tools/build_rules/verifier_test/unbundle.py

#
# Copyright 2016 The Kythe 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.
#
"""Extract a bundled C++ indexer test into the specified directory."""
import argparse
import contextlib
import errno
import os
import os.path


class BundleWriter(object):
  def __init__(self, root):
    self.includes = []
    self.root = os.path.join(root, "test_bundle")
    self.current = None
    self.open("test.cc")

  def open(self, path):
    make_dirs(os.path.dirname(os.path.join(self.root, path)))
    if self.current is not None:
      self.current.close()
    self.current = open(os.path.join(self.root, path), "w")

  def add_include(self, path):
    self.includes.append(path)

  def close(self):
    self.current.close()
    self.current = None

    cflagspath = os.path.join(os.path.dirname(self.root), "cflags")
    with open(cflagspath, "w") as cflags:
      for path in self.includes:
        cflags.write("-I")
        cflags.write(os.path.join(self.root, path))
        cflags.write("\n")

  def write(self, line):
    self.current.write(line)


@contextlib.contextmanager
def open_writer(root):
  writer = BundleWriter(root)
  try:
    yield writer
  finally:
    writer.close()


def make_dirs(path):
  try:
    os.makedirs(path)
  except OSError as error:
    # Suppress creation failure for even the leaf directory.
    if error.errno != errno.EEXIST:
      raise


def main():
  parser = argparse.ArgumentParser()
  parser.add_argument("input", type=argparse.FileType("r"))
  parser.add_argument("output_root")

  args = parser.parse_args()
  with open_writer(args.output_root) as writer:
    for line in args.input:
      if line.startswith('#example '):
        writer.open(line.split(None, 1)[1].strip())
      elif line.startswith('#incdir '):
        writer.add_include(line.split(None, 1)[1].strip())
      else:
        writer.write(line)

if __name__ == "__main__":
  main()