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cpplint_unittest.py
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#!/usr/bin/python
# -*- coding: utf-8; -*-
#
# Copyright (c) 2009 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.
"""Unit test for cpplint.py."""
# TODO(unknown): Add a good test that tests UpdateIncludeState.
import codecs
import os
import random
import re
import subprocess
import sys
import unittest
import cpplint
try:
xrange # Python 2
except NameError:
xrange = range # Python 3
# This class works as an error collector and replaces cpplint.Error
# function for the unit tests. We also verify each category we see
# is in cpplint._ERROR_CATEGORIES, to help keep that list up to date.
class ErrorCollector(object):
# These are a global list, covering all categories seen ever.
_ERROR_CATEGORIES = cpplint._ERROR_CATEGORIES
_SEEN_ERROR_CATEGORIES = {}
def __init__(self, assert_fn):
"""assert_fn: a function to call when we notice a problem."""
self._assert_fn = assert_fn
self._errors = []
cpplint.ResetNolintSuppressions()
def __call__(self, unused_filename, linenum,
category, confidence, message):
self._assert_fn(category in self._ERROR_CATEGORIES,
'Message "%s" has category "%s",'
' which is not in _ERROR_CATEGORIES' % (message, category))
self._SEEN_ERROR_CATEGORIES[category] = 1
if cpplint._ShouldPrintError(category, confidence, linenum):
self._errors.append('%s [%s] [%d]' % (message, category, confidence))
def Results(self):
if len(self._errors) < 2:
return ''.join(self._errors) # Most tests expect to have a string.
else:
return self._errors # Let's give a list if there is more than one.
def ResultList(self):
return self._errors
def VerifyAllCategoriesAreSeen(self):
"""Fails if there's a category in _ERROR_CATEGORIES~_SEEN_ERROR_CATEGORIES.
This should only be called after all tests are run, so
_SEEN_ERROR_CATEGORIES has had a chance to fully populate. Since
this isn't called from within the normal unittest framework, we
can't use the normal unittest assert macros. Instead we just exit
when we see an error. Good thing this test is always run last!
"""
for category in self._ERROR_CATEGORIES:
if category not in self._SEEN_ERROR_CATEGORIES:
sys.exit('FATAL ERROR: There are no tests for category "%s"' % category)
def RemoveIfPresent(self, substr):
for (index, error) in enumerate(self._errors):
if error.find(substr) != -1:
self._errors = self._errors[0:index] + self._errors[(index + 1):]
break
# This class is a lame mock of codecs. We do not verify filename, mode, or
# encoding, but for the current use case it is not needed.
class MockIo(object):
def __init__(self, mock_file):
self.mock_file = mock_file
def open(self, # pylint: disable-msg=C6409
unused_filename, unused_mode, unused_encoding, _):
return self.mock_file
class CpplintTestBase(unittest.TestCase):
"""Provides some useful helper functions for cpplint tests."""
def setUp(self):
# Allow subclasses to cheat os.path.abspath called in FileInfo class.
self.os_path_abspath_orig = os.path.abspath
def tearDown(self):
os.path.abspath = self.os_path_abspath_orig
# Perform lint on single line of input and return the error message.
def PerformSingleLineLint(self, code):
error_collector = ErrorCollector(self.assertTrue)
lines = code.split('\n')
cpplint.RemoveMultiLineComments('foo.h', lines, error_collector)
clean_lines = cpplint.CleansedLines(lines)
include_state = cpplint._IncludeState()
function_state = cpplint._FunctionState()
nesting_state = cpplint.NestingState()
cpplint.ProcessLine('foo.cc', 'cc', clean_lines, 0,
include_state, function_state,
nesting_state, error_collector)
# Single-line lint tests are allowed to fail the 'unlintable function'
# check.
error_collector.RemoveIfPresent(
'Lint failed to find start of function body.')
return error_collector.Results()
# Perform lint over multiple lines and return the error message.
def PerformMultiLineLint(self, code):
error_collector = ErrorCollector(self.assertTrue)
lines = code.split('\n')
cpplint.RemoveMultiLineComments('foo.h', lines, error_collector)
lines = cpplint.CleansedLines(lines)
nesting_state = cpplint.NestingState()
for i in xrange(lines.NumLines()):
nesting_state.Update('foo.h', lines, i, error_collector)
cpplint.CheckStyle('foo.h', lines, i, 'h', nesting_state,
error_collector)
cpplint.CheckForNonStandardConstructs('foo.h', lines, i,
nesting_state, error_collector)
nesting_state.CheckCompletedBlocks('foo.h', error_collector)
return error_collector.Results()
# Similar to PerformMultiLineLint, but calls CheckLanguage instead of
# CheckForNonStandardConstructs
def PerformLanguageRulesCheck(self, file_name, code):
error_collector = ErrorCollector(self.assertTrue)
include_state = cpplint._IncludeState()
nesting_state = cpplint.NestingState()
lines = code.split('\n')
cpplint.RemoveMultiLineComments(file_name, lines, error_collector)
lines = cpplint.CleansedLines(lines)
ext = file_name[file_name.rfind('.') + 1:]
for i in xrange(lines.NumLines()):
cpplint.CheckLanguage(file_name, lines, i, ext, include_state,
nesting_state, error_collector)
return error_collector.Results()
def PerformFunctionLengthsCheck(self, code):
"""Perform Lint function length check on block of code and return warnings.
Builds up an array of lines corresponding to the code and strips comments
using cpplint functions.
Establishes an error collector and invokes the function length checking
function following cpplint's pattern.
Args:
code: C++ source code expected to generate a warning message.
Returns:
The accumulated errors.
"""
file_name = 'foo.cc'
error_collector = ErrorCollector(self.assertTrue)
function_state = cpplint._FunctionState()
lines = code.split('\n')
cpplint.RemoveMultiLineComments(file_name, lines, error_collector)
lines = cpplint.CleansedLines(lines)
for i in xrange(lines.NumLines()):
cpplint.CheckForFunctionLengths(file_name, lines, i,
function_state, error_collector)
return error_collector.Results()
def PerformIncludeWhatYouUse(self, code, filename='foo.h', io=codecs):
# First, build up the include state.
error_collector = ErrorCollector(self.assertTrue)
include_state = cpplint._IncludeState()
nesting_state = cpplint.NestingState()
lines = code.split('\n')
cpplint.RemoveMultiLineComments(filename, lines, error_collector)
lines = cpplint.CleansedLines(lines)
for i in xrange(lines.NumLines()):
cpplint.CheckLanguage(filename, lines, i, '.h', include_state,
nesting_state, error_collector)
# We could clear the error_collector here, but this should
# also be fine, since our IncludeWhatYouUse unittests do not
# have language problems.
# Second, look for missing includes.
cpplint.CheckForIncludeWhatYouUse(filename, lines, include_state,
error_collector, io)
return error_collector.Results()
# Perform lint and compare the error message with "expected_message".
def TestLint(self, code, expected_message):
self.assertEqual(expected_message, self.PerformSingleLineLint(code))
def TestMultiLineLint(self, code, expected_message):
self.assertEqual(expected_message, self.PerformMultiLineLint(code))
def TestMultiLineLintRE(self, code, expected_message_re):
message = self.PerformMultiLineLint(code)
if not re.search(expected_message_re, message):
self.fail('Message was:\n' + message + 'Expected match to "' +
expected_message_re + '"')
def TestLanguageRulesCheck(self, file_name, code, expected_message):
self.assertEqual(expected_message,
self.PerformLanguageRulesCheck(file_name, code))
def TestIncludeWhatYouUse(self, code, expected_message):
self.assertEqual(expected_message,
self.PerformIncludeWhatYouUse(code))
def TestBlankLinesCheck(self, lines, start_errors, end_errors):
error_collector = ErrorCollector(self.assertTrue)
cpplint.ProcessFileData('foo.cc', 'cc', lines, error_collector)
self.assertEqual(
start_errors,
error_collector.Results().count(
'Redundant blank line at the start of a code block '
'should be deleted. [whitespace/blank_line] [2]'))
self.assertEqual(
end_errors,
error_collector.Results().count(
'Redundant blank line at the end of a code block '
'should be deleted. [whitespace/blank_line] [3]'))
class CpplintTest(CpplintTestBase):
def GetNamespaceResults(self, lines):
error_collector = ErrorCollector(self.assertTrue)
cpplint.RemoveMultiLineComments('foo.h', lines, error_collector)
lines = cpplint.CleansedLines(lines)
nesting_state = cpplint.NestingState()
for i in xrange(lines.NumLines()):
nesting_state.Update('foo.h', lines, i, error_collector)
cpplint.CheckForNamespaceIndentation('foo.h', nesting_state,
lines, i, error_collector)
return error_collector.Results()
def testForwardDeclarationNameSpaceIndentation(self):
lines = ['namespace Test {',
' class ForwardDeclaration;',
'} // namespace Test']
results = self.GetNamespaceResults(lines)
self.assertEqual(results, 'Do not indent within a namespace '
' [runtime/indentation_namespace] [4]')
def testNameSpaceIndentationForClass(self):
lines = ['namespace Test {',
'void foo() { }',
' class Test {',
' };',
'} // namespace Test']
results = self.GetNamespaceResults(lines)
self.assertEqual(results, 'Do not indent within a namespace '
' [runtime/indentation_namespace] [4]')
def testNameSpaceIndentationNoError(self):
lines = ['namespace Test {',
'void foo() { }',
'} // namespace Test']
results = self.GetNamespaceResults(lines)
self.assertEqual(results, '')
def testWhitespaceBeforeNamespace(self):
lines = [' namespace Test {',
' void foo() { }',
' } // namespace Test']
results = self.GetNamespaceResults(lines)
self.assertEqual(results, '')
def testFalsePositivesNoError(self):
lines = ['namespace Test {',
'struct OuterClass {',
' struct NoFalsePositivesHere;',
' struct NoFalsePositivesHere member_variable;',
'};',
'} // namespace Test']
results = self.GetNamespaceResults(lines)
self.assertEqual(results, '')
# Test get line width.
def testGetLineWidth(self):
self.assertEqual(0, cpplint.GetLineWidth(''))
self.assertEqual(10, cpplint.GetLineWidth(u'x' * 10))
self.assertEqual(16, cpplint.GetLineWidth(u'都|道|府|県|支庁'))
self.assertEqual(5 + 13 + 9, cpplint.GetLineWidth(
u'd𝐱/dt' + u'f : t ⨯ 𝐱 → ℝ' + u't ⨯ 𝐱 → ℝ'))
def testGetTextInside(self):
self.assertEqual('', cpplint._GetTextInside('fun()', r'fun\('))
self.assertEqual('x, y', cpplint._GetTextInside('f(x, y)', r'f\('))
self.assertEqual('a(), b(c())', cpplint._GetTextInside(
'printf(a(), b(c()))', r'printf\('))
self.assertEqual('x, y{}', cpplint._GetTextInside('f[x, y{}]', r'f\['))
self.assertEqual(None, cpplint._GetTextInside('f[a, b(}]', r'f\['))
self.assertEqual(None, cpplint._GetTextInside('f[x, y]', r'f\('))
self.assertEqual('y, h(z, (a + b))', cpplint._GetTextInside(
'f(x, g(y, h(z, (a + b))))', r'g\('))
self.assertEqual('f(f(x))', cpplint._GetTextInside('f(f(f(x)))', r'f\('))
# Supports multiple lines.
self.assertEqual('\n return loop(x);\n',
cpplint._GetTextInside(
'int loop(int x) {\n return loop(x);\n}\n', r'\{'))
# '^' matches the beginning of each line.
self.assertEqual('x, y',
cpplint._GetTextInside(
'#include "inl.h" // skip #define\n'
'#define A2(x, y) a_inl_(x, y, __LINE__)\n'
'#define A(x) a_inl_(x, "", __LINE__)\n',
r'^\s*#define\s*\w+\('))
def testFindNextMultiLineCommentStart(self):
self.assertEqual(1, cpplint.FindNextMultiLineCommentStart([''], 0))
lines = ['a', 'b', '/* c']
self.assertEqual(2, cpplint.FindNextMultiLineCommentStart(lines, 0))
lines = ['char a[] = "/*";'] # not recognized as comment.
self.assertEqual(1, cpplint.FindNextMultiLineCommentStart(lines, 0))
def testFindNextMultiLineCommentEnd(self):
self.assertEqual(1, cpplint.FindNextMultiLineCommentEnd([''], 0))
lines = ['a', 'b', ' c */']
self.assertEqual(2, cpplint.FindNextMultiLineCommentEnd(lines, 0))
def testReplaceMultiLineCommentsInRange(self):
lines = [
'a',
' /* comment ',
' * still comment',
' comment */',
'b']
cpplint.ReplaceMultiLineCommentsInRange(None, lines, 1, 4, None)
self.assertEqual([
'a',
' // comment ',
' // * sticomment',
' // comt ./',
'b'],
lines)
def testSpacesAtEndOfLine(self):
self.TestLint(
'// Hello there ',
'Line ends in whitespace. Consider deleting these extra spaces.'
' [whitespace/end_of_line] [4]')
# Test line length check.
def testLineLengthCheck(self):
self.TestLint(
'// Hello',
'')
self.TestLint(
'// x' + ' x' * 40,
'Lines should be <= 80 characters long'
' [whitespace/line_length] [2]')
self.TestLint(
'// x' + ' x' * 50,
'Lines should be <= 80 characters long'
' [whitespace/line_length] [2]')
self.TestLint(
'// //some/path/to/f' + ('i' * 100) + 'le',
'')
self.TestLint(
'// //some/path/to/f' + ('i' * 100) + 'le',
'')
self.TestLint(
'// //some/path/to/f' + ('i' * 50) + 'le and some comments',
'Lines should be <= 80 characters long'
' [whitespace/line_length] [2]')
self.TestLint(
'// http://g' + ('o' * 100) + 'gle.com/',
'')
self.TestLint(
'// https://g' + ('o' * 100) + 'gle.com/',
'')
self.TestLint(
'// https://g' + ('o' * 60) + 'gle.com/ and some comments',
'Lines should be <= 80 characters long'
' [whitespace/line_length] [2]')
self.TestLint(
'// Read https://g' + ('o' * 60) + 'gle.com/',
'')
self.TestLint(
'// $Id: g' + ('o' * 80) + 'gle.cc#1 $',
'')
self.TestLint(
'// $Id: g' + ('o' * 80) + 'gle.cc#1',
'Lines should be <= 80 characters long'
' [whitespace/line_length] [2]')
self.TestMultiLineLint(
'static const char kCStr[] = "g' + ('o' * 50) + 'gle";\n',
'Lines should be <= 80 characters long'
' [whitespace/line_length] [2]')
self.TestMultiLineLint(
'static const char kRawStr[] = R"(g' + ('o' * 50) + 'gle)";\n',
'') # no warning because raw string content is elided
self.TestMultiLineLint(
'static const char kMultiLineRawStr[] = R"(\n'
'g' + ('o' * 80) + 'gle\n'
')";',
'')
self.TestMultiLineLint(
'static const char kL' + ('o' * 50) + 'ngIdentifier[] = R"()";\n',
'Lines should be <= 80 characters long'
' [whitespace/line_length] [2]')
# Test error suppression annotations.
def testErrorSuppression(self):
# Two errors on same line:
self.TestLint(
'long a = (int64) 65;',
['Using C-style cast. Use static_cast<int64>(...) instead'
' [readability/casting] [4]',
'Use int16/int64/etc, rather than the C type long'
' [runtime/int] [4]',
])
# One category of error suppressed:
self.TestLint(
'long a = (int64) 65; // NOLINT(runtime/int)',
'Using C-style cast. Use static_cast<int64>(...) instead'
' [readability/casting] [4]')
# All categories suppressed: (two aliases)
self.TestLint('long a = (int64) 65; // NOLINT', '')
self.TestLint('long a = (int64) 65; // NOLINT(*)', '')
# Malformed NOLINT directive:
self.TestLint(
'long a = 65; // NOLINT(foo)',
['Unknown NOLINT error category: foo'
' [readability/nolint] [5]',
'Use int16/int64/etc, rather than the C type long [runtime/int] [4]',
])
# Irrelevant NOLINT directive has no effect:
self.TestLint(
'long a = 65; // NOLINT(readability/casting)',
'Use int16/int64/etc, rather than the C type long'
' [runtime/int] [4]')
# NOLINTNEXTLINE silences warning for the next line instead of current line
error_collector = ErrorCollector(self.assertTrue)
cpplint.ProcessFileData('test.cc', 'cc',
['// Copyright 2014 Your Company.',
'// NOLINTNEXTLINE(whitespace/line_length)',
'// ./command' + (' -verbose' * 80),
''],
error_collector)
self.assertEqual('', error_collector.Results())
# LINT_C_FILE silences cast warnings for entire file.
error_collector = ErrorCollector(self.assertTrue)
cpplint.ProcessFileData('test.h', 'h',
['// Copyright 2014 Your Company.',
'// NOLINT(build/header_guard)',
'// NOLINT(build/pragma_once)',
'int64 a = (uint64) 65;',
'// LINT_C_FILE',
''],
error_collector)
self.assertEqual('', error_collector.Results())
# Vim modes silence cast warnings for entire file.
for modeline in ['vi:filetype=c',
'vi:sw=8 filetype=c',
'vi:sw=8 filetype=c ts=8',
'vi: filetype=c',
'vi: sw=8 filetype=c',
'vi: sw=8 filetype=c ts=8',
'vim:filetype=c',
'vim:sw=8 filetype=c',
'vim:sw=8 filetype=c ts=8',
'vim: filetype=c',
'vim: sw=8 filetype=c',
'vim: sw=8 filetype=c ts=8',
'vim: set filetype=c:',
'vim: set sw=8 filetype=c:',
'vim: set sw=8 filetype=c ts=8:',
'vim: set filetype=c :',
'vim: set sw=8 filetype=c :',
'vim: set sw=8 filetype=c ts=8 :',
'vim: se filetype=c:',
'vim: se sw=8 filetype=c:',
'vim: se sw=8 filetype=c ts=8:',
'vim: se filetype=c :',
'vim: se sw=8 filetype=c :',
'vim: se sw=8 filetype=c ts=8 :']:
error_collector = ErrorCollector(self.assertTrue)
cpplint.ProcessFileData('test.h', 'h',
['// Copyright 2014 Your Company.',
'// NOLINT(build/header_guard)',
'// NOLINT(build/pragma_once)',
'int64 a = (uint64) 65;',
'// ' + modeline,
''],
error_collector)
self.assertEqual('', error_collector.Results())
# LINT_KERNEL_FILE silences whitespace/tab warnings for entire file.
error_collector = ErrorCollector(self.assertTrue)
cpplint.ProcessFileData('test.h', 'h',
['// Copyright 2014 Your Company.',
'// NOLINT(build/header_guard)',
'// NOLINT(build/pragma_once)',
'struct test {',
'\tint member;',
'};',
'// LINT_KERNEL_FILE',
''],
error_collector)
self.assertEqual('', error_collector.Results())
# NOLINT, NOLINTNEXTLINE silences the readability/braces warning for "};".
error_collector = ErrorCollector(self.assertTrue)
cpplint.ProcessFileData('test.cc', 'cc',
['// Copyright 2014 Your Company.',
'for (int i = 0; i != 100; ++i) {',
'\tstd::cout << i << std::endl;',
'}; // NOLINT',
'for (int i = 0; i != 100; ++i) {',
'\tstd::cout << i << std::endl;',
'// NOLINTNEXTLINE',
'};',
'// LINT_KERNEL_FILE',
''],
error_collector)
self.assertEqual('', error_collector.Results())
# Test Variable Declarations.
def testVariableDeclarations(self):
self.TestLint(
'long a = 65;',
'Use int16/int64/etc, rather than the C type long'
' [runtime/int] [4]')
self.TestLint(
'long double b = 65.0;',
'')
self.TestLint(
'long long aa = 6565;',
'Use int16/int64/etc, rather than the C type long'
' [runtime/int] [4]')
# Test C-style cast cases.
def testCStyleCast(self):
self.TestLint(
'int a = (int)1.0;',
'Using C-style cast. Use static_cast<int>(...) instead'
' [readability/casting] [4]')
self.TestLint(
'int a = (int)-1.0;',
'Using C-style cast. Use static_cast<int>(...) instead'
' [readability/casting] [4]')
self.TestLint(
'int *a = (int *)NULL;',
'Using C-style cast. Use reinterpret_cast<int *>(...) instead'
' [readability/casting] [4]')
self.TestLint(
'uint16 a = (uint16)1.0;',
'Using C-style cast. Use static_cast<uint16>(...) instead'
' [readability/casting] [4]')
self.TestLint(
'int32 a = (int32)1.0;',
'Using C-style cast. Use static_cast<int32>(...) instead'
' [readability/casting] [4]')
self.TestLint(
'uint64 a = (uint64)1.0;',
'Using C-style cast. Use static_cast<uint64>(...) instead'
' [readability/casting] [4]')
# These shouldn't be recognized casts.
self.TestLint('u a = (u)NULL;', '')
self.TestLint('uint a = (uint)NULL;', '')
self.TestLint('typedef MockCallback<int(int)> CallbackType;', '')
self.TestLint('scoped_ptr< MockCallback<int(int)> > callback_value;', '')
self.TestLint('std::function<int(bool)>', '')
self.TestLint('x = sizeof(int)', '')
self.TestLint('x = alignof(int)', '')
self.TestLint('alignas(int) char x[42]', '')
self.TestLint('alignas(alignof(x)) char y[42]', '')
self.TestLint('void F(int (func)(int));', '')
self.TestLint('void F(int (func)(int*));', '')
self.TestLint('void F(int (Class::member)(int));', '')
self.TestLint('void F(int (Class::member)(int*));', '')
self.TestLint('void F(int (Class::member)(int), int param);', '')
self.TestLint('void F(int (Class::member)(int*), int param);', '')
# These should not be recognized (lambda functions without arg names).
self.TestLint('[](int/*unused*/) -> bool {', '')
self.TestLint('[](int /*unused*/) -> bool {', '')
self.TestLint('auto f = [](MyStruct* /*unused*/)->int {', '')
self.TestLint('[](int) -> bool {', '')
self.TestLint('auto f = [](MyStruct*)->int {', '')
# Cast with brace initializers
self.TestLint('int64_t{4096} * 1000 * 1000', '')
self.TestLint('size_t{4096} * 1000 * 1000', '')
self.TestLint('uint_fast16_t{4096} * 1000 * 1000', '')
# Brace initializer with templated type
self.TestMultiLineLint(
"""
template <typename Type1,
typename Type2>
void Function(int arg1,
int arg2) {
variable &= ~Type1{0} - 1;
}""",
'')
self.TestMultiLineLint(
"""
template <typename Type>
class Class {
void Function() {
variable &= ~Type{0} - 1;
}
};""",
'')
self.TestMultiLineLint(
"""
template <typename Type>
class Class {
void Function() {
variable &= ~Type{0} - 1;
}
};""",
'')
self.TestMultiLineLint(
"""
namespace {
template <typename Type>
class Class {
void Function() {
if (block) {
variable &= ~Type{0} - 1;
}
}
};
}""",
'')
# Test taking address of casts (runtime/casting)
def testRuntimeCasting(self):
error_msg = ('Are you taking an address of a cast? '
'This is dangerous: could be a temp var. '
'Take the address before doing the cast, rather than after'
' [runtime/casting] [4]')
self.TestLint('int* x = &static_cast<int*>(foo);', error_msg)
self.TestLint('int* x = &reinterpret_cast<int *>(foo);', error_msg)
self.TestLint('int* x = &(int*)foo;',
['Using C-style cast. Use reinterpret_cast<int*>(...) '
'instead [readability/casting] [4]',
error_msg])
self.TestLint('BudgetBuckets&(BudgetWinHistory::*BucketFn)(void) const;',
'')
self.TestLint('&(*func_ptr)(arg)', '')
self.TestLint('Compute(arg, &(*func_ptr)(i, j));', '')
# Alternative error message
alt_error_msg = ('Are you taking an address of something dereferenced '
'from a cast? Wrapping the dereferenced expression in '
'parentheses will make the binding more obvious'
' [readability/casting] [4]')
self.TestLint('int* x = &down_cast<Obj*>(obj)->member_;', alt_error_msg)
self.TestLint('int* x = &down_cast<Obj*>(obj)[index];', alt_error_msg)
self.TestLint('int* x = &(down_cast<Obj*>(obj)->member_);', '')
self.TestLint('int* x = &(down_cast<Obj*>(obj)[index]);', '')
self.TestLint('int* x = &down_cast<Obj*>(obj)\n->member_;', alt_error_msg)
self.TestLint('int* x = &(down_cast<Obj*>(obj)\n->member_);', '')
# It's OK to cast an address.
self.TestLint('int* x = reinterpret_cast<int *>(&foo);', '')
# Function pointers returning references should not be confused
# with taking address of old-style casts.
self.TestLint('auto x = implicit_cast<string &(*)(int)>(&foo);', '')
def testRuntimeSelfinit(self):
self.TestLint(
'Foo::Foo(Bar r, Bel l) : r_(r_), l_(l_) { }',
'You seem to be initializing a member variable with itself.'
' [runtime/init] [4]')
self.TestLint(
'Foo::Foo(Bar r, Bel l) : r_(CHECK_NOTNULL(r_)) { }',
'You seem to be initializing a member variable with itself.'
' [runtime/init] [4]')
self.TestLint(
'Foo::Foo(Bar r, Bel l) : r_(r), l_(l) { }',
'')
self.TestLint(
'Foo::Foo(Bar r) : r_(r), l_(r_), ll_(l_) { }',
'')
# Test for unnamed arguments in a method.
def testCheckForUnnamedParams(self):
self.TestLint('virtual void Func(int*) const;', '')
self.TestLint('virtual void Func(int*);', '')
self.TestLint('void Method(char*) {', '')
self.TestLint('void Method(char*);', '')
self.TestLint('static void operator delete[](void*) throw();', '')
self.TestLint('int Method(int);', '')
self.TestLint('virtual void Func(int* p);', '')
self.TestLint('void operator delete(void* x) throw();', '')
self.TestLint('void Method(char* x) {', '')
self.TestLint('void Method(char* /*x*/) {', '')
self.TestLint('void Method(char* x);', '')
self.TestLint('typedef void (*Method)(int32 x);', '')
self.TestLint('static void operator delete[](void* x) throw();', '')
self.TestLint('static void operator delete[](void* /*x*/) throw();', '')
self.TestLint('X operator++(int);', '')
self.TestLint('X operator++(int) {', '')
self.TestLint('X operator--(int);', '')
self.TestLint('X operator--(int /*unused*/) {', '')
self.TestLint('MACRO(int);', '')
self.TestLint('MACRO(func(int));', '')
self.TestLint('MACRO(arg, func(int));', '')
self.TestLint('void (*func)(void*);', '')
self.TestLint('void Func((*func)(void*)) {}', '')
self.TestLint('template <void Func(void*)> void func();', '')
self.TestLint('virtual void f(int /*unused*/) {', '')
self.TestLint('void f(int /*unused*/) override {', '')
self.TestLint('void f(int /*unused*/) final {', '')
# Test deprecated casts such as int(d)
def testDeprecatedCast(self):
self.TestLint(
'int a = int(2.2);',
'Using deprecated casting style. '
'Use static_cast<int>(...) instead'
' [readability/casting] [4]')
self.TestLint(
'(char *) "foo"',
'Using C-style cast. '
'Use const_cast<char *>(...) instead'
' [readability/casting] [4]')
self.TestLint(
'(int*)foo',
'Using C-style cast. '
'Use reinterpret_cast<int*>(...) instead'
' [readability/casting] [4]')
# Checks for false positives...
self.TestLint('int a = int();', '') # constructor
self.TestLint('X::X() : a(int()) {}', '') # default constructor
self.TestLint('operator bool();', '') # Conversion operator
self.TestLint('new int64(123);', '') # "new" operator on basic type
self.TestLint('new int64(123);', '') # "new" operator on basic type
self.TestLint('new const int(42);', '') # "new" on const-qualified type
self.TestLint('using a = bool(int arg);', '') # C++11 alias-declaration
self.TestLint('x = bit_cast<double(*)[3]>(y);', '') # array of array
self.TestLint('void F(const char(&src)[N]);', '') # array of references
# Placement new
self.TestLint(
'new(field_ptr) int(field->default_value_enum()->number());',
'')
# C++11 function wrappers
self.TestLint('std::function<int(bool)>', '')
self.TestLint('std::function<const int(bool)>', '')
self.TestLint('std::function< int(bool) >', '')
self.TestLint('mfunction<int(bool)>', '')
error_collector = ErrorCollector(self.assertTrue)
cpplint.ProcessFileData(
'test.cc', 'cc',
['// Copyright 2014 Your Company. All Rights Reserved.',
'typedef std::function<',
' bool(int)> F;',
''],
error_collector)
self.assertEqual('', error_collector.Results())
# Return types for function pointers
self.TestLint('typedef bool(FunctionPointer)();', '')
self.TestLint('typedef bool(FunctionPointer)(int param);', '')
self.TestLint('typedef bool(MyClass::*MemberFunctionPointer)();', '')
self.TestLint('typedef bool(MyClass::* MemberFunctionPointer)();', '')
self.TestLint('typedef bool(MyClass::*MemberFunctionPointer)() const;', '')
self.TestLint('void Function(bool(FunctionPointerArg)());', '')
self.TestLint('void Function(bool(FunctionPointerArg)()) {}', '')
self.TestLint('typedef set<int64, bool(*)(int64, int64)> SortedIdSet', '')
self.TestLint(
'bool TraverseNode(T *Node, bool(VisitorBase:: *traverse) (T *t)) {}',
'')
# The second parameter to a gMock method definition is a function signature
# that often looks like a bad cast but should not picked up by lint.
def testMockMethod(self):
self.TestLint(
'MOCK_METHOD0(method, int());',
'')
self.TestLint(
'MOCK_CONST_METHOD1(method, float(string));',
'')
self.TestLint(
'MOCK_CONST_METHOD2_T(method, double(float, float));',
'')
self.TestLint(
'MOCK_CONST_METHOD1(method, SomeType(int));',
'')
error_collector = ErrorCollector(self.assertTrue)
cpplint.ProcessFileData('mock.cc', 'cc',
['MOCK_METHOD1(method1,',
' bool(int));',
'MOCK_METHOD1(',
' method2,',
' bool(int));',
'MOCK_CONST_METHOD2(',
' method3, bool(int,',
' int));',
'MOCK_METHOD1(method4, int(bool));',
'const int kConstant = int(42);'], # true positive
error_collector)
self.assertEqual(
0,
error_collector.Results().count(
('Using deprecated casting style. '
'Use static_cast<bool>(...) instead '
'[readability/casting] [4]')))
self.assertEqual(
1,
error_collector.Results().count(
('Using deprecated casting style. '
'Use static_cast<int>(...) instead '
'[readability/casting] [4]')))
# Like gMock method definitions, MockCallback instantiations look very similar
# to bad casts.
def testMockCallback(self):
self.TestLint(
'MockCallback<bool(int)>',
'')
self.TestLint(
'MockCallback<int(float, char)>',
'')
# Test false errors that happened with some include file names
def testIncludeFilenameFalseError(self):
self.TestLint(
'#include "foo/long-foo.h"',
'')
self.TestLint(
'#include "foo/sprintf.h"',
'')
# Test typedef cases. There was a bug that cpplint misidentified
# typedef for pointer to function as C-style cast and produced
# false-positive error messages.
def testTypedefForPointerToFunction(self):
self.TestLint(
'typedef void (*Func)(int x);',
'')
self.TestLint(
'typedef void (*Func)(int *x);',
'')
self.TestLint(
'typedef void Func(int x);',
'')
self.TestLint(
'typedef void Func(int *x);',
'')
def testIncludeWhatYouUseNoImplementationFiles(self):
code = 'std::vector<int> foo;'
self.assertEqual('Add #include <vector> for vector<>'
' [build/include_what_you_use] [4]',
self.PerformIncludeWhatYouUse(code, 'foo.h'))
self.assertEqual('',
self.PerformIncludeWhatYouUse(code, 'foo.cc'))
def testIncludeWhatYouUse(self):
self.TestIncludeWhatYouUse(
"""#include <vector>
std::vector<int> foo;
""",
'')
self.TestIncludeWhatYouUse(
"""#include <map>
std::pair<int,int> foo;
""",
'Add #include <utility> for pair<>'
' [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
"""#include <multimap>
std::pair<int,int> foo;
""",
'Add #include <utility> for pair<>'
' [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
"""#include <hash_map>
std::pair<int,int> foo;
""",
'Add #include <utility> for pair<>'
' [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
"""#include <hash_map>
auto foo = std::make_pair(1, 2);
""",
'Add #include <utility> for make_pair'
' [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
"""#include <utility>
std::pair<int,int> foo;
""",
'')
self.TestIncludeWhatYouUse(
"""#include <vector>
DECLARE_string(foobar);
""",
'')
self.TestIncludeWhatYouUse(
"""#include <vector>
DEFINE_string(foobar, "", "");
""",
'')
self.TestIncludeWhatYouUse(
"""#include <vector>
std::pair<int,int> foo;
""",
'Add #include <utility> for pair<>'
' [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
"""#include "base/foobar.h"
std::vector<int> foo;
""",
'Add #include <vector> for vector<>'
' [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
"""#include <vector>
std::set<int> foo;
""",
'Add #include <set> for set<>'
' [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
"""#include "base/foobar.h"
hash_map<int, int> foobar;
""",
'Add #include <hash_map> for hash_map<>'
' [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
"""#include "base/containers/hash_tables.h"
base::hash_map<int, int> foobar;
""",
'')
self.TestIncludeWhatYouUse(
"""#include "base/foobar.h"
bool foobar = std::less<int>(0,1);
""",
'Add #include <functional> for less<>'
' [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
"""#include "base/foobar.h"
bool foobar = min<int>(0,1);
""",
'Add #include <algorithm> for min [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
'void a(const string &foobar);',
'Add #include <string> for string [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(
'void a(const std::string &foobar);',
'Add #include <string> for string [build/include_what_you_use] [4]')
self.TestIncludeWhatYouUse(