"""Lints C files in the Neovim source tree.
This 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 copy
import getopt
import os
import re
import string
import sys
import json
import collections
_USAGE = """
Syntax: clint.py [--verbose=#] [--output=vs7] [--filter=-x,+y,...]
[--counting=total|toplevel|detailed] [--root=subdir]
[--linelength=digits] [--record-errors=file]
[--suppress-errors=file] [--stdin-filename=filename]
<file> [file] ...
The style guidelines this tries to follow are those in
https://neovim.io/doc/user/dev_style.html#dev-style
Note: This is Google's https://github.com/cpplint/cpplint modified for use
with the Neovim project.
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.
Default linted extensions are .cc, .cpp, .cu, .cuh and .h. Change the
extensions with the --extensions flag.
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.
root=subdir
The root directory used for deriving header guard CPP variable.
By default, the header guard CPP variable is calculated as the relative
path to the directory that contains .git, .hg, or .svn. When this flag
is specified, the relative path is calculated from the specified
directory. If the specified directory does not exist, this flag is
ignored.
Examples:
Assuing that src/.git exists, the header guard CPP variables for
src/chrome/browser/ui/browser.h are:
No flag => CHROME_BROWSER_UI_BROWSER_H_
--root=chrome => BROWSER_UI_BROWSER_H_
--root=chrome/browser => UI_BROWSER_H_
linelength=digits
This is the allowed line length for the project. The default value is
80 characters.
Examples:
--linelength=120
extensions=extension,extension,...
The allowed file extensions that cpplint will check
Examples:
--extensions=hpp,cpp
record-errors=file
Record errors to the given location. This file may later be used for error
suppression using suppress-errors flag.
suppress-errors=file
Errors listed in the given file will not be reported.
stdin-filename=filename
Use specified filename when reading from stdin (file "-").
"""
_ERROR_CATEGORIES = [
'build/endif_comment',
'build/header_guard',
'build/include_defs',
'build/defs_header',
'build/printf_format',
'build/storage_class',
'build/init_macro',
'readability/bool',
'readability/multiline_comment',
'readability/multiline_string',
'readability/nul',
'readability/todo',
'readability/utf8',
'readability/increment',
'runtime/arrays',
'runtime/int',
'runtime/memset',
'runtime/printf',
'runtime/printf_format',
'runtime/threadsafe_fn',
'runtime/deprecated',
'whitespace/comments',
'whitespace/indent',
'whitespace/operators',
'whitespace/todo',
'whitespace/cast',
]
_DEFAULT_FILTERS = []
_NO_ASM = 0
_INSIDE_ASM = 1
_END_ASM = 2
_BLOCK_ASM = 3
_MATCH_ASM = re.compile(r'^\s*(?:asm|_asm|__asm|__asm__)'
r'(?:\s+(volatile|__volatile__))?'
r'\s*[{(]')
_regexp_compile_cache = {}
_RE_SUPPRESSION = re.compile(r'\bNOLINT\b(\([^)]*\))?')
_error_suppressions = {}
_error_suppressions_2 = set()
_line_length = 100
_valid_extensions = {'c', 'h'}
_RE_COMMENTLINE = re.compile(r'^\s*//')
def ParseNolintSuppressions(raw_line, linenum):
"""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:
raw_line: str, the line of input text, with comments.
linenum: int, the number of the current line.
"""
matched = _RE_SUPPRESSION.search(raw_line)
if matched:
category = matched.group(1)
if category in (None, '(*)'):
_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)
def ParseKnownErrorSuppressions(filename, raw_lines, linenum):
"""Updates the global list of error-suppressions from suppress-file.
Args:
filename: str, the name of the input file.
raw_lines: list, all file lines
linenum: int, the number of the current line.
"""
key = tuple(raw_lines[linenum - 1 if linenum else 0:linenum + 2])
if key in _cpplint_state.suppressed_errors[filename]:
for category in _cpplint_state.suppressed_errors[filename][key]:
_error_suppressions_2.add((category, linenum))
def ResetNolintSuppressions():
"Resets the set of NOLINT suppressions to empty."
_error_suppressions.clear()
def ResetKnownErrorSuppressions():
"Resets the set of suppress-errors=file suppressions to empty."
_error_suppressions_2.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 IsErrorInSuppressedErrorsList(category, linenum):
"""Returns true if the specified error is suppressed by suppress-errors=file
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 presence in
suppressions file.
"""
return (category, linenum) in _error_suppressions_2
def Match(pattern, s):
"""Matches the string with the pattern, caching the compiled regexp."""
if pattern not in _regexp_compile_cache:
_regexp_compile_cache[pattern] = re.compile(pattern)
return _regexp_compile_cache[pattern].match(s)
def Search(pattern, s):
"""Searches the string for the pattern, caching the compiled regexp."""
if pattern not in _regexp_compile_cache:
_regexp_compile_cache[pattern] = re.compile(pattern)
return _regexp_compile_cache[pattern].search(s)
class _CppLintState:
"""Maintains module-wide state.."""
def __init__(self):
self.verbose_level = 1
self.error_count = 0
self.filters = _DEFAULT_FILTERS[:]
self.counting = 'total'
self.errors_by_category = {}
self.stdin_filename = ''
self.output_format = 'emacs'
self.record_errors_file = None
self.suppressed_errors = collections.defaultdict(
lambda: collections.defaultdict(set))
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.
E.g. "+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/bad"
"""
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.items():
sys.stdout.write('Category \'%s\' errors found: %d\n' %
(category, count))
if self.error_count:
sys.stdout.write('Total errors found: %d\n' % self.error_count)
def SuppressErrorsFrom(self, fname):
"""Open file and read a list of suppressed errors from it"""
if fname is None:
return
try:
with open(fname) as fp:
for line in fp:
fname, lines, category = json.loads(line)
lines = tuple(lines)
self.suppressed_errors[fname][lines].add(category)
except OSError:
pass
def RecordErrorsTo(self, fname):
"""Open file with suppressed errors for writing"""
if fname is None:
return
self.record_errors_file = open(fname, 'w')
_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 _SuppressErrorsFrom(fname):
"""Sets the file containing suppressed errors."""
_cpplint_state.SuppressErrorsFrom(fname)
def _RecordErrorsTo(fname):
"""Sets the file containing suppressed errors to write to."""
_cpplint_state.RecordErrorsTo(fname)
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 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."""
abspath = str(os.path.abspath(self._filename))
return abspath.replace('\\', '/')
def RelativePath(self):
"""FullName with <prefix>/src/nvim/ chopped off."""
fullname = self.FullName()
if os.path.exists(fullname):
project_dir = os.path.dirname(fullname)
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"))):
root_dir = os.path.dirname(root_dir)
if os.path.exists(os.path.join(root_dir, ".git")):
root_dir = os.path.join(root_dir, "src", "nvim")
prefix = os.path.commonprefix([root_dir, project_dir])
return fullname[len(prefix) + 1:]
return fullname
def _ShouldPrintError(category, confidence, linenum):
"""If confidence >= verbose, category passes filter and isn't suppressed."""
if IsErrorSuppressedByNolint(category, linenum):
return False
if IsErrorInSuppressedErrorsList(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
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.stdout.write('%s(%s): %s [%s] [%d]\n' % (
filename, linenum, message, category, confidence))
elif _cpplint_state.output_format == 'eclipse':
sys.stdout.write('%s:%s: warning: %s [%s] [%d]\n' % (
filename, linenum, message, category, confidence))
elif _cpplint_state.output_format == 'gh_action':
sys.stdout.write('::error file=%s,line=%s::%s [%s] [%d]\n' % (
filename, linenum, message, category, confidence))
else:
sys.stdout.write('%s:%s: %s [%s] [%d]\n' % (
filename, linenum, message, category, confidence))
_RE_PATTERN_CLEANSE_LINE_ESCAPES = re.compile(
r'\\([abfnrtv?"\\\']|\d+|x[0-9a-fA-F]+)')
_RE_PATTERN_CLEANSE_LINE_DOUBLE_QUOTES = re.compile(r'"([^"]*)"')
_RE_PATTERN_CLEANSE_LINE_SINGLE_QUOTES = re.compile(r"'(.)'")
_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')
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('/*'):
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."""
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].rstrip()
return _RE_PATTERN_CLEANSE_LINE_C_COMMENTS.sub('', line)
class CleansedLines:
"""Holds 5 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_lines member contains all the lines with multiline comments replaced.
4) init_lines member contains all the lines without processing.
5) elided_with_space_strings is like elided, but with string literals
looking like `" "`.
All these three members are of <type 'list'>, and of the same length.
"""
def __init__(self, lines, init_lines):
self.elided = []
self.lines = []
self.raw_lines = lines
self.num_lines = len(lines)
self.init_lines = init_lines
self.lines_without_raw_strings = lines
self.elided_with_space_strings = []
for linenum in range(len(self.lines_without_raw_strings)):
self.lines.append(CleanseComments(
self.lines_without_raw_strings[linenum]))
elided = self._CollapseStrings(
self.lines_without_raw_strings[linenum])
self.elided.append(CleanseComments(elided))
elided = CleanseComments(self._CollapseStrings(
self.lines_without_raw_strings[linenum], True))
self.elided_with_space_strings.append(elided)
def NumLines(self):
"""Returns the number of lines represented."""
return self.num_lines
@staticmethod
def _CollapseStrings(elided, keep_spaces=False):
"""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.
keep_spaces: If true, collapse to
Returns:
The line with collapsed strings.
"""
if not _RE_PATTERN_INCLUDE.match(elided):
elided = _RE_PATTERN_CLEANSE_LINE_ESCAPES.sub(
'' if not keep_spaces else lambda m: ' ' * len(m.group(0)),
elided)
elided = _RE_PATTERN_CLEANSE_LINE_SINGLE_QUOTES.sub(
"''" if not keep_spaces
else lambda m: "'" + (' ' * len(m.group(1))) + "'",
elided)
elided = _RE_PATTERN_CLEANSE_LINE_DOUBLE_QUOTES.sub(
'""' if not keep_spaces
else lambda m: '"' + (' ' * len(m.group(1))) + '"',
elided)
return elided
BRACES = {
'(': ')',
'{': '}',
'[': ']',
}
def FindEndOfExpressionInLine(line, startpos, depth, startchar, endchar):
"""Find the position just after the matching endchar.
Args:
line: a CleansedLines line.
startpos: start searching at this position.
depth: nesting level at startpos.
startchar: expression opening character.
endchar: expression closing character.
Returns:
On finding matching endchar: (index just after matching endchar, 0)
Otherwise: (-1, new depth at end of this line)
"""
for i in range(startpos, len(line)):
if line[i] == startchar:
depth += 1
elif line[i] == endchar:
depth -= 1
if depth == 0:
return (i + 1, 0)
return (-1, depth)
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
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 BRACES:
return (line, clean_lines.NumLines(), -1)
endchar = BRACES[startchar]
(end_pos, num_open) = FindEndOfExpressionInLine(
line, pos, 0, startchar, endchar)
if end_pos > -1:
return (line, linenum, end_pos)
while linenum < clean_lines.NumLines() - 1:
linenum += 1
line = clean_lines.elided[linenum]
(end_pos, num_open) = FindEndOfExpressionInLine(
line, 0, num_open, startchar, endchar)
if end_pos > -1:
return (line, linenum, end_pos)
return (line, clean_lines.NumLines(), -1)
def CheckForHeaderGuard(filename, lines, error):
"""Checks that the file contains "#pragma once".
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.
"""
if filename.endswith('.c.h') or FileInfo(filename).RelativePath() in {
'func_attr.h',
}:
return
if "#pragma once" not in lines:
error(filename, 0, 'build/header_guard', 5,
'No "#pragma once" found in header')
def CheckIncludes(filename, lines, error):
"""Checks that headers only include _defs headers.
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.
"""
if (filename.endswith('.c.h')
or filename.endswith('.in.h')
or FileInfo(filename).RelativePath() in {
'func_attr.h',
'os/pty_proc.h',
}):
return
check_includes_ignore = [
"src/nvim/api/private/validate.h",
"src/nvim/assert_defs.h",
"src/nvim/channel.h",
"src/nvim/charset.h",
"src/nvim/eval/typval.h",
"src/nvim/event/multiqueue.h",
"src/nvim/garray.h",
"src/nvim/globals.h",
"src/nvim/highlight.h",
"src/nvim/lua/executor.h",
"src/nvim/main.h",
"src/nvim/mark.h",
"src/nvim/msgpack_rpc/channel_defs.h",
"src/nvim/msgpack_rpc/unpacker.h",
"src/nvim/option.h",
"src/nvim/os/pty_conpty_win.h",
"src/nvim/os/pty_proc_win.h",
]
skip_headers = [
"auto/config.h",
"klib/klist.h",
"klib/kvec.h",
"mpack/mpack_core.h",
"mpack/object.h",
"nvim/func_attr.h",
"termkey/termkey.h",
"vterm/vterm.h",
"xdiff/xdiff.h",
]
for i in check_includes_ignore:
if filename.endswith(i):
return
for i, line in enumerate(lines):
matched = Match(r'#\s*include\s*"([^"]*)"', line)
if matched:
name = matched.group(1)
if name in skip_headers:
continue
if (not name.endswith('.h.generated.h') and
not name.endswith('/defs.h') and
not name.endswith('_defs.h') and
not name.endswith('.h.inline.generated.h') and
not name.endswith('_defs.generated.h') and
not name.endswith('_enum.generated.h')):
error(filename, i, 'build/include_defs', 5,
'Headers should not include non-"_defs" headers')
def CheckNonSymbols(filename, lines, error):
"""Checks that a _defs.h header only contains non-symbols.
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.
"""
for i, line in enumerate(lines):
if line.startswith('EXTERN ') or line.startswith('extern '):
error(filename, i, 'build/defs_header', 5,
'"_defs" headers should not contain extern variables')
def CheckForBadCharacters(filename, lines, error):
"""Logs an error for each line containing bad characters.
Two kinds of bad characters:
1. 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.
2. NUL bytes. These are problematic for some tools.
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 '\ufffd' in line:
error(filename, linenum, 'readability/utf8', 5,
'Line contains invalid UTF-8'
' (or Unicode replacement character).')
if '\0' in line:
error(filename, linenum, 'readability/nul',
5, 'Line contains NUL byte.')
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]
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. '
'Use C++11 raw strings or concatenation instead.')
def CheckForOldStyleComments(filename, line, linenum, error):
"""Logs an error if we see /*-style comment
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.
"""
if line.find('/*') >= 0 and line[-1] != '\\' and not _RE_COMMENTLINE.match(line):
error(filename, linenum, 'readability/old_style_comment', 5,
'/*-style comment found, it should be replaced with //-style. '
'/*-style comments are only allowed inside macros. '
'Note that you should not use /*-style comments to document '
'macros itself, use doxygen-style comments for this.')
threading_list = (
('asctime(', 'os_asctime_r('),
('ctime(', 'os_ctime_r('),
('getgrgid(', 'os_getgrgid_r('),
('getgrnam(', 'os_getgrnam_r('),
('getlogin(', 'os_getlogin_r('),
('getpwnam(', 'os_getpwnam_r('),
('getpwuid(', 'os_getpwuid_r('),
('gmtime(', 'os_gmtime_r('),
('localtime(', 'os_localtime_r('),
('strtok(', 'os_strtok_r('),
('ttyname(', 'os_ttyname_r('),
('asctime_r(', 'os_asctime_r('),
('ctime_r(', 'os_ctime_r('),
('getgrgid_r(', 'os_getgrgid_r('),
('getgrnam_r(', 'os_getgrnam_r('),
('getlogin_r(', 'os_getlogin_r('),
('getpwnam_r(', 'os_getpwnam_r('),
('getpwuid_r(', 'os_getpwuid_r('),
('gmtime_r(', 'os_gmtime_r('),
('localtime_r(', 'os_localtime_r('),
('strtok_r(', 'os_strtok_r('),
('ttyname_r(', 'os_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)
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,
'Use ' + multithread_safe_function +
'...) instead of ' + single_thread_function +
'...). If it is missing, consider implementing it;' +
' see os_localtime_r for an example.')
memory_functions = (
('malloc(', 'xmalloc('),
('calloc(', 'xcalloc('),
('realloc(', 'xrealloc('),
('strdup(', 'xstrdup('),
('free(', 'xfree('),
)
memory_ignore_pattern = re.compile(r'src/nvim/memory.c$')
def CheckMemoryFunctions(filename, clean_lines, linenum, error):
"""Checks for calls to invalid functions.
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.
"""
if memory_ignore_pattern.search(filename):
return
line = clean_lines.elided[linenum]
for function, suggested_function in memory_functions:
ix = line.find(function)
if ix >= 0 and (ix == 0 or (not line[ix - 1].isalnum() and
line[ix - 1] not in ('_', '.', '>'))):
error(filename, linenum, 'runtime/memory_fn', 2,
'Use ' + suggested_function +
'...) instead of ' + function + '...).')
os_functions = (
('setenv(', 'os_setenv('),
('getenv(', 'os_getenv('),
('_wputenv(', 'os_setenv('),
('_putenv_s(', 'os_setenv('),
('putenv(', 'os_setenv('),
('unsetenv(', 'os_unsetenv('),
)
def CheckOSFunctions(filename, clean_lines, linenum, error):
"""Checks for calls to invalid functions.
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 function, suggested_function in os_functions:
ix = line.find(function)
if ix >= 0 and (ix == 0 or (not line[ix - 1].isalnum() and
line[ix - 1] not in ('_', '.', '>'))):
error(filename, linenum, 'runtime/os_fn', 2,
'Use ' + suggested_function +
'...) instead of ' + function + '...).')
class _BlockInfo:
"""Stores information about a generic block of code."""
def __init__(self, seen_open_brace):
self.seen_open_brace = seen_open_brace
self.open_parentheses = 0
self.inline_asm = _NO_ASM
class _PreprocessorInfo:
"""Stores checkpoints of nesting stacks when #if/#else is seen."""
def __init__(self, stack_before_if):
self.stack_before_if = stack_before_if
self.stack_before_else = []
self.seen_else = False
class _NestingState:
"""Holds states related to parsing braces."""
def __init__(self):
self.stack = []
self.pp_stack = []
def SeenOpenBrace(self):
"""Check if we have seen the opening brace for the innermost block.
Returns:
True if we have seen the opening brace, False if the innermost
block is still expecting an opening brace.
"""
return (not self.stack) or self.stack[-1].seen_open_brace
def UpdatePreprocessor(self, line):
"""Update preprocessor stack.
We need to handle preprocessors due to classes like this:
#ifdef SWIG
struct ResultDetailsPageElementExtensionPoint {
#else
struct ResultDetailsPageElementExtensionPoint : public Extension {
#endif
We make the following assumptions (good enough for most files):
- Preprocessor condition evaluates to true from #if up to first
#else/#elif/#endif.
- Preprocessor condition evaluates to false from #else/#elif up
to #endif. We still perform lint checks on these lines, but
these do not affect nesting stack.
Args:
line: current line to check.
"""
if Match(r'^\s*#\s*(if|ifdef|ifndef)\b', line):
self.pp_stack.append(_PreprocessorInfo(copy.deepcopy(self.stack)))
elif Match(r'^\s*#\s*(else|elif)\b', line):
if self.pp_stack:
if not self.pp_stack[-1].seen_else:
self.pp_stack[-1].seen_else = True
self.pp_stack[-1].stack_before_else = copy.deepcopy(
self.stack)
self.stack = copy.deepcopy(self.pp_stack[-1].stack_before_if)
else:
pass
elif Match(r'^\s*#\s*endif\b', line):
if self.pp_stack:
if self.pp_stack[-1].seen_else:
self.stack = self.pp_stack[-1].stack_before_else
self.pp_stack.pop()
else:
pass
def Update(self, clean_lines, linenum):
"""Update nesting state with current line.
Args:
clean_lines: A CleansedLines instance containing the file.
linenum: The number of the line to check.
"""
line = clean_lines.elided[linenum]
self.UpdatePreprocessor(line)
if self.stack:
inner_block = self.stack[-1]
depth_change = line.count('(') - line.count(')')
inner_block.open_parentheses += depth_change
if inner_block.inline_asm in (_NO_ASM, _END_ASM):
if (depth_change != 0 and
inner_block.open_parentheses == 1 and
_MATCH_ASM.match(line)):
inner_block.inline_asm = _INSIDE_ASM
else:
inner_block.inline_asm = _NO_ASM
elif (inner_block.inline_asm == _INSIDE_ASM and
inner_block.open_parentheses == 0):
inner_block.inline_asm = _END_ASM
while True:
matched = Match(r'^[^{;)}]*([{;)}])(.*)$', line)
if not matched:
break
token = matched.group(1)
if token == '{':
if not self.SeenOpenBrace():
self.stack[-1].seen_open_brace = True
else:
self.stack.append(_BlockInfo(True))
if _MATCH_ASM.match(line):
self.stack[-1].inline_asm = _BLOCK_ASM
elif token == ';' or token == ')':
if not self.SeenOpenBrace():
self.stack.pop()
else:
if self.stack:
self.stack.pop()
line = matched.group(2)
def CheckForNonStandardConstructs(filename, clean_lines, linenum, error):
r"""Logs an error if we see certain non-ANSI constructs ignored by gcc-2.
Complain about several constructs which gcc-2 accepts, but which are
not standard C++. Warning about these in lint is one way to ease the
transition to new compilers.
- put storage class first (e.g. "static const" instead of "const static").
- "%" PRId64 instead of %qd" in printf-type functions.
- "%1$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.
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.
error: A callable to which errors are reported, which takes 4 arguments:
filename, line number, error level, and message
"""
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 "%" PRId64 instead.')
if Search(r'printf\s*\(.*".*%\d+\$', line):
error(filename, linenum, 'runtime/printf_format', 2,
'%N$ formats are unconventional. Try rewriting to avoid them.')
line = line.replace('\\\\', '')
if Search(r'("|\').*\\(%|\[|\(|{)', line):
error(filename, linenum, 'build/printf_format', 3,
'%, [, (, and { are undefined character escapes. Unescape them.')
line = clean_lines.elided[linenum]
if Search(r'\b(const|volatile|void|char|short|int|long'
r'|float|double|signed|unsigned'
r'|u?int8_t|u?int16_t|u?int32_t|u?int64_t'
r'|u?int_least8_t|u?int_least16_t|u?int_least32_t'
r'|u?int_least64_t'
r'|u?int_fast8_t|u?int_fast16_t|u?int_fast32_t'
r'|u?int_fast64_t'
r'|u?intptr_t|u?intmax_t)'
r'\s+(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.')
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()
_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:
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:
return
colon = match.group(3)
if not colon:
error(filename, linenum, 'readability/todo', 2,
'Missing colon in TODO; it should look like '
'"// TODO(my_username): Stuff."')
middle_whitespace = match.group(4)
if middle_whitespace != ' ' and middle_whitespace != '':
error(filename, linenum, 'whitespace/todo', 2,
'TODO(my_username): should be followed by a space')
def FindNextMatchingAngleBracket(clean_lines, linenum, init_suffix):
"""Find the corresponding > to close a template.
Args:
clean_lines: A CleansedLines instance containing the file.
linenum: Current line number.
init_suffix: Remainder of the current line after the initial <.
Returns:
True if a matching bracket exists.
"""
line = init_suffix
nesting_stack = ['<']
while True:
match = Search(r'^[^<>(),;\[\]]*([<>(),;\[\]])(.*)$', line)
if match:
operator = match.group(1)
line = match.group(2)
if nesting_stack[-1] == '<':
if operator in ('<', '(', '['):
nesting_stack.append(operator)
elif operator == '>':
nesting_stack.pop()
if not nesting_stack:
return True
elif operator == ',':
return True
else:
return False
else:
if operator in ('<', '(', '['):
nesting_stack.append(operator)
elif operator in (')', ']'):
nesting_stack.pop()
else:
linenum += 1
if linenum >= len(clean_lines.elided):
break
line = clean_lines.elided[linenum]
return True
def FindPreviousMatchingAngleBracket(clean_lines, linenum, init_prefix):
"""Find the corresponding < that started a template.
Args:
clean_lines: A CleansedLines instance containing the file.
linenum: Current line number.
init_prefix: Part of the current line before the initial >.
Returns:
True if a matching bracket exists.
"""
line = init_prefix
nesting_stack = ['>']
while True:
match = Search(r'^(.*)([<>(),;\[\]])[^<>(),;\[\]]*$', line)
if match:
operator = match.group(2)
line = match.group(1)
if nesting_stack[-1] == '>':
if operator in ('>', ')', ']'):
nesting_stack.append(operator)
elif operator == '<':
nesting_stack.pop()
if not nesting_stack:
return True
elif operator == ',':
return True
else:
return False
else:
if operator in ('>', ')', ']'):
nesting_stack.append(operator)
elif operator in ('(', '['):
nesting_stack.pop()
else:
linenum -= 1
if linenum < 0:
break
line = clean_lines.elided[linenum]
return False
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 add a blank line
after public/protected/private, don't have too many blank lines in a row,
spaces after {, spaces before }.
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.lines_without_raw_strings
line = raw[linenum]
if IsBlankLine(line):
elided = clean_lines.elided
prev_line = elided[linenum - 1]
prevbrace = prev_line.rfind('{')
if prevbrace != -1 and prev_line[prevbrace:].find('}') == -1:
if Match(r' {6}\w', prev_line):
search_position = linenum - 2
while (search_position >= 0
and Match(r' {6}\w', elided[search_position])):
search_position -= 1
commentpos = line.find('//')
if commentpos != -1:
if (line.count('"', 0, commentpos) -
line.count('\\"', 0, commentpos)) % 2 == 0:
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))):
return
commentend = commentpos + 2
if commentend < len(line) and not line[commentend] == ' ':
match = (Search(r'[=/-]{4,}\s*$', line[commentend:]) or
Search(r'^/$', line[commentend:]) or
Search(r'^!< ', line[commentend:]) or
Search(r'^/< ', line[commentend:]) or
Search(r'^/+ ', line[commentend:]) or
Search(r'^(?:\{{3}|\}{3})\d*(?: |$)',
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]
line = re.sub(r'operator(==|!=|<|<<|<=|>=|>>|>)\(', r'operator\(', line)
if Search(r'[\w.]=[\w.]', line) and not Search(r'\b(if|while) ', line):
return
match = Search(r'(?:[^ (*/![])+(?<!\+\+|--)\*', line)
if match:
error(filename, linenum, 'whitespace/operators', 2,
'Missing space before asterisk in %s' % match.group(0))
match = Search(r'[^<>=!\s](==|!=|<=|>=)[^<>=!\s]', line)
if match:
return
if Search(r'(?:&&|\|\|)$', line):
return
match = Search(r'(operator|\S)(?:L|UL|ULL|l|ul|ull)?<<(\S)', line)
if (match and
not (match.group(1).isdigit() and match.group(2).isdigit()) and
not (match.group(1) == 'operator' and match.group(2) == ';')):
error(filename, linenum, 'whitespace/operators', 3,
'Missing spaces around <<')
elif not Match(r'#.*include', line):
reduced_line = line.replace('->', '')
match = Search(r'[^\s<]<([^\s=<].*)', reduced_line)
if (match and not FindNextMatchingAngleBracket(clean_lines, linenum,
match.group(1))):
return
match = Search(r'^(.*[^\s>])>[^\s=>]', reduced_line)
if (match and
not FindPreviousMatchingAngleBracket(clean_lines, linenum,
match.group(1))):
return
match = Search(r'>>[a-zA-Z_]', line)
if match:
error(filename, linenum, 'whitespace/operators', 3,
'Missing spaces around >>')
match = Search(r'(!\s|~\s|[\s]--[\s;]|[\s]\+\+[\s;])', line)
if match:
return
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)):
return
if len(match.group(2)) not in [0, 1]:
return
if any(line.find(k) >= 0 for k in BRACES if k != '{'):
return
match = Match(r'^(.*[^ ({]){', line)
if Search(r'}else', line):
return
if Search(r'\w\s+\[', line):
return
if Search(r'\{(?!\})\S', line):
return
if Search(r'\S(?<!\{)\}', line):
return
cast_line = re.sub(r'^# *define +\w+\([^)]*\)', '', line)
match = Search(r'(?<!\bkvec_t)'
r'(?<!\bkvec_withinit_t)'
r'(?<!\bklist_t)'
r'(?<!\bkliter_t)'
r'(?<!\bkhash_t)'
r'(?<!\bkbtree_t)'
r'(?<!\bkbitr_t)'
r'(?<!\bPMap)'
r'(?<!\bSet)'
r'(?<!\bArrayOf)'
r'(?<!\bDictOf)'
r'(?<!\bDict)'
r'\((?:const )?(?:struct )?[a-zA-Z_]\w*(?: *\*(?:const)?)*\)'
r' +'
r'-?(?:\*+|&)?(?:\w+|\+\+|--|\()', cast_line)
if match and line[0] == ' ':
error(filename, linenum, 'whitespace/cast', 2,
'Should leave no spaces after a cast: {!r}'.format(
match.group(0)))
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):
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]
if Match(r'\s+{\s*$', line):
prevline = GetPreviousNonBlankLine(clean_lines, linenum)[0]
if (not Search(r'[,;:}{(]\s*$', prevline) and
not Match(r'\s*#', prevline)):
return
if Match(r'^(?:\w+(?: ?\*+)? )+\w+\(', line):
pos = line.find('(')
(endline, end_linenum, _) = CloseExpression(clean_lines, linenum, pos)
if endline.endswith('{'):
return
func_start_linenum = end_linenum + 1
while not clean_lines.lines[func_start_linenum] == "{":
attrline = Match(
r'^((?!# *define).*?)'
r'(?:FUNC_ATTR|FUNC_API|REAL_FATTR)_\w+'
r'(?:\(\d+(, \d+)*\))?',
clean_lines.lines[func_start_linenum],
)
if attrline:
if len(attrline.group(1)) != 2:
error(filename, func_start_linenum,
'whitespace/indent', 5,
'Function attribute line should have 2-space '
'indent')
func_start_linenum += 1
else:
func_start = clean_lines.lines[func_start_linenum]
if not func_start.startswith('enum ') and func_start.endswith('{'):
return
break
def CheckStyle(filename, clean_lines, linenum, 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.
error: The function to call with any errors found.
"""
CheckBraces(filename, clean_lines, linenum, error)
CheckSpacing(filename, clean_lines, linenum, error)
_RE_PATTERN_INCLUDE = re.compile(r'^\s*#\s*include\s*([<"])([^>"]*)[>"].*$')
def _GetTextInside(text, start_pattern):
r"""Retrieves all the text between matching open and close parentheses.
Given a string of lines and a regular expression string, retrieve all the
text following the expression and between opening punctuation symbols like
(, [, or {, and the matching close-punctuation symbol. This properly nested
occurrences of the punctuations, so for the text like
printf(a(), b(c()));
a call to _GetTextInside(text, r'printf\(') will return 'a(), b(c())'.
start_pattern must match string having an open punctuation symbol at the
end.
Args:
text: The lines to extract text. Its comments and strings must be elided.
It can be single line and can span multiple lines.
start_pattern: The regexp string indicating where to start extracting
the text.
Returns:
The extracted text.
None if either the opening string or ending punctuation couldn't be found.
"""
matching_punctuation = {'(': ')', '{': '}', '[': ']'}
closing_punctuation = set(matching_punctuation.values())
match = re.search(start_pattern, text, re.M)
if not match:
return None
start_position = match.end(0)
assert start_position > 0, (
'start_pattern must ends with an opening punctuation.')
assert text[start_position - 1] in matching_punctuation, (
'start_pattern must ends with an opening punctuation.')
punctuation_stack = [matching_punctuation[text[start_position - 1]]]
position = start_position
while punctuation_stack and position < len(text):
if text[position] == punctuation_stack[-1]:
punctuation_stack.pop()
elif text[position] in closing_punctuation:
return None
elif text[position] in matching_punctuation:
punctuation_stack.append(matching_punctuation[text[position]])
position += 1
if punctuation_stack:
return None
return text[start_position:position - 1]
def CheckLanguage(filename, clean_lines, linenum, 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.
error : The function to call with any errors found.
"""
line = clean_lines.elided[linenum]
if not line:
return
match = Search(r'\b(short|long long)\b', line)
if match:
error(filename, linenum, 'runtime/int', 4,
'Use int16_t/int64_t/etc, rather than the C type %s'
% match.group(1))
match = Search(r'snprintf\s*\(([^,]*),\s*([0-9]*)\s*,', line)
if match and match.group(2) != '0':
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)))
if Search(r'\bsprintf\b', line):
error(filename, linenum, 'runtime/printf', 5,
'Use snprintf instead of sprintf.')
match = Search(r'\b(strncpy|STRNCPY)\b', line)
if match:
error(filename, linenum, 'runtime/printf', 4,
'Use xstrlcpy, xmemcpyz or snprintf instead of %s (unless this is from Vim)'
% match.group(1))
match = Search(r'\b(strcpy)\b', line)
if match:
error(filename, linenum, 'runtime/printf', 4,
'Use xstrlcpy, xmemcpyz or snprintf instead of %s' % match.group(1))
match = Search(r'\b(STRNCAT|strncat|vim_strcat)\b', line)
if match:
error(filename, linenum, 'runtime/printf', 4,
'Use xstrlcat or snprintf instead of %s' % match.group(1))
if not Search(r'eval/typval\.[ch]$|eval/typval_defs\.h$', filename):
match = Search(r'(?:\.|->)'
r'(?:lv_(?:first|last|refcount|len|watch|idx(?:_item)?'
r'|copylist|lock)'
r'|li_(?:next|prev|tv))\b', line)
if match:
error(filename, linenum, 'runtime/deprecated', 4,
'Accessing list_T internals directly is prohibited; '
'see https://neovim.io/doc/user/dev_vimpatch.html#dev-vimpatch-list-management')
if Search(r'\}\s*if\s*\(', line):
return
printf_args = _GetTextInside(line, r'(?i)\b(string)?printf\s*\(')
if printf_args:
match = Match(r'([\w.\->()]+)$', printf_args)
if match and match.group(1) != '__VA_ARGS__':
function_name_groups = re.search(r'\b((?:string)?printf)\s*\(', line, re.I)
assert function_name_groups
function_name = function_name_groups.group(1)
error(filename, linenum, 'runtime/printf', 4,
'Potential format string bug. Do %s("%%s", %s) instead.'
% (function_name, match.group(1)))
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)))
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):
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
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 not filename.endswith('.h') and Search(r' INIT\(', line):
error(filename, linenum, 'build/init_macro', 4,
'INIT() macro should only be used in header files.')
match = Search(r'\b(TRUE|FALSE)\b', line)
if match:
token = match.group(1)
error(filename, linenum, 'readability/bool', 4,
'Use {} instead of {}.'.format(token.lower(), token))
match = Search(r'\b(MAYBE)\b', line)
if match:
token = match.group(1)
error(filename, linenum, 'readability/bool', 4,
'Use kNONE from TriState instead of %s.' % token)
match = Match(r'^\s*(?:\+\+|--)', line)
if match:
error(filename, linenum, 'readability/increment', 5,
'Do not use preincrement in statements, '
'use postincrement instead')
match = Search(r';\s*(\+\+|--)', line)
if match:
end_pos, end_depth = FindEndOfExpressionInLine(line, match.start(1), 1,
'(', ')')
expr = line[match.start(1):end_pos]
if end_depth == 0 and ';' not in expr and ' = ' not in expr:
error(filename, linenum, 'readability/increment', 4,
'Do not use preincrement in statements, including '
'for(;; action)')
def ProcessLine(filename, clean_lines, line,
nesting_state, error,
extra_check_functions=[]):
"""Processes a single line in the file.
Args:
filename : Filename of the file that is being processed.
clean_lines : An array of strings, each representing a line of
the file, with comments stripped.
line : Number of line being processed.
nesting_state : A _NestingState instance which maintains
information about the current stack of nested
blocks being parsed.
error : A callable to which errors are reported, which
takes 4 arguments: filename, line number, error
level, and message
extra_check_functions : An array of additional check functions that will
be run on each source line. Each function takes 4
arguments : filename, clean_lines, line, error
"""
raw_lines = clean_lines.raw_lines
init_lines = clean_lines.init_lines
ParseNolintSuppressions(raw_lines[line], line)
nesting_state.Update(clean_lines, line)
if nesting_state.stack and nesting_state.stack[-1].inline_asm != _NO_ASM:
return
CheckForMultilineCommentsAndStrings(filename, clean_lines, line, error)
CheckForOldStyleComments(filename, init_lines[line], line, error)
CheckStyle(filename, clean_lines, line, error)
CheckLanguage(filename, clean_lines, line, error)
CheckForNonStandardConstructs(filename, clean_lines, line, error)
CheckPosixThreading(filename, clean_lines, line, error)
CheckMemoryFunctions(filename, clean_lines, line, error)
CheckOSFunctions(filename, clean_lines, line, error)
for check_fn in extra_check_functions:
check_fn(filename, clean_lines, line, error)
def ProcessFileData(filename, file_extension, lines, error,
extra_check_functions=[]):
"""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 terminated with a newline.
error: A callable to which errors are reported, which takes 4 arguments:
filename, line number, error level, and message
extra_check_functions: An array of additional check functions that will be
run on each source line. Each function takes 4
arguments: filename, clean_lines, line, error
"""
lines = (['// marker so line numbers and indices both start at 1'] + lines +
['// marker so line numbers end in a known way'])
nesting_state = _NestingState()
ResetNolintSuppressions()
ResetKnownErrorSuppressions()
for line in range(1, len(lines)):
ParseKnownErrorSuppressions(filename, lines, line)
init_lines = lines[:]
if _cpplint_state.record_errors_file:
def RecordedError(filename, linenum, category, confidence, message):
if not IsErrorSuppressedByNolint(category, linenum):
key = init_lines[linenum - 1 if linenum else 0:linenum + 2]
err = [filename, key, category]
assert _cpplint_state.record_errors_file
json.dump(err, _cpplint_state.record_errors_file)
_cpplint_state.record_errors_file.write('\n')
Error(filename, linenum, category, confidence, message)
error = RecordedError
RemoveMultiLineComments(filename, lines, error)
clean_lines = CleansedLines(lines, init_lines)
for line in range(clean_lines.NumLines()):
ProcessLine(filename, clean_lines, line,
nesting_state, error,
extra_check_functions)
if file_extension == 'h':
CheckForHeaderGuard(filename, lines, error)
CheckIncludes(filename, lines, error)
if filename.endswith('/defs.h') or filename.endswith('_defs.h'):
CheckNonSymbols(filename, lines, error)
CheckForBadCharacters(filename, lines, error)
def ProcessFile(filename, vlevel, extra_check_functions=[]):
"""Does neovim-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.
extra_check_functions: An array of additional check functions that will be
run on each source line. Each function takes 4
arguments: filename, clean_lines, line, error
"""
_SetVerboseLevel(vlevel)
try:
if filename == '-':
stdin = sys.stdin.read()
lines = stdin.split('\n')
if _cpplint_state.stdin_filename is not None:
filename = _cpplint_state.stdin_filename
else:
lines = open(
filename, 'r', encoding='utf-8', errors='replace', newline=None).read().split('\n')
for linenum in range(len(lines)):
if lines[linenum].endswith('\r'):
lines[linenum] = lines[linenum].rstrip('\r')
except OSError:
sys.stderr.write(
"Skipping input '%s': Can't open for reading\n" % filename)
return
file_extension = filename[filename.rfind('.') + 1:]
if filename != '-' and file_extension not in _valid_extensions:
sys.stderr.write('Ignoring {}; only linting {} files\n'.format(
filename,
', '.join('.{}'.format(ext) for ext in _valid_extensions)))
else:
ProcessFileData(filename, file_extension, lines, Error,
extra_check_functions)
def PrintUsage(message):
"""Prints a brief usage string and exits, optionally with an error message.
Args:
message: The optional error message.
"""
if message:
sys.stderr.write(_USAGE)
sys.exit('\nFATAL ERROR: ' + message)
else:
sys.stdout.write(_USAGE)
sys.exit(0)
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.stdout.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.
"""
opts = []
filenames = []
try:
(opts, filenames) = getopt.getopt(args, '', ['help',
'output=',
'verbose=',
'counting=',
'filter=',
'root=',
'linelength=',
'extensions=',
'record-errors=',
'suppress-errors=',
'stdin-filename=',
])
except getopt.GetoptError:
PrintUsage('Invalid arguments.')
verbosity = _VerboseLevel()
output_format = _OutputFormat()
filters = ''
counting_style = ''
record_errors_file = None
suppress_errors_file = None
stdin_filename = ''
for (opt, val) in opts:
if opt == '--help':
PrintUsage(None)
elif opt == '--output':
if val not in ('emacs', 'vs7', 'eclipse', 'gh_action'):
PrintUsage('The only allowed output formats are emacs,'
' vs7 and eclipse.')
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
elif opt == '--linelength':
global _line_length
try:
_line_length = int(val)
except ValueError:
PrintUsage('Line length must be digits.')
elif opt == '--extensions':
global _valid_extensions
try:
_valid_extensions = set(val.split(','))
except ValueError:
PrintUsage('Extensions must be comma separated list.')
elif opt == '--record-errors':
record_errors_file = val
elif opt == '--suppress-errors':
suppress_errors_file = val
elif opt == '--stdin-filename':
stdin_filename = val
if not filenames:
PrintUsage('No files were specified.')
_SetOutputFormat(output_format)
_SetVerboseLevel(verbosity)
_SetFilters(filters)
_SetCountingStyle(counting_style)
_SuppressErrorsFrom(suppress_errors_file)
_RecordErrorsTo(record_errors_file)
_cpplint_state.stdin_filename = stdin_filename
return filenames
def main():
filenames = ParseArguments(sys.argv[1:])
_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()