mirror of
https://github.com/wpilibsuite/allwpilib
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[robotpy] Mirror robotpy's commands-v2 (#8369)
Project import generated by Copybara. GitOrigin-RevId: 715c8e8372d936f447f2937aab6b1a22dc619126
This commit is contained in:
PJ Reiniger
588
commandsv2/src/main/python/commands2/command.py
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588
commandsv2/src/main/python/commands2/command.py
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@@ -0,0 +1,588 @@
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# validated: 2024-01-20 DS f29a7d2e501b Command.java
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# Don't import stuff from the package here, it'll cause a circular import
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from __future__ import annotations
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from enum import Enum
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from typing import TYPE_CHECKING, Any, Callable, Set, Union
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from typing_extensions import Self, TypeAlias
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if TYPE_CHECKING:
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from .instantcommand import InstantCommand
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from .subsystem import Subsystem
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from .parallelracegroup import ParallelRaceGroup
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from .sequentialcommandgroup import SequentialCommandGroup
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from .paralleldeadlinegroup import ParallelDeadlineGroup
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from .parallelcommandgroup import ParallelCommandGroup
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from .repeatcommand import RepeatCommand
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from .proxycommand import ProxyCommand
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from .conditionalcommand import ConditionalCommand
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from .wrappercommand import WrapperCommand
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from wpiutil import Sendable, SendableRegistry, SendableBuilder
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class InterruptionBehavior(Enum):
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"""
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An enum describing the command's behavior when another command with a shared requirement is
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scheduled.
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"""
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kCancelIncoming = 0
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"""
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This command ends, :func:`commands2.Command.end` is called, and the incoming command is
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scheduled normally.
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This is the default behavior.
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"""
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kCancelSelf = 1
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""" This command continues, and the incoming command is not scheduled."""
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class Command(Sendable):
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"""
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A state machine representing a complete action to be performed by the robot. Commands are run by
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the :class:`commands2.CommandScheduler`, and can be composed into CommandGroups to allow users to build
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complicated multistep actions without the need to roll the state machine logic themselves.
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Commands are run synchronously from the main robot loop; no multithreading is used, unless
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specified explicitly from the command implementation.
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"""
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InterruptionBehavior: TypeAlias = (
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InterruptionBehavior # type alias for 2023 location
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)
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requirements: Set[Subsystem]
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def __new__(cls, *args, **kwargs) -> Self:
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instance = super().__new__(
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cls,
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)
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super().__init__(instance)
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SendableRegistry.add(instance, cls.__name__)
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instance.requirements = set()
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return instance
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def __init__(self):
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pass
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def initialize(self):
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"""The initial subroutine of a command. Called once when the command is initially scheduled."""
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pass
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def execute(self):
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"""The main body of a command. Called repeatedly while the command is scheduled."""
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pass
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def end(self, interrupted: bool):
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"""
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The action to take when the command ends. Called when either the command finishes normally, or
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when it interrupted/canceled.
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Do not schedule commands here that share requirements with this command. Use :meth:`.andThen` instead.
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:param interrupted: whether the command was interrupted/canceled
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"""
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pass
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def isFinished(self) -> bool:
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"""
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Whether the command has finished. Once a command finishes, the scheduler will call its :meth:`commands2.Command.end`
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method and un-schedule it.
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:returns: whether the command has finished.
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"""
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return False
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def getRequirements(self) -> Set[Subsystem]:
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"""
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Specifies the set of subsystems used by this command. Two commands cannot use the same
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subsystem at the same time. If another command is scheduled that shares a requirement, :meth:`.getInterruptionBehavior` will be checked and followed. If no subsystems are required, return
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an empty set.
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.. note:: it is recommended that user implementations contain the requirements as a field, and
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return that field here, rather than allocating a new set every time this is called.
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:returns: the set of subsystems that are required
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"""
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return self.requirements
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def addRequirements(self, *requirements: Subsystem):
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"""
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Adds the specified subsystems to the requirements of the command. The scheduler will prevent
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two commands that require the same subsystem from being scheduled simultaneously.
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.. note:: The scheduler determines the requirements of a command when it is scheduled, so
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this method should normally be called from the command's constructor.
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:param requirements: the requirements to add
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"""
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self.requirements.update(requirements)
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def getName(self) -> str:
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"""
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Gets the name of this Command.
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:returns: Name
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"""
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return SendableRegistry.getName(self)
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def setName(self, name: str):
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"""
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Sets the name of this Command.
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:param name: Name
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"""
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SendableRegistry.setName(self, name)
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def getSubsystem(self) -> str:
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"""
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Gets the subsystem name of this Subsystem.
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:returns: Subsystem name
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"""
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return SendableRegistry.getSubsystem(self)
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def setSubsystem(self, subsystem: str):
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"""
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Sets the subsystem name of this Subsystem.
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:param subsystem: subsystem name
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"""
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SendableRegistry.setSubsystem(self, subsystem)
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def withTimeout(self, seconds: float) -> ParallelRaceGroup:
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"""
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Decorates this command with a timeout. If the specified timeout is exceeded before the command
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finishes normally, the command will be interrupted and un-scheduled. Note that the timeout only
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applies to the command returned by this method; the calling command is not itself changed.
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.. note:: This decorator works by adding this command to a composition.
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The command the decorator was called on cannot be scheduled
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independently or be added to a different composition (namely,
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decorators), unless it is manually cleared from the list of composed
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commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
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The command composition returned from this method can be further
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decorated without issue.
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:param seconds: the timeout duration
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:returns: the command with the timeout added
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"""
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from .waitcommand import WaitCommand
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return self.raceWith(WaitCommand(seconds))
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def until(self, condition: Callable[[], bool]) -> ParallelRaceGroup:
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"""
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Decorates this command with an interrupt condition. If the specified condition becomes true
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before the command finishes normally, the command will be interrupted and un-scheduled.
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.. note:: This decorator works by adding this command to a composition.
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The command the decorator was called on cannot be scheduled
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independently or be added to a different composition (namely,
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decorators), unless it is manually cleared from the list of composed
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commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
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The command composition returned from this method can be further
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decorated without issue.
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:param condition: the interrupt condition
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:returns: the command with the interrupt condition added
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"""
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from .waituntilcommand import WaitUntilCommand
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return self.raceWith(WaitUntilCommand(condition))
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def onlyWhile(self, condition: Callable[[], bool]) -> ParallelRaceGroup:
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"""
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Decorates this command with a run condition. If the specified condition becomes false before
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the command finishes normally, the command will be interrupted and un-scheduled.
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.. note:: This decorator works by adding this command to a composition.
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The command the decorator was called on cannot be scheduled
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independently or be added to a different composition (namely,
|
||||
decorators), unless it is manually cleared from the list of composed
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commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
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The command composition returned from this method can be further
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decorated without issue.
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:param condition: the interrupt condition
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:returns: the command with the interrupt condition added
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"""
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assert callable(condition)
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return self.until(lambda: not condition())
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def beforeStarting(
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self, before: Union[Command, Callable[[], None]]
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) -> SequentialCommandGroup:
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"""
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Decorates this command with a callable or command to run before this command starts.
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.. note:: This decorator works by adding this command to a composition.
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The command the decorator was called on cannot be scheduled
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independently or be added to a different composition (namely,
|
||||
decorators), unless it is manually cleared from the list of composed
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commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
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The command composition returned from this method can be further
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decorated without issue.
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:param before: the command to run before this one
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:returns: the decorated command
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"""
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from .instantcommand import InstantCommand
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from .sequentialcommandgroup import SequentialCommandGroup
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if callable(before):
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before = InstantCommand(before)
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return SequentialCommandGroup(before, self)
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def andThen(self, *next: Command) -> SequentialCommandGroup:
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"""
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Decorates this command with a set of commands to run after it in sequence. Often more
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convenient/less-verbose than constructing a new SequentialCommandGroup explicitly.
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.. note:: This decorator works by adding this command to a composition.
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The command the decorator was called on cannot be scheduled
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independently or be added to a different composition (namely,
|
||||
decorators), unless it is manually cleared from the list of composed
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commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
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The command composition returned from this method can be further
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decorated without issue.
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:param next: the commands to run next
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:returns: the decorated command
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"""
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from .sequentialcommandgroup import SequentialCommandGroup
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return SequentialCommandGroup(self, *next)
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def deadlineWith(self, *parallel: Command) -> ParallelDeadlineGroup:
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"""
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Decorates this command with a set of commands to run parallel to it, ending when the calling
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command ends and interrupting all the others. Often more convenient/less-verbose than
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constructing a new ParallelDeadlineGroup explicitly.
|
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.. note:: This decorator works by adding this command to a composition.
|
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The command the decorator was called on cannot be scheduled
|
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independently or be added to a different composition (namely,
|
||||
decorators), unless it is manually cleared from the list of composed
|
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commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
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The command composition returned from this method can be further
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decorated without issue.
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:param parallel: the commands to run in parallel
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:returns: the decorated command
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"""
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import warnings
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warnings.warn(
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"deadlineWith is deprecated use deadlineFor instead",
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DeprecationWarning,
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stacklevel=2,
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)
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from .paralleldeadlinegroup import ParallelDeadlineGroup
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return ParallelDeadlineGroup(self, *parallel)
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def deadlineFor(self, *parallel: Command) -> ParallelDeadlineGroup:
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"""
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Decorates this command with a set of commands to run parallel to it, ending when the calling
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command ends and interrupting all the others. Often more convenient/less-verbose than
|
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constructing a new ParallelDeadlineGroup explicitly.
|
||||
|
||||
.. note:: This decorator works by adding this command to a composition.
|
||||
The command the decorator was called on cannot be scheduled
|
||||
independently or be added to a different composition (namely,
|
||||
decorators), unless it is manually cleared from the list of composed
|
||||
commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
|
||||
The command composition returned from this method can be further
|
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decorated without issue.
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||||
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:param parallel: the commands to run in parallel
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:returns: the decorated command
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"""
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from .paralleldeadlinegroup import ParallelDeadlineGroup
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return ParallelDeadlineGroup(self, *parallel)
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def alongWith(self, *parallel: Command) -> ParallelCommandGroup:
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"""
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Decorates this command with a set of commands to run parallel to it, ending when the last
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command ends. Often more convenient/less-verbose than constructing a new {@link
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ParallelCommandGroup} explicitly.
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||||
|
||||
.. note:: This decorator works by adding this command to a composition.
|
||||
The command the decorator was called on cannot be scheduled
|
||||
independently or be added to a different composition (namely,
|
||||
decorators), unless it is manually cleared from the list of composed
|
||||
commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
|
||||
The command composition returned from this method can be further
|
||||
decorated without issue.
|
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:param parallel: the commands to run in parallel
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:returns: the decorated command
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"""
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from .parallelcommandgroup import ParallelCommandGroup
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return ParallelCommandGroup(self, *parallel)
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def raceWith(self, *parallel: Command) -> ParallelRaceGroup:
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"""
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Decorates this command with a set of commands to run parallel to it, ending when the first
|
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command ends. Often more convenient/less-verbose than constructing a new {@link
|
||||
ParallelRaceGroup} explicitly.
|
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|
||||
.. note:: This decorator works by adding this command to a composition.
|
||||
The command the decorator was called on cannot be scheduled
|
||||
independently or be added to a different composition (namely,
|
||||
decorators), unless it is manually cleared from the list of composed
|
||||
commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
|
||||
The command composition returned from this method can be further
|
||||
decorated without issue.
|
||||
|
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:param parallel: the commands to run in parallel
|
||||
:returns: the decorated command
|
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"""
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from .parallelracegroup import ParallelRaceGroup
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return ParallelRaceGroup(self, *parallel)
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def repeatedly(self) -> RepeatCommand:
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"""
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Decorates this command to run repeatedly, restarting it when it ends, until this command is
|
||||
interrupted. The decorated command can still be canceled.
|
||||
|
||||
.. note:: This decorator works by adding this command to a composition.
|
||||
The command the decorator was called on cannot be scheduled
|
||||
independently or be added to a different composition (namely,
|
||||
decorators), unless it is manually cleared from the list of composed
|
||||
commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
|
||||
The command composition returned from this method can be further
|
||||
decorated without issue.
|
||||
|
||||
:returns: the decorated command
|
||||
"""
|
||||
from .repeatcommand import RepeatCommand
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||||
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return RepeatCommand(self)
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def asProxy(self) -> ProxyCommand:
|
||||
"""
|
||||
Decorates this command to run "by proxy" by wrapping it in a ProxyCommand. Use this for
|
||||
"forking off" from command compositions when the user does not wish to extend the command's
|
||||
requirements to the entire command composition. ProxyCommand has unique implications and
|
||||
semantics, see the `WPILib docs <https://docs.wpilib.org/en/stable/docs/software/commandbased/command-compositions.html#scheduling-other-commands>`_ for a full explanation.
|
||||
|
||||
:returns: the decorated command
|
||||
"""
|
||||
from .proxycommand import ProxyCommand
|
||||
|
||||
return ProxyCommand(self)
|
||||
|
||||
def unless(self, condition: Callable[[], bool]) -> ConditionalCommand:
|
||||
"""
|
||||
Decorates this command to only run if this condition is not met. If the command is already
|
||||
running and the condition changes to true, the command will not stop running. The requirements
|
||||
of this command will be kept for the new conditional command.
|
||||
|
||||
.. note:: This decorator works by adding this command to a composition.
|
||||
The command the decorator was called on cannot be scheduled
|
||||
independently or be added to a different composition (namely,
|
||||
decorators), unless it is manually cleared from the list of composed
|
||||
commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
|
||||
The command composition returned from this method can be further
|
||||
decorated without issue.
|
||||
|
||||
:param condition: the condition that will prevent the command from running
|
||||
:returns: the decorated command
|
||||
"""
|
||||
from .conditionalcommand import ConditionalCommand
|
||||
from .instantcommand import InstantCommand
|
||||
|
||||
return ConditionalCommand(InstantCommand(), self, condition)
|
||||
|
||||
def onlyIf(self, condition: Callable[[], bool]) -> ConditionalCommand:
|
||||
"""
|
||||
Decorates this command to only run if this condition is met. If the command is already running
|
||||
and the condition changes to false, the command will not stop running. The requirements of this
|
||||
command will be kept for the new conditional command.
|
||||
|
||||
.. note:: This decorator works by adding this command to a composition.
|
||||
The command the decorator was called on cannot be scheduled
|
||||
independently or be added to a different composition (namely,
|
||||
decorators), unless it is manually cleared from the list of composed
|
||||
commands with :func:`commands2.CommandScheduler.removeComposedCommand`.
|
||||
The command composition returned from this method can be further
|
||||
decorated without issue.
|
||||
|
||||
:param condition: the condition that will allow the command to run
|
||||
:returns: the decorated command
|
||||
"""
|
||||
return self.unless(lambda: not condition())
|
||||
|
||||
def ignoringDisable(self, doesRunWhenDisabled: bool) -> WrapperCommand:
|
||||
"""
|
||||
Decorates this command to run or stop when disabled.
|
||||
|
||||
:param doesRunWhenDisabled: true to run when disabled.
|
||||
:returns: the decorated command
|
||||
"""
|
||||
from .wrappercommand import WrapperCommand
|
||||
|
||||
class W(WrapperCommand):
|
||||
def runsWhenDisabled(self) -> bool:
|
||||
return doesRunWhenDisabled
|
||||
|
||||
return W(self)
|
||||
|
||||
def withInterruptBehavior(self, behavior: InterruptionBehavior) -> WrapperCommand:
|
||||
"""
|
||||
Decorates this command to have a different InterruptionBehavior interruption behavior.
|
||||
|
||||
:param interruptBehavior: the desired interrupt behavior
|
||||
:returns: the decorated command
|
||||
"""
|
||||
from .wrappercommand import WrapperCommand
|
||||
|
||||
class W(WrapperCommand):
|
||||
def getInterruptionBehavior(self) -> InterruptionBehavior:
|
||||
return behavior
|
||||
|
||||
return W(self)
|
||||
|
||||
def finallyDo(self, end: Callable[[bool], Any]) -> WrapperCommand:
|
||||
"""
|
||||
Decorates this command with a lambda to call on interrupt or end, following the command's
|
||||
inherent :func:`commands2.Command.end` method.
|
||||
|
||||
:param end: a lambda accepting a boolean parameter specifying whether the command was
|
||||
interrupted.
|
||||
:return: the decorated command
|
||||
"""
|
||||
from .wrappercommand import WrapperCommand
|
||||
|
||||
class W(WrapperCommand):
|
||||
def end(self, interrupted: bool) -> None:
|
||||
self._command.end(interrupted)
|
||||
end(interrupted)
|
||||
|
||||
return W(self)
|
||||
|
||||
def handleInterrupt(self, handler: Callable[[], Any]) -> WrapperCommand:
|
||||
"""
|
||||
Decorates this command with a lambda to call on interrupt, following the command's inherent
|
||||
:func:`commands2.Command.end` method.
|
||||
|
||||
:param handler: a lambda to run when the command is interrupted
|
||||
:returns: the decorated command
|
||||
"""
|
||||
return self.finallyDo(lambda interrupted: handler() if interrupted else None)
|
||||
|
||||
def schedule(self) -> None:
|
||||
"""Schedules this command."""
|
||||
from .commandscheduler import CommandScheduler
|
||||
|
||||
CommandScheduler.getInstance().schedule(self)
|
||||
|
||||
def cancel(self) -> None:
|
||||
"""
|
||||
Cancels this command. Will call ``end(true)``. Commands will be canceled
|
||||
regardless of InterruptionBehavior interruption behavior.
|
||||
"""
|
||||
from .commandscheduler import CommandScheduler
|
||||
|
||||
CommandScheduler.getInstance().cancel(self)
|
||||
|
||||
def isScheduled(self) -> bool:
|
||||
"""
|
||||
Whether the command is currently scheduled. Note that this does not detect whether the command
|
||||
is in a composition, only whether it is directly being run by the scheduler.
|
||||
|
||||
:returns: Whether the command is scheduled.
|
||||
"""
|
||||
from .commandscheduler import CommandScheduler
|
||||
|
||||
return CommandScheduler.getInstance().isScheduled(self)
|
||||
|
||||
def hasRequirement(self, requirement: Subsystem) -> bool:
|
||||
"""
|
||||
Whether the command requires a given subsystem.
|
||||
|
||||
:param requirement: the subsystem to inquire about
|
||||
:returns: whether the subsystem is required
|
||||
"""
|
||||
return requirement in self.requirements
|
||||
|
||||
def getInterruptionBehavior(self) -> InterruptionBehavior:
|
||||
"""
|
||||
How the command behaves when another command with a shared requirement is scheduled.
|
||||
|
||||
:returns: a variant of InterruptionBehavior, defaulting to {@link InterruptionBehavior#kCancelSelf kCancelSelf}.
|
||||
"""
|
||||
return InterruptionBehavior.kCancelSelf
|
||||
|
||||
def runsWhenDisabled(self) -> bool:
|
||||
"""
|
||||
Whether the given command should run when the robot is disabled. Override to return true if the
|
||||
command should run when disabled.
|
||||
|
||||
:returns: whether the command should run when the robot is disabled
|
||||
"""
|
||||
return False
|
||||
|
||||
def withName(self, name: str) -> WrapperCommand:
|
||||
"""
|
||||
Decorates this command with a name.
|
||||
|
||||
:param name: the name of the command
|
||||
:returns: the decorated command
|
||||
"""
|
||||
from .wrappercommand import WrapperCommand
|
||||
|
||||
wrapper = WrapperCommand(self)
|
||||
wrapper.setName(name)
|
||||
return wrapper
|
||||
|
||||
def initSendable(self, builder: SendableBuilder) -> None:
|
||||
from .commandscheduler import CommandScheduler
|
||||
|
||||
builder.setSmartDashboardType("Command")
|
||||
builder.addStringProperty(
|
||||
".name",
|
||||
self.getName,
|
||||
lambda _: None,
|
||||
)
|
||||
|
||||
def on_set(value: bool) -> None:
|
||||
if value:
|
||||
if not self.isScheduled():
|
||||
self.schedule()
|
||||
else:
|
||||
if self.isScheduled():
|
||||
self.cancel()
|
||||
|
||||
builder.addBooleanProperty(
|
||||
"running",
|
||||
self.isScheduled,
|
||||
on_set,
|
||||
)
|
||||
builder.addBooleanProperty(
|
||||
".isParented",
|
||||
lambda: CommandScheduler.getInstance().isComposed(self),
|
||||
lambda _: None,
|
||||
)
|
||||
builder.addStringProperty(
|
||||
"interruptBehavior",
|
||||
lambda: self.getInterruptionBehavior().name,
|
||||
lambda _: None,
|
||||
)
|
||||
builder.addBooleanProperty(
|
||||
"runsWhenDisabled",
|
||||
self.runsWhenDisabled,
|
||||
lambda _: None,
|
||||
)
|
||||
Reference in New Issue
Block a user