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"""Types and utility functions used by various other internal tools.""" from __future__ import annotations from typing import TYPE_CHECKING, Any, Callable from pydantic_core import core_schema from typing_extensions import Literal from ..annotated_handlers import GetCoreSchemaHandler, GetJsonSchemaHandler if TYPE_CHECKING: from ..json_schema import GenerateJsonSchema, JsonSchemaValue from ._core_utils import CoreSchemaOrField from ._generate_schema import GenerateSchema GetJsonSchemaFunction = Callable[[CoreSchemaOrField, GetJsonSchemaHandler], JsonSchemaValue] HandlerOverride = Callable[[CoreSchemaOrField], JsonSchemaValue] class GenerateJsonSchemaHandler(GetJsonSchemaHandler): """JsonSchemaHandler implementation that doesn't do ref unwrapping by default. This is used for any Annotated metadata so that we don't end up with conflicting modifications to the definition schema. Used internally by Pydantic, please do not rely on this implementation. See `GetJsonSchemaHandler` for the handler API. """ def __init__(self, generate_json_schema: GenerateJsonSchema, handler_override: HandlerOverride \| None) -> None: self.generate_json_schema = generate_json_schema self.handler = handler_override or generate_json_schema.generate_inner self.mode = generate_json_schema.mode def __call__(self, core_schema: CoreSchemaOrField, /) -> JsonSchemaValue: return self.handler(core_schema) def resolve_ref_schema(self, maybe_ref_json_schema: JsonSchemaValue) -> JsonSchemaValue: """Resolves `$ref` in the json schema. This returns the input json schema if there is no `$ref` in json schema. Args: maybe_ref_json_schema: The input json schema that may contains `$ref`. Returns: Resolved json schema. Raises: LookupError: If it can't find the definition for `$ref`. """ if '$ref' not in maybe_ref_json_schema: return maybe_ref_json_schema ref = maybe_ref_json_schema['$ref'] json_schema = self.generate_json_schema.get_schema_from_definitions(ref) if json_schema is None: raise LookupError( f'Could not find a ref for {ref}.' ' Maybe you tried to call resolve_ref_schema from within a recursive model?' ) return json_schema class CallbackGetCoreSchemaHandler(GetCoreSchemaHandler): """Wrapper to use an arbitrary function as a `GetCoreSchemaHandler`. Used internally by Pydantic, please do not rely on this implementation. See `GetCoreSchemaHandler` for the handler API. """ def __init__( self, handler: Callable[[Any], core_schema.CoreSchema], generate_schema: GenerateSchema, ref_mode: Literal['to-def', 'unpack'] = 'to-def', ) -> None: self._handler = handler self._generate_schema = generate_schema self._ref_mode = ref_mode def __call__(self, source_type: Any, /) -> core_schema.CoreSchema: schema = self._handler(source_type) ref = schema.get('ref') if self._ref_mode == 'to-def': if ref is not None: self._generate_schema.defs.definitions[ref] = schema return core_schema.definition_reference_schema(ref) return schema else: # ref_mode = 'unpack return self.resolve_ref_schema(schema) def _get_types_namespace(self) -> dict[str, Any] \| None: return self._generate_schema._types_namespace def generate_schema(self, source_type: Any, /) -> core_schema.CoreSchema: return self._generate_schema.generate_schema(source_type) @property def field_name(self) -> str \| None: return self._generate_schema.field_name_stack.get() def resolve_ref_schema(self, maybe_ref_schema: core_schema.CoreSchema) -> core_schema.CoreSchema: """Resolves reference in the core schema. Args: maybe_ref_schema: The input core schema that may contains reference. Returns: Resolved core schema. Raises: LookupError: If it can't find the definition for reference. """ if maybe_ref_schema['type'] == 'definition-ref': ref = maybe_ref_schema['schema_ref'] if ref not in self._generate_schema.defs.definitions: raise LookupError( f'Could not find a ref for {ref}.' ' Maybe you tried to call resolve_ref_schema from within a recursive model?' ) return self._generate_schema.defs.definitions[ref] elif maybe_ref_schema['type'] == 'definitions': return self.resolve_ref_schema(maybe_ref_schema['schema']) return maybe_ref_schema