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"""Internal representation of type objects."""
from typing import NamedTuple, Optional, Sequence
class AbstractType(object):
"""Abstract base class for types."""
class ClassType(AbstractType):
"""A class type, potentially generic (int, List[str], None, ...)"""
def __init__(self, name, args=None):
# type: (str, Optional[Sequence[AbstractType]]) -> None
self.name = name
if args:
self.args = tuple(args)
else:
self.args = ()
def __repr__(self):
# type: () -> str
if self.name == 'Tuple' and len(self.args) == 1:
return 'Tuple[%s, ...]' % self.args[0]
elif self.args:
return '%s[%s]' % (self.name, ', '.join(str(arg) for arg in self.args))
else:
return self.name
def __eq__(self, other):
# type: (object) -> bool
return isinstance(other, ClassType) and self.name == other.name and self.args == other.args
def __hash__(self):
# type: () -> int
return hash((self.name, self.args))
class AnyType(AbstractType):
"""The type Any"""
def __repr__(self):
# type: () -> str
return 'Any'
def __eq__(self, other):
# type: (object) -> bool
return isinstance(other, AnyType)
def __hash__(self):
# type: () -> int
return hash('Any')
class NoReturnType(AbstractType):
"""The type mypy_extensions.NoReturn"""
def __repr__(self):
# type: () -> str
return 'mypy_extensions.NoReturn'
def __eq__(self, other):
# type: (object) -> bool
return isinstance(other, NoReturnType)
def __hash__(self):
# type: () -> int
return hash('NoReturn')
class TupleType(AbstractType):
"""Fixed-length tuple Tuple[x, ..., y]"""
def __init__(self, items):
# type: (Sequence[AbstractType]) -> None
self.items = tuple(items)
def __repr__(self):
# type: () -> str
if not self.items:
return 'Tuple[()]' # Special case
return 'Tuple[%s]' % ', '.join(str(item) for item in self.items)
def __eq__(self, other):
# type: (object) -> bool
return isinstance(other, TupleType) and self.items == other.items
def __hash__(self):
# type: () -> int
return hash(('tuple', self.items))
class UnionType(AbstractType):
"""Union[x, ..., y]"""
def __init__(self, items):
# type: (Sequence[AbstractType]) -> None
self.items = tuple(items)
def __repr__(self):
# type: () -> str
items = self.items
if len(items) == 2:
if is_none(items[0]):
return 'Optional[%s]' % items[1]
elif is_none(items[1]):
return 'Optional[%s]' % items[0]
return 'Union[%s]' % ', '.join(str(item) for item in items)
def __eq__(self, other):
# type: (object) -> bool
return isinstance(other, UnionType) and set(self.items) == set(other.items)
def __hash__(self):
# type: () -> int
return hash(('union', self.items))
# Argument kind
ARG_POS = 'ARG_POS' # Normal
ARG_STAR = 'ARG_STAR' # *args
ARG_STARSTAR = 'ARG_STARSTAR' # **kwargs
# Description of an argument in a signature. The kind is one of ARG_*.
Argument = NamedTuple('Argument', [('type', AbstractType), ('kind', str)])
def is_none(t):
# type: (AbstractType) -> bool
return isinstance(t, ClassType) and t.name == 'None'
def is_optional(t):
# type: (AbstractType) -> bool
return (isinstance(t, UnionType)
and len(t.items) == 2
and any(item == ClassType('None') for item in t.items))
|
