def _traverse_element_cls(self, element_cls):
try:
if not issubclass(element_cls, elements.Element):
raise exceptions.DSLParsingSchemaAPIException(1)
except TypeError:
raise exceptions.DSLParsingSchemaAPIException(1)
self._traverse_schema(element_cls.schema)
def _validate_leaf_type(self, schema_type):
"""Check that schema_type is valid for typechecking
schema_type needs to be something that can go into
isinstance() checks, ie. a class, type, or tuple of classes
and types.
Additionally, an empty schema is not allowed.
"""
if not schema_type:
raise exceptions.DSLParsingSchemaAPIException(1)
try:
isinstance(None, schema_type)
except TypeError:
raise exceptions.DSLParsingSchemaAPIException(1)
def _traverse_schema(self, schema, list_nesting=0):
if isinstance(schema, dict):
for key, value in schema.items():
if not isinstance(key, basestring):
raise exceptions.DSLParsingSchemaAPIException(1)
self._traverse_element_cls(value)
elif isinstance(schema, list):
if list_nesting > 0:
raise exceptions.DSLParsingSchemaAPIException(1)
if len(schema) == 0:
raise exceptions.DSLParsingSchemaAPIException(1)
for value in schema:
self._traverse_schema(value, list_nesting+1)
elif isinstance(schema, elements.ElementType):
if isinstance(schema, elements.Leaf):
if not isinstance(schema.type, (type, list, tuple)):
raise exceptions.DSLParsingSchemaAPIException(1)
if (isinstance(schema.type, (list, tuple)) and
(not schema.type or
not all([isinstance(i, type) for i in schema.type]))):
raise exceptions.DSLParsingSchemaAPIException(1)
elif isinstance(schema, elements.Dict):
self._traverse_element_cls(schema.type)
elif isinstance(schema, elements.List):
self._traverse_element_cls(schema.type)
else:
raise exceptions.DSLParsingSchemaAPIException(1)
else:
raise exceptions.DSLParsingSchemaAPIException(1)
def _traverse_schema(self, schema, list_nesting=0):
if isinstance(schema, dict):
for key, value in schema.items():
if not isinstance(key, text_type):
raise exceptions.DSLParsingSchemaAPIException(1)
self._traverse_element_cls(value)
elif isinstance(schema, list):
if list_nesting > 0:
raise exceptions.DSLParsingSchemaAPIException(1)
if len(schema) == 0:
raise exceptions.DSLParsingSchemaAPIException(1)
for value in schema:
self._traverse_schema(value, list_nesting + 1)
elif isinstance(schema, elements.ElementType):
if isinstance(schema, elements.Leaf):
self._validate_leaf_type(schema.type)
elif isinstance(schema, elements.Dict):
self._traverse_element_cls(schema.type)
elif isinstance(schema, elements.List):
self._traverse_element_cls(schema.type)
else:
raise exceptions.DSLParsingSchemaAPIException(1)
else:
raise exceptions.DSLParsingSchemaAPIException(1)
def value(self):
if self._parsed_value == UNPARSED:
raise exceptions.DSLParsingSchemaAPIException(
exceptions.ERROR_CODE_ILLEGAL_VALUE_ACCESS,
'Cannot access element value before parsing')
return copy.deepcopy(self._parsed_value)
