Configure components/viz/ directory.

components/viz/PRESUBMIT.py

Index: components/viz/PRESUBMIT.py
diff --git a/components/viz/PRESUBMIT.py b/components/viz/PRESUBMIT.py
new file mode 100644
index 0000000000000000000000000000000000000000..563a4def66ddeaba2810c2f0d5430884ccd21d39
--- /dev/null
+++ b/components/viz/PRESUBMIT.py
@@ -0,0 +1,326 @@
+# Copyright 2017 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 components/viz.
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into depot_tools.
+"""
+
+import re
+import string
+
+VIZ_SOURCE_FILES=(r'^components[\\/]viz[\\/].*\.(cc|h)$',)
+
+def CheckChangeLintsClean(input_api, output_api):
+  source_filter = lambda x: input_api.FilterSourceFile(
+    x, white_list=VIZ_SOURCE_FILES, black_list=None)
+
+  return input_api.canned_checks.CheckChangeLintsClean(
+      input_api, output_api, source_filter, lint_filters=[], verbose_level=1)
+
+def CheckAsserts(input_api, output_api, white_list=VIZ_SOURCE_FILES, black_list=None):
+  black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
+  source_file_filter = lambda x: input_api.FilterSourceFile(x, white_list, black_list)
+
+  assert_files = []
+  notreached_files = []
+
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    contents = input_api.ReadFile(f, 'rb')
+    # WebKit ASSERT() is not allowed.
+    if re.search(r"\bASSERT\(", contents):
+      assert_files.append(f.LocalPath())
+    # WebKit ASSERT_NOT_REACHED() is not allowed.

[danakj, 2017/04/05 16:41:30]

ASSERT_NOT_REACHED() has gone away now, so this could be removed (in cc also)

[kylechar, 2017/04/05 16:53:41]

Done.

+    if re.search(r"ASSERT_NOT_REACHED\(", contents):
+      notreached_files.append(f.LocalPath())
+
+  if assert_files:
+    return [output_api.PresubmitError(
+      'These files use ASSERT instead of using DCHECK:',
+      items=assert_files)]
+  if notreached_files:
+    return [output_api.PresubmitError(
+      'These files use ASSERT_NOT_REACHED instead of using NOTREACHED:',
+      items=notreached_files)]
+  return []
+
+def CheckStdAbs(input_api, output_api,
+                white_list=VIZ_SOURCE_FILES, black_list=None):
+  black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
+  source_file_filter = lambda x: input_api.FilterSourceFile(x,
+                                                            white_list,
+                                                            black_list)
+
+  using_std_abs_files = []
+  found_fabs_files = []
+  missing_std_prefix_files = []
+
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    contents = input_api.ReadFile(f, 'rb')
+    if re.search(r"using std::f?abs;", contents):
+      using_std_abs_files.append(f.LocalPath())
+    if re.search(r"\bfabsf?\(", contents):
+      found_fabs_files.append(f.LocalPath());
+
+    no_std_prefix = r"(?<!std::)"
+    # Matches occurrences of abs/absf/fabs/fabsf without a "std::" prefix.
+    abs_without_prefix = r"%s(\babsf?\()" % no_std_prefix
+    fabs_without_prefix = r"%s(\bfabsf?\()" % no_std_prefix
+    # Skips matching any lines that have "// NOLINT".
+    no_nolint = r"(?![^\n]*//\s+NOLINT)"
+
+    expression = re.compile("(%s|%s)%s" %
+        (abs_without_prefix, fabs_without_prefix, no_nolint))
+    if expression.search(contents):
+      missing_std_prefix_files.append(f.LocalPath())
+
+  result = []
+  if using_std_abs_files:
+    result.append(output_api.PresubmitError(
+        'These files have "using std::abs" which is not permitted.',
+        items=using_std_abs_files))
+  if found_fabs_files:
+    result.append(output_api.PresubmitError(
+        'std::abs() should be used instead of std::fabs() for consistency.',
+        items=found_fabs_files))
+  if missing_std_prefix_files:
+    result.append(output_api.PresubmitError(
+        'These files use abs(), absf(), fabs(), or fabsf() without qualifying '
+        'the std namespace. Please use std::abs() in all places.',
+        items=missing_std_prefix_files))
+  return result
+
+def CheckPassByValue(input_api,
+                     output_api,
+                     white_list=VIZ_SOURCE_FILES,
+                     black_list=None):
+  black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
+  source_file_filter = lambda x: input_api.FilterSourceFile(x,
+                                                            white_list,
+                                                            black_list)
+
+  local_errors = []
+
+  # Well-defined simple classes containing only <= 4 ints, or <= 2 floats.

[danakj, 2017/04/05 16:41:30]

This is actually now types the same size as a primitive type, could you say that
instead (in cc too)?

[kylechar, 2017/04/05 16:53:41]

Done.

+  pass_by_value_types = ['base::Time',
+                         'base::TimeTicks',
+                         ]
+
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    contents = input_api.ReadFile(f, 'rb')
+    match = re.search(
+      r'\bconst +' + '(?P<type>(%s))&' %
+        string.join(pass_by_value_types, '|'),
+      contents)
+    if match:
+      local_errors.append(output_api.PresubmitError(
+        '%s passes %s by const ref instead of by value.' %
+        (f.LocalPath(), match.group('type'))))
+  return local_errors
+
+def CheckTodos(input_api, output_api):
+  errors = []
+
+  source_file_filter = lambda x: x
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    contents = input_api.ReadFile(f, 'rb')
+    if ('FIX'+'ME') in contents:
+      errors.append(f.LocalPath())
+
+  if errors:
+    return [output_api.PresubmitError(
+      'All TODO comments should be of the form TODO(name). ' +

[danakj, 2017/04/05 16:41:30]

TODO(name/bug) is the new format, can you say that (and in cc too)

[kylechar, 2017/04/05 16:53:41]

Done.

+      'Use TODO instead of FIX' + 'ME',
+      items=errors)]
+  return []
+
+def CheckDoubleAngles(input_api, output_api, white_list=VIZ_SOURCE_FILES,
+                      black_list=None):
+  errors = []
+
+  source_file_filter = lambda x: input_api.FilterSourceFile(x,
+                                                            white_list,
+                                                            black_list)
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    contents = input_api.ReadFile(f, 'rb')
+    if ('> >') in contents:
+      errors.append(f.LocalPath())
+
+  if errors:
+    return [output_api.PresubmitError('Use >> instead of > >:', items=errors)]
+  return []
+
+def CheckUniquePtr(input_api, output_api,
+                   white_list=VIZ_SOURCE_FILES, black_list=None):
+  black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
+  source_file_filter = lambda x: input_api.FilterSourceFile(x,
+                                                            white_list,
+                                                            black_list)
+  errors = []
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    for line_number, line in f.ChangedContents():
+      # Disallow:
+      # return std::unique_ptr<T>(foo);
+      # bar = std::unique_ptr<T>(foo);
+      # But allow:
+      # return std::unique_ptr<T[]>(foo);
+      # bar = std::unique_ptr<T[]>(foo);
+      if re.search(r'(=|\breturn)\s*std::unique_ptr<.*?(?<!])>\([^)]+\)', line):
+        errors.append(output_api.PresubmitError(
+          ('%s:%d uses explicit std::unique_ptr constructor. ' +
+           'Use base::MakeUnique<T>() instead.') %
+          (f.LocalPath(), line_number)))
+      # Disallow:
+      # std::unique_ptr<T>()
+      if re.search(r'\bstd::unique_ptr<.*?>\(\)', line):
+        errors.append(output_api.PresubmitError(
+          '%s:%d uses std::unique_ptr<T>(). Use nullptr instead.' %
+          (f.LocalPath(), line_number)))
+  return errors
+
+def FindUnquotedQuote(contents, pos):
+  match = re.search(r"(?<!\\)(?P<quote>\")", contents[pos:])
+  return -1 if not match else match.start("quote") + pos
+
+def FindUselessIfdefs(input_api, output_api):
+  errors = []
+  source_file_filter = lambda x: x
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    contents = input_api.ReadFile(f, 'rb')
+    if re.search(r'#if\s*0\s', contents):
+      errors.append(f.LocalPath())
+  if errors:
+    return [output_api.PresubmitError(
+      'Don\'t use #if '+'0; just delete the code.',
+      items=errors)]
+  return []
+
+def FindNamespaceInBlock(pos, namespace, contents, whitelist=[]):
+  open_brace = -1
+  close_brace = -1
+  quote = -1
+  name = -1
+  brace_count = 1
+  quote_count = 0
+  while pos < len(contents) and brace_count > 0:
+    if open_brace < pos: open_brace = contents.find("{", pos)
+    if close_brace < pos: close_brace = contents.find("}", pos)
+    if quote < pos: quote = FindUnquotedQuote(contents, pos)
+    if name < pos: name = contents.find(("%s::" % namespace), pos)
+
+    if name < 0:
+      return False # The namespace is not used at all.
+    if open_brace < 0:
+      open_brace = len(contents)
+    if close_brace < 0:
+      close_brace = len(contents)
+    if quote < 0:
+      quote = len(contents)
+
+    next = min(open_brace, min(close_brace, min(quote, name)))
+
+    if next == open_brace:
+      brace_count += 1
+    elif next == close_brace:
+      brace_count -= 1
+    elif next == quote:
+      quote_count = 0 if quote_count else 1
+    elif next == name and not quote_count:
+      in_whitelist = False
+      for w in whitelist:
+        if re.match(w, contents[next:]):
+          in_whitelist = True
+          break
+      if not in_whitelist:
+        return True
+    pos = next + 1
+  return False
+
+# Checks for the use of viz:: within the viz namespace, which is usually
+# redundant.
+def CheckNamespace(input_api, output_api):
+  errors = []
+
+  source_file_filter = lambda x: x
+  for f in input_api.AffectedSourceFiles(source_file_filter):
+    contents = input_api.ReadFile(f, 'rb')
+    match = re.search(r'namespace\s*viz\s*{', contents)
+    if match:
+      whitelist = []
+      if FindNamespaceInBlock(match.end(), 'viz', contents, whitelist=whitelist):
+        errors.append(f.LocalPath())
+
+  if errors:
+    return [output_api.PresubmitError(
+      'Do not use viz:: inside of the viz namespace.',
+      items=errors)]
+  return []
+
+def CheckForUseOfWrongClock(input_api,
+                            output_api,
+                            white_list=VIZ_SOURCE_FILES,
+                            black_list=None):
+  """Make sure new lines of code don't use a clock susceptible to skew."""
+  black_list = tuple(black_list or input_api.DEFAULT_BLACK_LIST)
+  source_file_filter = lambda x: input_api.FilterSourceFile(x,
+                                                            white_list,
+                                                            black_list)
+  # 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(source_file_filter):
+    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 cc code,\n'
+        'it is most certainly incorrect! Instead use base::TimeTicks.\n\n'
+        '\n'.join(problems))]
+  else:
+    return []
+
+def CheckChangeOnUpload(input_api, output_api):
+  results = []
+  results += CheckAsserts(input_api, output_api)
+  results += CheckStdAbs(input_api, output_api)
+  results += CheckPassByValue(input_api, output_api)
+  results += CheckChangeLintsClean(input_api, output_api)
+  results += CheckTodos(input_api, output_api)
+  results += CheckDoubleAngles(input_api, output_api)
+  results += CheckUniquePtr(input_api, output_api)
+  results += CheckNamespace(input_api, output_api)
+  results += CheckForUseOfWrongClock(input_api, output_api)
+  results += FindUselessIfdefs(input_api, output_api)
+  return results