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from strictyaml.ruamel.comments import CommentedSeq, CommentedMap
from strictyaml.compound import FixedSeq, Map
from strictyaml.validators import Validator
from strictyaml.exceptions import YAMLSerializationError
from strictyaml.scalar import Bool, EmptyDict, EmptyList, Float, Int, Str
def schema_from_document(document):
if isinstance(document, CommentedMap):
return Map(
{key: schema_from_document(value) for key, value in document.items()}
)
elif isinstance(document, CommentedSeq):
return FixedSeq([schema_from_document(item) for item in document])
else:
return Str()
def schema_from_data(data, allow_empty):
if isinstance(data, dict):
if len(data) == 0:
if allow_empty:
return EmptyDict()
raise YAMLSerializationError(
"Empty dicts are not serializable to StrictYAML unless schema is used."
)
return Map(
{key: schema_from_data(value, allow_empty) for key, value in data.items()}
)
elif isinstance(data, list):
if len(data) == 0:
if allow_empty:
return EmptyList()
raise YAMLSerializationError(
"Empty lists are not serializable to StrictYAML unless schema is used."
)
return FixedSeq([schema_from_data(item, allow_empty) for item in data])
elif isinstance(data, bool):
return Bool()
elif isinstance(data, int):
return Int()
elif isinstance(data, float):
return Float()
else:
return Str()
class Any(Validator):
"""
Validates any YAML and returns simple dicts/lists of strings.
"""
def validate(self, chunk):
return schema_from_document(chunk.contents)(chunk)
def to_yaml(self, data, allow_empty=False):
"""
Args:
allow_empty (bool): True to allow EmptyDict and EmptyList in the
schema generated from the data.
"""
return schema_from_data(data, allow_empty=allow_empty).to_yaml(data)
@property
def key_validator(self):
return Str()
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