| # 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)) |