Edit File: requirement.py
from __future__ import unicode_literals import re from pkg_resources import Requirement as Req from .fragment import get_hash_info, parse_fragment, parse_extras_require from .vcs import VCS, VCS_SCHEMES URI_REGEX = re.compile( r'^(?P<scheme>https?|file|ftps?)://(?P<path>[^#]+)' r'(#(?P<fragment>\S+))?' ) VCS_REGEX = re.compile( r'^(?P<scheme>{0})://'.format(r'|'.join( [scheme.replace('+', r'\+') for scheme in VCS_SCHEMES])) + r'((?P<login>[^/@]+)@)?' r'(?P<path>[^#@]+)' r'(@(?P<revision>[^#]+))?' r'(#(?P<fragment>\S+))?' ) # This matches just about everyting LOCAL_REGEX = re.compile( r'^((?P<scheme>file)://)?' r'(?P<path>[^#]+)' + r'(#(?P<fragment>\S+))?' ) NAME_EQ_REGEX = re.compile(r'name="(\S+)"') PER_REQ_PARAM_REGEX = re.compile(r'\s*--[a-z-]+=\S+') EDITABLE_REGEX = re.compile(r'^(-e|--editable=?)\s*') class Requirement(object): """ Represents a single requirement Typically instances of this class are created with ``Requirement.parse``. For local file requirements, there's no verification that the file exists. This class attempts to be *dict-like*. See: http://www.pip-installer.org/en/latest/logic.html **Members**: * ``line`` - the actual requirement line being parsed * ``editable`` - a boolean whether this requirement is "editable" * ``local_file`` - a boolean whether this requirement is a local file/path * ``specifier`` - a boolean whether this requirement used a requirement specifier (eg. "django>=1.5" or "requirements") * ``vcs`` - a string specifying the version control system * ``revision`` - a version control system specifier * ``name`` - the name of the requirement * ``uri`` - the URI if this requirement was specified by URI * ``subdirectory`` - the subdirectory fragment of the URI * ``path`` - the local path to the requirement * ``hash_name`` - the type of hashing algorithm indicated in the line * ``hash`` - the hash value indicated by the requirement line * ``extras`` - a list of extras for this requirement (eg. "mymodule[extra1, extra2]") * ``specs`` - a list of specs for this requirement (eg. "mymodule>1.5,<1.6" => [('>', '1.5'), ('<', '1.6')]) * ``provenance`` - a tuple of (file_name, start_line, end_line), line numbers are 1-based """ def __init__(self, line): # Do not call this private method self.line = line self.editable = False self.local_file = False self.specifier = False self.vcs = None self.name = None self.subdirectory = None self.uri = None self.path = None self.revision = None self.hash_name = None self.hash = None self.extras = [] self.specs = [] self.provenance = None def __repr__(self): return '<Requirement: "{0}">'.format(self.line) def __getitem__(self, key): return getattr(self, key) def keys(self): return self.__dict__.keys() @classmethod def parse_editable(cls, line): """ Parses a Requirement from an "editable" requirement which is either a local project path or a VCS project URI. See: pip/req.py:from_editable() :param line: an "editable" requirement :returns: a Requirement instance for the given line :raises: ValueError on an invalid requirement """ req = cls('-e {0}'.format(line)) req.editable = True vcs_match = VCS_REGEX.match(line) local_match = LOCAL_REGEX.match(line) if vcs_match is not None: groups = vcs_match.groupdict() if groups.get('login'): req.uri = '{scheme}://{login}@{path}'.format(**groups) else: req.uri = '{scheme}://{path}'.format(**groups) req.revision = groups['revision'] if groups['fragment']: fragment = parse_fragment(groups['fragment']) egg = fragment.get('egg') req.name, req.extras = parse_extras_require(egg) req.hash_name, req.hash = get_hash_info(fragment) req.subdirectory = fragment.get('subdirectory') for vcs in VCS: if req.uri.startswith(vcs): req.vcs = vcs else: assert local_match is not None, 'This should match everything' groups = local_match.groupdict() req.local_file = True if groups['fragment']: fragment = parse_fragment(groups['fragment']) egg = fragment.get('egg') req.name, req.extras = parse_extras_require(egg) req.hash_name, req.hash = get_hash_info(fragment) req.subdirectory = fragment.get('subdirectory') req.path = groups['path'] return req @classmethod def parse_line(cls, line): """ Parses a Requirement from a non-editable requirement. See: pip/req.py:from_line() :param line: a "non-editable" requirement :returns: a Requirement instance for the given line :raises: ValueError on an invalid requirement """ req = cls(line) vcs_match = VCS_REGEX.match(line) uri_match = URI_REGEX.match(line) local_match = LOCAL_REGEX.match(line) if vcs_match is not None: groups = vcs_match.groupdict() if groups.get('login'): req.uri = '{scheme}://{login}@{path}'.format(**groups) else: req.uri = '{scheme}://{path}'.format(**groups) req.revision = groups['revision'] if groups['fragment']: fragment = parse_fragment(groups['fragment']) egg = fragment.get('egg') req.name, req.extras = parse_extras_require(egg) req.hash_name, req.hash = get_hash_info(fragment) req.subdirectory = fragment.get('subdirectory') for vcs in VCS: if req.uri.startswith(vcs): req.vcs = vcs elif uri_match is not None: groups = uri_match.groupdict() req.uri = '{scheme}://{path}'.format(**groups) if groups['fragment']: fragment = parse_fragment(groups['fragment']) egg = fragment.get('egg') req.name, req.extras = parse_extras_require(egg) req.hash_name, req.hash = get_hash_info(fragment) req.subdirectory = fragment.get('subdirectory') if groups['scheme'] == 'file': req.local_file = True elif '#egg=' in line: # Assume a local file match assert local_match is not None, 'This should match everything' groups = local_match.groupdict() req.local_file = True if groups['fragment']: fragment = parse_fragment(groups['fragment']) egg = fragment.get('egg') name, extras = parse_extras_require(egg) req.name = fragment.get('egg') req.hash_name, req.hash = get_hash_info(fragment) req.subdirectory = fragment.get('subdirectory') req.path = groups['path'] elif line.startswith('./'): setup_file = open(line + "/setup.py", "r") setup_content = setup_file.read() name_search = NAME_EQ_REGEX.search(setup_content) if name_search: req.name = name_search.group(1) req.local_file = True else: # This is a requirement specifier. # Delegate to pkg_resources and hope for the best req.specifier = True # an optional per-requirement param is not part of the req specifier # see https://pip.pypa.io/en/stable/reference/pip_install/#per-requirement-overrides # and https://pip.pypa.io/en/stable/reference/pip_install/#hash-checking-mode line = PER_REQ_PARAM_REGEX.sub('', line) pkg_req = Req.parse(line) req.name = pkg_req.unsafe_name req.extras = list(pkg_req.extras) req.specs = pkg_req.specs return req @classmethod def parse(cls, line): """ Parses a Requirement from a line of a requirement file. :param line: a line of a requirement file :returns: a Requirement instance for the given line :raises: ValueError on an invalid requirement """ if line.startswith('-e') or line.startswith('--editable'): # Editable installs are either a local project path # or a VCS project URI return cls.parse_editable( EDITABLE_REGEX.sub('', line)) return cls.parse_line(line)
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