[Android] Sets up a coverage system for java using EMMA

build/android/emma_html_output.py

Index: build/android/emma_html_output.py
diff --git a/build/android/emma_html_output.py b/build/android/emma_html_output.py
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+#! /usr/bin/env python
+
+# Copyright 2013 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.
+
+"""Accumulates EMMA coverage files to produce html output."""
+
+import logging
+import optparse
+import os
+import sys
+
+from pylib import cmd_helper
+from pylib import constants
+
+
+def _GetFilesWithExt(root_dir, ext):
+  """Gets all files with a given extension.
+
+  Args:
+    root_dir: Directory in which to search for files.
+    ext: Extension to look for (including dot)
+
+  Returns:
+    A list of absolute paths to files that match.
+  """
+
+  files = []
+  for root, _, filenames in os.walk(root_dir):
+    basenames = [f for f in filenames if os.path.splitext(f)[1] == ext]
+    files.extend([os.path.join(root, basename)
+                  for basename in basenames])
+
+  return files
+
+
+def main(argv):
+  option_parser = optparse.OptionParser()
+  option_parser.add_option('-o', '--output', help='HTML output filename.')
+  option_parser.add_option('-c', '--coverage_dir', default=None,
+                           help=('Root of the directory in which to search for '
+                                 'coverage data (.ec) files.'))
+  option_parser.add_option('-m', '--metadata_dir', default=None,
+                           help=('Root of the directory in which to search for '
+                                 'coverage metadata (.em) files.'))
+  options, args = option_parser.parse_args()
+
+  if not options.coverage_dir:
+    option_parser.error('--coverage_dir is required.')
+    return constants.ERROR_EXIT_CODE
+
+  if not options.metadata_dir:
+    option_parser.error('--metadata_dir is required.')
+    return constants.ERROR_EXIT_CODE
+
+  if not options.output:
+    option_parser.error('--output is required.')
+    return constants.ERROR_EXIT_CODE
+
+  android_sdk_root = os.environ.get('ANDROID_SDK_ROOT')
+  if not android_sdk_root:
+    logging.error('Environment variable ANDROID_SDK_ROOT must be set.')
+    return constants.ERROR_EXIT_CODE
+
+  emma_file = os.path.join(android_sdk_root, 'tools', 'lib', 'emma.jar')
+
+  coverage_files = _GetFilesWithExt(options.coverage_dir, '.ec')
+  metadata_files = _GetFilesWithExt(options.metadata_dir, '.em')
+
+  file_args = []
+  for f in coverage_files + metadata_files:
+    file_args.append('-in')
+    file_args.append(f)
+
+  output_args = ['-Dreport.html.out.file', options.output]
+
+  return cmd_helper.RunCmd(['java', '-cp', emma_file, 'emma',
+                            'report', '-r', 'html'] + file_args + output_args)
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))