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requirements.py
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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 collections import namedtuple
from typing import List, Optional as TOptional, Set
from ._parser import parse_named_requirement
from ._tokenizer import ParseException
from .markers import InvalidMarker, Marker
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:
_RequirementTuple = namedtuple(
"_RequirementTuple", ["name", "url", "extras", "specifier", "marker"]
)
try:
req = _RequirementTuple(*parse_named_requirement(requirement_string))
except ParseException as e:
raise InvalidRequirement(str(e))
self.name: str = req.name
if req.url:
parsed_url = urllib.parse.urlparse(req.url)
if parsed_url.scheme == "file":
if urllib.parse.urlunparse(parsed_url) != req.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: {req.url}")
self.url: TOptional[str] = req.url
else:
self.url = None
self.extras: Set[str] = set(req.extras if req.extras else [])
self.specifier: SpecifierSet = SpecifierSet(req.specifier)
try:
self.marker: TOptional[Marker] = Marker(req.marker) if req.marker else None
except InvalidMarker as e:
raise InvalidRequirement(str(e))
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}')>"