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requirements.py
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# This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. import urllib.parse from typing import Any, List, Optional, Set from ._parser import parse_requirement as _parse_requirement from ._tokenizer import ParserSyntaxError from .markers import Marker, _normalize_extra_values from .specifiers import SpecifierSet class InvalidRequirement(ValueError): """ An invalid requirement was found, users should refer to PEP 508. """ class Requirement: """Parse a requirement. Parse a given requirement string into its parts, such as name, specifier, URL, and extras. Raises InvalidRequirement on a badly-formed requirement string. """ # TODO: Can we test whether something is contained within a requirement? # If so how do we do that? Do we need to test against the _name_ of # the thing as well as the version? What about the markers? # TODO: Can we normalize the name and extra name? def __init__(self, requirement_string: str) -> None: try: parsed = _parse_requirement(requirement_string) except ParserSyntaxError as e: raise InvalidRequirement(str(e)) from e self.name: str = parsed.name if parsed.url: parsed_url = urllib.parse.urlparse(parsed.url) if parsed_url.scheme == "file": if urllib.parse.urlunparse(parsed_url) != parsed.url: raise InvalidRequirement("Invalid URL given") elif not (parsed_url.scheme and parsed_url.netloc) or ( not parsed_url.scheme and not parsed_url.netloc ): raise InvalidRequirement(f"Invalid URL: {parsed.url}") self.url: Optional[str] = parsed.url else: self.url = None self.extras: Set[str] = set(parsed.extras if parsed.extras else []) self.specifier: SpecifierSet = SpecifierSet(parsed.specifier) self.marker: Optional[Marker] = None if parsed.marker is not None: self.marker = Marker.__new__(Marker) self.marker._markers = _normalize_extra_values(parsed.marker) def __str__(self) -> str: parts: List[str] = [self.name] if self.extras: formatted_extras = ",".join(sorted(self.extras)) parts.append(f"[{formatted_extras}]") if self.specifier: parts.append(str(self.specifier)) if self.url: parts.append(f"@ {self.url}") if self.marker: parts.append(" ") if self.marker: parts.append(f"; {self.marker}") return "".join(parts) def __repr__(self) -> str: return f"<Requirement('{self}')>" def __hash__(self) -> int: return hash((self.__class__.__name__, str(self))) def __eq__(self, other: Any) -> bool: if not isinstance(other, Requirement): return NotImplemented return ( self.name == other.name and self.extras == other.extras and self.specifier == other.specifier and self.url == other.url and self.marker == other.marker )