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import re
import sys
import __res
from importlib.abc import ResourceReader
from importlib.metadata import Distribution, DistributionFinder, PackageNotFoundError, Prepared
ResourceReader.register(__res._ResfsResourceReader)
METADATA_NAME = re.compile('^Name: (.*)$', re.MULTILINE)
class ArcadiaDistribution(Distribution):
def __init__(self, prefix):
self.prefix = prefix
def read_text(self, filename):
data = __res.resfs_read(f'{self.prefix}{filename}')
if data:
return data.decode('utf-8')
read_text.__doc__ = Distribution.read_text.__doc__
def locate_file(self, path):
return f'{self.prefix}{path}'
class ArcadiaMetadataFinder(DistributionFinder):
prefixes = {}
@classmethod
def find_distributions(cls, context=DistributionFinder.Context()):
found = cls._search_prefixes(context.name)
return map(ArcadiaDistribution, found)
@classmethod
def _init_prefixes(cls):
cls.prefixes.clear()
for resource in __res.resfs_files():
resource = resource.decode('utf-8')
if not resource.endswith('METADATA'):
continue
data = __res.resfs_read(resource).decode('utf-8')
metadata_name = METADATA_NAME.search(data)
if metadata_name:
metadata_name = Prepared(metadata_name.group(1))
cls.prefixes[metadata_name.normalized] = resource[:-len('METADATA')]
@classmethod
def _search_prefixes(cls, name):
if not cls.prefixes:
cls._init_prefixes()
if name:
try:
yield cls.prefixes[Prepared(name).normalized]
except KeyError:
raise PackageNotFoundError(name)
else:
for prefix in sorted(cls.prefixes.values()):
yield prefix
# monkeypatch standart library
import importlib.metadata
importlib.metadata.MetadataPathFinder = ArcadiaMetadataFinder
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