45 lines
1.1 KiB
Python
45 lines
1.1 KiB
Python
from __future__ import annotations
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from typing import TYPE_CHECKING
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from core.rule import Rule
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from sheerkarete.beta import BetaMemory
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from sheerkarete.common import ReteToken
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if TYPE_CHECKING: # pragma: no cover
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from typing import List
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from typing import Dict
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from typing import Any
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from sheerkarete.common import WME
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from sheerkarete.common import V
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class PNode(BetaMemory):
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"""
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A beta network node that stores the matches for productions.
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"""
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def __init__(self, rule: Rule, **kwargs):
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super(PNode, self).__init__(**kwargs)
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self.rules = [rule]
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self.new: List[ReteToken] = []
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def left_activation(self, token: ReteToken, wme: WME, binding: Dict[V, Any]):
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new_token = ReteToken(token, wme, node=self, binding=binding)
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self.items.append(new_token)
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self.new.append(new_token)
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def pop_new_token(self):
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if self.new:
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return self.new.pop()
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def new_activations(self):
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while self.new:
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t = self.new.pop()
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yield t
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@property
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def activations(self):
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for t in self.items:
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yield t
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