38 lines
984 B
Python
38 lines
984 B
Python
from bu4.codes import CODE_NAME, CODE_NULL
|
|
from bu4.parsing.linked import Linked, LinkingState, Parsed
|
|
from bu4.linking.linkingfinished import LinkingFinished
|
|
from bu4.evaluation.aftervalue import envtype, Evaluable
|
|
|
|
|
|
__all__ = ('LName', 'PName',)
|
|
|
|
|
|
class LName(Linked):
|
|
def __init__(self, promise: set[bytes], name: bytes):
|
|
assert name in promise, f'undefined: {name}'
|
|
self.name = name
|
|
self.future = {name}
|
|
|
|
def link(self) -> LinkingState:
|
|
return LinkingFinished(self)
|
|
|
|
def evaluable(self, env: envtype) -> Evaluable:
|
|
return env[self.name]
|
|
|
|
def __str__(self):
|
|
return f'[{self.name.decode()}]'
|
|
|
|
def unlink(self) -> Parsed:
|
|
return PName(self.name)
|
|
|
|
|
|
class PName(Parsed):
|
|
def __init__(self, name: bytes):
|
|
self.name = name
|
|
|
|
def link(self, promise: set[bytes]) -> Linked:
|
|
return LName(promise, self.name)
|
|
|
|
def __bytes__(self):
|
|
return bytes([CODE_NAME, *self.name, CODE_NULL])
|