Rewrite generate-bindings.pl in Python

Source/bindings/scripts/compare-python-to-perl

+#!/usr/bin/python
+# Copyright (C) 2013 Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+
+import errno
+import filecmp
+import fnmatch
+import optparse
+import os
+import os.path
+import shutil
+import subprocess
+import sys
+
+
+test_output_dir = os.path.join(os.curdir, 'test_output')
+perl_dir = os.path.join(test_output_dir, 'perl')
+python_dir = os.path.join(test_output_dir, 'python')
+
+
+def parse_options():
+    """Parse options.
+
+    Arguments are list of IDL file basenames to test;
+    if absent, test all IDL files.
+
+    Options are:
+    --clean: clean up (delete output directories)
+    --generate-only: generate but do not compare (good for manual testing)
+    --verbose
+
+    Returns:
+      options, files: arguments are list of files to test
+    """
+    parser = optparse.OptionParser()
+    parser.add_option('--clean', action='store_true', default=False)
+    parser.add_option('--generate-only', action='store_true', default=False)
+    parser.add_option('--verbose', action='store_true', default=False)
+    parser.disable_interspersed_args()
+
+    return parser.parse_args()
+
+
+def find_idl_files(basename_list):
+    module_path, _ = os.path.split(__file__)
+    source_dir = os.path.join(module_path, os.pardir, os.pardir, os.pardir, 'Source')
+    idl_list = []
+    for root, _, filenames in os.walk(source_dir):
+        for filename in filenames:
+            if os.path.basename(filename) in basename_list:
+                idl_list.append(os.path.join(root, filename))
+    return idl_list
+
+
+def all_idl_files():
+    module_path, _ = os.path.split(__file__)
+    source_dir = os.path.join(module_path, os.pardir, os.pardir, os.pardir, 'Source')
+    idl_list = []
+    for root, _, filenames in os.walk(source_dir):
+        for filename in fnmatch.filter(filenames, '*.idl'):
+            idl_list.append(os.path.join(root, filename))
+    return idl_list
+
+
+def make_output_dirs():
+    for path in [perl_dir, python_dir]:
+        try:
+            os.makedirs(path)
+        except OSError as exception:
+            if exception.errno != errno.EEXIST:
+                raise
+
+
+def cleanup():
+    shutil.rmtree(test_output_dir)
+
+
+def generate_perl(idl_file_list):
+    for idl_file in idl_file_list:
+        cmd = ['perl', '-w',
+               '-I../../core/scripts',
+               'generate-bindings.pl',
+               '--outputDir', perl_dir,
+               idl_file]
+        subprocess.check_call(cmd)
+
+
+def generate_python(idl_file_list):
+    for idl_file in idl_file_list:
+        cmd = ['python',
+               'generate_bindings.py',
+               '--perl-parser',
+               '--output-dir', python_dir,
+               idl_file]
+        subprocess.check_call(cmd)
+
+
+def compare_output():
+    dir_cmp = filecmp.dircmp(perl_dir, python_dir)
+    print dir_cmp.report()
+
+
+def main():
+    options, idl_files_basenames = parse_options()
+    if options.clean:
+        cleanup()
+        return
+    if idl_files_basenames:
+        idl_files = find_idl_files(idl_files_basenames)
+    else:
+        idl_files = all_idl_files()
+    make_output_dirs()
+    generate_perl(idl_files)
+    generate_python(idl_files)
+    if options.generate_only:
+        return
+    compare_output()
+
+
+if __name__ == '__main__':
+    sys.exit(main())