Fix an issue that tools/license.py fails when BUILD.gn is not directly

tools/licenses.py

 #!/usr/bin/env python
 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Utility for checking and processing licensing information in third_party
 directories.
 
 Usage: licenses.py <command>
 
 Commands:
   scan     scan third_party directories, verifying that we have licensing info
   credits  generate about:credits on stdout
 
 (You can also import this as a module.)
 """
 
 import argparse
 import cgi
 import os
+import re
 import subprocess
 import sys
 
 # TODO(agrieve): Move build_utils.WriteDepFile into a non-android directory.
 _REPOSITORY_ROOT = os.path.dirname(os.path.dirname(__file__))
 sys.path.append(os.path.join(_REPOSITORY_ROOT, 'build/android/gyp/util'))
 import build_utils
 
 
 # Paths from the root of the tree to directories to skip.
@@ skipping 449 matching lines @@
 
 def FindThirdPartyDeps(gn_out_dir, gn_target):
     if not gn_out_dir:
         raise RuntimeError("--gn-out-dir is required if --gn-target is used.")
 
     gn_deps = subprocess.check_output([_GnBinary(), "desc", gn_out_dir,
                                        gn_target,
                                        "deps", "--as=buildfile", "--all"])
     third_party_deps = set()
     for build_dep in gn_deps.split():
-        if ("third_party" in build_dep and
-                os.path.basename(build_dep) == "BUILD.gn"):
-            third_party_deps.add(os.path.dirname(build_dep))
+        # Note that it must always return the direct sub-directory of
+        # third_party. e.g.:
+        # .../third_party/cld_3/src/src/BUILD.gn -> .../third_party/cld_3
+        m = re.search(r"^(.+/third_party/[^/]+)/(.+/)?BUILD\.gn$", build_dep)

[Paweł Hajdan Jr., 2017/04/06 11:55:09]

nit: Use single quotes ' .

[Hiroshi Ichikawa, 2017/04/07 05:07:51]

Done.

+        if m:
+            third_party_deps.add(m.group(1))
     return third_party_deps
 
 
 def ScanThirdPartyDirs(root=None):
     """Scan a list of directories and report on any problems we find."""
     if root is None:
       root = os.getcwd()
     third_party_dirs = FindThirdPartyDirsWithFiles(root)
 
     errors = []
@@ skipping 128 matching lines @@
                                args.output_file, args.target_os,
                                args.gn_out_dir, args.gn_target, args.depfile):
             return 1
     else:
         print __doc__
         return 1
 
 
 if __name__ == '__main__':
   sys.exit(main())