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from typing import Pattern
from apischema.conversions.conversions import DefaultConversion
from apischema.types import AnyType
def infer_pattern(tp: AnyType, default_conversion: DefaultConversion) -> Pattern:
from apischema.json_schema.schema import DeserializationSchemaBuilder
try:
builder = DeserializationSchemaBuilder(
False, default_conversion, False, lambda r: r, {}
)
prop_schema = builder.visit(tp)
except RecursionError:
pass
else:
if (
len(prop_schema.get("patternProperties", {})) == 1
and "additionalProperties" not in prop_schema
):
return next(iter(prop_schema["patternProperties"]))
raise TypeError("Cannot inferred pattern from type schema") from None
|
