
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190 _operators = { |
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191 "in": lambda lhs, rhs: lhs in rhs, |
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192 "not in": lambda lhs, rhs: lhs not in rhs, |
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193 "<": operator.lt, |
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194 "<=": operator.le, |
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195 "==": operator.eq, |
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196 "!=": operator.ne, |
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197 ">=": operator.ge, |
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198 ">": operator.gt, |
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199 } # type: Dict[str, Operator] |
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200 |
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201 |
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202 def _eval_op(lhs, op, rhs): |
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203 # type: (str, Op, str) -> bool |
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204 try: |
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205 spec = Specifier("".join([op.serialize(), rhs])) |
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206 except InvalidSpecifier: |
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207 pass |
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208 else: |
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209 return spec.contains(lhs) |
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210 |
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211 oper = _operators.get(op.serialize()) # type: Optional[Operator] |
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212 if oper is None: |
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213 raise UndefinedComparison( |
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214 "Undefined {0!r} on {1!r} and {2!r}.".format(op, lhs, rhs) |
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215 ) |
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216 |
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217 return oper(lhs, rhs) |
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218 |
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219 |
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220 class Undefined(object): |
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221 pass |
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222 |
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223 |
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224 _undefined = Undefined() |
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225 |
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226 |
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227 def _get_env(environment, name): |
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228 # type: (Dict[str, str], str) -> str |
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229 value = environment.get(name, _undefined) # type: Union[str, Undefined] |
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230 |
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231 if isinstance(value, Undefined): |
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232 raise UndefinedEnvironmentName( |
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233 "{0!r} does not exist in evaluation environment.".format(name) |
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234 ) |
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235 |
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236 return value |
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237 |
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238 |
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239 def _evaluate_markers(markers, environment): |
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240 # type: (List[Any], Dict[str, str]) -> bool |
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241 groups = [[]] # type: List[List[bool]] |
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242 |
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243 for marker in markers: |
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244 assert isinstance(marker, (list, tuple, string_types)) |
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245 |
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246 if isinstance(marker, list): |
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247 groups[-1].append(_evaluate_markers(marker, environment)) |
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248 elif isinstance(marker, tuple): |
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249 lhs, op, rhs = marker |
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250 |
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251 if isinstance(lhs, Variable): |
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252 lhs_value = _get_env(environment, lhs.value) |
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253 rhs_value = rhs.value |
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254 else: |
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255 lhs_value = lhs.value |
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256 rhs_value = _get_env(environment, rhs.value) |
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257 |
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258 groups[-1].append(_eval_op(lhs_value, op, rhs_value)) |
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259 else: |
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260 assert marker in ["and", "or"] |
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261 if marker == "or": |
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262 groups.append([]) |
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263 |
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264 return any(all(item) for item in groups) |
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265 |
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266 |
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267 def format_full_version(info): |
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268 # type: (sys._version_info) -> str |
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269 version = "{0.major}.{0.minor}.{0.micro}".format(info) |
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270 kind = info.releaselevel |
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271 if kind != "final": |
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272 version += kind[0] + str(info.serial) |
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273 return version |
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274 |
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275 |
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276 def default_environment(): |
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277 # type: () -> Dict[str, str] |
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278 if hasattr(sys, "implementation"): |
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279 # Ignoring the `sys.implementation` reference for type checking due to |
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280 # mypy not liking that the attribute doesn't exist in Python 2.7 when |
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281 # run with the `--py27` flag. |
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282 iver = format_full_version(sys.implementation.version) # type: ignore |
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283 implementation_name = sys.implementation.name # type: ignore |
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284 else: |
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285 iver = "0" |
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286 implementation_name = "" |
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287 |
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288 return { |
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289 "implementation_name": implementation_name, |
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290 "implementation_version": iver, |
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291 "os_name": os.name, |
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292 "platform_machine": platform.machine(), |
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293 "platform_release": platform.release(), |
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294 "platform_system": platform.system(), |
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295 "platform_version": platform.version(), |
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296 "python_full_version": platform.python_version(), |
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297 "platform_python_implementation": platform.python_implementation(), |
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298 "python_version": ".".join(platform.python_version_tuple()[:2]), |
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299 "sys_platform": sys.platform, |
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300 } |
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301 |
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302 |
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303 class Marker(object): |
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304 def __init__(self, marker): |
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305 # type: (str) -> None |
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306 try: |
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307 self._markers = _coerce_parse_result(MARKER.parseString(marker)) |
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308 except ParseException as e: |
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309 err_str = "Invalid marker: {0!r}, parse error at {1!r}".format( |
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310 marker, marker[e.loc : e.loc + 8] |
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311 ) |
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312 raise InvalidMarker(err_str) |
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313 |
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314 def __str__(self): |
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315 # type: () -> str |
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316 return _format_marker(self._markers) |
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317 |
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318 def __repr__(self): |
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319 # type: () -> str |
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320 return "<Marker({0!r})>".format(str(self)) |
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321 |
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322 def evaluate(self, environment=None): |
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323 # type: (Optional[Dict[str, str]]) -> bool |
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324 """Evaluate a marker. |
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325 |
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326 Return the boolean from evaluating the given marker against the |
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327 environment. environment is an optional argument to override all or |
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328 part of the determined environment. |
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329 |
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330 The environment is determined from the current Python process. |
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331 """ |
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332 current_environment = default_environment() |
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333 if environment is not None: |
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334 current_environment.update(environment) |
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335 |
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336 return _evaluate_markers(self._markers, current_environment) |