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from email.parser import Parser
from pkginfo._compat import StringIO
from pkginfo._compat import must_decode
def parse(fp):
return Parser().parse(fp)
def get(msg, header):
return _collapse_leading_ws(header, msg.get(header))
def get_all(msg, header):
return [_collapse_leading_ws(header, x) for x in msg.get_all(header)]
def _collapse_leading_ws(header, txt):
"""
``Description`` header must preserve newlines; all others need not
"""
if header.lower() == 'description': # preserve newlines
return '\n'.join([x[8:] if x.startswith(' ' * 8) else x
for x in txt.strip().splitlines()])
else:
return ' '.join([x.strip() for x in txt.splitlines()])
HEADER_ATTRS_1_0 = ( # PEP 241
('Metadata-Version', 'metadata_version', False),
('Name', 'name', False),
('Version', 'version', False),
('Platform', 'platforms', True),
('Supported-Platform', 'supported_platforms', True),
('Summary', 'summary', False),
('Description', 'description', False),
('Keywords', 'keywords', False),
('Home-Page', 'home_page', False),
('Author', 'author', False),
('Author-email', 'author_email', False),
('License', 'license', False),
)
HEADER_ATTRS_1_1 = HEADER_ATTRS_1_0 + ( # PEP 314
('Classifier', 'classifiers', True),
('Download-URL', 'download_url', False),
('Requires', 'requires', True),
('Provides', 'provides', True),
('Obsoletes', 'obsoletes', True),
)
HEADER_ATTRS_1_2 = HEADER_ATTRS_1_1 + ( # PEP 345
('Maintainer', 'maintainer', False),
('Maintainer-email', 'maintainer_email', False),
('Requires-Python', 'requires_python', False),
('Requires-External', 'requires_external', True),
('Requires-Dist', 'requires_dist', True),
('Provides-Dist', 'provides_dist', True),
('Obsoletes-Dist', 'obsoletes_dist', True),
('Project-URL', 'project_urls', True),
)
HEADER_ATTRS_2_0 = HEADER_ATTRS_1_2 #XXX PEP 426?
HEADER_ATTRS = {
'1.0': HEADER_ATTRS_1_0,
'1.1': HEADER_ATTRS_1_1,
'1.2': HEADER_ATTRS_1_2,
'2.0': HEADER_ATTRS_2_0,
}
class Distribution(object):
metadata_version = None
# version 1.0
name = None
version = None
platforms = ()
supported_platforms = ()
summary = None
description = None
keywords = None
home_page = None
download_url = None
author = None
author_email = None
license = None
# version 1.1
classifiers = ()
requires = ()
provides = ()
obsoletes = ()
# version 1.2
maintainer = None
maintainer_email = None
requires_python = None
requires_external = ()
requires_dist = ()
provides_dist = ()
obsoletes_dist = ()
project_urls = ()
def extractMetadata(self):
data = self.read()
self.parse(data)
def read(self):
raise NotImplementedError
def _getHeaderAttrs(self):
return HEADER_ATTRS.get(self.metadata_version, [])
def parse(self, data):
fp = StringIO(must_decode(data))
msg = parse(fp)
if 'Metadata-Version' in msg and self.metadata_version is None:
value = get(msg, 'Metadata-Version')
metadata_version = self.metadata_version = value
for header_name, attr_name, multiple in self._getHeaderAttrs():
if attr_name == 'metadata_version':
continue
if header_name in msg:
if multiple:
values = get_all(msg, header_name)
setattr(self, attr_name, values)
else:
value = get(msg, header_name)
if value != 'UNKNOWN':
setattr(self, attr_name, value)
def __iter__(self):
for header_name, attr_name, multiple in self._getHeaderAttrs():
yield attr_name
iterkeys = __iter__