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Implementation of Parser API
Relies on the underlying registry of parsers to provide the best parsing plan
:param desired_type:
:param filesystem_object:
:param logger:
:param log_only_last: a flag to only log the last part of the file path (default False)
:return:
""""""
# find the parser for this object
t, combined_parser = self.build_parser_for_fileobject_and_desiredtype(filesystem_object, desired_type,
logger=logger)
# ask the parser for the parsing plan
return combined_parser.create_parsing_plan(t, filesystem_object, logger)"
500,"def build_parser_for_fileobject_and_desiredtype(self, obj_on_filesystem: PersistedObject, object_type: Type[T],
logger: Logger = None) -> Tuple[Type, Parser]:
""""""
Builds from the registry, a parser to parse object obj_on_filesystem as an object of type object_type.
To do that, it iterates through all registered parsers in the list in reverse order (last inserted first),
and checks if they support the provided object format (single or multifile) and type.
If several parsers match, it returns a cascadingparser that will try them in order.
If several alternatives are requested (through a root Union type), this is done independently for each
alternative.
:param obj_on_filesystem:
:param object_type:
:param logger:
:return: a type to use and a parser. The type to use is either directly the one provided, or a resolved one in
case of TypeVar
""""""
# First resolve TypeVars and Unions to get a list of compliant types
object_types = get_alternate_types_resolving_forwardref_union_and_typevar(object_type)
if len(object_types) == 1:
# One type: proceed as usual
parsers = self._build_parser_for_fileobject_and_desiredtype(obj_on_filesystem, object_typ=object_types[0],
logger=logger)
if len(parsers) > 1:
return object_types[0], CascadingParser(parsers)
else:
return next(iter(parsers.items()))
else:
# Several alternate types are supported: try to build a parser for each
parsers = OrderedDict()
errors = OrderedDict()
for typ in object_types:
try:
parsers.update(self._build_parser_for_fileobject_and_desiredtype(obj_on_filesystem, object_typ=typ,
logger=logger))
except NoParserFoundForObjectExt as e:
logger.warning(""{} - {}"".format(type(e).__name__, e))
errors[e] = e
except NoParserFoundForObjectType as f:
logger.warning(""{} - {}"".format(type(f).__name__, f))
errors[f] = f
# Combine if there are remaining, otherwise raise
if len(parsers) > 0:
return object_type, CascadingParser(parsers)
else:
raise NoParserFoundForUnionType.create(obj_on_filesystem, object_type, errors)"
501,"def _build_parser_for_fileobject_and_desiredtype(self, obj_on_filesystem: PersistedObject, object_typ: Type[T],
logger: Logger = None) -> Dict[Type, Parser]:
""""""
Builds a parser for each subtype of object_typ
:param obj_on_filesystem:
:param object_typ:
:param logger:
:return:
""""""
parsers = OrderedDict()
errors = OrderedDict()
try:
p = self.__build_parser_for_fileobject_and_desiredtype(obj_on_filesystem,
object_typ=object_typ,
logger=logger)
parsers[object_typ] = p
except NoParserFoundForObjectExt as e:
logger.warning(""{} - {}"".format(type(e).__name__, e))
errors[e] = e
except NoParserFoundForObjectType as f:
logger.warning(""{} - {}"".format(type(f).__name__, f))
errors[f] = f
# do not explore subclasses for collections
if is_collection(object_typ, strict=True):
if len(errors) > 0:
raise next(iter(errors.values()))
else:
return parsers
# Finally create one such parser for each subclass
subclasses = get_all_subclasses(object_typ)
# Then for each subclass also try (with a configurable limit in nb of subclasses)
for subclass in subclasses[0:GLOBAL_CONFIG.dict_to_object_subclass_limit]:
try: