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# 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.
"""Top-level presubmit script for Chromium media component.
See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
for more details about the presubmit API built into gcl.
"""
def _CheckForUseOfWrongClock(input_api, output_api):
"""Make sure new lines of media code don't use a clock susceptible to skew."""
def FilterFile(affected_file):
"""Return true if the file could contain code referencing base::Time."""
return affected_file.LocalPath().endswith(
('.h', '.cc', '.cpp', '.cxx', '.mm'))
# Regular expression that should detect any explicit references to the
# base::Time type (or base::Clock/DefaultClock), whether in using decls,
# typedefs, or to call static methods.
base_time_type_pattern = r'(^|\W)base::(Time|Clock|DefaultClock)(\W|$)'
# Regular expression that should detect references to the base::Time class
# members, such as a call to base::Time::Now.
base_time_member_pattern = r'(^|\W)(Time|Clock|DefaultClock)::'
# Regular expression to detect "using base::Time" declarations. We want to
# prevent these from triggerring a warning. For example, it's perfectly
# reasonable for code to be written like this:
#
# using base::Time;
# ...
# int64 foo_us = foo_s * Time::kMicrosecondsPerSecond;
using_base_time_decl_pattern = r'^\s*using\s+(::)?base::Time\s*;'
# Regular expression to detect references to the kXXX constants in the
# base::Time class. We want to prevent these from triggerring a warning.
base_time_konstant_pattern = r'(^|\W)Time::k\w+'
problem_re = input_api.re.compile(
r'(' + base_time_type_pattern + r')|(' + base_time_member_pattern + r')')
exception_re = input_api.re.compile(
r'(' + using_base_time_decl_pattern + r')|(' +
base_time_konstant_pattern + r')')
problems = []
for f in input_api.AffectedSourceFiles(FilterFile):
for line_number, line in f.ChangedContents():
if problem_re.search(line):
if not exception_re.search(line):
problems.append(
' %s:%d\n %s' % (f.LocalPath(), line_number, line.strip()))
if problems:
return [output_api.PresubmitPromptOrNotify(
'You added one or more references to the base::Time class and/or one\n'
'of its member functions (or base::Clock/DefaultClock). In media\n'
'code, it is rarely correct to use a clock susceptible to time skew!\n'
'Instead, could you use base::TimeTicks to track the passage of\n'
'real-world time?\n\n' +
'\n'.join(problems))]
else:
return []
def _CheckChange(input_api, output_api):
results = []
results.extend(_CheckForUseOfWrongClock(input_api, output_api))
return results
def CheckChangeOnUpload(input_api, output_api):
return _CheckChange(input_api, output_api)
def CheckChangeOnCommit(input_api, output_api):
return _CheckChange(input_api, output_api)
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