diff options
| -rw-r--r-- | LICENSE | 3 | ||||
| -rw-r--r-- | Makefile | 11 | ||||
| -rw-r--r-- | tools/cpplint.py | 3126 |
3 files changed, 3138 insertions, 2 deletions
@@ -37,6 +37,9 @@ are: - tools/closure_linter is copyrighted by The Closure Linter Authors and Google Inc and is released under the Apache license. + - tools/cpplint.py is copyrighted by Google Inc and is released under the + BSD license. + Node's license follows: @@ -130,11 +130,18 @@ bench-idle: sleep 1 ./node benchmark/idle_clients.js & -lint: +# TODO lint the test directories and src/node.js +jslint: @for i in lib/*.js; do \ PYTHONPATH=tools/closure_linter/ python tools/closure_linter/closure_linter/gjslint.py \ --unix_mode --strict --nojsdoc $$i || exit 1; \ done +cpplint: + @for i in src/*.cc src/*.h src/*.c; do \ + python tools/cpplint.py $$i || exit 1; \ + done + +lint: jslint cpplint -.PHONY: lint bench clean docopen docclean doc dist distclean check uninstall install all program staticlib dynamiclib test test-all website-upload +.PHONY: lint cpplint jslint bench clean docopen docclean doc dist distclean check uninstall install all program staticlib dynamiclib test test-all website-upload diff --git a/tools/cpplint.py b/tools/cpplint.py new file mode 100644 index 0000000000..86154ededa --- /dev/null +++ b/tools/cpplint.py @@ -0,0 +1,3126 @@ +#!/usr/bin/python2.4 +# +# 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. + +# Here are some issues that I've had people identify in my code during reviews, +# that I think are possible to flag automatically in a lint tool. If these were +# caught by lint, it would save time both for myself and that of my reviewers. +# Most likely, some of these are beyond the scope of the current lint framework, +# but I think it is valuable to retain these wish-list items even if they cannot +# be immediately implemented. +# +# Suggestions +# ----------- +# - Check for no 'explicit' for multi-arg ctor +# - Check for boolean assign RHS in parens +# - Check for ctor initializer-list colon position and spacing +# - Check that if there's a ctor, there should be a dtor +# - Check accessors that return non-pointer member variables are +# declared const +# - Check accessors that return non-const pointer member vars are +# *not* declared const +# - Check for using public includes for testing +# - Check for spaces between brackets in one-line inline method +# - Check for no assert() +# - Check for spaces surrounding operators +# - Check for 0 in pointer context (should be NULL) +# - Check for 0 in char context (should be '\0') +# - Check for camel-case method name conventions for methods +# that are not simple inline getters and setters +# - Check that base classes have virtual destructors +# put " // namespace" after } that closes a namespace, with +# namespace's name after 'namespace' if it is named. +# - Do not indent namespace contents +# - Avoid inlining non-trivial constructors in header files +# include base/basictypes.h if DISALLOW_EVIL_CONSTRUCTORS is used +# - Check for old-school (void) cast for call-sites of functions +# ignored return value +# - Check gUnit usage of anonymous namespace +# - Check for class declaration order (typedefs, consts, enums, +# ctor(s?), dtor, friend declarations, methods, member vars) +# + +"""Does google-lint on c++ files. + +The goal of this script is to identify places in the code that *may* +be in non-compliance with google style. It does not attempt to fix +up these problems -- the point is to educate. It does also not +attempt to find all problems, or to ensure that everything it does +find is legitimately a problem. + +In particular, we can get very confused by /* and // inside strings! +We do a small hack, which is to ignore //'s with "'s after them on the +same line, but it is far from perfect (in either direction). +""" + +import codecs +import getopt +import math # for log +import os +import re +import sre_compile +import string +import sys +import unicodedata + + +_USAGE = """ +Syntax: cpplint.py [--verbose=#] [--output=vs7] [--filter=-x,+y,...] + [--counting=total|toplevel|detailed] + <file> [file] ... + + The style guidelines this tries to follow are those in + http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml + + Every problem is given a confidence score from 1-5, with 5 meaning we are + certain of the problem, and 1 meaning it could be a legitimate construct. + This will miss some errors, and is not a substitute for a code review. + + To suppress false-positive errors of a certain category, add a + 'NOLINT(category)' comment to the line. NOLINT or NOLINT(*) + suppresses errors of all categories on that line. + + The files passed in will be linted; at least one file must be provided. + Linted extensions are .cc, .cpp, and .h. Other file types will be ignored. + + Flags: + + output=vs7 + By default, the output is formatted to ease emacs parsing. Visual Studio + compatible output (vs7) may also be used. Other formats are unsupported. + + verbose=# + Specify a number 0-5 to restrict errors to certain verbosity levels. + + filter=-x,+y,... + Specify a comma-separated list of category-filters to apply: only + error messages whose category names pass the filters will be printed. + (Category names are printed with the message and look like + "[whitespace/indent]".) Filters are evaluated left to right. + "-FOO" and "FOO" means "do not print categories that start with FOO". + "+FOO" means "do print categories that start with FOO". + + Examples: --filter=-whitespace,+whitespace/braces + --filter=whitespace,runtime/printf,+runtime/printf_format + --filter=-,+build/include_what_you_use + + To see a list of all the categories used in cpplint, pass no arg: + --filter= + + counting=total|toplevel|detailed + The total number of errors found is always printed. If + 'toplevel' is provided, then the count of errors in each of + the top-level categories like 'build' and 'whitespace' will + also be printed. If 'detailed' is provided, then a count + is provided for each category like 'build/class'. +""" + +# We categorize each error message we print. Here are the categories. +# We want an explicit list so we can list them all in cpplint --filter=. +# If you add a new error message with a new category, add it to the list +# here! cpplint_unittest.py should tell you if you forget to do this. +# \ used for clearer layout -- pylint: disable-msg=C6013 +_ERROR_CATEGORIES = [ + 'build/class', + 'build/deprecated', + 'build/endif_comment', + 'build/forward_decl', + 'build/header_guard', + 'build/include', + 'build/include_alpha', + 'build/include_order', + 'build/include_what_you_use', + 'build/namespaces', + 'build/printf_format', + 'build/storage_class', + 'legal/copyright', + 'readability/braces', + 'readability/casting', + 'readability/check', + 'readability/constructors', + 'readability/fn_size', + 'readability/function', + 'readability/multiline_comment', + 'readability/multiline_string', + 'readability/nolint', + 'readability/streams', + 'readability/todo', + 'readability/utf8', + 'runtime/arrays', + 'runtime/casting', + 'runtime/explicit', + 'runtime/int', + 'runtime/init', + 'runtime/invalid_increment', + 'runtime/member_string_references', + 'runtime/memset', + 'runtime/operator', + 'runtime/printf', + 'runtime/printf_format', + 'runtime/references', + 'runtime/rtti', + 'runtime/sizeof', + 'runtime/string', + 'runtime/threadsafe_fn', + 'runtime/virtual', + 'whitespace/blank_line', + 'whitespace/braces', + 'whitespace/comma', + 'whitespace/comments', + 'whitespace/end_of_line', + 'whitespace/ending_newline', + 'whitespace/indent', + 'whitespace/labels', + 'whitespace/line_length', + 'whitespace/newline', + 'whitespace/operators', + 'whitespace/parens', + 'whitespace/semicolon', + 'whitespace/tab', + 'whitespace/todo' + ] + +# The default state of the category filter. This is overrided by the --filter= +# flag. By default all errors are on, so only add here categories that should be +# off by default (i.e., categories that must be enabled by the --filter= flags). +# All entries here should start with a '-' or '+', as in the --filter= flag. +_DEFAULT_FILTERS = [ '-build/include_alpha' ] + +# We used to check for high-bit characters, but after much discussion we +# decided those were OK, as long as they were in UTF-8 and didn't represent +# hard-coded international strings, which belong in a seperate i18n file. + +# Headers that we consider STL headers. +_STL_HEADERS = frozenset([ + 'algobase.h', 'algorithm', 'alloc.h', 'bitset', 'deque', 'exception', + 'function.h', 'functional', 'hash_map', 'hash_map.h', 'hash_set', + 'hash_set.h', 'iterator', 'list', 'list.h', 'map', 'memory', 'new', + 'pair.h', 'pthread_alloc', 'queue', 'set', 'set.h', 'sstream', 'stack', + 'stl_alloc.h', 'stl_relops.h', 'type_traits.h', + 'utility', 'vector', 'vector.h', + ]) + + +# Non-STL C++ system headers. +_CPP_HEADERS = frozenset([ + 'algo.h', 'builtinbuf.h', 'bvector.h', 'cassert', 'cctype', + 'cerrno', 'cfloat', 'ciso646', 'climits', 'clocale', 'cmath', + 'complex', 'complex.h', 'csetjmp', 'csignal', 'cstdarg', 'cstddef', + 'cstdio', 'cstdlib', 'cstring', 'ctime', 'cwchar', 'cwctype', + 'defalloc.h', 'deque.h', 'editbuf.h', 'exception', 'fstream', + 'fstream.h', 'hashtable.h', 'heap.h', 'indstream.h', 'iomanip', + 'iomanip.h', 'ios', 'iosfwd', 'iostream', 'iostream.h', 'istream.h', + 'iterator.h', 'limits', 'map.h', 'multimap.h', 'multiset.h', + 'numeric', 'ostream.h', 'parsestream.h', 'pfstream.h', 'PlotFile.h', + 'procbuf.h', 'pthread_alloc.h', 'rope', 'rope.h', 'ropeimpl.h', + 'SFile.h', 'slist', 'slist.h', 'stack.h', 'stdexcept', + 'stdiostream.h', 'streambuf.h', 'stream.h', 'strfile.h', 'string', + 'strstream', 'strstream.h', 'tempbuf.h', 'tree.h', 'typeinfo', 'valarray', + ]) + + +# Assertion macros. These are defined in base/logging.h and +# testing/base/gunit.h. Note that the _M versions need to come first +# for substring matching to work. +_CHECK_MACROS = [ + 'DCHECK', 'CHECK', + 'EXPECT_TRUE_M', 'EXPECT_TRUE', + 'ASSERT_TRUE_M', 'ASSERT_TRUE', + 'EXPECT_FALSE_M', 'EXPECT_FALSE', + 'ASSERT_FALSE_M', 'ASSERT_FALSE', + ] + +# Replacement macros for CHECK/DCHECK/EXPECT_TRUE/EXPECT_FALSE +_CHECK_REPLACEMENT = dict([(m, {}) for m in _CHECK_MACROS]) + +for op, replacement in [('==', 'EQ'), ('!=', 'NE'), + ('>=', 'GE'), ('>', 'GT'), + ('<=', 'LE'), ('<', 'LT')]: + _CHECK_REPLACEMENT['DCHECK'][op] = 'DCHECK_%s' % replacement + _CHECK_REPLACEMENT['CHECK'][op] = 'CHECK_%s' % replacement + _CHECK_REPLACEMENT['EXPECT_TRUE'][op] = 'EXPECT_%s' % replacement + _CHECK_REPLACEMENT['ASSERT_TRUE'][op] = 'ASSERT_%s' % replacement + _CHECK_REPLACEMENT['EXPECT_TRUE_M'][op] = 'EXPECT_%s_M' % replacement + _CHECK_REPLACEMENT['ASSERT_TRUE_M'][op] = 'ASSERT_%s_M' % replacement + +for op, inv_replacement in [('==', 'NE'), ('!=', 'EQ'), + ('>=', 'LT'), ('>', 'LE'), + ('<=', 'GT'), ('<', 'GE')]: + _CHECK_REPLACEMENT['EXPECT_FALSE'][op] = 'EXPECT_%s' % inv_replacement + _CHECK_REPLACEMENT['ASSERT_FALSE'][op] = 'ASSERT_%s' % inv_replacement + _CHECK_REPLACEMENT['EXPECT_FALSE_M'][op] = 'EXPECT_%s_M' % inv_replacement + _CHECK_REPLACEMENT['ASSERT_FALSE_M'][op] = 'ASSERT_%s_M' % inv_replacement + + +# These constants define types of headers for use with +# _IncludeState.CheckNextIncludeOrder(). +_C_SYS_HEADER = 1 +_CPP_SYS_HEADER = 2 +_LIKELY_MY_HEADER = 3 +_POSSIBLE_MY_HEADER = 4 +_OTHER_HEADER = 5 + + +_regexp_compile_cache = {} + +# Finds occurrences of NOLINT or NOLINT(...). +_RE_SUPPRESSION = re.compile(r'\bNOLINT\b(\([^)]*\))?') + +# {str, set(int)}: a map from error categories to sets of linenumbers +# on which those errors are expected and should be suppressed. +_error_suppressions = {} + +def ParseNolintSuppressions(filename, raw_line, linenum, error): + """Updates the global list of error-suppressions. + + Parses any NOLINT comments on the current line, updating the global + error_suppressions store. Reports an error if the NOLINT comment + was malformed. + + Args: + filename: str, the name of the input file. + raw_line: str, the line of input text, with comments. + linenum: int, the number of the current line. + error: function, an error handler. + """ + # FIXME(adonovan): "NOLINT(" is misparsed as NOLINT(*). + m = _RE_SUPPRESSION.search(raw_line) + if m: + category = m.group(1) + if category in (None, '(*)'): # => "suppress all" + _error_suppressions.setdefault(None, set()).add(linenum) + else: + if category.startswith('(') and category.endswith(')'): + category = category[1:-1] + if category in _ERROR_CATEGORIES: + _error_suppressions.setdefault(category, set()).add(linenum) + else: + error(filename, linenum, 'readability/nolint', 5, + 'Unknown NOLINT error category: %s' % category) + + +def ResetNolintSuppressions(): + "Resets the set of NOLINT suppressions to empty." + _error_suppressions.clear() + + +def IsErrorSuppressedByNolint(category, linenum): + """Returns true if the specified error category is suppressed on this line. + + Consults the global error_suppressions map populated by + ParseNolintSuppressions/ResetNolintSuppressions. + + Args: + category: str, the category of the error. + linenum: int, the current line number. + Returns: + bool, True iff the error should be suppressed due to a NOLINT comment. + """ + return (linenum in _error_suppressions.get(category, set()) or + linenum in _error_suppressions.get(None, set())) + +def Match(pattern, s): + """Matches the string with the pattern, caching the compiled regexp.""" + # The regexp compilation caching is inlined in both Match and Search for + # performance reasons; factoring it out into a separate function turns out + # to be noticeably expensive. + if not pattern in _regexp_compile_cache: + _regexp_compile_cache[pattern] = sre_compile.compile(pattern) + return _regexp_compile_cache[pattern].match(s) + + +def Search(pattern, s): + """Searches the string for the pattern, caching the compiled regexp.""" + if not pattern in _regexp_compile_cache: + _regexp_compile_cache[pattern] = sre_compile.compile(pattern) + return _regexp_compile_cache[pattern].search(s) + + +class _IncludeState(dict): + """Tracks line numbers for includes, and the order in which includes appear. + + As a dict, an _IncludeState object serves as a mapping between include + filename and line number on which that file was included. + + Call CheckNextIncludeOrder() once for each header in the file, passing + in the type constants defined above. Calls in an illegal order will + raise an _IncludeError with an appropriate error message. + + """ + # self._section will move monotonically through this set. If it ever + # needs to move backwards, CheckNextIncludeOrder will raise an error. + _INITIAL_SECTION = 0 + _MY_H_SECTION = 1 + _C_SECTION = 2 + _CPP_SECTION = 3 + _OTHER_H_SECTION = 4 + + _TYPE_NAMES = { + _C_SYS_HEADER: 'C system header', + _CPP_SYS_HEADER: 'C++ system header', + _LIKELY_MY_HEADER: 'header this file implements', + _POSSIBLE_MY_HEADER: 'header this file may implement', + _OTHER_HEADER: 'other header', + } + _SECTION_NAMES = { + _INITIAL_SECTION: "... nothing. (This can't be an error.)", + _MY_H_SECTION: 'a header this file implements', + _C_SECTION: 'C system header', + _CPP_SECTION: 'C++ system header', + _OTHER_H_SECTION: 'other header', + } + + def __init__(self): + dict.__init__(self) + # The name of the current section. + self._section = self._INITIAL_SECTION + # The path of last found header. + self._last_header = '' + + def CanonicalizeAlphabeticalOrder(self, header_path): + """Returns a path canonicalized for alphabetical comparisson. + + - replaces "-" with "_" so they both cmp the same. + - removes '-inl' since we don't require them to be after the main header. + - lowercase everything, just in case. + + Args: + header_path: Path to be canonicalized. + + Returns: + Canonicalized path. + """ + return header_path.replace('-inl.h', '.h').replace('-', '_').lower() + + def IsInAlphabeticalOrder(self, header_path): + """Check if a header is in alphabetical order with the previous header. + + Args: + header_path: Header to be checked. + + Returns: + Returns true if the header is in alphabetical order. + """ + canonical_header = self.CanonicalizeAlphabeticalOrder(header_path) + if self._last_header > canonical_header: + return False + self._last_header = canonical_header + return True + + def CheckNextIncludeOrder(self, header_type): + """Returns a non-empty error message if the next header is out of order. + + This function also updates the internal state to be ready to check + the next include. + + Args: + header_type: One of the _XXX_HEADER constants defined above. + + Returns: + The empty string if the header is in the right order, or an + error message describing what's wrong. + + """ + error_message = ('Found %s after %s' % + (self._TYPE_NAMES[header_type], + self._SECTION_NAMES[self._section])) + + last_section = self._section + + if header_type == _C_SYS_HEADER: + if self._section <= self._C_SECTION: + self._section = self._C_SECTION + else: + self._last_header = '' + return error_message + elif header_type == _CPP_SYS_HEADER: + if self._section <= self._CPP_SECTION: + self._section = self._CPP_SECTION + else: + self._last_header = '' + return error_message + elif header_type == _LIKELY_MY_HEADER: + if self._section <= self._MY_H_SECTION: + self._section = self._MY_H_SECTION + else: + self._section = self._OTHER_H_SECTION + elif header_type == _POSSIBLE_MY_HEADER: + if self._section <= self._MY_H_SECTION: + self._section = self._MY_H_SECTION + else: + # This will always be the fallback because we're not sure + # enough that the header is associated with this file. + self._section = self._OTHER_H_SECTION + else: + assert header_type == _OTHER_HEADER + self._section = self._OTHER_H_SECTION + + if last_section != self._section: + self._last_header = '' + + return '' + + +class _CppLintState(object): + """Maintains module-wide state..""" + + def __init__(self): + self.verbose_level = 1 # global setting. + self.error_count = 0 # global count of reported errors + # filters to apply when emitting error messages + self.filters = _DEFAULT_FILTERS[:] + self.counting = 'total' # In what way are we counting errors? + self.errors_by_category = {} # string to int dict storing error counts + + # output format: + # "emacs" - format that emacs can parse (default) + # "vs7" - format that Microsoft Visual Studio 7 can parse + self.output_format = 'emacs' + + def SetOutputFormat(self, output_format): + """Sets the output format for errors.""" + self.output_format = output_format + + def SetVerboseLevel(self, level): + """Sets the module's verbosity, and returns the previous setting.""" + last_verbose_level = self.verbose_level + self.verbose_level = level + return last_verbose_level + + def SetCountingStyle(self, counting_style): + """Sets the module's counting options.""" + self.counting = counting_style + + def SetFilters(self, filters): + """Sets the error-message filters. + + These filters are applied when deciding whether to emit a given + error message. + + Args: + filters: A string of comma-separated filters (eg "+whitespace/indent"). + Each filter should start with + or -; else we die. + + Raises: + ValueError: The comma-separated filters did not all start with '+' or '-'. + E.g. "-,+whitespace,-whitespace/indent,whitespace/badfilter" + """ + # Default filters always have less priority than the flag ones. + self.filters = _DEFAULT_FILTERS[:] + for filt in filters.split(','): + clean_filt = filt.strip() + if clean_filt: + self.filters.append(clean_filt) + for filt in self.filters: + if not (filt.startswith('+') or filt.startswith('-')): + raise ValueError('Every filter in --filters must start with + or -' + ' (%s does not)' % filt) + + def ResetErrorCounts(self): + """Sets the module's error statistic back to zero.""" + self.error_count = 0 + self.errors_by_category = {} + + def IncrementErrorCount(self, category): + """Bumps the module's error statistic.""" + self.error_count += 1 + if self.counting in ('toplevel', 'detailed'): + if self.counting != 'detailed': + category = category.split('/')[0] + if category not in self.errors_by_category: + self.errors_by_category[category] = 0 + self.errors_by_category[category] += 1 + + def PrintErrorCounts(self): + """Print a summary of errors by category, and the total.""" + for category, count in self.errors_by_category.iteritems(): + sys.stderr.write('Category \'%s\' errors found: %d\n' % + (category, count)) + sys.stderr.write('Total errors found: %d\n' % self.error_count) + +_cpplint_state = _CppLintState() + + +def _OutputFormat(): + """Gets the module's output format.""" + return _cpplint_state.output_format + + +def _SetOutputFormat(output_format): + """Sets the module's output format.""" + _cpplint_state.SetOutputFormat(output_format) + + +def _VerboseLevel(): + """Returns the module's verbosity setting.""" + return _cpplint_state.verbose_level + + +def _SetVerboseLevel(level): + """Sets the module's verbosity, and returns the previous setting.""" + return _cpplint_state.SetVerboseLevel(level) + + +def _SetCountingStyle(level): + """Sets the module's counting options.""" + _cpplint_state.SetCountingStyle(level) + + +def _Filters(): + """Returns the module's list of output filters, as a list.""" + return _cpplint_state.filters + + +def _SetFilters(filters): + """Sets the module's error-message filters. + + These filters are applied when deciding whether to emit a given + error message. + + Args: + filters: A string of comma-separated filters (eg "whitespace/indent"). + Each filter should start with + or -; else we die. + """ + _cpplint_state.SetFilters(filters) + + +class _FunctionState(object): + """Tracks current function name and the number of lines in its body.""" + + _NORMAL_TRIGGER = 250 # for --v=0, 500 for --v=1, etc. + _TEST_TRIGGER = 400 # about 50% more than _NORMAL_TRIGGER. + + def __init__(self): + self.in_a_function = False + self.lines_in_function = 0 + self.current_function = '' + + def Begin(self, function_name): + """Start analyzing function body. + + Args: + function_name: The name of the function being tracked. + """ + self.in_a_function = True + self.lines_in_function = 0 + self.current_function = function_name + + def Count(self): + """Count line in current function body.""" + if self.in_a_function: + self.lines_in_function += 1 + + def Check(self, error, filename, linenum): + """Report if too many lines in function body. + + Args: + error: The function to call with any errors found. + filename: The name of the current file. + linenum: The number of the line to check. + """ + if Match(r'T(EST|est)', self.current_function): + base_trigger = self._TEST_TRIGGER + else: + base_trigger = self._NORMAL_TRIGGER + trigger = base_trigger * 2**_VerboseLevel() + + if self.lines_in_function > trigger: + error_level = int(math.log(self.lines_in_function / base_trigger, 2)) + # 50 => 0, 100 => 1, 200 => 2, 400 => 3, 800 => 4, 1600 => 5, ... + if error_level > 5: + error_level = 5 + error(filename, linenum, 'readability/fn_size', error_level, + 'Small and focused functions are preferred:' + ' %s has %d non-comment lines' + ' (error triggered by exceeding %d lines).' % ( + self.current_function, self.lines_in_function, trigger)) + + def End(self): + """Stop analizing function body.""" + self.in_a_function = False + + +class _IncludeError(Exception): + """Indicates a problem with the include order in a file.""" + pass + + +class FileInfo: + """Provides utility functions for filenames. + + FileInfo provides easy access to the components of a file's path + relative to the project root. + """ + + def __init__(self, filename): + self._filename = filename + + def FullName(self): + """Make Windows paths like Unix.""" + return os.path.abspath(self._filename).replace('\\', '/') + + def RepositoryName(self): + """FullName after removing the local path to the repository. + + If we have a real absolute path name here we can try to do something smart: + detecting the root of the checkout and truncating /path/to/checkout from + the name so that we get header guards that don't include things like + "C:\Documents and Settings\..." or "/home/username/..." in them and thus + people on different computers who have checked the source out to different + locations won't see bogus errors. + """ + fullname = self.FullName() + + if os.path.exists(fullname): + project_dir = os.path.dirname(fullname) + + if os.path.exists(os.path.join(project_dir, ".svn")): + # If there's a .svn file in the current directory, we recursively look + # up the directory tree for the top of the SVN checkout + root_dir = project_dir + one_up_dir = os.path.dirname(root_dir) + while os.path.exists(os.path.join(one_up_dir, ".svn")): + root_dir = os.path.dirname(root_dir) + one_up_dir = os.path.dirname(one_up_dir) + + prefix = os.path.commonprefix([root_dir, project_dir]) + return fullname[len(prefix) + 1:] + + # Not SVN? Try to find a git or hg top level directory by searching up + # from the current path. + root_dir = os.path.dirname(fullname) + while (root_dir != os.path.dirname(root_dir) and + not os.path.exists(os.path.join(root_dir, ".git")) and + not os.path.exists(os.path.join(root_dir, ".hg"))): + root_dir = os.path.dirname(root_dir) + + if (os.path.exists(os.path.join(root_dir, ".git")) or + os.path.exists(os.path.join(root_dir, ".hg"))): + prefix = os.path.commonprefix([root_dir, project_dir]) + return fullname[len(prefix) + 1:] + + # Don't know what to do; header guard warnings may be wrong... + return fullname + + def Split(self): + """Splits the file into the directory, basename, and extension. + + For 'chrome/browser/browser.cc', Split() would + return ('chrome/browser', 'browser', '.cc') + + Returns: + A tuple of (directory, basename, extension). + """ + + googlename = self.RepositoryName() + project, rest = os.path.split(googlename) + return (project,) + os.path.splitext(rest) + + def BaseName(self): + """File base name - text after the final slash, before the final period.""" + return self.Split()[1] + + def Extension(self): + """File extension - text following the final period.""" + return self.Split()[2] + + def NoExtension(self): + """File has no source file extension.""" + return '/'.join(self.Split()[0:2]) + + def IsSource(self): + """File has a source file extension.""" + return self.Extension()[1:] in ('c', 'cc', 'cpp', 'cxx') + + +def _ShouldPrintError(category, confidence, linenum): + """Returns true iff confidence >= verbose, category passes + filter and is not NOLINT-suppressed.""" + + # There are three ways we might decide not to print an error message: + # a "NOLINT(category)" comment appears in the source, + # the verbosity level isn't high enough, or the filters filter it out. + if IsErrorSuppressedByNolint(category, linenum): + return False + if confidence < _cpplint_state.verbose_level: + return False + + is_filtered = False + for one_filter in _Filters(): + if one_filter.startswith('-'): + if category.startswith(one_filter[1:]): + is_filtered = True + elif one_filter.startswith('+'): + if category.startswith(one_filter[1:]): + is_filtered = False + else: + assert False # should have been checked for in SetFilter. + if is_filtered: + return False + + return True + + +def Error(filename, linenum, category, confidence, message): + """Logs the fact we've found a lint error. + + We log where the error was found, and also our confidence in the error, + that is, how certain we are this is a legitimate style regression, and + not a misidentification or a use that's sometimes justified. + + False positives can be suppressed by the use of + "cpplint(category)" comments on the offending line. These are + parsed into _error_suppressions. + + Args: + filename: The name of the file containing the error. + linenum: The number of the line containing the error. + category: A string used to describe the "category" this bug + falls under: "whitespace", say, or "runtime". Categories + may have a hierarchy separated by slashes: "whitespace/indent". + confidence: A number from 1-5 representing a confidence score for + the error, with 5 meaning that we are certain of the problem, + and 1 meaning that it could be a legitimate construct. + message: The error message. + """ + if _ShouldPrintError(category, confidence, linenum): + _cpplint_state.IncrementErrorCount(category) + if _cpplint_state.output_format == 'vs7': + sys.stderr.write('%s(%s): %s [%s] [%d]\n' % ( + filename, linenum, message, category, confidence)) + else: + sys.stderr.write('%s:%s: %s [%s] [%d]\n' % ( + filename, linenum, message, category, confidence)) + + +# Matches standard C++ escape esequences per 2.13.2.3 of the C++ standard. +_RE_PATTERN_CLEANSE_LINE_ESCAPES = re.compile( + r'\\([abfnrtv?"\\\']|\d+|x[0-9a-fA-F]+)') +# Matches strings. Escape codes should already be removed by ESCAPES. +_RE_PATTERN_CLEANSE_LINE_DOUBLE_QUOTES = re.compile(r'"[^"]*"') +# Matches characters. Escape codes should already be removed by ESCAPES. +_RE_PATTERN_CLEANSE_LINE_SINGLE_QUOTES = re.compile(r"'.'") +# Matches multi-line C++ comments. +# This RE is a little bit more complicated than one might expect, because we +# have to take care of space removals tools so we can handle comments inside +# statements better. +# The current rule is: We only clear spaces from both sides when we're at the +# end of the line. Otherwise, we try to remove spaces from the right side, +# if this doesn't work we try on left side but only if there's a non-character +# on the right. +_RE_PATTERN_CLEANSE_LINE_C_COMMENTS = re.compile( + r"""(\s*/\*.*\*/\s*$| + /\*.*\*/\s+| + \s+/\*.*\*/(?=\W)| + /\*.*\*/)""", re.VERBOSE) + + +def IsCppString(line): + """Does line terminate so, that the next symbol is in string constant. + + This function does not consider single-line nor multi-line comments. + + Args: + line: is a partial line of code starting from the 0..n. + + Returns: + True, if next character appended to 'line' is inside a + string constant. + """ + + line = line.replace(r'\\', 'XX') # after this, \\" does not match to \" + return ((line.count('"') - line.count(r'\"') - line.count("'\"'")) & 1) == 1 + + +def FindNextMultiLineCommentStart(lines, lineix): + """Find the beginning marker for a multiline comment.""" + while lineix < len(lines): + if lines[lineix].strip().startswith('/*'): + # Only return this marker if the comment goes beyond this line + if lines[lineix].strip().find('*/', 2) < 0: + return lineix + lineix += 1 + return len(lines) + + +def FindNextMultiLineCommentEnd(lines, lineix): + """We are inside a comment, find the end marker.""" + while lineix < len(lines): + if lines[lineix].strip().endswith('*/'): + return lineix + lineix += 1 + return len(lines) + + +def RemoveMultiLineCommentsFromRange(lines, begin, end): + """Clears a range of lines for multi-line comments.""" + # Having // dummy comments makes the lines non-empty, so we will not get + # unnecessary blank line warnings later in the code. + for i in range(begin, end): + lines[i] = '// dummy' + + +def RemoveMultiLineComments(filename, lines, error): + """Removes multiline (c-style) comments from lines.""" + lineix = 0 + while lineix < len(lines): + lineix_begin = FindNextMultiLineCommentStart(lines, lineix) + if lineix_begin >= len(lines): + return + lineix_end = FindNextMultiLineCommentEnd(lines, lineix_begin) + if lineix_end >= len(lines): + error(filename, lineix_begin + 1, 'readability/multiline_comment', 5, + 'Could not find end of multi-line comment') + return + RemoveMultiLineCommentsFromRange(lines, lineix_begin, lineix_end + 1) + lineix = lineix_end + 1 + + +def CleanseComments(line): + """Removes //-comments and single-line C-style /* */ comments. + + Args: + line: A line of C++ source. + + Returns: + The line with single-line comments removed. + """ + commentpos = line.find('//') + if commentpos != -1 and not IsCppString(line[:commentpos]): + line = line[:commentpos] + # get rid of /* ... */ + return _RE_PATTERN_CLEANSE_LINE_C_COMMENTS.sub('', line) + + +class CleansedLines(object): + """Holds 3 copies of all lines with different preprocessing applied to them. + + 1) elided member contains lines without strings and comments, + 2) lines member contains lines without comments, and + 3) raw member contains all the lines without processing. + All these three members are of <type 'list'>, and of the same length. + """ + + def __init__(self, lines): + self.elided = [] + self.lines = [] + self.raw_lines = lines + self.num_lines = len(lines) + for linenum in range(len(lines)): + self.lines.append(CleanseComments(lines[linenum])) + elided = self._CollapseStrings(lines[linenum]) + self.elided.append(CleanseComments(elided)) + + def NumLines(self): + """Returns the number of lines represented.""" + return self.num_lines + + @staticmethod + def _CollapseStrings(elided): + """Collapses strings and chars on a line to simple "" or '' blocks. + + We nix strings first so we're not fooled by text like '"http://"' + + Args: + elided: The line being processed. + + Returns: + The line with collapsed strings. + """ + if not _RE_PATTERN_INCLUDE.match(elided): + # Remove escaped characters first to make quote/single quote collapsing + # basic. Things that look like escaped characters shouldn't occur + # outside of strings and chars. + elided = _RE_PATTERN_CLEANSE_LINE_ESCAPES.sub('', elided) + elided = _RE_PATTERN_CLEANSE_LINE_SINGLE_QUOTES.sub("''", elided) + elided = _RE_PATTERN_CLEANSE_LINE_DOUBLE_QUOTES.sub('""', elided) + return elided + + +def CloseExpression(clean_lines, linenum, pos): + """If input points to ( or { or [, finds the position that closes it. + + If lines[linenum][pos] points to a '(' or '{' or '[', finds the the + linenum/pos that correspond to the closing of the expression. + + Args: + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + pos: A position on the line. + + Returns: + A tuple (line, linenum, pos) pointer *past* the closing brace, or + (line, len(lines), -1) if we never find a close. Note we ignore + strings and comments when matching; and the line we return is the + 'cleansed' line at linenum. + """ + + line = clean_lines.elided[linenum] + startchar = line[pos] + if startchar not in '({[': + return (line, clean_lines.NumLines(), -1) + if startchar == '(': endchar = ')' + if startchar == '[': endchar = ']' + if startchar == '{': endchar = '}' + + num_open = line.count(startchar) - line.count(endchar) + while linenum < clean_lines.NumLines() and num_open > 0: + linenum += 1 + line = clean_lines.elided[linenum] + num_open += line.count(startchar) - line.count(endchar) + # OK, now find the endchar that actually got us back to even + endpos = len(line) + while num_open >= 0: + endpos = line.rfind(')', 0, endpos) + num_open -= 1 # chopped off another ) + return (line, linenum, endpos + 1) + + +def CheckForCopyright(filename, lines, error): + """Logs an error if no Copyright message appears at the top of the file.""" + + # We'll say it should occur by line 10. Don't forget there's a + # dummy line at the front. + for line in xrange(1, min(len(lines), 11)): + if re.search(r'Copyright', lines[line], re.I): break + else: # means no copyright line was found + error(filename, 0, 'legal/copyright', 5, + 'No copyright message found. ' + 'You should have a line: "Copyright [year] <Copyright Owner>"') + + +def GetHeaderGuardCPPVariable(filename): + """Returns the CPP variable that should be used as a header guard. + + Args: + filename: The name of a C++ header file. + + Returns: + The CPP variable that should be used as a header guard in the + named file. + + """ + + # Restores original filename in case that cpplint is invoked from Emacs's + # flymake. + filename = re.sub(r'_flymake\.h$', '.h', filename) + + fileinfo = FileInfo(filename) + return re.sub(r'[-./\s]', '_', fileinfo.RepositoryName()).upper() + '_' + + +def CheckForHeaderGuard(filename, lines, error): + """Checks that the file contains a header guard. + + Logs an error if no #ifndef header guard is present. For other + headers, checks that the full pathname is used. + + Args: + filename: The name of the C++ header file. + lines: An array of strings, each representing a line of the file. + error: The function to call with any errors found. + """ + + cppvar = GetHeaderGuardCPPVariable(filename) + + ifndef = None + ifndef_linenum = 0 + define = None + endif = None + endif_linenum = 0 + for linenum, line in enumerate(lines): + linesplit = line.split() + if len(linesplit) >= 2: + # find the first occurrence of #ifndef and #define, save arg + if not ifndef and linesplit[0] == '#ifndef': + # set ifndef to the header guard presented on the #ifndef line. + ifndef = linesplit[1] + ifndef_linenum = linenum + if not define and linesplit[0] == '#define': + define = linesplit[1] + # find the last occurrence of #endif, save entire line + if line.startswith('#endif'): + endif = line + endif_linenum = linenum + + if not ifndef or not define or ifndef != define: + error(filename, 0, 'build/header_guard', 5, + 'No #ifndef header guard found, suggested CPP variable is: %s' % + cppvar) + return + + # The guard should be PATH_FILE_H_, but we also allow PATH_FILE_H__ + # for backward compatibility. + if ifndef != cppvar: + error_level = 0 + if ifndef != cppvar + '_': + error_level = 5 + + ParseNolintSuppressions(filename, lines[ifndef_linenum], ifndef_linenum, + error) + error(filename, ifndef_linenum, 'build/header_guard', error_level, + '#ifndef header guard has wrong style, please use: %s' % cppvar) + + if endif != ('#endif // %s' % cppvar): + error_level = 0 + if endif != ('#endif // %s' % (cppvar + '_')): + error_level = 5 + + ParseNolintSuppressions(filename, lines[endif_linenum], endif_linenum, + error) + error(filename, endif_linenum, 'build/header_guard', error_level, + '#endif line should be "#endif // %s"' % cppvar) + + +def CheckForUnicodeReplacementCharacters(filename, lines, error): + """Logs an error for each line containing Unicode replacement characters. + + These indicate that either the file contained invalid UTF-8 (likely) + or Unicode replacement characters (which it shouldn't). Note that + it's possible for this to throw off line numbering if the invalid + UTF-8 occurred adjacent to a newline. + + Args: + filename: The name of the current file. + lines: An array of strings, each representing a line of the file. + error: The function to call with any errors found. + """ + for linenum, line in enumerate(lines): + if u'\ufffd' in line: + error(filename, linenum, 'readability/utf8', 5, + 'Line contains invalid UTF-8 (or Unicode replacement character).') + + +def CheckForNewlineAtEOF(filename, lines, error): + """Logs an error if there is no newline char at the end of the file. + + Args: + filename: The name of the current file. + lines: An array of strings, each representing a line of the file. + error: The function to call with any errors found. + """ + + # The array lines() was created by adding two newlines to the + # original file (go figure), then splitting on \n. + # To verify that the file ends in \n, we just have to make sure the + # last-but-two element of lines() exists and is empty. + if len(lines) < 3 or lines[-2]: + error(filename, len(lines) - 2, 'whitespace/ending_newline', 5, + 'Could not find a newline character at the end of the file.') + + +def CheckForMultilineCommentsAndStrings(filename, clean_lines, linenum, error): + """Logs an error if we see /* ... */ or "..." that extend past one line. + + /* ... */ comments are legit inside macros, for one line. + Otherwise, we prefer // comments, so it's ok to warn about the + other. Likewise, it's ok for strings to extend across multiple + lines, as long as a line continuation character (backslash) + terminates each line. Although not currently prohibited by the C++ + style guide, it's ugly and unnecessary. We don't do well with either + in this lint program, so we warn about both. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + error: The function to call with any errors found. + """ + line = clean_lines.elided[linenum] + + # Remove all \\ (escaped backslashes) from the line. They are OK, and the + # second (escaped) slash may trigger later \" detection erroneously. + line = line.replace('\\\\', '') + + if line.count('/*') > line.count('*/'): + error(filename, linenum, 'readability/multiline_comment', 5, + 'Complex multi-line /*...*/-style comment found. ' + 'Lint may give bogus warnings. ' + 'Consider replacing these with //-style comments, ' + 'with #if 0...#endif, ' + 'or with more clearly structured multi-line comments.') + + if (line.count('"') - line.count('\\"')) % 2: + error(filename, linenum, 'readability/multiline_string', 5, + 'Multi-line string ("...") found. This lint script doesn\'t ' + 'do well with such strings, and may give bogus warnings. They\'re ' + 'ugly and unnecessary, and you should use concatenation instead".') + + +threading_list = ( + ('asctime(', 'asctime_r('), + ('ctime(', 'ctime_r('), + ('getgrgid(', 'getgrgid_r('), + ('getgrnam(', 'getgrnam_r('), + ('getlogin(', 'getlogin_r('), + ('getpwnam(', 'getpwnam_r('), + ('getpwuid(', 'getpwuid_r('), + ('gmtime(', 'gmtime_r('), + ('localtime(', 'localtime_r('), + ('rand(', 'rand_r('), + ('readdir(', 'readdir_r('), + ('strtok(', 'strtok_r('), + ('ttyname(', 'ttyname_r('), + ) + + +def CheckPosixThreading(filename, clean_lines, linenum, error): + """Checks for calls to thread-unsafe functions. + + Much code has been originally written without consideration of + multi-threading. Also, engineers are relying on their old experience; + they have learned posix before threading extensions were added. These + tests guide the engineers to use thread-safe functions (when using + posix directly). + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + error: The function to call with any errors found. + """ + line = clean_lines.elided[linenum] + for single_thread_function, multithread_safe_function in threading_list: + ix = line.find(single_thread_function) + # Comparisons made explicit for clarity -- pylint: disable-msg=C6403 + if ix >= 0 and (ix == 0 or (not line[ix - 1].isalnum() and + line[ix - 1] not in ('_', '.', '>'))): + error(filename, linenum, 'runtime/threadsafe_fn', 2, + 'Consider using ' + multithread_safe_function + + '...) instead of ' + single_thread_function + + '...) for improved thread safety.') + + +# Matches invalid increment: *count++, which moves pointer instead of +# incrementing a value. +_RE_PATTERN_INVALID_INCREMENT = re.compile( + r'^\s*\*\w+(\+\+|--);') + + +def CheckInvalidIncrement(filename, clean_lines, linenum, error): + """Checks for invalid increment *count++. + + For example following function: + void increment_counter(int* count) { + *count++; + } + is invalid, because it effectively does count++, moving pointer, and should + be replaced with ++*count, (*count)++ or *count += 1. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + error: The function to call with any errors found. + """ + line = clean_lines.elided[linenum] + if _RE_PATTERN_INVALID_INCREMENT.match(line): + error(filename, linenum, 'runtime/invalid_increment', 5, + 'Changing pointer instead of value (or unused value of operator*).') + + +class _ClassInfo(object): + """Stores information about a class.""" + + def __init__(self, name, linenum): + self.name = name + self.linenum = linenum + self.seen_open_brace = False + self.is_derived = False + self.virtual_method_linenumber = None + self.has_virtual_destructor = False + self.brace_depth = 0 + + +class _ClassState(object): + """Holds the current state of the parse relating to class declarations. + + It maintains a stack of _ClassInfos representing the parser's guess + as to the current nesting of class declarations. The innermost class + is at the top (back) of the stack. Typically, the stack will either + be empty or have exactly one entry. + """ + + def __init__(self): + self.classinfo_stack = [] + + def CheckFinished(self, filename, error): + """Checks that all classes have been completely parsed. + + Call this when all lines in a file have been processed. + Args: + filename: The name of the current file. + error: The function to call with any errors found. + """ + if self.classinfo_stack: + # Note: This test can result in false positives if #ifdef constructs + # get in the way of brace matching. See the testBuildClass test in + # cpplint_unittest.py for an example of this. + error(filename, self.classinfo_stack[0].linenum, 'build/class', 5, + 'Failed to find complete declaration of class %s' % + self.classinfo_stack[0].name) + + +def CheckForNonStandardConstructs(filename, clean_lines, linenum, + class_state, error): + """Logs an error if we see certain non-ANSI constructs ignored by gcc-2. + + Complain about several constructs which gcc-2 accepts, but which are + not standard C++. Warning about these in lint is one way to ease the + transition to new compilers. + - put storage class first (e.g. "static const" instead of "const static"). + - "%lld" instead of %qd" in printf-type functions. + - "%1$d" is non-standard in printf-type functions. + - "\%" is an undefined character escape sequence. + - text after #endif is not allowed. + - invalid inner-style forward declaration. + - >? and <? operators, and their >?= and <?= cousins. + - classes with virtual methods need virtual destructors (compiler warning + available, but not turned on yet.) + + Additionally, check for constructor/destructor style violations and reference + members, as it is very convenient to do so while checking for + gcc-2 compliance. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + class_state: A _ClassState instance which maintains information about + the current stack of nested class declarations being parsed. + error: A callable to which errors are reported, which takes 4 arguments: + filename, line number, error level, and message + """ + + # Remove comments from the line, but leave in strings for now. + line = clean_lines.lines[linenum] + + if Search(r'printf\s*\(.*".*%[-+ ]?\d*q', line): + error(filename, linenum, 'runtime/printf_format', 3, + '%q in format strings is deprecated. Use %ll instead.') + + if Search(r'printf\s*\(.*".*%\d+\$', line): + error(filename, linenum, 'runtime/printf_format', 2, + '%N$ formats are unconventional. Try rewriting to avoid them.') + + # Remove escaped backslashes before looking for undefined escapes. + line = line.replace('\\\\', '') + + if Search(r'("|\').*\\(%|\[|\(|{)', line): + error(filename, linenum, 'build/printf_format', 3, + '%, [, (, and { are undefined character escapes. Unescape them.') + + # For the rest, work with both comments and strings removed. + line = clean_lines.elided[linenum] + + if Search(r'\b(const|volatile|void|char|short|int|long' + r'|float|double|signed|unsigned' + r'|schar|u?int8|u?int16|u?int32|u?int64)' + r'\s+(auto|register|static|extern|typedef)\b', + line): + error(filename, linenum, 'build/storage_class', 5, + 'Storage class (static, extern, typedef, etc) should be first.') + + if Match(r'\s*#\s*endif\s*[^/\s]+', line): + error(filename, linenum, 'build/endif_comment', 5, + 'Uncommented text after #endif is non-standard. Use a comment.') + + if Match(r'\s*class\s+(\w+\s*::\s*)+\w+\s*;', line): + error(filename, linenum, 'build/forward_decl', 5, + 'Inner-style forward declarations are invalid. Remove this line.') + + if Search(r'(\w+|[+-]?\d+(\.\d*)?)\s*(<|>)\?=?\s*(\w+|[+-]?\d+)(\.\d*)?', + line): + error(filename, linenum, 'build/deprecated', 3, + '>? and <? (max and min) operators are non-standard and deprecated.') + + if Search(r'^\s*const\s*string\s*&\s*\w+\s*;', line): + # TODO(unknown): Could it be expanded safely to arbitrary references, + # without triggering too many false positives? The first + # attempt triggered 5 warnings for mostly benign code in the regtest, hence + # the restriction. + # Here's the original regexp, for the reference: + # type_name = r'\w+((\s*::\s*\w+)|(\s*<\s*\w+?\s*>))?' + # r'\s*const\s*' + type_name + '\s*&\s*\w+\s*;' + error(filename, linenum, 'runtime/member_string_references', 2, + 'const string& members are dangerous. It is much better to use ' + 'alternatives, such as pointers or simple constants.') + + # Track class entry and exit, and attempt to find cases within the + # class declaration that don't meet the C++ style + # guidelines. Tracking is very dependent on the code matching Google + # style guidelines, but it seems to perform well enough in testing + # to be a worthwhile addition to the checks. + classinfo_stack = class_state.classinfo_stack + # Look for a class declaration + class_decl_match = Match( + r'\s*(template\s*<[\w\s<>,:]*>\s*)?(class|struct)\s+(\w+(::\w+)*)', line) + if class_decl_match: + classinfo_stack.append(_ClassInfo(class_decl_match.group(3), linenum)) + + # Everything else in this function uses the top of the stack if it's + # not empty. + if not classinfo_stack: + return + + classinfo = classinfo_stack[-1] + + # If the opening brace hasn't been seen look for it and also + # parent class declarations. + if not classinfo.seen_open_brace: + # If the line has a ';' in it, assume it's a forward declaration or + # a single-line class declaration, which we won't process. + if line.find(';') != -1: + classinfo_stack.pop() + return + classinfo.seen_open_brace = (line.find('{') != -1) + # Look for a bare ':' + if Search('(^|[^:]):($|[^:])', line): + classinfo.is_derived = True + if not classinfo.seen_open_brace: + return # Everything else in this function is for after open brace + + # The class may have been declared with namespace or classname qualifiers. + # The constructor and destructor will not have those qualifiers. + base_classname = classinfo.name.split('::')[-1] + + # Look for single-argument constructors that aren't marked explicit. + # Technically a valid construct, but against style. + args = Match(r'(?<!explicit)\s+%s\s*\(([^,()]+)\)' + % re.escape(base_classname), + line) + if (args and + args.group(1) != 'void' and + not Match(r'(const\s+)?%s\s*&' % re.escape(base_classname), + args.group(1).strip())): + error(filename, linenum, 'runtime/explicit', 5, + 'Single-argument constructors should be marked explicit.') + + # Look for methods declared virtual. + if Search(r'\bvirtual\b', line): + classinfo.virtual_method_linenumber = linenum + # Only look for a destructor declaration on the same line. It would + # be extremely unlikely for the destructor declaration to occupy + # more than one line. + if Search(r'~%s\s*\(' % base_classname, line): + classinfo.has_virtual_destructor = True + + # Look for class end. + brace_depth = classinfo.brace_depth + brace_depth = brace_depth + line.count('{') - line.count('}') + if brace_depth <= 0: + classinfo = classinfo_stack.pop() + # Try to detect missing virtual destructor declarations. + # For now, only warn if a non-derived class with virtual methods lacks + # a virtual destructor. This is to make it less likely that people will + # declare derived virtual destructors without declaring the base + # destructor virtual. + if ((classinfo.virtual_method_linenumber is not None) and + (not classinfo.has_virtual_destructor) and + (not classinfo.is_derived)): # Only warn for base classes + error(filename, classinfo.linenum, 'runtime/virtual', 4, + 'The class %s probably needs a virtual destructor due to ' + 'having virtual method(s), one declared at line %d.' + % (classinfo.name, classinfo.virtual_method_linenumber)) + else: + classinfo.brace_depth = brace_depth + + +def CheckSpacingForFunctionCall(filename, line, linenum, error): + """Checks for the correctness of various spacing around function calls. + + Args: + filename: The name of the current file. + line: The text of the line to check. + linenum: The number of the line to check. + error: The function to call with any errors found. + """ + + # Since function calls often occur inside if/for/while/switch + # expressions - which have their own, more liberal conventions - we + # first see if we should be looking inside such an expression for a + # function call, to which we can apply more strict standards. + fncall = line # if there's no control flow construct, look at whole line + for pattern in (r'\bif\s*\((.*)\)\s*{', + r'\bfor\s*\((.*)\)\s*{', + r'\bwhile\s*\((.*)\)\s*[{;]', + r'\bswitch\s*\((.*)\)\s*{'): + match = Search(pattern, line) + if match: + fncall = match.group(1) # look inside the parens for function calls + break + + # Except in if/for/while/switch, there should never be space + # immediately inside parens (eg "f( 3, 4 )"). We make an exception + # for nested parens ( (a+b) + c ). Likewise, there should never be + # a space before a ( when it's a function argument. I assume it's a + # function argument when the char before the whitespace is legal in + # a function name (alnum + _) and we're not starting a macro. Also ignore + # pointers and references to arrays and functions coz they're too tricky: + # we use a very simple way to recognize these: + # " (something)(maybe-something)" or + # " (something)(maybe-something," or + # " (something)[something]" + # Note that we assume the contents of [] to be short enough that + # they'll never need to wrap. + if ( # Ignore control structures. + not Search(r'\b(if|for|while|switch|return|delete)\b', fncall) and + # Ignore pointers/references to functions. + not Search(r' \([^)]+\)\([^)]*(\)|,$)', fncall) and + # Ignore pointers/references to arrays. + not Search(r' \([^)]+\)\[[^\]]+\]', fncall)): + if Search(r'\w\s*\(\s(?!\s*\\$)', fncall): # a ( used for a fn call + error(filename, linenum, 'whitespace/parens', 4, + 'Extra space after ( in function call') + elif Search(r'\(\s+(?!(\s*\\)|\()', fncall): + error(filename, linenum, 'whitespace/parens', 2, + 'Extra space after (') + if (Search(r'\w\s+\(', fncall) and + not Search(r'#\s*define|typedef', fncall)): + error(filename, linenum, 'whitespace/parens', 4, + 'Extra space before ( in function call') + # If the ) is followed only by a newline or a { + newline, assume it's + # part of a control statement (if/while/etc), and don't complain + if Search(r'[^)]\s+\)\s*[^{\s]', fncall): + error(filename, linenum, 'whitespace/parens', 2, + 'Extra space before )') + + +def IsBlankLine(line): + """Returns true if the given line is blank. + + We consider a line to be blank if the line is empty or consists of + only white spaces. + + Args: + line: A line of a string. + + Returns: + True, if the given line is blank. + """ + return not line or line.isspace() + + +def CheckForFunctionLengths(filename, clean_lines, linenum, + function_state, error): + """Reports for long function bodies. + + For an overview why this is done, see: + http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Write_Short_Functions + + Uses a simplistic algorithm assuming other style guidelines + (especially spacing) are followed. + Only checks unindented functions, so class members are unchecked. + Trivial bodies are unchecked, so constructors with huge initializer lists + may be missed. + Blank/comment lines are not counted so as to avoid encouraging the removal + of vertical space and commments just to get through a lint check. + NOLINT *on the last line of a function* disables this check. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + function_state: Current function name and lines in body so far. + error: The function to call with any errors found. + """ + lines = clean_lines.lines + line = lines[linenum] + raw = clean_lines.raw_lines + raw_line = raw[linenum] + joined_line = '' + + starting_func = False + regexp = r'(\w(\w|::|\*|\&|\s)*)\(' # decls * & space::name( ... + match_result = Match(regexp, line) + if match_result: + # If the name is all caps and underscores, figure it's a macro and + # ignore it, unless it's TEST or TEST_F. + function_name = match_result.group(1).split()[-1] + if function_name == 'TEST' or function_name == 'TEST_F' or ( + not Match(r'[A-Z_]+$', function_name)): + starting_func = True + + if starting_func: + body_found = False + for start_linenum in xrange(linenum, clean_lines.NumLines()): + start_line = lines[start_linenum] + joined_line += ' ' + start_line.lstrip() + if Search(r'(;|})', start_line): # Declarations and trivial functions + body_found = True + break # ... ignore + elif Search(r'{', start_line): + body_found = True + function = Search(r'((\w|:)*)\(', line).group(1) + if Match(r'TEST', function): # Handle TEST... macros + parameter_regexp = Search(r'(\(.*\))', joined_line) + if parameter_regexp: # Ignore bad syntax + function += parameter_regexp.group(1) + else: + function += '()' + function_state.Begin(function) + break + if not body_found: + # No body for the function (or evidence of a non-function) was found. + error(filename, linenum, 'readability/fn_size', 5, + 'Lint failed to find start of function body.') + elif Match(r'^\}\s*$', line): # function end + function_state.Check(error, filename, linenum) + function_state.End() + elif not Match(r'^\s*$', line): + function_state.Count() # Count non-blank/non-comment lines. + + +_RE_PATTERN_TODO = re.compile(r'^//(\s*)TODO(\(.+?\))?:?(\s|$)?') + + +def CheckComment(comment, filename, linenum, error): + """Checks for common mistakes in TODO comments. + + Args: + comment: The text of the comment from the line in question. + filename: The name of the current file. + linenum: The number of the line to check. + error: The function to call with any errors found. + """ + match = _RE_PATTERN_TODO.match(comment) + if match: + # One whitespace is correct; zero whitespace is handled elsewhere. + leading_whitespace = match.group(1) + if len(leading_whitespace) > 1: + error(filename, linenum, 'whitespace/todo', 2, + 'Too many spaces before TODO') + + username = match.group(2) + if not username: + error(filename, linenum, 'readability/todo', 2, + 'Missing username in TODO; it should look like ' + '"// TODO(my_username): Stuff."') + + middle_whitespace = match.group(3) + # Comparisons made explicit for correctness -- pylint: disable-msg=C6403 + if middle_whitespace != ' ' and middle_whitespace != '': + error(filename, linenum, 'whitespace/todo', 2, + 'TODO(my_username) should be followed by a space') + + +def CheckSpacing(filename, clean_lines, linenum, error): + """Checks for the correctness of various spacing issues in the code. + + Things we check for: spaces around operators, spaces after + if/for/while/switch, no spaces around parens in function calls, two + spaces between code and comment, don't start a block with a blank + line, don't end a function with a blank line, don't have too many + blank lines in a row. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + error: The function to call with any errors found. + """ + + raw = clean_lines.raw_lines + line = raw[linenum] + + # Before nixing comments, check if the line is blank for no good + # reason. This includes the first line after a block is opened, and + # blank lines at the end of a function (ie, right before a line like '}' + if IsBlankLine(line): + elided = clean_lines.elided + prev_line = elided[linenum - 1] + prevbrace = prev_line.rfind('{') + # TODO(unknown): Don't complain if line before blank line, and line after, + # both start with alnums and are indented the same amount. + # This ignores whitespace at the start of a namespace block + # because those are not usually indented. + if (prevbrace != -1 and prev_line[prevbrace:].find('}') == -1 + and prev_line[:prevbrace].find('namespace') == -1): + # OK, we have a blank line at the start of a code block. Before we + # complain, we check if it is an exception to the rule: The previous + # non-empty line has the paramters of a function header that are indented + # 4 spaces (because they did not fit in a 80 column line when placed on + # the same line as the function name). We also check for the case where + # the previous line is indented 6 spaces, which may happen when the + # initializers of a constructor do not fit into a 80 column line. + exception = False + if Match(r' {6}\w', prev_line): # Initializer list? + # We are looking for the opening column of initializer list, which + # should be indented 4 spaces to cause 6 space indentation afterwards. + search_position = linenum-2 + while (search_position >= 0 + and Match(r' {6}\w', elided[search_position])): + search_position -= 1 + exception = (search_position >= 0 + and elided[search_position][:5] == ' :') + else: + # Search for the function arguments or an initializer list. We use a + # simple heuristic here: If the line is indented 4 spaces; and we have a + # closing paren, without the opening paren, followed by an opening brace + # or colon (for initializer lists) we assume that it is the last line of + # a function header. If we have a colon indented 4 spaces, it is an + # initializer list. + exception = (Match(r' {4}\w[^\(]*\)\s*(const\s*)?(\{\s*$|:)', + prev_line) + or Match(r' {4}:', prev_line)) + + if not exception: + error(filename, linenum, 'whitespace/blank_line', 2, + 'Blank line at the start of a code block. Is this needed?') + # This doesn't ignore whitespace at the end of a namespace block + # because that is too hard without pairing open/close braces; + # however, a special exception is made for namespace closing + # brackets which have a comment containing "namespace". + # + # Also, ignore blank lines at the end of a block in a long if-else + # chain, like this: + # if (condition1) { + # // Something followed by a blank line + # + # } else if (condition2) { + # // Something else + # } + if linenum + 1 < clean_lines.NumLines(): + next_line = raw[linenum + 1] + if (next_line + and Match(r'\s*}', next_line) + and next_line.find('namespace') == -1 + and next_line.find('} else ') == -1): + error(filename, linenum, 'whitespace/blank_line', 3, + 'Blank line at the end of a code block. Is this needed?') + + # Next, we complain if there's a comment too near the text + commentpos = line.find('//') + if commentpos != -1: + # Check if the // may be in quotes. If so, ignore it + # Comparisons made explicit for clarity -- pylint: disable-msg=C6403 + if (line.count('"', 0, commentpos) - + line.count('\\"', 0, commentpos)) % 2 == 0: # not in quotes + # Allow one space for new scopes, two spaces otherwise: + if (not Match(r'^\s*{ //', line) and + ((commentpos >= 1 and + line[commentpos-1] not in string.whitespace) or + (commentpos >= 2 and + line[commentpos-2] not in string.whitespace))): + error(filename, linenum, 'whitespace/comments', 2, + 'At least two spaces is best between code and comments') + # There should always be a space between the // and the comment + commentend = commentpos + 2 + if commentend < len(line) and not line[commentend] == ' ': + # but some lines are exceptions -- e.g. if they're big + # comment delimiters like: + # //---------------------------------------------------------- + # or are an empty C++ style Doxygen comment, like: + # /// + # or they begin with multiple slashes followed by a space: + # //////// Header comment + match = (Search(r'[=/-]{4,}\s*$', line[commentend:]) or + Search(r'^/$', line[commentend:]) or + Search(r'^/+ ', line[commentend:])) + if not match: + error(filename, linenum, 'whitespace/comments', 4, + 'Should have a space between // and comment') + CheckComment(line[commentpos:], filename, linenum, error) + + line = clean_lines.elided[linenum] # get rid of comments and strings + + # Don't try to do spacing checks for operator methods + line = re.sub(r'operator(==|!=|<|<<|<=|>=|>>|>)\(', 'operator\(', line) + + # We allow no-spaces around = within an if: "if ( (a=Foo()) == 0 )". + # Otherwise not. Note we only check for non-spaces on *both* sides; + # sometimes people put non-spaces on one side when aligning ='s among + # many lines (not that this is behavior that I approve of...) + if Search(r'[\w.]=[\w.]', line) and not Search(r'\b(if|while) ', line): + error(filename, linenum, 'whitespace/operators', 4, + 'Missing spaces around =') + + # It's ok not to have spaces around binary operators like + - * /, but if + # there's too little whitespace, we get concerned. It's hard to tell, + # though, so we punt on this one for now. TODO. + + # You should always have whitespace around binary operators. + # Alas, we can't test < or > because they're legitimately used sans spaces + # (a->b, vector<int> a). The only time we can tell is a < with no >, and + # only if it's not template params list spilling into the next line. + match = Search(r'[^<>=!\s](==|!=|<=|>=)[^<>=!\s]', line) + if not match: + # Note that while it seems that the '<[^<]*' term in the following + # regexp could be simplified to '<.*', which would indeed match + # the same class of strings, the [^<] means that searching for the + # regexp takes linear rather than quadratic time. + if not Search(r'<[^<]*,\s*$', line): # template params spill + match = Search(r'[^<>=!\s](<)[^<>=!\s]([^>]|->)*$', line) + if match: + error(filename, linenum, 'whitespace/operators', 3, + 'Missing spaces around %s' % match.group(1)) + # We allow no-spaces around << and >> when used like this: 10<<20, but + # not otherwise (particularly, not when used as streams) + match = Search(r'[^0-9\s](<<|>>)[^0-9\s]', line) + if match: + error(filename, linenum, 'whitespace/operators', 3, + 'Missing spaces around %s' % match.group(1)) + + # There shouldn't be space around unary operators + match = Search(r'(!\s|~\s|[\s]--[\s;]|[\s]\+\+[\s;])', line) + if match: + error(filename, linenum, 'whitespace/operators', 4, + 'Extra space for operator %s' % match.group(1)) + + # A pet peeve of mine: no spaces after an if, while, switch, or for + match = Search(r' (if\(|for\(|while\(|switch\()', line) + if match: + error(filename, linenum, 'whitespace/parens', 5, + 'Missing space before ( in %s' % match.group(1)) + + # For if/for/while/switch, the left and right parens should be + # consistent about how many spaces are inside the parens, and + # there should either be zero or one spaces inside the parens. + # We don't want: "if ( foo)" or "if ( foo )". + # Exception: "for ( ; foo; bar)" and "for (foo; bar; )" are allowed. + match = Search(r'\b(if|for|while|switch)\s*' + r'\(([ ]*)(.).*[^ ]+([ ]*)\)\s*{\s*$', + line) + if match: + if len(match.group(2)) != len(match.group(4)): + if not (match.group(3) == ';' and + len(match.group(2)) == 1 + len(match.group(4)) or + not match.group(2) and Search(r'\bfor\s*\(.*; \)', line)): + error(filename, linenum, 'whitespace/parens', 5, + 'Mismatching spaces inside () in %s' % match.group(1)) + if not len(match.group(2)) in [0, 1]: + error(filename, linenum, 'whitespace/parens', 5, + 'Should have zero or one spaces inside ( and ) in %s' % + match.group(1)) + + # You should always have a space after a comma (either as fn arg or operator) + if Search(r',[^\s]', line): + error(filename, linenum, 'whitespace/comma', 3, + 'Missing space after ,') + + # Next we will look for issues with function calls. + CheckSpacingForFunctionCall(filename, line, linenum, error) + + # Except after an opening paren, you should have spaces before your braces. + # And since you should never have braces at the beginning of a line, this is + # an easy test. + if Search(r'[^ (]{', line): + error(filename, linenum, 'whitespace/braces', 5, + 'Missing space before {') + + # Make sure '} else {' has spaces. + if Search(r'}else', line): + error(filename, linenum, 'whitespace/braces', 5, + 'Missing space before else') + + # You shouldn't have spaces before your brackets, except maybe after + # 'delete []' or 'new char * []'. + if Search(r'\w\s+\[', line) and not Search(r'delete\s+\[', line): + error(filename, linenum, 'whitespace/braces', 5, + 'Extra space before [') + + # You shouldn't have a space before a semicolon at the end of the line. + # There's a special case for "for" since the style guide allows space before + # the semicolon there. + if Search(r':\s*;\s*$', line): + error(filename, linenum, 'whitespace/semicolon', 5, + 'Semicolon defining empty statement. Use { } instead.') + elif Search(r'^\s*;\s*$', line): + error(filename, linenum, 'whitespace/semicolon', 5, + 'Line contains only semicolon. If this should be an empty statement, ' + 'use { } instead.') + elif (Search(r'\s+;\s*$', line) and + not Search(r'\bfor\b', line)): + error(filename, linenum, 'whitespace/semicolon', 5, + 'Extra space before last semicolon. If this should be an empty ' + 'statement, use { } instead.') + + +def GetPreviousNonBlankLine(clean_lines, linenum): + """Return the most recent non-blank line and its line number. + + Args: + clean_lines: A CleansedLines instance containing the file contents. + linenum: The number of the line to check. + + Returns: + A tuple with two elements. The first element is the contents of the last + non-blank line before the current line, or the empty string if this is the + first non-blank line. The second is the line number of that line, or -1 + if this is the first non-blank line. + """ + + prevlinenum = linenum - 1 + while prevlinenum >= 0: + prevline = clean_lines.elided[prevlinenum] + if not IsBlankLine(prevline): # if not a blank line... + return (prevline, prevlinenum) + prevlinenum -= 1 + return ('', -1) + + +def CheckBraces(filename, clean_lines, linenum, error): + """Looks for misplaced braces (e.g. at the end of line). + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + error: The function to call with any errors found. + """ + + line = clean_lines.elided[linenum] # get rid of comments and strings + + if Match(r'\s*{\s*$', line): + # We allow an open brace to start a line in the case where someone + # is using braces in a block to explicitly create a new scope, + # which is commonly used to control the lifetime of + # stack-allocated variables. We don't detect this perfectly: we + # just don't complain if the last non-whitespace character on the + # previous non-blank line is ';', ':', '{', or '}'. + prevline = GetPreviousNonBlankLine(clean_lines, linenum)[0] + if not Search(r'[;:}{]\s*$', prevline): + error(filename, linenum, 'whitespace/braces', 4, + '{ should almost always be at the end of the previous line') + + # An else clause should be on the same line as the preceding closing brace. + if Match(r'\s*else\s*', line): + prevline = GetPreviousNonBlankLine(clean_lines, linenum)[0] + if Match(r'\s*}\s*$', prevline): + error(filename, linenum, 'whitespace/newline', 4, + 'An else should appear on the same line as the preceding }') + + # If braces come on one side of an else, they should be on both. + # However, we have to worry about "else if" that spans multiple lines! + if Search(r'}\s*else[^{]*$', line) or Match(r'[^}]*else\s*{', line): + if Search(r'}\s*else if([^{]*)$', line): # could be multi-line if + # find the ( after the if + pos = line.find('else if') + pos = line.find('(', pos) + if pos > 0: + (endline, _, endpos) = CloseExpression(clean_lines, linenum, pos) + if endline[endpos:].find('{') == -1: # must be brace after if + error(filename, linenum, 'readability/braces', 5, + 'If an else has a brace on one side, it should have it on both') + else: # common case: else not followed by a multi-line if + error(filename, linenum, 'readability/braces', 5, + 'If an else has a brace on one side, it should have it on both') + + # Likewise, an else should never have the else clause on the same line + if Search(r'\belse [^\s{]', line) and not Search(r'\belse if\b', line): + error(filename, linenum, 'whitespace/newline', 4, + 'Else clause should never be on same line as else (use 2 lines)') + + # In the same way, a do/while should never be on one line + if Match(r'\s*do [^\s{]', line): + error(filename, linenum, 'whitespace/newline', 4, + 'do/while clauses should not be on a single line') + + # Braces shouldn't be followed by a ; unless they're defining a struct + # or initializing an array. + # We can't tell in general, but we can for some common cases. + prevlinenum = linenum + while True: + (prevline, prevlinenum) = GetPreviousNonBlankLine(clean_lines, prevlinenum) + if Match(r'\s+{.*}\s*;', line) and not prevline.count(';'): + line = prevline + line + else: + break + if (Search(r'{.*}\s*;', line) and + line.count('{') == line.count('}') and + not Search(r'struct|class|enum|\s*=\s*{', line)): + error(filename, linenum, 'readability/braces', 4, + "You don't need a ; after a }") + + +def ReplaceableCheck(operator, macro, line): + """Determine whether a basic CHECK can be replaced with a more specific one. + + For example suggest using CHECK_EQ instead of CHECK(a == b) and + similarly for CHECK_GE, CHECK_GT, CHECK_LE, CHECK_LT, CHECK_NE. + + Args: + operator: The C++ operator used in the CHECK. + macro: The CHECK or EXPECT macro being called. + line: The current source line. + + Returns: + True if the CHECK can be replaced with a more specific one. + """ + + # This matches decimal and hex integers, strings, and chars (in that order). + match_constant = r'([-+]?(\d+|0[xX][0-9a-fA-F]+)[lLuU]{0,3}|".*"|\'.*\')' + + # Expression to match two sides of the operator with something that + # looks like a literal, since CHECK(x == iterator) won't compile. + # This means we can't catch all the cases where a more specific + # CHECK is possible, but it's less annoying than dealing with + # extraneous warnings. + match_this = (r'\s*' + macro + r'\((\s*' + + match_constant + r'\s*' + operator + r'[^<>].*|' + r'.*[^<>]' + operator + r'\s*' + match_constant + + r'\s*\))') + + # Don't complain about CHECK(x == NULL) or similar because + # CHECK_EQ(x, NULL) won't compile (requires a cast). + # Also, don't complain about more complex boolean expressions + # involving && or || such as CHECK(a == b || c == d). + return Match(match_this, line) and not Search(r'NULL|&&|\|\|', line) + + +def CheckCheck(filename, clean_lines, linenum, error): + """Checks the use of CHECK and EXPECT macros. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + error: The function to call with any errors found. + """ + + # Decide the set of replacement macros that should be suggested + raw_lines = clean_lines.raw_lines + current_macro = '' + for macro in _CHECK_MACROS: + if raw_lines[linenum].find(macro) >= 0: + current_macro = macro + break + if not current_macro: + # Don't waste time here if line doesn't contain 'CHECK' or 'EXPECT' + return + + line = clean_lines.elided[linenum] # get rid of comments and strings + + # Encourage replacing plain CHECKs with CHECK_EQ/CHECK_NE/etc. + for operator in ['==', '!=', '>=', '>', '<=', '<']: + if ReplaceableCheck(operator, current_macro, line): + error(filename, linenum, 'readability/check', 2, + 'Consider using %s instead of %s(a %s b)' % ( + _CHECK_REPLACEMENT[current_macro][operator], + current_macro, operator)) + break + + +def GetLineWidth(line): + """Determines the width of the line in column positions. + + Args: + line: A string, which may be a Unicode string. + + Returns: + The width of the line in column positions, accounting for Unicode + combining characters and wide characters. + """ + if isinstance(line, unicode): + width = 0 + for c in unicodedata.normalize('NFC', line): + if unicodedata.east_asian_width(c) in ('W', 'F'): + width += 2 + elif not unicodedata.combining(c): + width += 1 + return width + else: + return len(line) + + +def CheckStyle(filename, clean_lines, linenum, file_extension, error): + """Checks rules from the 'C++ style rules' section of cppguide.html. + + Most of these rules are hard to test (naming, comment style), but we + do what we can. In particular we check for 2-space indents, line lengths, + tab usage, spaces inside code, etc. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + file_extension: The extension (without the dot) of the filename. + error: The function to call with any errors found. + """ + + raw_lines = clean_lines.raw_lines + line = raw_lines[linenum] + + if line.find('\t') != -1: + error(filename, linenum, 'whitespace/tab', 1, + 'Tab found; better to use spaces') + + # One or three blank spaces at the beginning of the line is weird; it's + # hard to reconcile that with 2-space indents. + # NOTE: here are the conditions rob pike used for his tests. Mine aren't + # as sophisticated, but it may be worth becoming so: RLENGTH==initial_spaces + # if(RLENGTH > 20) complain = 0; + # if(match($0, " +(error|private|public|protected):")) complain = 0; + # if(match(prev, "&& *$")) complain = 0; + # if(match(prev, "\\|\\| *$")) complain = 0; + # if(match(prev, "[\",=><] *$")) complain = 0; + # if(match($0, " <<")) complain = 0; + # if(match(prev, " +for \\(")) complain = 0; + # if(prevodd && match(prevprev, " +for \\(")) complain = 0; + initial_spaces = 0 + cleansed_line = clean_lines.elided[linenum] + while initial_spaces < len(line) and line[initial_spaces] == ' ': + initial_spaces += 1 + if line and line[-1].isspace(): + error(filename, linenum, 'whitespace/end_of_line', 4, + 'Line ends in whitespace. Consider deleting these extra spaces.') + # There are certain situations we allow one space, notably for labels + elif ((initial_spaces == 1 or initial_spaces == 3) and + not Match(r'\s*\w+\s*:\s*$', cleansed_line)): + error(filename, linenum, 'whitespace/indent', 3, + 'Weird number of spaces at line-start. ' + 'Are you using a 2-space indent?') + # Labels should always be indented at least one space. + elif not initial_spaces and line[:2] != '//' and Search(r'[^:]:\s*$', + line): + error(filename, linenum, 'whitespace/labels', 4, + 'Labels should always be indented at least one space. ' + 'If this is a member-initializer list in a constructor or ' + 'the base class list in a class definition, the colon should ' + 'be on the following line.') + + + # Check if the line is a header guard. + is_header_guard = False + if file_extension == 'h': + cppvar = GetHeaderGuardCPPVariable(filename) + if (line.startswith('#ifndef %s' % cppvar) or + line.startswith('#define %s' % cppvar) or + line.startswith('#endif // %s' % cppvar)): + is_header_guard = True + # #include lines and header guards can be long, since there's no clean way to + # split them. + # + # URLs can be long too. It's possible to split these, but it makes them + # harder to cut&paste. + if (not line.startswith('#include') and not is_header_guard and + not Match(r'^\s*//.*http(s?)://\S*$', line)): + line_width = GetLineWidth(line) + if line_width > 100: + error(filename, linenum, 'whitespace/line_length', 4, + 'Lines should very rarely be longer than 100 characters') + elif line_width > 80: + error(filename, linenum, 'whitespace/line_length', 2, + 'Lines should be <= 80 characters long') + + if (cleansed_line.count(';') > 1 and + # for loops are allowed two ;'s (and may run over two lines). + cleansed_line.find('for') == -1 and + (GetPreviousNonBlankLine(clean_lines, linenum)[0].find('for') == -1 or + GetPreviousNonBlankLine(clean_lines, linenum)[0].find(';') != -1) and + # It's ok to have many commands in a switch case that fits in 1 line + not ((cleansed_line.find('case ') != -1 or + cleansed_line.find('default:') != -1) and + cleansed_line.find('break;') != -1)): + error(filename, linenum, 'whitespace/newline', 4, + 'More than one command on the same line') + + # Some more style checks + CheckBraces(filename, clean_lines, linenum, error) + CheckSpacing(filename, clean_lines, linenum, error) + CheckCheck(filename, clean_lines, linenum, error) + + +_RE_PATTERN_INCLUDE_NEW_STYLE = re.compile(r'#include +"[^/]+\.h"') +_RE_PATTERN_INCLUDE = re.compile(r'^\s*#\s*include\s*([<"])([^>"]*)[>"].*$') +# Matches the first component of a filename delimited by -s and _s. That is: +# _RE_FIRST_COMPONENT.match('foo').group(0) == 'foo' +# _RE_FIRST_COMPONENT.match('foo.cc').group(0) == 'foo' +# _RE_FIRST_COMPONENT.match('foo-bar_baz.cc').group(0) == 'foo' +# _RE_FIRST_COMPONENT.match('foo_bar-baz.cc').group(0) == 'foo' +_RE_FIRST_COMPONENT = re.compile(r'^[^-_.]+') + + +def _DropCommonSuffixes(filename): + """Drops common suffixes like _test.cc or -inl.h from filename. + + For example: + >>> _DropCommonSuffixes('foo/foo-inl.h') + 'foo/foo' + >>> _DropCommonSuffixes('foo/bar/foo.cc') + 'foo/bar/foo' + >>> _DropCommonSuffixes('foo/foo_internal.h') + 'foo/foo' + >>> _DropCommonSuffixes('foo/foo_unusualinternal.h') + 'foo/foo_unusualinternal' + + Args: + filename: The input filename. + + Returns: + The filename with the common suffix removed. + """ + for suffix in ('test.cc', 'regtest.cc', 'unittest.cc', + 'inl.h', 'impl.h', 'internal.h'): + if (filename.endswith(suffix) and len(filename) > len(suffix) and + filename[-len(suffix) - 1] in ('-', '_')): + return filename[:-len(suffix) - 1] + return os.path.splitext(filename)[0] + + +def _IsTestFilename(filename): + """Determines if the given filename has a suffix that identifies it as a test. + + Args: + filename: The input filename. + + Returns: + True if 'filename' looks like a test, False otherwise. + """ + if (filename.endswith('_test.cc') or + filename.endswith('_unittest.cc') or + filename.endswith('_regtest.cc')): + return True + else: + return False + + +def _ClassifyInclude(fileinfo, include, is_system): + """Figures out what kind of header 'include' is. + + Args: + fileinfo: The current file cpplint is running over. A FileInfo instance. + include: The path to a #included file. + is_system: True if the #include used <> rather than "". + + Returns: + One of the _XXX_HEADER constants. + + For example: + >>> _ClassifyInclude(FileInfo('foo/foo.cc'), 'stdio.h', True) + _C_SYS_HEADER + >>> _ClassifyInclude(FileInfo('foo/foo.cc'), 'string', True) + _CPP_SYS_HEADER + >>> _ClassifyInclude(FileInfo('foo/foo.cc'), 'foo/foo.h', False) + _LIKELY_MY_HEADER + >>> _ClassifyInclude(FileInfo('foo/foo_unknown_extension.cc'), + ... 'bar/foo_other_ext.h', False) + _POSSIBLE_MY_HEADER + >>> _ClassifyInclude(FileInfo('foo/foo.cc'), 'foo/bar.h', False) + _OTHER_HEADER + """ + # This is a list of all standard c++ header files, except + # those already checked for above. + is_stl_h = include in _STL_HEADERS + is_cpp_h = is_stl_h or include in _CPP_HEADERS + + if is_system: + if is_cpp_h: + return _CPP_SYS_HEADER + else: + return _C_SYS_HEADER + + # If the target file and the include we're checking share a + # basename when we drop common extensions, and the include + # lives in . , then it's likely to be owned by the target file. + target_dir, target_base = ( + os.path.split(_DropCommonSuffixes(fileinfo.RepositoryName()))) + include_dir, include_base = os.path.split(_DropCommonSuffixes(include)) + if target_base == include_base and ( + include_dir == target_dir or + include_dir == os.path.normpath(target_dir + '/../public')): + return _LIKELY_MY_HEADER + + # If the target and include share some initial basename + # component, it's possible the target is implementing the + # include, so it's allowed to be first, but we'll never + # complain if it's not there. + target_first_component = _RE_FIRST_COMPONENT.match(target_base) + include_first_component = _RE_FIRST_COMPONENT.match(include_base) + if (target_first_component and include_first_component and + target_first_component.group(0) == + include_first_component.group(0)): + return _POSSIBLE_MY_HEADER + + return _OTHER_HEADER + + + +def CheckIncludeLine(filename, clean_lines, linenum, include_state, error): + """Check rules that are applicable to #include lines. + + Strings on #include lines are NOT removed from elided line, to make + certain tasks easier. However, to prevent false positives, checks + applicable to #include lines in CheckLanguage must be put here. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + include_state: An _IncludeState instance in which the headers are inserted. + error: The function to call with any errors found. + """ + fileinfo = FileInfo(filename) + + line = clean_lines.lines[linenum] + + # "include" should use the new style "foo/bar.h" instead of just "bar.h" + if _RE_PATTERN_INCLUDE_NEW_STYLE.search(line): + error(filename, linenum, 'build/include', 4, + 'Include the directory when naming .h files') + + # we shouldn't include a file more than once. actually, there are a + # handful of instances where doing so is okay, but in general it's + # not. + match = _RE_PATTERN_INCLUDE.search(line) + if match: + include = match.group(2) + is_system = (match.group(1) == '<') + if include in include_state: + error(filename, linenum, 'build/include', 4, + '"%s" already included at %s:%s' % + (include, filename, include_state[include])) + else: + include_state[include] = linenum + + # We want to ensure that headers appear in the right order: + # 1) for foo.cc, foo.h (preferred location) + # 2) c system files + # 3) cpp system files + # 4) for foo.cc, foo.h (deprecated location) + # 5) other google headers + # + # We classify each include statement as one of those 5 types + # using a number of techniques. The include_state object keeps + # track of the highest type seen, and complains if we see a + # lower type after that. + error_message = include_state.CheckNextIncludeOrder( + _ClassifyInclude(fileinfo, include, is_system)) + if error_message: + error(filename, linenum, 'build/include_order', 4, + '%s. Should be: %s.h, c system, c++ system, other.' % + (error_message, fileinfo.BaseName())) + if not include_state.IsInAlphabeticalOrder(include): + error(filename, linenum, 'build/include_alpha', 4, + 'Include "%s" not in alphabetical order' % include) + + # Look for any of the stream classes that are part of standard C++. + match = _RE_PATTERN_INCLUDE.match(line) + if match: + include = match.group(2) + if Match(r'(f|ind|io|i|o|parse|pf|stdio|str|)?stream$', include): + # Many unit tests use cout, so we exempt them. + if not _IsTestFilename(filename): + error(filename, linenum, 'readability/streams', 3, + 'Streams are highly discouraged.') + +def CheckLanguage(filename, clean_lines, linenum, file_extension, include_state, + error): + """Checks rules from the 'C++ language rules' section of cppguide.html. + + Some of these rules are hard to test (function overloading, using + uint32 inappropriately), but we do the best we can. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + linenum: The number of the line to check. + file_extension: The extension (without the dot) of the filename. + include_state: An _IncludeState instance in which the headers are inserted. + error: The function to call with any errors found. + """ + # If the line is empty or consists of entirely a comment, no need to + # check it. + line = clean_lines.elided[linenum] + if not line: + return + + match = _RE_PATTERN_INCLUDE.search(line) + if match: + CheckIncludeLine(filename, clean_lines, linenum, include_state, error) + return + + # Create an extended_line, which is the concatenation of the current and + # next lines, for more effective checking of code that may span more than one + # line. + if linenum + 1 < clean_lines.NumLines(): + extended_line = line + clean_lines.elided[linenum + 1] + else: + extended_line = line + + # Make Windows paths like Unix. + fullname = os.path.abspath(filename).replace('\\', '/') + + # TODO(unknown): figure out if they're using default arguments in fn proto. + + # Check for non-const references in functions. This is tricky because & + # is also used to take the address of something. We allow <> for templates, + # (ignoring whatever is between the braces) and : for classes. + # These are complicated re's. They try to capture the following: + # paren (for fn-prototype start), typename, &, varname. For the const + # version, we're willing for const to be before typename or after + # Don't check the implemention on same line. + fnline = line.split('{', 1)[0] + if (len(re.findall(r'\([^()]*\b(?:[\w:]|<[^()]*>)+(\s?&|&\s?)\w+', fnline)) > + len(re.findall(r'\([^()]*\bconst\s+(?:typename\s+)?(?:struct\s+)?' + r'(?:[\w:]|<[^()]*>)+(\s?&|&\s?)\w+', fnline)) + + len(re.findall(r'\([^()]*\b(?:[\w:]|<[^()]*>)+\s+const(\s?&|&\s?)[\w]+', + fnline))): + + # We allow non-const references in a few standard places, like functions + # called "swap()" or iostream operators like "<<" or ">>". + if not Search( + r'(swap|Swap|operator[<>][<>])\s*\(\s*(?:[\w:]|<.*>)+\s*&', + fnline): + error(filename, linenum, 'runtime/references', 2, + 'Is this a non-const reference? ' + 'If so, make const or use a pointer.') + + # Check to see if they're using an conversion function cast. + # I just try to capture the most common basic types, though there are more. + # Parameterless conversion functions, such as bool(), are allowed as they are + # probably a member operator declaration or default constructor. + match = Search( + r'(\bnew\s+)?\b' # Grab 'new' operator, if it's there + r'(int|float|double|bool|char|int32|uint32|int64|uint64)\([^)]', line) + if match: + # gMock methods are defined using some variant of MOCK_METHODx(name, type) + # where type may be float(), int(string), etc. Without context they are + # virtually indistinguishable from int(x) casts. + if (match.group(1) is None and # If new operator, then this isn't a cast + not Match(r'^\s*MOCK_(CONST_)?METHOD\d+(_T)?\(', line)): + error(filename, linenum, 'readability/casting', 4, + 'Using deprecated casting style. ' + 'Use static_cast<%s>(...) instead' % + match.group(2)) + + CheckCStyleCast(filename, linenum, line, clean_lines.raw_lines[linenum], + 'static_cast', + r'\((int|float|double|bool|char|u?int(16|32|64))\)', + error) + # This doesn't catch all cases. Consider (const char * const)"hello". + CheckCStyleCast(filename, linenum, line, clean_lines.raw_lines[linenum], + 'reinterpret_cast', r'\((\w+\s?\*+\s?)\)', error) + + # In addition, we look for people taking the address of a cast. This + # is dangerous -- casts can assign to temporaries, so the pointer doesn't + # point where you think. + if Search( + r'(&\([^)]+\)[\w(])|(&(static|dynamic|reinterpret)_cast\b)', line): + error(filename, linenum, 'runtime/casting', 4, + ('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')) + + # Check for people declaring static/global STL strings at the top level. + # This is dangerous because the C++ language does not guarantee that + # globals with constructors are initialized before the first access. + match = Match( + r'((?:|static +)(?:|const +))string +([a-zA-Z0-9_:]+)\b(.*)', + line) + # Make sure it's not a function. + # Function template specialization looks like: "string foo<Type>(...". + # Class template definitions look like: "string Foo<Type>::Method(...". + if match and not Match(r'\s*(<.*>)?(::[a-zA-Z0-9_]+)?\s*\(([^"]|$)', + match.group(3)): + error(filename, linenum, 'runtime/string', 4, + 'For a static/global string constant, use a C style string instead: ' + '"%schar %s[]".' % + (match.group(1), match.group(2))) + + # Check that we're not using RTTI outside of testing code. + if Search(r'\bdynamic_cast<', line) and not _IsTestFilename(filename): + error(filename, linenum, 'runtime/rtti', 5, + 'Do not use dynamic_cast<>. If you need to cast within a class ' + "hierarchy, use static_cast<> to upcast. Google doesn't support " + 'RTTI.') + + if Search(r'\b([A-Za-z0-9_]*_)\(\1\)', line): + error(filename, linenum, 'runtime/init', 4, + 'You seem to be initializing a member variable with itself.') + + if file_extension == 'h': + # TODO(unknown): check that 1-arg constructors are explicit. + # How to tell it's a constructor? + # (handled in CheckForNonStandardConstructs for now) + # TODO(unknown): check that classes have DISALLOW_EVIL_CONSTRUCTORS + # (level 1 error) + pass + + # Check if people are using the verboten C basic types. The only exception + # we regularly allow is "unsigned short port" for port. + if Search(r'\bshort port\b', line): + if not Search(r'\bunsigned short port\b', line): + error(filename, linenum, 'runtime/int', 4, + 'Use "unsigned short" for ports, not "short"') + else: + match = Search(r'\b(short|long(?! +double)|long long)\b', line) + if match: + error(filename, linenum, 'runtime/int', 4, + 'Use int16/int64/etc, rather than the C type %s' % match.group(1)) + + # When snprintf is used, the second argument shouldn't be a literal. + match = Search(r'snprintf\s*\(([^,]*),\s*([0-9]*)\s*,', line) + if match and match.group(2) != '0': + # If 2nd arg is zero, snprintf is used to calculate size. + error(filename, linenum, 'runtime/printf', 3, + 'If you can, use sizeof(%s) instead of %s as the 2nd arg ' + 'to snprintf.' % (match.group(1), match.group(2))) + + # Check if some verboten C functions are being used. + if Search(r'\bsprintf\b', line): + error(filename, linenum, 'runtime/printf', 5, + 'Never use sprintf. Use snprintf instead.') + match = Search(r'\b(strcpy|strcat)\b', line) + if match: + error(filename, linenum, 'runtime/printf', 4, + 'Almost always, snprintf is better than %s' % match.group(1)) + + if Search(r'\bsscanf\b', line): + error(filename, linenum, 'runtime/printf', 1, + 'sscanf can be ok, but is slow and can overflow buffers.') + + # Check if some verboten operator overloading is going on + # TODO(unknown): catch out-of-line unary operator&: + # class X {}; + # int operator&(const X& x) { return 42; } // unary operator& + # The trick is it's hard to tell apart from binary operator&: + # class Y { int operator&(const Y& x) { return 23; } }; // binary operator& + if Search(r'\boperator\s*&\s*\(\s*\)', line): + error(filename, linenum, 'runtime/operator', 4, + 'Unary operator& is dangerous. Do not use it.') + + # Check for suspicious usage of "if" like + # } if (a == b) { + if Search(r'\}\s*if\s*\(', line): + error(filename, linenum, 'readability/braces', 4, + 'Did you mean "else if"? If not, start a new line for "if".') + + # Check for potential format string bugs like printf(foo). + # We constrain the pattern not to pick things like DocidForPrintf(foo). + # Not perfect but it can catch printf(foo.c_str()) and printf(foo->c_str()) + match = re.search(r'\b((?:string)?printf)\s*\(([\w.\->()]+)\)', line, re.I) + if match: + error(filename, linenum, 'runtime/printf', 4, + 'Potential format string bug. Do %s("%%s", %s) instead.' + % (match.group(1), match.group(2))) + + # Check for potential memset bugs like memset(buf, sizeof(buf), 0). + match = Search(r'memset\s*\(([^,]*),\s*([^,]*),\s*0\s*\)', line) + if match and not Match(r"^''|-?[0-9]+|0x[0-9A-Fa-f]$", match.group(2)): + error(filename, linenum, 'runtime/memset', 4, + 'Did you mean "memset(%s, 0, %s)"?' + % (match.group(1), match.group(2))) + + if Search(r'\busing namespace\b', line): + error(filename, linenum, 'build/namespaces', 5, + 'Do not use namespace using-directives. ' + 'Use using-declarations instead.') + + # Detect variable-length arrays. + match = Match(r'\s*(.+::)?(\w+) [a-z]\w*\[(.+)];', line) + if (match and match.group(2) != 'return' and match.group(2) != 'delete' and + match.group(3).find(']') == -1): + # Split the size using space and arithmetic operators as delimiters. + # If any of the resulting tokens are not compile time constants then + # report the error. + tokens = re.split(r'\s|\+|\-|\*|\/|<<|>>]', match.group(3)) + is_const = True + skip_next = False + for tok in tokens: + if skip_next: + skip_next = False + continue + + if Search(r'sizeof\(.+\)', tok): continue + if Search(r'arraysize\(\w+\)', tok): continue + + tok = tok.lstrip('(') + tok = tok.rstrip(')') + if not tok: continue + if Match(r'\d+', tok): continue + if Match(r'0[xX][0-9a-fA-F]+', tok): continue + if Match(r'k[A-Z0-9]\w*', tok): continue + if Match(r'(.+::)?k[A-Z0-9]\w*', tok): continue + if Match(r'(.+::)?[A-Z][A-Z0-9_]*', tok): continue + # A catch all for tricky sizeof cases, including 'sizeof expression', + # 'sizeof(*type)', 'sizeof(const type)', 'sizeof(struct StructName)' + # requires skipping the next token becasue we split on ' ' and '*'. + if tok.startswith('sizeof'): + skip_next = True + continue + is_const = False + break + if not is_const: + error(filename, linenum, 'runtime/arrays', 1, + 'Do not use variable-length arrays. Use an appropriately named ' + "('k' followed by CamelCase) compile-time constant for the size.") + + # If DISALLOW_EVIL_CONSTRUCTORS, DISALLOW_COPY_AND_ASSIGN, or + # DISALLOW_IMPLICIT_CONSTRUCTORS is present, then it should be the last thing + # in the class declaration. + match = Match( + (r'\s*' + r'(DISALLOW_(EVIL_CONSTRUCTORS|COPY_AND_ASSIGN|IMPLICIT_CONSTRUCTORS))' + r'\(.*\);$'), + line) + if match and linenum + 1 < clean_lines.NumLines(): + next_line = clean_lines.elided[linenum + 1] + if not Search(r'^\s*};', next_line): + error(filename, linenum, 'readability/constructors', 3, + match.group(1) + ' should be the last thing in the class') + + # Check for use of unnamed namespaces in header files. Registration + # macros are typically OK, so we allow use of "namespace {" on lines + # that end with backslashes. + if (file_extension == 'h' + and Search(r'\bnamespace\s*{', line) + and line[-1] != '\\'): + error(filename, linenum, 'build/namespaces', 4, + 'Do not use unnamed namespaces in header files. See ' + 'http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Namespaces' + ' for more information.') + + +def CheckCStyleCast(filename, linenum, line, raw_line, cast_type, pattern, + error): + """Checks for a C-style cast by looking for the pattern. + + This also handles sizeof(type) warnings, due to similarity of content. + + Args: + filename: The name of the current file. + linenum: The number of the line to check. + line: The line of code to check. + raw_line: The raw line of code to check, with comments. + cast_type: The string for the C++ cast to recommend. This is either + reinterpret_cast or static_cast, depending. + pattern: The regular expression used to find C-style casts. + error: The function to call with any errors found. + """ + match = Search(pattern, line) + if not match: + return + + # e.g., sizeof(int) + sizeof_match = Match(r'.*sizeof\s*$', line[0:match.start(1) - 1]) + if sizeof_match: + error(filename, linenum, 'runtime/sizeof', 1, + 'Using sizeof(type). Use sizeof(varname) instead if possible') + return + + remainder = line[match.end(0):] + + # The close paren is for function pointers as arguments to a function. + # eg, void foo(void (*bar)(int)); + # The semicolon check is a more basic function check; also possibly a + # function pointer typedef. + # eg, void foo(int); or void foo(int) const; + # The equals check is for function pointer assignment. + # eg, void *(*foo)(int) = ... + # + # Right now, this will only catch cases where there's a single argument, and + # it's unnamed. It should probably be expanded to check for multiple + # arguments with some unnamed. + function_match = Match(r'\s*(\)|=|(const)?\s*(;|\{|throw\(\)))', remainder) + if function_match: + if (not function_match.group(3) or + function_match.group(3) == ';' or + raw_line.find('/*') < 0): + error(filename, linenum, 'readability/function', 3, + 'All parameters should be named in a function') + return + + # At this point, all that should be left is actual casts. + error(filename, linenum, 'readability/casting', 4, + 'Using C-style cast. Use %s<%s>(...) instead' % + (cast_type, match.group(1))) + + +_HEADERS_CONTAINING_TEMPLATES = ( + ('<deque>', ('deque',)), + ('<functional>', ('unary_function', 'binary_function', + 'plus', 'minus', 'multiplies', 'divides', 'modulus', + 'negate', + 'equal_to', 'not_equal_to', 'greater', 'less', + 'greater_equal', 'less_equal', + 'logical_and', 'logical_or', 'logical_not', + 'unary_negate', 'not1', 'binary_negate', 'not2', + 'bind1st', 'bind2nd', + 'pointer_to_unary_function', + 'pointer_to_binary_function', + 'ptr_fun', + 'mem_fun_t', 'mem_fun', 'mem_fun1_t', 'mem_fun1_ref_t', + 'mem_fun_ref_t', + 'const_mem_fun_t', 'const_mem_fun1_t', + 'const_mem_fun_ref_t', 'const_mem_fun1_ref_t', + 'mem_fun_ref', + )), + ('<limits>', ('numeric_limits',)), + ('<list>', ('list',)), + ('<map>', ('map', 'multimap',)), + ('<memory>', ('allocator',)), + ('<queue>', ('queue', 'priority_queue',)), + ('<set>', ('set', 'multiset',)), + ('<stack>', ('stack',)), + ('<string>', ('char_traits', 'basic_string',)), + ('<utility>', ('pair',)), + ('<vector>', ('vector',)), + + # gcc extensions. + # Note: std::hash is their hash, ::hash is our hash + ('<hash_map>', ('hash_map', 'hash_multimap',)), + ('<hash_set>', ('hash_set', 'hash_multiset',)), + ('<slist>', ('slist',)), + ) + +_HEADERS_ACCEPTED_BUT_NOT_PROMOTED = { + # We can trust with reasonable confidence that map gives us pair<>, too. + 'pair<>': ('map', 'multimap', 'hash_map', 'hash_multimap') +} + +_RE_PATTERN_STRING = re.compile(r'\bstring\b') + +_re_pattern_algorithm_header = [] +for _template in ('copy', 'max', 'min', 'min_element', 'sort', 'swap', + 'transform'): + # Match max<type>(..., ...), max(..., ...), but not foo->max, foo.max or + # type::max(). + _re_pattern_algorithm_header.append( + (re.compile(r'[^>.]\b' + _template + r'(<.*?>)?\([^\)]'), + _template, + '<algorithm>')) + +_re_pattern_templates = [] +for _header, _templates in _HEADERS_CONTAINING_TEMPLATES: + for _template in _templates: + _re_pattern_templates.append( + (re.compile(r'(\<|\b)' + _template + r'\s*\<'), + _template + '<>', + _header)) + + +def FilesBelongToSameModule(filename_cc, filename_h): + """Check if these two filenames belong to the same module. + + The concept of a 'module' here is a as follows: + foo.h, foo-inl.h, foo.cc, foo_test.cc and foo_unittest.cc belong to the + same 'module' if they are in the same directory. + some/path/public/xyzzy and some/path/internal/xyzzy are also considered + to belong to the same module here. + + If the filename_cc contains a longer path than the filename_h, for example, + '/absolute/path/to/base/sysinfo.cc', and this file would include + 'base/sysinfo.h', this function also produces the prefix needed to open the + header. This is used by the caller of this function to more robustly open the + header file. We don't have access to the real include paths in this context, + so we need this guesswork here. + + Known bugs: tools/base/bar.cc and base/bar.h belong to the same module + according to this implementation. Because of this, this function gives + some false positives. This should be sufficiently rare in practice. + + Args: + filename_cc: is the path for the .cc file + filename_h: is the path for the header path + + Returns: + Tuple with a bool and a string: + bool: True if filename_cc and filename_h belong to the same module. + string: the additional prefix needed to open the header file. + """ + + if not filename_cc.endswith('.cc'): + return (False, '') + filename_cc = filename_cc[:-len('.cc')] + if filename_cc.endswith('_unittest'): + filename_cc = filename_cc[:-len('_unittest')] + elif filename_cc.endswith('_test'): + filename_cc = filename_cc[:-len('_test')] + filename_cc = filename_cc.replace('/public/', '/') + filename_cc = filename_cc.replace('/internal/', '/') + + if not filename_h.endswith('.h'): + return (False, '') + filename_h = filename_h[:-len('.h')] + if filename_h.endswith('-inl'): + filename_h = filename_h[:-len('-inl')] + filename_h = filename_h.replace('/public/', '/') + filename_h = filename_h.replace('/internal/', '/') + + files_belong_to_same_module = filename_cc.endswith(filename_h) + common_path = '' + if files_belong_to_same_module: + common_path = filename_cc[:-len(filename_h)] + return files_belong_to_same_module, common_path + + +def UpdateIncludeState(filename, include_state, io=codecs): + """Fill up the include_state with new includes found from the file. + + Args: + filename: the name of the header to read. + include_state: an _IncludeState instance in which the headers are inserted. + io: The io factory to use to read the file. Provided for testability. + + Returns: + True if a header was succesfully added. False otherwise. + """ + headerfile = None + try: + headerfile = io.open(filename, 'r', 'utf8', 'replace') + except IOError: + return False + linenum = 0 + for line in headerfile: + linenum += 1 + clean_line = CleanseComments(line) + match = _RE_PATTERN_INCLUDE.search(clean_line) + if match: + include = match.group(2) + # The value formatting is cute, but not really used right now. + # What matters here is that the key is in include_state. + include_state.setdefault(include, '%s:%d' % (filename, linenum)) + return True + + +def CheckForIncludeWhatYouUse(filename, clean_lines, include_state, error, + io=codecs): + """Reports for missing stl includes. + + This function will output warnings to make sure you are including the headers + necessary for the stl containers and functions that you use. We only give one + reason to include a header. For example, if you use both equal_to<> and + less<> in a .h file, only one (the latter in the file) of these will be + reported as a reason to include the <functional>. + + Args: + filename: The name of the current file. + clean_lines: A CleansedLines instance containing the file. + include_state: An _IncludeState instance. + error: The function to call with any errors found. + io: The IO factory to use to read the header file. Provided for unittest + injection. + """ + required = {} # A map of header name to linenumber and the template entity. + # Example of required: { '<functional>': (1219, 'less<>') } + + for linenum in xrange(clean_lines.NumLines()): + line = clean_lines.elided[linenum] + if not line or line[0] == '#': + continue + + # String is special -- it is a non-templatized type in STL. + m = _RE_PATTERN_STRING.search(line) + if m: + # Don't warn about strings in non-STL namespaces: + # (We check only the first match per line; good enough.) + prefix = line[:m.start()] + if prefix.endswith('std::') or not prefix.endswith('::'): + required['<string>'] = (linenum, 'string') + + for pattern, template, header in _re_pattern_algorithm_header: + if pattern.search(line): + required[header] = (linenum, template) + + # The following function is just a speed up, no semantics are changed. + if not '<' in line: # Reduces the cpu time usage by skipping lines. + continue + + for pattern, template, header in _re_pattern_templates: + if pattern.search(line): + required[header] = (linenum, template) + + # The policy is that if you #include something in foo.h you don't need to + # include it again in foo.cc. Here, we will look at possible includes. + # Let's copy the include_state so it is only messed up within this function. + include_state = include_state.copy() + + # Did we find the header for this file (if any) and succesfully load it? + header_found = False + + # Use the absolute path so that matching works properly. + abs_filename = os.path.abspath(filename) + + # For Emacs's flymake. + # If cpplint is invoked from Emacs's flymake, a temporary file is generated + # by flymake and that file name might end with '_flymake.cc'. In that case, + # restore original file name here so that the corresponding header file can be + # found. + # e.g. If the file name is 'foo_flymake.cc', we should search for 'foo.h' + # instead of 'foo_flymake.h' + abs_filename = re.sub(r'_flymake\.cc$', '.cc', abs_filename) + + # include_state is modified during iteration, so we iterate over a copy of + # the keys. + for header in include_state.keys(): #NOLINT + (same_module, common_path) = FilesBelongToSameModule(abs_filename, header) + fullpath = common_path + header + if same_module and UpdateIncludeState(fullpath, include_state, io): + header_found = True + + # If we can't find the header file for a .cc, assume it's because we don't + # know where to look. In that case we'll give up as we're not sure they + # didn't include it in the .h file. + # TODO(unknown): Do a better job of finding .h files so we are confident that + # not having the .h file means there isn't one. + if filename.endswith('.cc') and not header_found: + return + + # All the lines have been processed, report the errors found. + for required_header_unstripped in required: + template = required[required_header_unstripped][1] + if template in _HEADERS_ACCEPTED_BUT_NOT_PROMOTED: + headers = _HEADERS_ACCEPTED_BUT_NOT_PROMOTED[template] + if [True for header in headers if header in include_state]: + continue + if required_header_unstripped.strip('<>"') not in include_state: + error(filename, required[required_header_unstripped][0], + 'build/include_what_you_use', 4, + 'Add #include ' + required_header_unstripped + ' for ' + template) + + +def ProcessLine(filename, file_extension, + clean_lines, line, include_state, function_state, + class_state, error): + """Processes a single line in the file. + + Args: + filename: Filename of the file that is being processed. + file_extension: The extension (dot not included) of the file. + clean_lines: An array of strings, each representing a line of the file, + with comments stripped. + line: Number of line being processed. + include_state: An _IncludeState instance in which the headers are inserted. + function_state: A _FunctionState instance which counts function lines, etc. + class_state: A _ClassState instance which maintains information about + the current stack of nested class declarations being parsed. + error: A callable to which errors are reported, which takes 4 arguments: + filename, line number, error level, and message + + """ + raw_lines = clean_lines.raw_lines + ParseNolintSuppressions(filename, raw_lines[line], line, error) + CheckForFunctionLengths(filename, clean_lines, line, function_state, error) + CheckForMultilineCommentsAndStrings(filename, clean_lines, line, error) + CheckStyle(filename, clean_lines, line, file_extension, error) + CheckLanguage(filename, clean_lines, line, file_extension, include_state, + error) + CheckForNonStandardConstructs(filename, clean_lines, line, + class_state, error) + CheckPosixThreading(filename, clean_lines, line, error) + CheckInvalidIncrement(filename, clean_lines, line, error) + + +def ProcessFileData(filename, file_extension, lines, error): + """Performs lint checks and reports any errors to the given error function. + + Args: + filename: Filename of the file that is being processed. + file_extension: The extension (dot not included) of the file. + lines: An array of strings, each representing a line of the file, with the + last element being empty if the file is termined with a newline. + error: A callable to which errors are reported, which takes 4 arguments: + """ + lines = (['// marker so line numbers and indices both start at 1'] + lines + + ['// marker so line numbers end in a known way']) + + include_state = _IncludeState() + function_state = _FunctionState() + class_state = _ClassState() + + ResetNolintSuppressions() + + CheckForCopyright(filename, lines, error) + + if file_extension == 'h': + CheckForHeaderGuard(filename, lines, error) + + RemoveMultiLineComments(filename, lines, error) + clean_lines = CleansedLines(lines) + for line in xrange(clean_lines.NumLines()): + ProcessLine(filename, file_extension, clean_lines, line, + include_state, function_state, class_state, error) + class_state.CheckFinished(filename, error) + + CheckForIncludeWhatYouUse(filename, clean_lines, include_state, error) + + # We check here rather than inside ProcessLine so that we see raw + # lines rather than "cleaned" lines. + CheckForUnicodeReplacementCharacters(filename, lines, error) + + CheckForNewlineAtEOF(filename, lines, error) + +def ProcessFile(filename, vlevel): + """Does google-lint on a single file. + + Args: + filename: The name of the file to parse. + + vlevel: The level of errors to report. Every error of confidence + >= verbose_level will be reported. 0 is a good default. + """ + + _SetVerboseLevel(vlevel) + + try: + # Support the UNIX convention of using "-" for stdin. Note that + # we are not opening the file with universal newline support + # (which codecs doesn't support anyway), so the resulting lines do + # contain trailing '\r' characters if we are reading a file that + # has CRLF endings. + # If after the split a trailing '\r' is present, it is removed + # below. If it is not expected to be present (i.e. os.linesep != + # '\r\n' as in Windows), a warning is issued below if this file + # is processed. + + if filename == '-': + lines = codecs.StreamReaderWriter(sys.stdin, + codecs.getreader('utf8'), + codecs.getwriter('utf8'), + 'replace').read().split('\n') + else: + lines = codecs.open(filename, 'r', 'utf8', 'replace').read().split('\n') + + carriage_return_found = False + # Remove trailing '\r'. + for linenum in range(len(lines)): + if lines[linenum].endswith('\r'): + lines[linenum] = lines[linenum].rstrip('\r') + carriage_return_found = True + + except IOError: + sys.stderr.write( + "Skipping input '%s': Can't open for reading\n" % filename) + return + + # Note, if no dot is found, this will give the entire filename as the ext. + file_extension = filename[filename.rfind('.') + 1:] + + # When reading from stdin, the extension is unknown, so no cpplint tests + # should rely on the extension. + if (filename != '-' and file_extension != 'cc' and file_extension != 'h' + and file_extension != 'cpp'): + sys.stderr.write('Ignoring %s; not a .cc or .h file\n' % filename) + else: + ProcessFileData(filename, file_extension, lines, Error) + if carriage_return_found and os.linesep != '\r\n': + # Use 0 for linenum since outputing only one error for potentially + # several lines. + Error(filename, 0, 'whitespace/newline', 1, + 'One or more unexpected \\r (^M) found;' + 'better to use only a \\n') + + sys.stderr.write('Done processing %s\n' % filename) + + +def PrintUsage(message): + """Prints a brief usage string and exits, optionally with an error message. + + Args: + message: The optional error message. + """ + sys.stderr.write(_USAGE) + if message: + sys.exit('\nFATAL ERROR: ' + message) + else: + sys.exit(1) + + +def PrintCategories(): + """Prints a list of all the error-categories used by error messages. + + These are the categories used to filter messages via --filter. + """ + sys.stderr.write(''.join(' %s\n' % cat for cat in _ERROR_CATEGORIES)) + sys.exit(0) + + +def ParseArguments(args): + """Parses the command line arguments. + + This may set the output format and verbosity level as side-effects. + + Args: + args: The command line arguments: + + Returns: + The list of filenames to lint. + """ + try: + (opts, filenames) = getopt.getopt(args, '', ['help', 'output=', 'verbose=', + 'counting=', + 'filter=']) + except getopt.GetoptError: + PrintUsage('Invalid arguments.') + + verbosity = _VerboseLevel() + output_format = _OutputFormat() + filters = '' + counting_style = '' + + for (opt, val) in opts: + if opt == '--help': + PrintUsage(None) + elif opt == '--output': + if not val in ('emacs', 'vs7'): + PrintUsage('The only allowed output formats are emacs and vs7.') + output_format = val + elif opt == '--verbose': + verbosity = int(val) + elif opt == '--filter': + filters = val + if not filters: + PrintCategories() + elif opt == '--counting': + if val not in ('total', 'toplevel', 'detailed'): + PrintUsage('Valid counting options are total, toplevel, and detailed') + counting_style = val + + if not filenames: + PrintUsage('No files were specified.') + + _SetOutputFormat(output_format) + _SetVerboseLevel(verbosity) + _SetFilters(filters) + _SetCountingStyle(counting_style) + + return filenames + + +def main(): + filenames = ParseArguments(sys.argv[1:]) + + # Change stderr to write with replacement characters so we don't die + # if we try to print something containing non-ASCII characters. + sys.stderr = codecs.StreamReaderWriter(sys.stderr, + codecs.getreader('utf8'), + codecs.getwriter('utf8'), + 'replace') + + _cpplint_state.ResetErrorCounts() + for filename in filenames: + ProcessFile(filename, _cpplint_state.verbose_level) + _cpplint_state.PrintErrorCounts() + + sys.exit(_cpplint_state.error_count > 0) + + +if __name__ == '__main__': + main() |