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# Copyright 2023 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.
# std_modules.py is a long-living program that communicates over STDIN and
# STDOUT. STDIN receives module names, one per line. For each module statement
# it evaluates, it outputs true/false for whether the module is part of the
# standard library or not.
import os
import sys
from contextlib import redirect_stdout
def is_std_modules(module):
# If for some reason a module (such as pygame, see https://github.com/pygame/pygame/issues/542)
# prints to stdout upon import,
# the output of this script should still be parseable by golang.
# Therefore, redirect stdout while running the import.
with redirect_stdout(os.devnull):
try:
__import__(module, globals(), locals(), [], 0)
return True
except Exception:
return False
def main(stdin, stdout):
for module in stdin:
module = module.strip()
# Don't print the boolean directly as it is capitalized in Python.
print(
"true" if is_std_modules(module) else "false",
end="\n",
file=stdout,
)
stdout.flush()
if __name__ == "__main__":
exit(main(sys.stdin, sys.stdout))
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