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# Copyright 2019 The Bazel Authors. All rights reserved.
#
# 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.
"""Utilities for the @bazel_tools//tools/python package.
This file does not access any Python-rules-specific logic, and is therefore
less likely to be broken by Python-related changes. That in turn means this
file is less likely to cause bootstrapping issues.
"""
def _expand_pyversion_template_impl(ctx):
for output, version, strict in [
(ctx.outputs.out2, "2", "1"),
(ctx.outputs.out3, "3", "1"),
(ctx.outputs.out2_nonstrict, "2", "0"),
(ctx.outputs.out3_nonstrict, "3", "0"),
]:
if output:
ctx.actions.expand_template(
template = ctx.file.template,
output = output,
substitutions = {
"%VERSION%": version,
"%STRICT%": strict,
},
is_executable = True,
)
expand_pyversion_template = rule(
implementation = _expand_pyversion_template_impl,
attrs = {
"template": attr.label(
allow_single_file = True,
doc = "The input template file.",
),
"out2": attr.output(doc = "The Python 2 strict wrapper."),
"out3": attr.output(doc = "The Python 3 strict wrapper."),
"out2_nonstrict": attr.output(
doc = "The Python 2 non-strict wrapper.",
),
"out3_nonstrict": attr.output(
doc = "The Python 3 non-strict wrapper.",
),
},
doc = """\
Given the pywrapper template file, generates expansions for both versions of
Python and both levels of strictness.""",
)
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