jit.py 文件源码

def inline(self, field, context):
        # type: (fields.Field, JitContext) -> Optional[str]
        """Generates a template for inlining boolean serialization.

        For example, generates:

        (
            (value in __some_field_truthy) or
            (False if value in __some_field_falsy else bool(value))
        )

        This is somewhat fragile but it tracks what Marshmallow does.
        """
        if is_overridden(field._serialize, fields.Boolean._serialize):
            return None
        truthy_symbol = '__{0}_truthy'.format(field.name)
        falsy_symbol = '__{0}_falsy'.format(field.name)
        context.namespace[truthy_symbol] = field.truthy
        context.namespace[falsy_symbol] = field.falsy
        result = ('(({0} in ' + truthy_symbol +
                  ') or (False if {0} in ' + falsy_symbol +
                  ' else dict()["error"]))')
        return result + ' if {0} is not None else None'