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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 annotations
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5
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6 from typing import Any, Iterator
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7
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8 from ._parser import parse_requirement as _parse_requirement
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9 from ._tokenizer import ParserSyntaxError
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10 from .markers import Marker, _normalize_extra_values
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11 from .specifiers import SpecifierSet
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12 from .utils import canonicalize_name
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13
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14
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15 class InvalidRequirement(ValueError):
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16 """
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17 An invalid requirement was found, users should refer to PEP 508.
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18 """
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19
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20
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21 class Requirement:
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22 """Parse a requirement.
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23
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24 Parse a given requirement string into its parts, such as name, specifier,
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25 URL, and extras. Raises InvalidRequirement on a badly-formed requirement
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26 string.
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27 """
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28
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29 # TODO: Can we test whether something is contained within a requirement?
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30 # If so how do we do that? Do we need to test against the _name_ of
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31 # the thing as well as the version? What about the markers?
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32 # TODO: Can we normalize the name and extra name?
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33
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34 def __init__(self, requirement_string: str) -> None:
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35 try:
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36 parsed = _parse_requirement(requirement_string)
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37 except ParserSyntaxError as e:
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38 raise InvalidRequirement(str(e)) from e
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39
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40 self.name: str = parsed.name
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41 self.url: str | None = parsed.url or None
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42 self.extras: set[str] = set(parsed.extras or [])
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43 self.specifier: SpecifierSet = SpecifierSet(parsed.specifier)
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44 self.marker: Marker | None = None
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45 if parsed.marker is not None:
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46 self.marker = Marker.__new__(Marker)
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47 self.marker._markers = _normalize_extra_values(parsed.marker)
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48
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49 def _iter_parts(self, name: str) -> Iterator[str]:
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50 yield name
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51
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52 if self.extras:
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53 formatted_extras = ",".join(sorted(self.extras))
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54 yield f"[{formatted_extras}]"
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55
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56 if self.specifier:
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57 yield str(self.specifier)
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58
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59 if self.url:
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60 yield f"@ {self.url}"
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61 if self.marker:
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62 yield " "
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63
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64 if self.marker:
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65 yield f"; {self.marker}"
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66
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67 def __str__(self) -> str:
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68 return "".join(self._iter_parts(self.name))
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69
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70 def __repr__(self) -> str:
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71 return f"<Requirement('{self}')>"
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72
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73 def __hash__(self) -> int:
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74 return hash(
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75 (
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76 self.__class__.__name__,
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77 *self._iter_parts(canonicalize_name(self.name)),
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78 )
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79 )
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80
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81 def __eq__(self, other: Any) -> bool:
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82 if not isinstance(other, Requirement):
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83 return NotImplemented
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84
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85 return (
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86 canonicalize_name(self.name) == canonicalize_name(other.name)
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87 and self.extras == other.extras
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88 and self.specifier == other.specifier
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89 and self.url == other.url
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90 and self.marker == other.marker
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91 )
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