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# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
from mozbuild.util import ReadOnlyDict
from taskgraph.task import Task
immutable_types = {int, float, bool, str, type(None), ReadOnlyDict}
def copy_task(obj):
"""
Perform a deep copy of a task that has a tree-like structure.
Unlike copy.deepcopy, this does *not* support copying graph-like structure,
but it does it more efficiently than deepcopy.
"""
ty = type(obj)
if ty in immutable_types:
return obj
if ty is dict:
return {k: copy_task(v) for k, v in obj.items()}
if ty is list:
return [copy_task(elt) for elt in obj]
if ty is Task:
task = Task(
kind=copy_task(obj.kind),
label=copy_task(obj.label),
attributes=copy_task(obj.attributes),
task=copy_task(obj.task),
description=copy_task(obj.description),
optimization=copy_task(obj.optimization),
dependencies=copy_task(obj.dependencies),
soft_dependencies=copy_task(obj.soft_dependencies),
if_dependencies=copy_task(obj.if_dependencies),
)
if obj.task_id:
task.task_id = obj.task_id
return task
raise NotImplementedError(f"copying '{ty}' from '{obj}'")
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