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130 lines
4.3 KiB
130 lines
4.3 KiB
# This file is dual licensed under the terms of the Apache License, Version
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# 2.0, and the BSD License. See the LICENSE file in the root of this repository
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# for complete details.
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from __future__ import absolute_import, division, print_function
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import string
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import re
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from pyparsing import stringStart, stringEnd, originalTextFor, ParseException
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from pyparsing import ZeroOrMore, Word, Optional, Regex, Combine
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from pyparsing import Literal as L # noqa
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from six.moves.urllib import parse as urlparse
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from .markers import MARKER_EXPR, Marker
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from .specifiers import LegacySpecifier, Specifier, SpecifierSet
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class InvalidRequirement(ValueError):
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"""
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An invalid requirement was found, users should refer to PEP 508.
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"""
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ALPHANUM = Word(string.ascii_letters + string.digits)
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LBRACKET = L("[").suppress()
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RBRACKET = L("]").suppress()
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LPAREN = L("(").suppress()
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RPAREN = L(")").suppress()
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COMMA = L(",").suppress()
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SEMICOLON = L(";").suppress()
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AT = L("@").suppress()
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PUNCTUATION = Word("-_.")
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IDENTIFIER_END = ALPHANUM | (ZeroOrMore(PUNCTUATION) + ALPHANUM)
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IDENTIFIER = Combine(ALPHANUM + ZeroOrMore(IDENTIFIER_END))
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NAME = IDENTIFIER("name")
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EXTRA = IDENTIFIER
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URI = Regex(r'[^ ]+')("url")
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URL = (AT + URI)
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EXTRAS_LIST = EXTRA + ZeroOrMore(COMMA + EXTRA)
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EXTRAS = (LBRACKET + Optional(EXTRAS_LIST) + RBRACKET)("extras")
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VERSION_PEP440 = Regex(Specifier._regex_str, re.VERBOSE | re.IGNORECASE)
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VERSION_LEGACY = Regex(LegacySpecifier._regex_str, re.VERBOSE | re.IGNORECASE)
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VERSION_ONE = VERSION_PEP440 ^ VERSION_LEGACY
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VERSION_MANY = Combine(VERSION_ONE + ZeroOrMore(COMMA + VERSION_ONE),
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joinString=",", adjacent=False)("_raw_spec")
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_VERSION_SPEC = Optional(((LPAREN + VERSION_MANY + RPAREN) | VERSION_MANY))
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_VERSION_SPEC.setParseAction(lambda s, l, t: t._raw_spec or '')
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VERSION_SPEC = originalTextFor(_VERSION_SPEC)("specifier")
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VERSION_SPEC.setParseAction(lambda s, l, t: t[1])
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MARKER_EXPR = originalTextFor(MARKER_EXPR())("marker")
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MARKER_EXPR.setParseAction(
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lambda s, l, t: Marker(s[t._original_start:t._original_end])
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)
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MARKER_SEPARATOR = SEMICOLON
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MARKER = MARKER_SEPARATOR + MARKER_EXPR
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VERSION_AND_MARKER = VERSION_SPEC + Optional(MARKER)
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URL_AND_MARKER = URL + Optional(MARKER)
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NAMED_REQUIREMENT = \
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NAME + Optional(EXTRAS) + (URL_AND_MARKER | VERSION_AND_MARKER)
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REQUIREMENT = stringStart + NAMED_REQUIREMENT + stringEnd
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# pyparsing isn't thread safe during initialization, so we do it eagerly, see
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# issue #104
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REQUIREMENT.parseString("x[]")
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class Requirement(object):
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"""Parse a requirement.
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Parse a given requirement string into its parts, such as name, specifier,
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URL, and extras. Raises InvalidRequirement on a badly-formed requirement
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string.
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"""
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# TODO: Can we test whether something is contained within a requirement?
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# If so how do we do that? Do we need to test against the _name_ of
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# the thing as well as the version? What about the markers?
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# TODO: Can we normalize the name and extra name?
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def __init__(self, requirement_string):
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try:
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req = REQUIREMENT.parseString(requirement_string)
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except ParseException as e:
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raise InvalidRequirement("Parse error at \"{0!r}\": {1}".format(
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requirement_string[e.loc:e.loc + 8], e.msg
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))
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self.name = req.name
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if req.url:
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parsed_url = urlparse.urlparse(req.url)
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if not (parsed_url.scheme and parsed_url.netloc) or (
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not parsed_url.scheme and not parsed_url.netloc):
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raise InvalidRequirement("Invalid URL: {0}".format(req.url))
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self.url = req.url
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else:
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self.url = None
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self.extras = set(req.extras.asList() if req.extras else [])
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self.specifier = SpecifierSet(req.specifier)
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self.marker = req.marker if req.marker else None
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def __str__(self):
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parts = [self.name]
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if self.extras:
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parts.append("[{0}]".format(",".join(sorted(self.extras))))
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if self.specifier:
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parts.append(str(self.specifier))
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if self.url:
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parts.append("@ {0}".format(self.url))
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if self.marker:
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parts.append("; {0}".format(self.marker))
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return "".join(parts)
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def __repr__(self):
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return "<Requirement({0!r})>".format(str(self))
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