from __future__ import annotations
import sys
from collections import OrderedDict
from importlib.metadata import entry_points
importlib_metadata_version = ()
class PluginLoader:
_OPTIONS = None
_ENTRY_POINTS = None
@classmethod
def entry_points_for(cls, key):
if sys.version_info >= (3, 10) or importlib_metadata_version >= (3, 6):
return OrderedDict((e.name, e.load()) for e in cls.entry_points().select(group=key))
return OrderedDict((e.name, e.load()) for e in cls.entry_points().get(key, {}))
@staticmethod
def entry_points():
if PluginLoader._ENTRY_POINTS is None:
PluginLoader._ENTRY_POINTS = entry_points()
return PluginLoader._ENTRY_POINTS
class ComponentBuilder(PluginLoader):
def __init__(self, interpreter, parser, name, possible) -> None:
self.interpreter = interpreter
self.name = name
self._impl_class = None
self.possible = possible
self.parser = parser.add_argument_group(title=name)
self.add_selector_arg_parse(name, list(self.possible))
@classmethod
def options(cls, key):
if cls._OPTIONS is None:
cls._OPTIONS = cls.entry_points_for(key)
return cls._OPTIONS
def add_selector_arg_parse(self, name, choices):
raise NotImplementedError
def handle_selected_arg_parse(self, options):
selected = getattr(options, self.name)
if selected not in self.possible:
msg = f"No implementation for {self.interpreter}"
raise RuntimeError(msg)
self._impl_class = self.possible[selected]
self.populate_selected_argparse(selected, options.app_data)
return selected
def populate_selected_argparse(self, selected, app_data):
self.parser.description = f"options for {self.name} {selected}"
self._impl_class.add_parser_arguments(self.parser, self.interpreter, app_data)
def create(self, options):
return self._impl_class(options, self.interpreter)
__all__ = [
"ComponentBuilder",
"PluginLoader",
]
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