Mercurial > repos > guerler > springsuite

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