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# -*- coding: utf-8 -*-
# Copyright (C) 2012 The Python Software Foundation.
"""Implementation of the Metadata for Python packages PEPs.
Supports all metadata formats (1.0, 1.1, 1.2, and 2.0 experimental).
from __future__ import unicode_literals
import codecs
from email import message_from_file
import json
import logging
import re
from . import DistlibException, __version__
from .compat import StringIO, string_types, text_type
from .markers import interpret
from .util import extract_by_key
from .version import get_scheme, PEP426_VERSION_RE
logger = logging.getLogger(__name__)
class MetadataMissingError(DistlibException):
"""A required metadata is missing"""
class MetadataConflictError(DistlibException):
"""Attempt to read or write metadata fields that are conflictual."""
class MetadataUnrecognizedVersionError(DistlibException):
"""Unknown metadata version number."""
class MetadataInvalidError(DistlibException):
"""A metadata value is invalid"""
# public API of this module
# Encoding used for the PKG-INFO files
# preferred version. Hopefully will be changed
# to 1.2 once PEP 345 is supported everywhere
_LINE_PREFIX = re.compile('\n \|')
_241_FIELDS = ('Metadata-Version', 'Name', 'Version', 'Platform',
'Summary', 'Description',
'Keywords', 'Home-page', 'Author', 'Author-email',
_314_FIELDS = ('Metadata-Version', 'Name', 'Version', 'Platform',
'Supported-Platform', 'Summary', 'Description',
'Keywords', 'Home-page', 'Author', 'Author-email',
'License', 'Classifier', 'Download-URL', 'Obsoletes',
'Provides', 'Requires')
_314_MARKERS = ('Obsoletes', 'Provides', 'Requires', 'Classifier',
_345_FIELDS = ('Metadata-Version', 'Name', 'Version', 'Platform',
'Supported-Platform', 'Summary', 'Description',
'Keywords', 'Home-page', 'Author', 'Author-email',
'Maintainer', 'Maintainer-email', 'License',
'Classifier', 'Download-URL', 'Obsoletes-Dist',
'Project-URL', 'Provides-Dist', 'Requires-Dist',
'Requires-Python', 'Requires-External')
_345_MARKERS = ('Provides-Dist', 'Requires-Dist', 'Requires-Python',
'Obsoletes-Dist', 'Requires-External', 'Maintainer',
'Maintainer-email', 'Project-URL')
_426_FIELDS = ('Metadata-Version', 'Name', 'Version', 'Platform',
'Supported-Platform', 'Summary', 'Description',
'Keywords', 'Home-page', 'Author', 'Author-email',
'Maintainer', 'Maintainer-email', 'License',
'Classifier', 'Download-URL', 'Obsoletes-Dist',
'Project-URL', 'Provides-Dist', 'Requires-Dist',
'Requires-Python', 'Requires-External', 'Private-Version',
'Obsoleted-By', 'Setup-Requires-Dist', 'Extension',
_426_MARKERS = ('Private-Version', 'Provides-Extra', 'Obsoleted-By',
'Setup-Requires-Dist', 'Extension')
_ALL_FIELDS = set()
EXTRA_RE = re.compile(r'''extra\s*==\s*("([^"]+)"|'([^']+)')''')
def _version2fieldlist(version):
if version == '1.0':
return _241_FIELDS
elif version == '1.1':
return _314_FIELDS
elif version == '1.2':
return _345_FIELDS
elif version == '2.0':
return _426_FIELDS
raise MetadataUnrecognizedVersionError(version)
def _best_version(fields):
"""Detect the best version depending on the fields used."""
def _has_marker(keys, markers):
for marker in markers:
if marker in keys:
return True
return False
keys = []
for key, value in fields.items():
if value in ([], 'UNKNOWN', None):
possible_versions = ['1.0', '1.1', '1.2', '2.0']
# first let's try to see if a field is not part of one of the version
for key in keys:
if key not in _241_FIELDS and '1.0' in possible_versions:
if key not in _314_FIELDS and '1.1' in possible_versions:
if key not in _345_FIELDS and '1.2' in possible_versions:
if key not in _426_FIELDS and '2.0' in possible_versions:
# possible_version contains qualified versions
if len(possible_versions) == 1:
return possible_versions[0] # found !
elif len(possible_versions) == 0:
raise MetadataConflictError('Unknown metadata set')
# let's see if one unique marker is found
is_1_1 = '1.1' in possible_versions and _has_marker(keys, _314_MARKERS)
is_1_2 = '1.2' in possible_versions and _has_marker(keys, _345_MARKERS)
is_2_0 = '2.0' in possible_versions and _has_marker(keys, _426_MARKERS)
if int(is_1_1) + int(is_1_2) + int(is_2_0) > 1:
raise MetadataConflictError('You used incompatible 1.1/1.2/2.0 fields')
# we have the choice, 1.0, or 1.2, or 2.0
# - 1.0 has a broken Summary field but works with all tools
# - 1.1 is to avoid
# - 1.2 fixes Summary but has little adoption
# - 2.0 adds more features and is very new
if not is_1_1 and not is_1_2 and not is_2_0:
# we couldn't find any specific marker
if PKG_INFO_PREFERRED_VERSION in possible_versions:
if is_1_1:
return '1.1'
if is_1_2:
return '1.2'
return '2.0'
'metadata_version': 'Metadata-Version',
'name': 'Name',
'version': 'Version',
'platform': 'Platform',
'supported_platform': 'Supported-Platform',
'summary': 'Summary',
'description': 'Description',
'keywords': 'Keywords',
'home_page': 'Home-page',
'author': 'Author',
'author_email': 'Author-email',
'maintainer': 'Maintainer',
'maintainer_email': 'Maintainer-email',
'license': 'License',
'classifier': 'Classifier',
'download_url': 'Download-URL',
'obsoletes_dist': 'Obsoletes-Dist',
'provides_dist': 'Provides-Dist',
'requires_dist': 'Requires-Dist',
'setup_requires_dist': 'Setup-Requires-Dist',
'requires_python': 'Requires-Python',
'requires_external': 'Requires-External',
'requires': 'Requires',
'provides': 'Provides',
'obsoletes': 'Obsoletes',
'project_url': 'Project-URL',
'private_version': 'Private-Version',
'obsoleted_by': 'Obsoleted-By',
'extension': 'Extension',
'provides_extra': 'Provides-Extra',
_PREDICATE_FIELDS = ('Requires-Dist', 'Obsoletes-Dist', 'Provides-Dist')
_VERSIONS_FIELDS = ('Requires-Python',)
_VERSION_FIELDS = ('Version',)
_LISTFIELDS = ('Platform', 'Classifier', 'Obsoletes',
'Requires', 'Provides', 'Obsoletes-Dist',
'Provides-Dist', 'Requires-Dist', 'Requires-External',
'Project-URL', 'Supported-Platform', 'Setup-Requires-Dist',
'Provides-Extra', 'Extension')
_ELEMENTSFIELD = ('Keywords',)
_UNICODEFIELDS = ('Author', 'Maintainer', 'Summary', 'Description')
_MISSING = object()
_FILESAFE = re.compile('[^A-Za-z0-9.]+')
def _get_name_and_version(name, version, for_filename=False):
"""Return the distribution name with version.
If for_filename is true, return a filename-escaped form."""
if for_filename:
# For both name and version any runs of non-alphanumeric or '.'
# characters are replaced with a single '-'. Additionally any
# spaces in the version string become '.'
name = _FILESAFE.sub('-', name)
version = _FILESAFE.sub('-', version.replace(' ', '.'))
return '%s-%s' % (name, version)
class LegacyMetadata(object):
"""The legacy metadata of a release.
Supports versions 1.0, 1.1 and 1.2 (auto-detected). You can
instantiate the class with one of these arguments (or none):
- *path*, the path to a metadata file
- *fileobj* give a file-like object with metadata as content
- *mapping* is a dict-like object
- *scheme* is a version scheme name
# TODO document the mapping API and UNKNOWN default key
def __init__(self, path=None, fileobj=None, mapping=None,
if [path, fileobj, mapping].count(None) < 2:
raise TypeError('path, fileobj and mapping are exclusive')
self._fields = {}
self.requires_files = []
self._dependencies = None
self.scheme = scheme
if path is not None:
elif fileobj is not None:
elif mapping is not None:
def set_metadata_version(self):
self._fields['Metadata-Version'] = _best_version(self._fields)
def _write_field(self, fileobj, name, value):
fileobj.write('%s: %s\n' % (name, value))
def __getitem__(self, name):
return self.get(name)
def __setitem__(self, name, value):
return self.set(name, value)
def __delitem__(self, name):
field_name = self._convert_name(name)
del self._fields[field_name]
except KeyError:
raise KeyError(name)
def __contains__(self, name):
return (name in self._fields or
self._convert_name(name) in self._fields)
def _convert_name(self, name):
if name in _ALL_FIELDS:
return name
name = name.replace('-', '_').lower()
return _ATTR2FIELD.get(name, name)
def _default_value(self, name):
if name in _LISTFIELDS or name in _ELEMENTSFIELD:
return []
return 'UNKNOWN'
def _remove_line_prefix(self, value):
return _LINE_PREFIX.sub('\n', value)
def __getattr__(self, name):
if name in _ATTR2FIELD:
return self[name]
raise AttributeError(name)
# def _get_dependencies(self):
# def handle_req(req, rlist, extras):
# if ';' not in req:
# rlist.append(req)
# else:
# r, marker = req.split(';')
# m =
# if m:
# extra = m.groups()[0][1:-1]
# extras.setdefault(extra, []).append(r)
# result = self._dependencies
# if result is None:
# self._dependencies = result = {}
# extras = {}
# setup_reqs = self['Setup-Requires-Dist']
# if setup_reqs:
# result['setup'] = setup_reqs
# install_reqs = []
# for req in self['Requires-Dist']:
# handle_req(req, install_reqs, extras)
# if install_reqs:
# result['install'] = install_reqs
# if extras:
# result['extras'] = extras
# return result
# def _set_dependencies(self, value):
# if 'test' in value:
# value = dict(value) # don't change value passed in
# value.setdefault('extras', {})['test'] = value.pop('test')
# self._dependencies = value
# setup_reqs = value.get('setup', [])
# install_reqs = value.get('install', [])
# klist = []
# for k, rlist in value.get('extras', {}).items():
# klist.append(k)
# for r in rlist:
# install_reqs.append('%s; extra == "%s"' % (r, k))
# if setup_reqs:
# self['Setup-Requires-Dist'] = setup_reqs
# if install_reqs:
# self['Requires-Dist'] = install_reqs
# if klist:
# self['Provides-Extra'] = klist
# Public API
# dependencies = property(_get_dependencies, _set_dependencies)
def get_fullname(self, filesafe=False):
"""Return the distribution name with version.
If filesafe is true, return a filename-escaped form."""
return _get_name_and_version(self['Name'], self['Version'], filesafe)
def is_field(self, name):
"""return True if name is a valid metadata key"""
name = self._convert_name(name)
return name in _ALL_FIELDS
def is_multi_field(self, name):
name = self._convert_name(name)
return name in _LISTFIELDS
def read(self, filepath):
"""Read the metadata values from a file path."""
fp =, 'r', encoding='utf-8')
def read_file(self, fileob):
"""Read the metadata values from a file object."""
msg = message_from_file(fileob)
self._fields['Metadata-Version'] = msg['metadata-version']
# When reading, get all the fields we can
for field in _ALL_FIELDS:
if field not in msg:
if field in _LISTFIELDS:
# we can have multiple lines
values = msg.get_all(field)
if field in _LISTTUPLEFIELDS and values is not None:
values = [tuple(value.split(',')) for value in values]
self.set(field, values)
# single line
value = msg[field]
if value is not None and value != 'UNKNOWN':
self.set(field, value)
def write(self, filepath, skip_unknown=False):
"""Write the metadata fields to filepath."""
fp =, 'w', encoding='utf-8')
self.write_file(fp, skip_unknown)
def write_file(self, fileobject, skip_unknown=False):
"""Write the PKG-INFO format data to a file object."""
for field in _version2fieldlist(self['Metadata-Version']):
values = self.get(field)
if skip_unknown and values in ('UNKNOWN', [], ['UNKNOWN']):
if field in _ELEMENTSFIELD:
self._write_field(fileobject, field, ','.join(values))
if field not in _LISTFIELDS:
if field == 'Description':
values = values.replace('\n', '\n |')
values = [values]
values = [','.join(value) for value in values]
for value in values:
self._write_field(fileobject, field, value)
def update(self, other=None, **kwargs):
"""Set metadata values from the given iterable `other` and kwargs.
Behavior is like `dict.update`: If `other` has a ``keys`` method,
they are looped over and ``self[key]`` is assigned ``other[key]``.
Else, ``other`` is an iterable of ``(key, value)`` iterables.
Keys that don't match a metadata field or that have an empty value are
def _set(key, value):
if key in _ATTR2FIELD and value:
self.set(self._convert_name(key), value)
if not other:
# other is None or empty container
elif hasattr(other, 'keys'):
for k in other.keys():
_set(k, other[k])
for k, v in other:
_set(k, v)
if kwargs:
for k, v in kwargs.items():
_set(k, v)
def set(self, name, value):
"""Control then set a metadata field."""
name = self._convert_name(name)
if ((name in _ELEMENTSFIELD or name == 'Platform') and
not isinstance(value, (list, tuple))):
if isinstance(value, string_types):
value = [v.strip() for v in value.split(',')]
value = []
elif (name in _LISTFIELDS and
not isinstance(value, (list, tuple))):
if isinstance(value, string_types):
value = [value]
value = []
if logger.isEnabledFor(logging.WARNING):
project_name = self['Name']
scheme = get_scheme(self.scheme)
if name in _PREDICATE_FIELDS and value is not None:
for v in value:
# check that the values are valid
if not scheme.is_valid_matcher(v.split(';')[0]):
'%r: %r is not valid (field %r)',
project_name, v, name)
# FIXME this rejects UNKNOWN, is that right?
elif name in _VERSIONS_FIELDS and value is not None:
if not scheme.is_valid_constraint_list(value):
logger.warning('%r: %r is not a valid version (field %r)',
project_name, value, name)
elif name in _VERSION_FIELDS and value is not None:
if not scheme.is_valid_version(value):
logger.warning('%r: %r is not a valid version (field %r)',
project_name, value, name)
if name in _UNICODEFIELDS:
if name == 'Description':
value = self._remove_line_prefix(value)
self._fields[name] = value
def get(self, name, default=_MISSING):
"""Get a metadata field."""
name = self._convert_name(name)
if name not in self._fields:
if default is _MISSING:
default = self._default_value(name)
return default
if name in _UNICODEFIELDS:
value = self._fields[name]
return value
elif name in _LISTFIELDS:
value = self._fields[name]
if value is None:
return []
res = []
for val in value:
if name not in _LISTTUPLEFIELDS:
# That's for Project-URL
res.append((val[0], val[1]))
return res
elif name in _ELEMENTSFIELD:
value = self._fields[name]
if isinstance(value, string_types):
return value.split(',')
return self._fields[name]
def check(self, strict=False):
"""Check if the metadata is compliant. If strict is True then raise if
no Name or Version are provided"""
# XXX should check the versions (if the file was loaded)
missing, warnings = [], []
for attr in ('Name', 'Version'): # required by PEP 345
if attr not in self:
if strict and missing != []:
msg = 'missing required metadata: %s' % ', '.join(missing)
raise MetadataMissingError(msg)
for attr in ('Home-page', 'Author'):
if attr not in self:
# checking metadata 1.2 (XXX needs to check 1.1, 1.0)
if self['Metadata-Version'] != '1.2':
return missing, warnings
scheme = get_scheme(self.scheme)
def are_valid_constraints(value):
for v in value:
if not scheme.is_valid_matcher(v.split(';')[0]):
return False
return True
for fields, controller in ((_PREDICATE_FIELDS, are_valid_constraints),
for field in fields:
value = self.get(field, None)
if value is not None and not controller(value):
warnings.append('Wrong value for %r: %s' % (field, value))
return missing, warnings
def todict(self, skip_missing=False):
"""Return fields as a dict.
Field names will be converted to use the underscore-lowercase style
instead of hyphen-mixed case (i.e. home_page instead of Home-page).
mapping_1_0 = (
('metadata_version', 'Metadata-Version'),
('name', 'Name'),
('version', 'Version'),
('summary', 'Summary'),
('home_page', 'Home-page'),
('author', 'Author'),
('author_email', 'Author-email'),
('license', 'License'),
('description', 'Description'),
('keywords', 'Keywords'),
('platform', 'Platform'),
('classifier', 'Classifier'),
('download_url', 'Download-URL'),
data = {}
for key, field_name in mapping_1_0:
if not skip_missing or field_name in self._fields:
data[key] = self[field_name]
if self['Metadata-Version'] == '1.2':
mapping_1_2 = (
('requires_dist', 'Requires-Dist'),
('requires_python', 'Requires-Python'),
('requires_external', 'Requires-External'),
('provides_dist', 'Provides-Dist'),
('obsoletes_dist', 'Obsoletes-Dist'),
('project_url', 'Project-URL'),
('maintainer', 'Maintainer'),
('maintainer_email', 'Maintainer-email'),
for key, field_name in mapping_1_2:
if not skip_missing or field_name in self._fields:
if key != 'project_url':
data[key] = self[field_name]
data[key] = [','.join(u) for u in self[field_name]]
elif self['Metadata-Version'] == '1.1':
mapping_1_1 = (
('provides', 'Provides'),
('requires', 'Requires'),
('obsoletes', 'Obsoletes'),
for key, field_name in mapping_1_1:
if not skip_missing or field_name in self._fields:
data[key] = self[field_name]
return data
def add_requirements(self, requirements):
if self['Metadata-Version'] == '1.1':
# we can't have 1.1 metadata *and* Setuptools requires
for field in ('Obsoletes', 'Requires', 'Provides'):
if field in self:
del self[field]
self['Requires-Dist'] += requirements
# Mapping API
# TODO could add iter* variants
def keys(self):
return list(_version2fieldlist(self['Metadata-Version']))
def __iter__(self):
for key in self.keys():
yield key
def values(self):
return [self[key] for key in self.keys()]
def items(self):
return [(key, self[key]) for key in self.keys()]
def __repr__(self):
return '<%s %s %s>' % (self.__class__.__name__,,
METADATA_FILENAME = 'pydist.json'
class Metadata(object):
The metadata of a release. This implementation uses 2.0 (JSON)
metadata where possible. If not possible, it wraps a LegacyMetadata
instance which handles the key-value metadata format.
METADATA_VERSION_MATCHER = re.compile('^\d+(\.\d+)*$')
NAME_MATCHER = re.compile('^[0-9A-Z]([0-9A-Z_.-]*[0-9A-Z])?$', re.I)
SUMMARY_MATCHER = re.compile('.{1,2047}')
GENERATOR = 'distlib (%s)' % __version__
'name': (),
'version': (),
'summary': ('legacy',),
INDEX_KEYS = 'name version license summary description'
DEPENDENCY_KEYS = ('extras run_requires test_requires build_requires '
'dev_requires provides meta_requires obsoleted_by '
'metadata_version': (METADATA_VERSION_MATCHER, ()),
'name': (NAME_MATCHER, ('legacy',)),
'version': (VERSION_MATCHER, ('legacy',)),
'summary': (SUMMARY_MATCHER, ('legacy',)),
__slots__ = ('_legacy', '_data', 'scheme')
def __init__(self, path=None, fileobj=None, mapping=None,
if [path, fileobj, mapping].count(None) < 2:
raise TypeError('path, fileobj and mapping are exclusive')
self._legacy = None
self._data = None
self.scheme = scheme
#import pdb; pdb.set_trace()
if mapping is not None:
self._validate_mapping(mapping, scheme)
self._data = mapping
except MetadataUnrecognizedVersionError:
self._legacy = LegacyMetadata(mapping=mapping, scheme=scheme)
data = None
if path:
with open(path, 'rb') as f:
data =
elif fileobj:
data =
if data is None:
# Initialised with no args - to be added
self._data = {
'metadata_version': self.METADATA_VERSION,
'generator': self.GENERATOR,
if not isinstance(data, text_type):
data = data.decode('utf-8')
self._data = json.loads(data)
self._validate_mapping(self._data, scheme)
except ValueError:
# Note: MetadataUnrecognizedVersionError does not
# inherit from ValueError (it's a DistlibException,
# which should not inherit from ValueError).
# The ValueError comes from the json.load - if that
# succeeds and we get a validation error, we want
# that to propagate
self._legacy = LegacyMetadata(fileobj=StringIO(data),
common_keys = set(('name', 'version', 'license', 'keywords', 'summary'))
mapped_keys = {
'run_requires': ('Requires-Dist', list),
'build_requires': ('Setup-Requires-Dist', list),
'dev_requires': (None, list),
'test_requires': (None, list),
'meta_requires': (None, list),
'extras': ('Provides-Extra', list),
'classifiers': ('Classifier', list),
'source_url': ('Download-URL', None),
'metadata_version': ('Metadata-Version', None),
def __getattribute__(self, key):
common = object.__getattribute__(self, 'common_keys')
mapped = object.__getattribute__(self, 'mapped_keys')
if key in mapped:
lk, maker = mapped[key]
if self._legacy:
if lk is None:
result = None if maker is None else maker()
result = self._legacy.get(lk)
value = None if maker is None else maker()
result = self._data.setdefault(key, value)
elif key not in common:
result = object.__getattribute__(self, key)
elif self._legacy:
result = self._legacy.get(key)
result = self._data.get(key)
return result
def _validate_value(self, key, value, scheme=None):
if key in self.SYNTAX_VALIDATORS:
pattern, exclusions = self.SYNTAX_VALIDATORS[key]
if (scheme or self.scheme) not in exclusions:
m = pattern.match(value)
if not m:
raise MetadataInvalidError('%r is an invalid value for '
'the %r property' % (value,
def __setattr__(self, key, value):
self._validate_value(key, value)
common = object.__getattribute__(self, 'common_keys')
mapped = object.__getattribute__(self, 'mapped_keys')
if key in mapped:
lk, _ = mapped[key]
if self._legacy:
if lk is None:
raise NotImplementedError
self._legacy[lk] = value
self._data[key] = value
elif key not in common:
object.__setattr__(self, key, value)
if key == 'keywords':
if isinstance(value, string_types):
value = value.strip()
if value:
value = value.split()
value = []
if self._legacy:
self._legacy[key] = value
self._data[key] = value
def name_and_version(self):
return _get_name_and_version(, self.version, True)
def provides(self):
if self._legacy:
result = self._legacy['Provides-Dist']
result = self._data.setdefault('provides', [])
s = '%s (%s)' % (, self.version)
if s not in result:
return result
def provides(self, value):
if self._legacy:
self._legacy['Provides-Dist'] = value
self._data['provides'] = value
def get_requirements(self, reqts, extras=None, env=None):
Base method to get dependencies, given a set of extras
to satisfy and an optional environment context.
:param reqts: A list of sometimes-wanted dependencies,
perhaps dependent on extras and environment.
:param extras: A list of optional components being requested.
:param env: An optional environment for marker evaluation.
if self._legacy:
result = reqts
result = []
extras = set(extras or [])
for d in reqts:
if 'extra' not in d and 'environment' not in d:
# unconditional
include = True
if 'extra' not in d:
# Not extra-dependent - only environment-dependent
include = True
include = d.get('extra') in extras
if include:
# Not excluded because of extras, check environment
marker = d.get('environment')
if marker:
include = interpret(marker, env)
if include:
for key in ('build', 'dev', 'test'):
e = ':%s:' % key
if e in extras:
# A recursive call, but it should terminate since 'test'
# has been removed from the extras
reqts = self._data.get('%s_requires' % key, [])
result.extend(self.get_requirements(reqts, extras=extras,
return result
def dictionary(self):
if self._legacy:
return self._from_legacy()
return self._data
def dependencies(self):
if self._legacy:
raise NotImplementedError
return extract_by_key(self._data, self.DEPENDENCY_KEYS)
def dependencies(self, value):
if self._legacy:
raise NotImplementedError
def _validate_mapping(self, mapping, scheme):
if mapping.get('metadata_version') != self.METADATA_VERSION:
raise MetadataUnrecognizedVersionError()
missing = []
for key, exclusions in self.MANDATORY_KEYS.items():
if key not in mapping:
if scheme not in exclusions:
if missing:
msg = 'Missing metadata items: %s' % ', '.join(missing)
raise MetadataMissingError(msg)
for k, v in mapping.items():
self._validate_value(k, v, scheme)
def validate(self):
if self._legacy:
missing, warnings = self._legacy.check(True)
if missing or warnings:
logger.warning('Metadata: missing: %s, warnings: %s',
missing, warnings)
self._validate_mapping(self._data, self.scheme)
def todict(self):
if self._legacy:
return self._legacy.todict(True)
result = extract_by_key(self._data, self.INDEX_KEYS)
return result
def _from_legacy(self):
assert self._legacy and not self._data
result = {
'metadata_version': self.METADATA_VERSION,
'generator': self.GENERATOR,
lmd = self._legacy.todict(True) # skip missing ones
for k in ('name', 'version', 'license', 'summary', 'description',
if k in lmd:
if k == 'classifier':
nk = 'classifiers'
nk = k
result[nk] = lmd[k]
kw = lmd.get('Keywords', [])
if kw == ['']:
kw = []
result['keywords'] = kw
keys = (('requires_dist', 'run_requires'),
('setup_requires_dist', 'build_requires'))
for ok, nk in keys:
if ok in lmd and lmd[ok]:
result[nk] = [{'requires': lmd[ok]}]
result['provides'] = self.provides
author = {}
maintainer = {}
return result
'name': 'Name',
'version': 'Version',
'license': 'License',
'summary': 'Summary',
'description': 'Description',
'classifiers': 'Classifier',
def _to_legacy(self):
def process_entries(entries):
reqts = set()
for e in entries:
extra = e.get('extra')
env = e.get('environment')
rlist = e['requires']
for r in rlist:
if not env and not extra:
marker = ''
if extra:
marker = 'extra == "%s"' % extra
if env:
if marker:
marker = '(%s) and %s' % (env, marker)
marker = env
reqts.add(';'.join((r, marker)))
return reqts
assert self._data and not self._legacy
result = LegacyMetadata()
nmd = self._data
for nk, ok in self.LEGACY_MAPPING.items():
if nk in nmd:
result[ok] = nmd[nk]
r1 = process_entries(self.run_requires + self.meta_requires)
r2 = process_entries(self.build_requires + self.dev_requires)
if self.extras:
result['Provides-Extra'] = sorted(self.extras)
result['Requires-Dist'] = sorted(r1)
result['Setup-Requires-Dist'] = sorted(r2)
# TODO: other fields such as contacts
return result
def write(self, path=None, fileobj=None, legacy=False, skip_unknown=True):
if [path, fileobj].count(None) != 1:
raise ValueError('Exactly one of path and fileobj is needed')
if legacy:
if self._legacy:
legacy_md = self._legacy
legacy_md = self._to_legacy()
if path:
legacy_md.write(path, skip_unknown=skip_unknown)
legacy_md.write_file(fileobj, skip_unknown=skip_unknown)
if self._legacy:
d = self._from_legacy()
d = self._data
if fileobj:
json.dump(d, fileobj, ensure_ascii=True, indent=2)
with, 'w', 'utf-8') as f:
json.dump(d, f, ensure_ascii=True, indent=2)
def add_requirements(self, requirements):
if self._legacy:
self._data.setdefault('run_requires', []).extend(requirements)
def __repr__(self):
name = or '(no name)'
version = self.version or 'no version'
return '<%s %s %s (%s)>' % (self.__class__.__name__,
self.metadata_version, name, version)