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An HTN (https://en.wikipedia.org/wiki/Hierarchical_task_network) is similar to a decision tree, but it is able to reset to an earlier stage if a subtask fails and tasks are able to account for the changes in world state caused by earlier tasks. Currently this just uses exactly the same strategy as before so we can prove the system, but it should make it simpler to improve on task planning.
28 lines
1.6 KiB
Python
28 lines
1.6 KiB
Python
from collections import Iterator
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from game.commander.tasks.primitive.antishipping import PlanAntiShipping
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from game.commander.tasks.primitive.convoyinterdiction import PlanConvoyInterdiction
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from game.commander.theaterstate import TheaterState
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from game.htn import CompoundTask, Method
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class InterdictReinforcements(CompoundTask[TheaterState]):
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def each_valid_method(self, state: TheaterState) -> Iterator[Method[TheaterState]]:
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# These will only rarely get planned. When a convoy is travelling multiple legs,
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# they're targetable after the first leg. The reason for this is that
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# procurement happens *after* mission planning so that the missions that could
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# not be filled will guide the procurement process. Procurement is the stage
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# that convoys are created (because they're created to move ground units that
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# were just purchased), so we haven't created any yet. Any incomplete transfers
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# from the previous turn (multi-leg journeys) will still be present though so
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# they can be targeted.
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#
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# Even after this is fixed, the player's convoys that were created through the
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# UI will never be targeted on the first turn of their journey because the AI
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# stops planning after the start of the turn. We could potentially fix this by
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# moving opfor mission planning until the takeoff button is pushed.
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for convoy in state.enemy_convoys:
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yield [PlanConvoyInterdiction(convoy)]
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for ship in state.enemy_shipping:
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yield [PlanAntiShipping(ship)]
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