# Copyright (C) 2023 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""An empty toolchain that does nothing."""

def _empty_toolchain_impl(_ctx):
    return platform_common.ToolchainInfo()

_empty_toolchain = rule(
    implementation = _empty_toolchain_impl,
)

def empty_toolchain(
        name,
        toolchain_type,
        **kwargs):
    """Defines an empty toolchain.

    Args:
        name: name of the toolchain
        toolchain_type: type of the toolchain
        **kwargs: additional kwargs passed to the toolchain target
    """

    private_kwargs = kwargs | dict(
        visibility = ["//visibility:private"],
    )

    _empty_toolchain(
        name = name + "_internal",
        **private_kwargs
    )

    native.toolchain(
        name = name,
        toolchain = name + "_internal",
        toolchain_type = toolchain_type,
        **kwargs
    )