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76 lines
2.6 KiB
Python
76 lines
2.6 KiB
Python
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"""
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Helpers for representing Stone data types in Python.
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This module should be dropped into a project that requires the use of Stone. In
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the future, this could be imported from a pre-installed Python package, rather
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than being added to a project.
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"""
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from __future__ import absolute_import, unicode_literals
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try:
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from . import stone_validators as bv
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except (SystemError, ValueError):
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# Catch errors raised when importing a relative module when not in a package.
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# This makes testing this file directly (outside of a package) easier.
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import stone_validators as bv # type: ignore
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_MYPY = False
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if _MYPY:
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import typing # noqa: F401 # pylint: disable=import-error,unused-import,useless-suppression
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class Union(object):
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# TODO(kelkabany): Possible optimization is to remove _value if a
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# union is composed of only symbols.
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__slots__ = ['_tag', '_value']
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_tagmap = {} # type: typing.Dict[typing.Text, bv.Validator]
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def __init__(self, tag, value=None):
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# type: (typing.Text, typing.Optional[typing.Any]) -> None
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assert tag in self._tagmap, 'Invalid tag %r.' % tag
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validator = self._tagmap[tag]
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if isinstance(validator, bv.Void):
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assert value is None, 'Void type union member must have None value.'
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elif isinstance(validator, (bv.Struct, bv.Union)):
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validator.validate_type_only(value)
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else:
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validator.validate(value)
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self._tag = tag
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self._value = value
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def __eq__(self, other):
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# Also need to check if one class is a subclass of another. If one union extends another,
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# the common fields should be able to be compared to each other.
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return (
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isinstance(other, Union) and
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(isinstance(self, other.__class__) or isinstance(other, self.__class__)) and
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self._tag == other._tag and self._value == other._value
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)
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def __ne__(self, other):
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return not self == other
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def __hash__(self):
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return hash((self._tag, self._value))
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class Route(object):
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def __init__(self, name, deprecated, arg_type, result_type, error_type, attrs):
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self.name = name
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self.deprecated = deprecated
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self.arg_type = arg_type
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self.result_type = result_type
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self.error_type = error_type
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assert isinstance(attrs, dict), 'Expected dict, got %r' % attrs
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self.attrs = attrs
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def __repr__(self):
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return 'Route({!r}, {!r}, {!r}, {!r}, {!r}, {!r})'.format(
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self.name,
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self.deprecated,
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self.arg_type,
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self.result_type,
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self.error_type,
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self.attrs)
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