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annotate lib/python3.8/site-packages/pip/_vendor/packaging/requirements.py @ 0:9e54283cc701 draft

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"planemo upload commit d12c32a45bcd441307e632fca6d9af7d60289d44"
author guerler
date Mon, 27 Jul 2020 03:47:31 -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 string
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7 import re
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8
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9 from pip._vendor.pyparsing import stringStart, stringEnd, originalTextFor, ParseException
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10 from pip._vendor.pyparsing import ZeroOrMore, Word, Optional, Regex, Combine
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11 from pip._vendor.pyparsing import Literal as L # noqa
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12 from pip._vendor.six.moves.urllib import parse as urlparse
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13
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14 from ._typing import MYPY_CHECK_RUNNING
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15 from .markers import MARKER_EXPR, Marker
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16 from .specifiers import LegacySpecifier, Specifier, SpecifierSet
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17
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18 if MYPY_CHECK_RUNNING: # pragma: no cover
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19 from typing import List
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20
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21
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22 class InvalidRequirement(ValueError):
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23 """
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24 An invalid requirement was found, users should refer to PEP 508.
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25 """
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26
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27
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28 ALPHANUM = Word(string.ascii_letters + string.digits)
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29
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30 LBRACKET = L("[").suppress()
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31 RBRACKET = L("]").suppress()
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32 LPAREN = L("(").suppress()
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33 RPAREN = L(")").suppress()
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34 COMMA = L(",").suppress()
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35 SEMICOLON = L(";").suppress()
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36 AT = L("@").suppress()
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37
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38 PUNCTUATION = Word("-_.")
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39 IDENTIFIER_END = ALPHANUM | (ZeroOrMore(PUNCTUATION) + ALPHANUM)
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40 IDENTIFIER = Combine(ALPHANUM + ZeroOrMore(IDENTIFIER_END))
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41
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42 NAME = IDENTIFIER("name")
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43 EXTRA = IDENTIFIER
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44
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45 URI = Regex(r"[^ ]+")("url")
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46 URL = AT + URI
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47
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48 EXTRAS_LIST = EXTRA + ZeroOrMore(COMMA + EXTRA)
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49 EXTRAS = (LBRACKET + Optional(EXTRAS_LIST) + RBRACKET)("extras")
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50
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51 VERSION_PEP440 = Regex(Specifier._regex_str, re.VERBOSE | re.IGNORECASE)
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52 VERSION_LEGACY = Regex(LegacySpecifier._regex_str, re.VERBOSE | re.IGNORECASE)
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53
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54 VERSION_ONE = VERSION_PEP440 ^ VERSION_LEGACY
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55 VERSION_MANY = Combine(
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56 VERSION_ONE + ZeroOrMore(COMMA + VERSION_ONE), joinString=",", adjacent=False
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57 )("_raw_spec")
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58 _VERSION_SPEC = Optional(((LPAREN + VERSION_MANY + RPAREN) | VERSION_MANY))
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59 _VERSION_SPEC.setParseAction(lambda s, l, t: t._raw_spec or "")
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60
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61 VERSION_SPEC = originalTextFor(_VERSION_SPEC)("specifier")
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62 VERSION_SPEC.setParseAction(lambda s, l, t: t[1])
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63
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64 MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker")
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65 MARKER_EXPR.setParseAction(
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66 lambda s, l, t: Marker(s[t._original_start : t._original_end])
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67 )
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68 MARKER_SEPARATOR = SEMICOLON
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69 MARKER = MARKER_SEPARATOR + MARKER_EXPR
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70
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71 VERSION_AND_MARKER = VERSION_SPEC + Optional(MARKER)
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72 URL_AND_MARKER = URL + Optional(MARKER)
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73
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74 NAMED_REQUIREMENT = NAME + Optional(EXTRAS) + (URL_AND_MARKER | VERSION_AND_MARKER)
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75
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76 REQUIREMENT = stringStart + NAMED_REQUIREMENT + stringEnd
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77 # pyparsing isn't thread safe during initialization, so we do it eagerly, see
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78 # issue #104
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79 REQUIREMENT.parseString("x[]")
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80
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81
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82 class Requirement(object):
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83 """Parse a requirement.
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84
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85 Parse a given requirement string into its parts, such as name, specifier,
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86 URL, and extras. Raises InvalidRequirement on a badly-formed requirement
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87 string.
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88 """
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89
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90 # TODO: Can we test whether something is contained within a requirement?
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91 # If so how do we do that? Do we need to test against the _name_ of
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92 # the thing as well as the version? What about the markers?
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93 # TODO: Can we normalize the name and extra name?
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94
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95 def __init__(self, requirement_string):
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96 # type: (str) -> None
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97 try:
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98 req = REQUIREMENT.parseString(requirement_string)
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99 except ParseException as e:
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100 raise InvalidRequirement(
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101 'Parse error at "{0!r}": {1}'.format(
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102 requirement_string[e.loc : e.loc + 8], e.msg
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103 )
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104 )
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105
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106 self.name = req.name
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107 if req.url:
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108 parsed_url = urlparse.urlparse(req.url)
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109 if parsed_url.scheme == "file":
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110 if urlparse.urlunparse(parsed_url) != req.url:
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111 raise InvalidRequirement("Invalid URL given")
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112 elif not (parsed_url.scheme and parsed_url.netloc) or (
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113 not parsed_url.scheme and not parsed_url.netloc
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114 ):
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115 raise InvalidRequirement("Invalid URL: {0}".format(req.url))
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116 self.url = req.url
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117 else:
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118 self.url = None
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119 self.extras = set(req.extras.asList() if req.extras else [])
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120 self.specifier = SpecifierSet(req.specifier)
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121 self.marker = req.marker if req.marker else None
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122
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123 def __str__(self):
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124 # type: () -> str
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125 parts = [self.name] # type: List[str]
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126
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127 if self.extras:
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128 parts.append("[{0}]".format(",".join(sorted(self.extras))))
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129
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130 if self.specifier:
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131 parts.append(str(self.specifier))
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132
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133 if self.url:
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134 parts.append("@ {0}".format(self.url))
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135 if self.marker:
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136 parts.append(" ")
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137
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138 if self.marker:
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139 parts.append("; {0}".format(self.marker))
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140
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141 return "".join(parts)
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142
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143 def __repr__(self):
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144 # type: () -> str
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145 return "<Requirement({0!r})>".format(str(self))