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# Copyright (C) 2019-2020 Intel Corporation
#
# SPDX-License-Identifier: MIT
import yaml
class Schema:
class Item:
def __init__(self, ctor, internal=False):
self.ctor = ctor
self.internal = internal
def __call__(self, *args, **kwargs):
return self.ctor(*args, **kwargs)
def __init__(self, items=None, fallback=None):
self._items = {}
if items is not None:
self._items.update(items)
self._fallback = fallback
def _get_items(self, allow_fallback=True):
all_items = {}
if allow_fallback and self._fallback is not None:
all_items.update(self._fallback)
all_items.update(self._items)
return all_items
def items(self, allow_fallback=True):
return self._get_items(allow_fallback=allow_fallback).items()
def keys(self, allow_fallback=True):
return self._get_items(allow_fallback=allow_fallback).keys()
def values(self, allow_fallback=True):
return self._get_items(allow_fallback=allow_fallback).values()
def __contains__(self, key):
return key in self.keys()
def __len__(self):
return len(self._get_items())
def __iter__(self):
return iter(self._get_items())
def __getitem__(self, key):
default = object()
value = self.get(key, default=default)
if value is default:
raise KeyError('Key "%s" does not exist' % (key))
return value
def get(self, key, default=None):
found = self._items.get(key, default)
if found is not default:
return found
if self._fallback is not None:
return self._fallback.get(key, default)
class SchemaBuilder:
def __init__(self):
self._items = {}
def add(self, name, ctor=str, internal=False):
if name in self._items:
raise KeyError('Key "%s" already exists' % (name))
self._items[name] = Schema.Item(ctor, internal=internal)
return self
def build(self):
return Schema(self._items)
class Config:
def __init__(self, config=None, fallback=None, schema=None, mutable=True):
# schema should be established first
self.__dict__['_schema'] = schema
self.__dict__['_mutable'] = True
self.__dict__['_config'] = {}
if fallback is not None:
for k, v in fallback.items(allow_fallback=False):
self.set(k, v)
if config is not None:
self.update(config)
self.__dict__['_mutable'] = mutable
def _items(self, allow_fallback=True, allow_internal=True):
all_config = {}
if allow_fallback and self._schema is not None:
for key, item in self._schema.items():
all_config[key] = item()
all_config.update(self._config)
if not allow_internal and self._schema is not None:
for key, item in self._schema.items():
if item.internal:
all_config.pop(key)
return all_config
def items(self, allow_fallback=True, allow_internal=True):
return self._items(
allow_fallback=allow_fallback,
allow_internal=allow_internal
).items()
def keys(self, allow_fallback=True, allow_internal=True):
return self._items(
allow_fallback=allow_fallback,
allow_internal=allow_internal
).keys()
def values(self, allow_fallback=True, allow_internal=True):
return self._items(
allow_fallback=allow_fallback,
allow_internal=allow_internal
).values()
def __contains__(self, key):
return key in self.keys()
def __len__(self):
return len(self.items())
def __iter__(self):
return iter(self.keys())
def __getitem__(self, key):
default = object()
value = self.get(key, default=default)
if value is default:
raise KeyError('Key "%s" does not exist' % (key))
return value
def __setitem__(self, key, value):
return self.set(key, value)
def __getattr__(self, key):
return self.get(key)
def __setattr__(self, key, value):
return self.set(key, value)
def __eq__(self, other):
try:
for k, my_v in self.items(allow_internal=False):
other_v = other[k]
if my_v != other_v:
return False
return True
except Exception:
return False
def update(self, other):
for k, v in other.items():
self.set(k, v)
def remove(self, key):
if not self._mutable:
raise Exception("Cannot set value of immutable object")
self._config.pop(key, None)
def get(self, key, default=None):
found = self._config.get(key, default)
if found is not default:
return found
if self._schema is not None:
found = self._schema.get(key, default)
if found is not default:
# ignore mutability
found = found()
self._config[key] = found
return found
return found
def set(self, key, value):
if not self._mutable:
raise Exception("Cannot set value of immutable object")
if self._schema is not None:
if key not in self._schema:
raise Exception("Can not set key '%s' - schema mismatch" % (key))
schema_entry = self._schema[key]
schema_entry_instance = schema_entry()
if not isinstance(value, type(schema_entry_instance)):
if isinstance(value, dict) and \
isinstance(schema_entry_instance, Config):
schema_entry_instance.update(value)
value = schema_entry_instance
else:
raise Exception("Can not set key '%s' - schema mismatch" % (key))
self._config[key] = value
return value
@staticmethod
def parse(path):
with open(path, 'r') as f:
return Config(yaml.safe_load(f))
@staticmethod
def yaml_representer(dumper, value):
return dumper.represent_data(
value._items(allow_internal=False, allow_fallback=False))
def dump(self, path):
with open(path, 'w+') as f:
yaml.dump(self, f)
yaml.add_multi_representer(Config, Config.yaml_representer)
class DefaultConfig(Config):
def __init__(self, default=None):
super().__init__()
self.__dict__['_default'] = default
def set(self, key, value):
if key not in self.keys(allow_fallback=False):
value = self._default(value)
return super().set(key, value)
else:
return super().set(key, value)
DEFAULT_FORMAT = 'datumaro' |