Update cpplint.py to r133.
The only difference compared to upstream[1] is the shebang line from
depot_tools.
[1] https://code.google.com/p/google-styleguide/source/browse/trunk/cpplint/cpplint.py?spec=svn131&r=133
BUG=None
Review URL: https://codereview.chromium.org/317053002
git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@274946 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/cpplint.py b/cpplint.py
index 8bd90c2..92384dc 100755
--- a/cpplint.py
+++ b/cpplint.py
@@ -114,7 +114,7 @@
ignored.
Examples:
- Assuing that src/.git exists, the header guard CPP variables for
+ Assuming that src/.git exists, the header guard CPP variables for
src/chrome/browser/ui/browser.h are:
No flag => CHROME_BROWSER_UI_BROWSER_H_
@@ -141,6 +141,7 @@
# here! cpplint_unittest.py should tell you if you forget to do this.
_ERROR_CATEGORIES = [
'build/class',
+ 'build/c++11',
'build/deprecated',
'build/endif_comment',
'build/explicit_make_pair',
@@ -203,7 +204,7 @@
'whitespace/todo'
]
-# The default state of the category filter. This is overrided by the --filter=
+# The default state of the category filter. This is overridden 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.
@@ -213,7 +214,6 @@
# decided those were OK, as long as they were in UTF-8 and didn't represent
# hard-coded international strings, which belong in a separate i18n file.
-
# C++ headers
_CPP_HEADERS = frozenset([
# Legacy
@@ -350,6 +350,7 @@
'cwctype',
])
+
# 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.
@@ -500,6 +501,7 @@
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
@@ -954,6 +956,7 @@
# 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
@@ -1011,11 +1014,9 @@
# Matches standard C++ escape sequences 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.
+# Match a single C style comment on the same line.
+_RE_PATTERN_C_COMMENTS = r'/\*(?:[^*]|\*(?!/))*\*/'
+# Matches multi-line C style 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.
@@ -1024,10 +1025,10 @@
# 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*$|
- /\*.*\*/\s+|
- \s+/\*.*\*/(?=\W)|
- /\*.*\*/)""", re.VERBOSE)
+ r'(\s*' + _RE_PATTERN_C_COMMENTS + r'\s*$|' +
+ _RE_PATTERN_C_COMMENTS + r'\s+|' +
+ r'\s+' + _RE_PATTERN_C_COMMENTS + r'(?=\W)|' +
+ _RE_PATTERN_C_COMMENTS + r')')
def IsCppString(line):
@@ -1082,9 +1083,12 @@
delimiter = None
else:
# Haven't found the end yet, append a blank line.
- line = ''
+ line = '""'
- else:
+ # Look for beginning of a raw string, and replace them with
+ # empty strings. This is done in a loop to handle multiple raw
+ # strings on the same line.
+ while delimiter is None:
# Look for beginning of a raw string.
# See 2.14.15 [lex.string] for syntax.
matched = Match(r'^(.*)\b(?:R|u8R|uR|UR|LR)"([^\s\\()]*)\((.*)$', line)
@@ -1100,6 +1104,8 @@
else:
# Start of a multi-line raw string
line = matched.group(1) + '""'
+ else:
+ break
lines_without_raw_strings.append(line)
@@ -1205,38 +1211,138 @@
Returns:
The line with collapsed strings.
"""
- if not _RE_PATTERN_INCLUDE.match(elided):
- # Remove escaped characters first to make quote/single quote collapsing
- # basic. Things that look like escaped characters shouldn't occur
- # outside of strings and chars.
- elided = _RE_PATTERN_CLEANSE_LINE_ESCAPES.sub('', elided)
- elided = _RE_PATTERN_CLEANSE_LINE_SINGLE_QUOTES.sub("''", elided)
- elided = _RE_PATTERN_CLEANSE_LINE_DOUBLE_QUOTES.sub('""', elided)
- return elided
+ if _RE_PATTERN_INCLUDE.match(elided):
+ return elided
+
+ # Remove escaped characters first to make quote/single quote collapsing
+ # basic. Things that look like escaped characters shouldn't occur
+ # outside of strings and chars.
+ elided = _RE_PATTERN_CLEANSE_LINE_ESCAPES.sub('', elided)
+
+ # Replace quoted strings and digit separators. Both single quotes
+ # and double quotes are processed in the same loop, otherwise
+ # nested quotes wouldn't work.
+ collapsed = ''
+ while True:
+ # Find the first quote character
+ match = Match(r'^([^\'"]*)([\'"])(.*)$', elided)
+ if not match:
+ collapsed += elided
+ break
+ head, quote, tail = match.groups()
+
+ if quote == '"':
+ # Collapse double quoted strings
+ second_quote = tail.find('"')
+ if second_quote >= 0:
+ collapsed += head + '""'
+ elided = tail[second_quote + 1:]
+ else:
+ # Unmatched double quote, don't bother processing the rest
+ # of the line since this is probably a multiline string.
+ collapsed += elided
+ break
+ else:
+ # Found single quote, check nearby text to eliminate digit separators.
+ #
+ # There is no special handling for floating point here, because
+ # the integer/fractional/exponent parts would all be parsed
+ # correctly as long as there are digits on both sides of the
+ # separator. So we are fine as long as we don't see something
+ # like "0.'3" (gcc 4.9.0 will not allow this literal).
+ if Search(r'\b(?:0[bBxX]?|[1-9])[0-9a-fA-F]*$', head):
+ match_literal = Match(r'^((?:\'?[0-9a-zA-Z_])*)(.*)$', "'" + tail)
+ collapsed += head + match_literal.group(1).replace("'", '')
+ elided = match_literal.group(2)
+ else:
+ second_quote = tail.find('\'')
+ if second_quote >= 0:
+ collapsed += head + "''"
+ elided = tail[second_quote + 1:]
+ else:
+ # Unmatched single quote
+ collapsed += elided
+ break
+
+ return collapsed
-def FindEndOfExpressionInLine(line, startpos, depth, startchar, endchar):
- """Find the position just after the matching endchar.
+def FindEndOfExpressionInLine(line, startpos, stack):
+ """Find the position just after the end of current parenthesized expression.
Args:
line: a CleansedLines line.
startpos: start searching at this position.
- depth: nesting level at startpos.
- startchar: expression opening character.
- endchar: expression closing character.
+ stack: nesting stack at startpos.
Returns:
- On finding matching endchar: (index just after matching endchar, 0)
- Otherwise: (-1, new depth at end of this line)
+ On finding matching end: (index just after matching end, None)
+ On finding an unclosed expression: (-1, None)
+ Otherwise: (-1, new stack at end of this line)
"""
for i in xrange(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)
+ char = line[i]
+ if char in '([{':
+ # Found start of parenthesized expression, push to expression stack
+ stack.append(char)
+ elif char == '<':
+ # Found potential start of template argument list
+ if i > 0 and line[i - 1] == '<':
+ # Left shift operator
+ if stack and stack[-1] == '<':
+ stack.pop()
+ if not stack:
+ return (-1, None)
+ elif i > 0 and Search(r'\boperator\s*$', line[0:i]):
+ # operator<, don't add to stack
+ continue
+ else:
+ # Tentative start of template argument list
+ stack.append('<')
+ elif char in ')]}':
+ # Found end of parenthesized expression.
+ #
+ # If we are currently expecting a matching '>', the pending '<'
+ # must have been an operator. Remove them from expression stack.
+ while stack and stack[-1] == '<':
+ stack.pop()
+ if not stack:
+ return (-1, None)
+ if ((stack[-1] == '(' and char == ')') or
+ (stack[-1] == '[' and char == ']') or
+ (stack[-1] == '{' and char == '}')):
+ stack.pop()
+ if not stack:
+ return (i + 1, None)
+ else:
+ # Mismatched parentheses
+ return (-1, None)
+ elif char == '>':
+ # Found potential end of template argument list.
+
+ # Ignore "->" and operator functions
+ if (i > 0 and
+ (line[i - 1] == '-' or Search(r'\boperator\s*$', line[0:i - 1]))):
+ continue
+
+ # Pop the stack if there is a matching '<'. Otherwise, ignore
+ # this '>' since it must be an operator.
+ if stack:
+ if stack[-1] == '<':
+ stack.pop()
+ if not stack:
+ return (i + 1, None)
+ elif char == ';':
+ # Found something that look like end of statements. If we are currently
+ # expecting a '>', the matching '<' must have been an operator, since
+ # template argument list should not contain statements.
+ while stack and stack[-1] == '<':
+ stack.pop()
+ if not stack:
+ return (-1, None)
+
+ # Did not find end of expression or unbalanced parentheses on this line
+ return (-1, stack)
def CloseExpression(clean_lines, linenum, pos):
@@ -1245,6 +1351,11 @@
If lines[linenum][pos] points to a '(' or '{' or '[' or '<', finds the
linenum/pos that correspond to the closing of the expression.
+ TODO(unknown): cpplint spends a fair bit of time matching parentheses.
+ Ideally we would want to index all opening and closing parentheses once
+ and have CloseExpression be just a simple lookup, but due to preprocessor
+ tricks, this is not so easy.
+
Args:
clean_lines: A CleansedLines instance containing the file.
linenum: The number of the line to check.
@@ -1258,35 +1369,28 @@
"""
line = clean_lines.elided[linenum]
- startchar = line[pos]
- if startchar not in '({[<':
+ if (line[pos] not in '({[<') or Match(r'<[<=]', line[pos:]):
return (line, clean_lines.NumLines(), -1)
- if startchar == '(': endchar = ')'
- if startchar == '[': endchar = ']'
- if startchar == '{': endchar = '}'
- if startchar == '<': endchar = '>'
# Check first line
- (end_pos, num_open) = FindEndOfExpressionInLine(
- line, pos, 0, startchar, endchar)
+ (end_pos, stack) = FindEndOfExpressionInLine(line, pos, [])
if end_pos > -1:
return (line, linenum, end_pos)
# Continue scanning forward
- while linenum < clean_lines.NumLines() - 1:
+ while stack and linenum < clean_lines.NumLines() - 1:
linenum += 1
line = clean_lines.elided[linenum]
- (end_pos, num_open) = FindEndOfExpressionInLine(
- line, 0, num_open, startchar, endchar)
+ (end_pos, stack) = FindEndOfExpressionInLine(line, 0, stack)
if end_pos > -1:
return (line, linenum, end_pos)
- # Did not find endchar before end of file, give up
+ # Did not find end of expression before end of file, give up
return (line, clean_lines.NumLines(), -1)
-def FindStartOfExpressionInLine(line, endpos, depth, startchar, endchar):
- """Find position at the matching startchar.
+def FindStartOfExpressionInLine(line, endpos, stack):
+ """Find position at the matching start of current expression.
This is almost the reverse of FindEndOfExpressionInLine, but note
that the input position and returned position differs by 1.
@@ -1294,22 +1398,72 @@
Args:
line: a CleansedLines line.
endpos: start searching at this position.
- depth: nesting level at endpos.
- startchar: expression opening character.
- endchar: expression closing character.
+ stack: nesting stack at endpos.
Returns:
- On finding matching startchar: (index at matching startchar, 0)
- Otherwise: (-1, new depth at beginning of this line)
+ On finding matching start: (index at matching start, None)
+ On finding an unclosed expression: (-1, None)
+ Otherwise: (-1, new stack at beginning of this line)
"""
- for i in xrange(endpos, -1, -1):
- if line[i] == endchar:
- depth += 1
- elif line[i] == startchar:
- depth -= 1
- if depth == 0:
- return (i, 0)
- return (-1, depth)
+ i = endpos
+ while i >= 0:
+ char = line[i]
+ if char in ')]}':
+ # Found end of expression, push to expression stack
+ stack.append(char)
+ elif char == '>':
+ # Found potential end of template argument list.
+ #
+ # Ignore it if it's a "->" or ">=" or "operator>"
+ if (i > 0 and
+ (line[i - 1] == '-' or
+ Match(r'\s>=\s', line[i - 1:]) or
+ Search(r'\boperator\s*$', line[0:i]))):
+ i -= 1
+ else:
+ stack.append('>')
+ elif char == '<':
+ # Found potential start of template argument list
+ if i > 0 and line[i - 1] == '<':
+ # Left shift operator
+ i -= 1
+ else:
+ # If there is a matching '>', we can pop the expression stack.
+ # Otherwise, ignore this '<' since it must be an operator.
+ if stack and stack[-1] == '>':
+ stack.pop()
+ if not stack:
+ return (i, None)
+ elif char in '([{':
+ # Found start of expression.
+ #
+ # If there are any unmatched '>' on the stack, they must be
+ # operators. Remove those.
+ while stack and stack[-1] == '>':
+ stack.pop()
+ if not stack:
+ return (-1, None)
+ if ((char == '(' and stack[-1] == ')') or
+ (char == '[' and stack[-1] == ']') or
+ (char == '{' and stack[-1] == '}')):
+ stack.pop()
+ if not stack:
+ return (i, None)
+ else:
+ # Mismatched parentheses
+ return (-1, None)
+ elif char == ';':
+ # Found something that look like end of statements. If we are currently
+ # expecting a '<', the matching '>' must have been an operator, since
+ # template argument list should not contain statements.
+ while stack and stack[-1] == '>':
+ stack.pop()
+ if not stack:
+ return (-1, None)
+
+ i -= 1
+
+ return (-1, stack)
def ReverseCloseExpression(clean_lines, linenum, pos):
@@ -1330,30 +1484,23 @@
return is the 'cleansed' line at linenum.
"""
line = clean_lines.elided[linenum]
- endchar = line[pos]
- if endchar not in ')}]>':
+ if line[pos] not in ')}]>':
return (line, 0, -1)
- if endchar == ')': startchar = '('
- if endchar == ']': startchar = '['
- if endchar == '}': startchar = '{'
- if endchar == '>': startchar = '<'
# Check last line
- (start_pos, num_open) = FindStartOfExpressionInLine(
- line, pos, 0, startchar, endchar)
+ (start_pos, stack) = FindStartOfExpressionInLine(line, pos, [])
if start_pos > -1:
return (line, linenum, start_pos)
# Continue scanning backward
- while linenum > 0:
+ while stack and linenum > 0:
linenum -= 1
line = clean_lines.elided[linenum]
- (start_pos, num_open) = FindStartOfExpressionInLine(
- line, len(line) - 1, num_open, startchar, endchar)
+ (start_pos, stack) = FindStartOfExpressionInLine(line, len(line) - 1, stack)
if start_pos > -1:
return (line, linenum, start_pos)
- # Did not find startchar before beginning of file, give up
+ # Did not find start of expression before beginning of file, give up
return (line, 0, -1)
@@ -1370,6 +1517,22 @@
'You should have a line: "Copyright [year] <Copyright Owner>"')
+def GetIndentLevel(line):
+ """Return the number of leading spaces in line.
+
+ Args:
+ line: A string to check.
+
+ Returns:
+ An integer count of leading spaces, possibly zero.
+ """
+ indent = Match(r'^( *)\S', line)
+ if indent:
+ return len(indent.group(1))
+ else:
+ return 0
+
+
def GetHeaderGuardCPPVariable(filename):
"""Returns the CPP variable that should be used as a header guard.
@@ -1550,19 +1713,33 @@
'Use C++11 raw strings or 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('),
- ('strtok(', 'strtok_r('),
- ('ttyname(', 'ttyname_r('),
+# (non-threadsafe name, thread-safe alternative, validation pattern)
+#
+# The validation pattern is used to eliminate false positives such as:
+# _rand(); // false positive due to substring match.
+# ->rand(); // some member function rand().
+# ACMRandom rand(seed); // some variable named rand.
+# ISAACRandom rand(); // another variable named rand.
+#
+# Basically we require the return value of these functions to be used
+# in some expression context on the same line by matching on some
+# operator before the function name. This eliminates constructors and
+# member function calls.
+_UNSAFE_FUNC_PREFIX = r'(?:[-+*/=%^&|(<]\s*|>\s+)'
+_THREADING_LIST = (
+ ('asctime(', 'asctime_r(', _UNSAFE_FUNC_PREFIX + r'asctime\([^)]+\)'),
+ ('ctime(', 'ctime_r(', _UNSAFE_FUNC_PREFIX + r'ctime\([^)]+\)'),
+ ('getgrgid(', 'getgrgid_r(', _UNSAFE_FUNC_PREFIX + r'getgrgid\([^)]+\)'),
+ ('getgrnam(', 'getgrnam_r(', _UNSAFE_FUNC_PREFIX + r'getgrnam\([^)]+\)'),
+ ('getlogin(', 'getlogin_r(', _UNSAFE_FUNC_PREFIX + r'getlogin\(\)'),
+ ('getpwnam(', 'getpwnam_r(', _UNSAFE_FUNC_PREFIX + r'getpwnam\([^)]+\)'),
+ ('getpwuid(', 'getpwuid_r(', _UNSAFE_FUNC_PREFIX + r'getpwuid\([^)]+\)'),
+ ('gmtime(', 'gmtime_r(', _UNSAFE_FUNC_PREFIX + r'gmtime\([^)]+\)'),
+ ('localtime(', 'localtime_r(', _UNSAFE_FUNC_PREFIX + r'localtime\([^)]+\)'),
+ ('rand(', 'rand_r(', _UNSAFE_FUNC_PREFIX + r'rand\(\)'),
+ ('strtok(', 'strtok_r(',
+ _UNSAFE_FUNC_PREFIX + r'strtok\([^)]+\)'),
+ ('ttyname(', 'ttyname_r(', _UNSAFE_FUNC_PREFIX + r'ttyname\([^)]+\)'),
)
@@ -1582,14 +1759,13 @@
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=g-explicit-bool-comparison
- if ix >= 0 and (ix == 0 or (not line[ix - 1].isalnum() and
- line[ix - 1] not in ('_', '.', '>'))):
+ for single_thread_func, multithread_safe_func, pattern in _THREADING_LIST:
+ # Additional pattern matching check to confirm that this is the
+ # function we are looking for
+ if Search(pattern, line):
error(filename, linenum, 'runtime/threadsafe_fn', 2,
- 'Consider using ' + multithread_safe_function +
- '...) instead of ' + single_thread_function +
+ 'Consider using ' + multithread_safe_func +
+ '...) instead of ' + single_thread_func +
'...) for improved thread safety.')
@@ -1611,7 +1787,6 @@
'VLOG() should be used with numeric verbosity level. '
'Use LOG() if you want symbolic severity levels.')
-
# Matches invalid increment: *count++, which moves pointer instead of
# incrementing a value.
_RE_PATTERN_INVALID_INCREMENT = re.compile(
@@ -1676,6 +1851,24 @@
"""
pass
+ def IsBlockInfo(self):
+ """Returns true if this block is a _BlockInfo.
+
+ This is convenient for verifying that an object is an instance of
+ a _BlockInfo, but not an instance of any of the derived classes.
+
+ Returns:
+ True for this class, False for derived classes.
+ """
+ return self.__class__ == _BlockInfo
+
+
+class _ExternCInfo(_BlockInfo):
+ """Stores information about an 'extern "C"' block."""
+
+ def __init__(self):
+ _BlockInfo.__init__(self, True)
+
class _ClassInfo(_BlockInfo):
"""Stores information about a class."""
@@ -1694,11 +1887,7 @@
# Remember initial indentation level for this class. Using raw_lines here
# instead of elided to account for leading comments.
- initial_indent = Match(r'^( *)\S', clean_lines.raw_lines[linenum])
- if initial_indent:
- self.class_indent = len(initial_indent.group(1))
- else:
- self.class_indent = 0
+ self.class_indent = GetIndentLevel(clean_lines.raw_lines[linenum])
# Try to find the end of the class. This will be confused by things like:
# class A {
@@ -1783,8 +1972,15 @@
else:
# Anonymous namespace
if not Match(r'};*\s*(//|/\*).*\bnamespace[\*/\.\\\s]*$', line):
- error(filename, linenum, 'readability/namespace', 5,
- 'Namespace should be terminated with "// namespace"')
+ # If "// namespace anonymous" or "// anonymous namespace (more text)",
+ # mention "// anonymous namespace" as an acceptable form
+ if Match(r'}.*\b(namespace anonymous|anonymous namespace)\b', line):
+ error(filename, linenum, 'readability/namespace', 5,
+ 'Anonymous namespace should be terminated with "// namespace"'
+ ' or "// anonymous namespace"')
+ else:
+ error(filename, linenum, 'readability/namespace', 5,
+ 'Anonymous namespace should be terminated with "// namespace"')
class _PreprocessorInfo(object):
@@ -1801,7 +1997,7 @@
self.seen_else = False
-class _NestingState(object):
+class NestingState(object):
"""Holds states related to parsing braces."""
def __init__(self):
@@ -1813,6 +2009,17 @@
# - _BlockInfo: some other type of block.
self.stack = []
+ # Top of the previous stack before each Update().
+ #
+ # Because the nesting_stack is updated at the end of each line, we
+ # had to do some convoluted checks to find out what is the current
+ # scope at the beginning of the line. This check is simplified by
+ # saving the previous top of nesting stack.
+ #
+ # We could save the full stack, but we only need the top. Copying
+ # the full nesting stack would slow down cpplint by ~10%.
+ self.previous_stack_top = []
+
# Stack of _PreprocessorInfo objects.
self.pp_stack = []
@@ -1833,6 +2040,82 @@
"""
return self.stack and isinstance(self.stack[-1], _NamespaceInfo)
+ def InExternC(self):
+ """Check if we are currently one level inside an 'extern "C"' block.
+
+ Returns:
+ True if top of the stack is an extern block, False otherwise.
+ """
+ return self.stack and isinstance(self.stack[-1], _ExternCInfo)
+
+ def InClassDeclaration(self):
+ """Check if we are currently one level inside a class or struct declaration.
+
+ Returns:
+ True if top of the stack is a class/struct, False otherwise.
+ """
+ return self.stack and isinstance(self.stack[-1], _ClassInfo)
+
+ def InAsmBlock(self):
+ """Check if we are currently one level inside an inline ASM block.
+
+ Returns:
+ True if the top of the stack is a block containing inline ASM.
+ """
+ return self.stack and self.stack[-1].inline_asm != _NO_ASM
+
+ def InTemplateArgumentList(self, clean_lines, linenum, pos):
+ """Check if current position is inside template argument list.
+
+ Args:
+ clean_lines: A CleansedLines instance containing the file.
+ linenum: The number of the line to check.
+ pos: position just after the suspected template argument.
+ Returns:
+ True if (linenum, pos) is inside template arguments.
+ """
+ while linenum < clean_lines.NumLines():
+ # Find the earliest character that might indicate a template argument
+ line = clean_lines.elided[linenum]
+ match = Match(r'^[^{};=\[\]\.<>]*(.)', line[pos:])
+ if not match:
+ linenum += 1
+ pos = 0
+ continue
+ token = match.group(1)
+ pos += len(match.group(0))
+
+ # These things do not look like template argument list:
+ # class Suspect {
+ # class Suspect x; }
+ if token in ('{', '}', ';'): return False
+
+ # These things look like template argument list:
+ # template <class Suspect>
+ # template <class Suspect = default_value>
+ # template <class Suspect[]>
+ # template <class Suspect...>
+ if token in ('>', '=', '[', ']', '.'): return True
+
+ # Check if token is an unmatched '<'.
+ # If not, move on to the next character.
+ if token != '<':
+ pos += 1
+ if pos >= len(line):
+ linenum += 1
+ pos = 0
+ continue
+
+ # We can't be sure if we just find a single '<', and need to
+ # find the matching '>'.
+ (_, end_line, end_pos) = CloseExpression(clean_lines, linenum, pos - 1)
+ if end_pos < 0:
+ # Not sure if template argument list or syntax error in file
+ return False
+ linenum = end_line
+ pos = end_pos
+ return False
+
def UpdatePreprocessor(self, line):
"""Update preprocessor stack.
@@ -1889,6 +2172,7 @@
# TODO(unknown): unexpected #endif, issue warning?
pass
+ # TODO(unknown): Update() is too long, but we will refactor later.
def Update(self, filename, clean_lines, linenum, error):
"""Update nesting state with current line.
@@ -1900,7 +2184,17 @@
"""
line = clean_lines.elided[linenum]
- # Update pp_stack first
+ # Remember top of the previous nesting stack.
+ #
+ # The stack is always pushed/popped and not modified in place, so
+ # we can just do a shallow copy instead of copy.deepcopy. Using
+ # deepcopy would slow down cpplint by ~28%.
+ if self.stack:
+ self.previous_stack_top = self.stack[-1]
+ else:
+ self.previous_stack_top = None
+
+ # Update pp_stack
self.UpdatePreprocessor(line)
# Count parentheses. This is to avoid adding struct arguments to
@@ -1951,32 +2245,27 @@
# such as in:
# class LOCKABLE API Object {
# };
- #
- # Templates with class arguments may confuse the parser, for example:
- # template <class T
- # class Comparator = less<T>,
- # class Vector = vector<T> >
- # class HeapQueue {
- #
- # Because this parser has no nesting state about templates, by the
- # time it saw "class Comparator", it may think that it's a new class.
- # Nested templates have a similar problem:
- # template <
- # typename ExportedType,
- # typename TupleType,
- # template <typename, typename> class ImplTemplate>
- #
- # To avoid these cases, we ignore classes that are followed by '=' or '>'
class_decl_match = Match(
- r'\s*(template\s*<[\w\s<>,:]*>\s*)?'
- r'(class|struct)\s+([A-Z_]+\s+)*(\w+(?:::\w+)*)'
- r'(([^=>]|<[^<>]*>|<[^<>]*<[^<>]*>\s*>)*)$', line)
+ r'^(\s*(?:template\s*<[\w\s<>,:]*>\s*)?'
+ r'(class|struct)\s+(?:[A-Z_]+\s+)*(\w+(?:::\w+)*))'
+ r'(.*)$', line)
if (class_decl_match and
(not self.stack or self.stack[-1].open_parentheses == 0)):
- self.stack.append(_ClassInfo(
- class_decl_match.group(4), class_decl_match.group(2),
- clean_lines, linenum))
- line = class_decl_match.group(5)
+ # We do not want to accept classes that are actually template arguments:
+ # template <class Ignore1,
+ # class Ignore2 = Default<Args>,
+ # template <Args> class Ignore3>
+ # void Function() {};
+ #
+ # To avoid template argument cases, we scan forward and look for
+ # an unmatched '>'. If we see one, assume we are inside a
+ # template argument list.
+ end_declaration = len(class_decl_match.group(1))
+ if not self.InTemplateArgumentList(clean_lines, linenum, end_declaration):
+ self.stack.append(_ClassInfo(
+ class_decl_match.group(3), class_decl_match.group(2),
+ clean_lines, linenum))
+ line = class_decl_match.group(4)
# If we have not yet seen the opening brace for the innermost block,
# run checks here.
@@ -2023,10 +2312,13 @@
# stack otherwise.
if not self.SeenOpenBrace():
self.stack[-1].seen_open_brace = True
+ elif Match(r'^extern\s*"[^"]*"\s*\{', line):
+ self.stack.append(_ExternCInfo())
else:
self.stack.append(_BlockInfo(True))
if _MATCH_ASM.match(line):
self.stack[-1].inline_asm = _BLOCK_ASM
+
elif token == ';' or token == ')':
# If we haven't seen an opening brace yet, but we already saw
# a semicolon, this is probably a forward declaration. Pop
@@ -2102,7 +2394,7 @@
filename: The name of the current file.
clean_lines: A CleansedLines instance containing the file.
linenum: The number of the line to check.
- nesting_state: A _NestingState instance which maintains information about
+ 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
@@ -2180,21 +2472,23 @@
line)
if (args and
args.group(1) != 'void' and
+ not Search(r'\bstd::initializer_list\b', args.group(1)) and
not Match(r'(const\s+)?%s(\s+const)?\s*(?:<\w+>\s*)?&'
% re.escape(base_classname), args.group(1).strip())):
error(filename, linenum, 'runtime/explicit', 5,
'Single-argument constructors should be marked explicit.')
-def CheckSpacingForFunctionCall(filename, line, linenum, error):
+def CheckSpacingForFunctionCall(filename, clean_lines, 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.
+ 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]
# Since function calls often occur inside if/for/while/switch
# expressions - which have their own, more liberal conventions - we
@@ -2237,10 +2531,16 @@
error(filename, linenum, 'whitespace/parens', 2,
'Extra space after (')
if (Search(r'\w\s+\(', fncall) and
- not Search(r'#\s*define|typedef', fncall) and
+ not Search(r'#\s*define|typedef|using\s+\w+\s*=', fncall) and
not Search(r'\w\s+\((\w+::)*\*\w+\)\(', fncall)):
- error(filename, linenum, 'whitespace/parens', 4,
- 'Extra space before ( in function call')
+ # TODO(unknown): Space after an operator function seem to be a common
+ # error, silence those for now by restricting them to highest verbosity.
+ if Search(r'\boperator_*\b', line):
+ error(filename, linenum, 'whitespace/parens', 0,
+ 'Extra space before ( in function call')
+ else:
+ error(filename, linenum, 'whitespace/parens', 4,
+ 'Extra space before ( in function call')
# If the ) is followed only by a newline or a { + newline, assume it's
# part of a control statement (if/while/etc), and don't complain
if Search(r'[^)]\s+\)\s*[^{\s]', fncall):
@@ -2294,8 +2594,6 @@
"""
lines = clean_lines.lines
line = lines[linenum]
- raw = clean_lines.raw_lines
- raw_line = raw[linenum]
joined_line = ''
starting_func = False
@@ -2342,34 +2640,58 @@
_RE_PATTERN_TODO = re.compile(r'^//(\s*)TODO(\(.+?\))?:?(\s|$)?')
-def CheckComment(comment, filename, linenum, error):
- """Checks for common mistakes in TODO comments.
+def CheckComment(line, filename, linenum, next_line_start, error):
+ """Checks for common mistakes in comments.
Args:
- comment: The text of the comment from the line in question.
+ line: The line in question.
filename: The name of the current file.
linenum: The number of the line to check.
+ next_line_start: The first non-whitespace column of the next line.
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')
+ commentpos = line.find('//')
+ if commentpos != -1:
+ # Check if the // may be in quotes. If so, ignore it
+ # Comparisons made explicit for clarity -- pylint: disable=g-explicit-bool-comparison
+ 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'^.*{ *//', line) and next_line_start == commentpos) 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')
- 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."')
+ # Checks for common mistakes in TODO comments.
+ comment = line[commentpos:]
+ 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')
- middle_whitespace = match.group(3)
- # Comparisons made explicit for correctness -- pylint: disable=g-explicit-bool-comparison
- if middle_whitespace != ' ' and middle_whitespace != '':
- error(filename, linenum, 'whitespace/todo', 2,
- 'TODO(my_username) should be followed by a space')
+ 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=g-explicit-bool-comparison
+ if middle_whitespace != ' ' and middle_whitespace != '':
+ error(filename, linenum, 'whitespace/todo', 2,
+ 'TODO(my_username) should be followed by a space')
+
+ # If the comment contains an alphanumeric character, there
+ # should be a space somewhere between it and the //.
+ if Match(r'//[^ ]*\w', comment):
+ error(filename, linenum, 'whitespace/comments', 4,
+ 'Should have a space between // and comment')
def CheckAccess(filename, clean_lines, linenum, nesting_state, error):
"""Checks for improper use of DISALLOW* macros.
@@ -2378,7 +2700,7 @@
filename: The name of the current file.
clean_lines: A CleansedLines instance containing the file.
linenum: The number of the line to check.
- nesting_state: A _NestingState instance which maintains information about
+ nesting_state: A NestingState instance which maintains information about
the current stack of nested blocks being parsed.
error: The function to call with any errors found.
"""
@@ -2402,132 +2724,6 @@
pass
-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:
- # Find the next operator that can tell us whether < is used as an
- # opening bracket or as a less-than operator. We only want to
- # warn on the latter case.
- #
- # We could also check all other operators and terminate the search
- # early, e.g. if we got something like this "a<b+c", the "<" is
- # most likely a less-than operator, but then we will get false
- # positives for default arguments and other template expressions.
- match = Search(r'^[^<>(),;\[\]]*([<>(),;\[\]])(.*)$', line)
- if match:
- # Found an operator, update nesting stack
- operator = match.group(1)
- line = match.group(2)
-
- if nesting_stack[-1] == '<':
- # Expecting closing angle bracket
- if operator in ('<', '(', '['):
- nesting_stack.append(operator)
- elif operator == '>':
- nesting_stack.pop()
- if not nesting_stack:
- # Found matching angle bracket
- return True
- elif operator == ',':
- # Got a comma after a bracket, this is most likely a template
- # argument. We have not seen a closing angle bracket yet, but
- # it's probably a few lines later if we look for it, so just
- # return early here.
- return True
- else:
- # Got some other operator.
- return False
-
- else:
- # Expecting closing parenthesis or closing bracket
- if operator in ('<', '(', '['):
- nesting_stack.append(operator)
- elif operator in (')', ']'):
- # We don't bother checking for matching () or []. If we got
- # something like (] or [), it would have been a syntax error.
- nesting_stack.pop()
-
- else:
- # Scan the next line
- linenum += 1
- if linenum >= len(clean_lines.elided):
- break
- line = clean_lines.elided[linenum]
-
- # Exhausted all remaining lines and still no matching angle bracket.
- # Most likely the input was incomplete, otherwise we should have
- # seen a semicolon and returned early.
- 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:
- # Find the previous operator
- match = Search(r'^(.*)([<>(),;\[\]])[^<>(),;\[\]]*$', line)
- if match:
- # Found an operator, update nesting stack
- operator = match.group(2)
- line = match.group(1)
-
- if nesting_stack[-1] == '>':
- # Expecting opening angle bracket
- if operator in ('>', ')', ']'):
- nesting_stack.append(operator)
- elif operator == '<':
- nesting_stack.pop()
- if not nesting_stack:
- # Found matching angle bracket
- return True
- elif operator == ',':
- # Got a comma before a bracket, this is most likely a
- # template argument. The opening angle bracket is probably
- # there if we look for it, so just return early here.
- return True
- else:
- # Got some other operator.
- return False
-
- else:
- # Expecting opening parenthesis or opening bracket
- if operator in ('>', ')', ']'):
- nesting_stack.append(operator)
- elif operator in ('(', '['):
- nesting_stack.pop()
-
- else:
- # Scan the previous line
- linenum -= 1
- if linenum < 0:
- break
- line = clean_lines.elided[linenum]
-
- # Exhausted all earlier lines and still no matching angle bracket.
- return False
-
-
def CheckSpacing(filename, clean_lines, linenum, nesting_state, error):
"""Checks for the correctness of various spacing issues in the code.
@@ -2541,7 +2737,7 @@
filename: The name of the current file.
clean_lines: A CleansedLines instance containing the file.
linenum: The number of the line to check.
- nesting_state: A _NestingState instance which maintains information about
+ nesting_state: A NestingState instance which maintains information about
the current stack of nested blocks being parsed.
error: The function to call with any errors found.
"""
@@ -2564,7 +2760,12 @@
# }
#
# A warning about missing end of namespace comments will be issued instead.
- if IsBlankLine(line) and not nesting_state.InNamespaceBody():
+ #
+ # Also skip blank line checks for 'extern "C"' blocks, which are formatted
+ # like namespaces.
+ if (IsBlankLine(line) and
+ not nesting_state.InNamespaceBody() and
+ not nesting_state.InExternC()):
elided = clean_lines.elided
prev_line = elided[linenum - 1]
prevbrace = prev_line.rfind('{')
@@ -2627,48 +2828,53 @@
error(filename, linenum, 'whitespace/blank_line', 3,
'Do not leave a blank line after "%s:"' % matched.group(1))
- # 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=g-explicit-bool-comparison
- 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 C++ style Doxygen comments placed after the variable:
- # ///< Header comment
- # //!< Header comment
- # 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:]) 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)
+ # Next, check comments
+ next_line_start = 0
+ if linenum + 1 < clean_lines.NumLines():
+ next_line = raw[linenum + 1]
+ next_line_start = len(next_line) - len(next_line.lstrip())
+ CheckComment(line, filename, linenum, next_line_start, error)
- line = clean_lines.elided[linenum] # get rid of comments and strings
+ # get rid of comments and strings
+ line = clean_lines.elided[linenum]
- # Don't try to do spacing checks for operator methods
- line = re.sub(r'operator(==|!=|<|<<|<=|>=|>>|>)\(', 'operator\(', line)
+ # You shouldn't have spaces before your brackets, except maybe after
+ # 'delete []' or 'return []() {};'
+ if Search(r'\w\s+\[', line) and not Search(r'(?:delete|return)\s+\[', line):
+ error(filename, linenum, 'whitespace/braces', 5,
+ 'Extra space before [')
+
+ # In range-based for, we wanted spaces before and after the colon, but
+ # not around "::" tokens that might appear.
+ if (Search(r'for *\(.*[^:]:[^: ]', line) or
+ Search(r'for *\(.*[^: ]:[^:]', line)):
+ error(filename, linenum, 'whitespace/forcolon', 2,
+ 'Missing space around colon in range-based for loop')
+
+
+def CheckOperatorSpacing(filename, clean_lines, linenum, error):
+ """Checks for horizontal spacing around operators.
+
+ 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]
+
+ # Don't try to do spacing checks for operator methods. Do this by
+ # replacing the troublesome characters with something else,
+ # preserving column position for all other characters.
+ #
+ # The replacement is done repeatedly to avoid false positives from
+ # operators that call operators.
+ while True:
+ match = Match(r'^(.*\boperator\b)(\S+)(\s*\(.*)$', line)
+ if match:
+ line = match.group(1) + ('_' * len(match.group(2))) + match.group(3)
+ else:
+ break
# We allow no-spaces around = within an if: "if ( (a=Foo()) == 0 )".
# Otherwise not. Note we only check for non-spaces on *both* sides;
@@ -2686,42 +2892,51 @@
#
# Check <= and >= first to avoid false positives with < and >, then
# check non-include lines for spacing around < and >.
- match = Search(r'[^<>=!\s](==|!=|<=|>=)[^<>=!\s]', line)
+ #
+ # If the operator is followed by a comma, assume it's be used in a
+ # macro context and don't do any checks. This avoids false
+ # positives.
+ #
+ # Note that && is not included here. Those are checked separately
+ # in CheckRValueReference
+ match = Search(r'[^<>=!\s](==|!=|<=|>=|\|\|)[^<>=!\s,;\)]', line)
if match:
error(filename, linenum, 'whitespace/operators', 3,
'Missing spaces around %s' % match.group(1))
- # We allow no-spaces around << when used like this: 10<<20, but
- # not otherwise (particularly, not when used as streams)
- # Also ignore using ns::operator<<;
- 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):
- # Avoid false positives on ->
- reduced_line = line.replace('->', '')
-
# Look for < that is not surrounded by spaces. This is only
# triggered if both sides are missing spaces, even though
# technically should should flag if at least one side is missing a
# space. This is done to avoid some false positives with shifts.
- match = Search(r'[^\s<]<([^\s=<].*)', reduced_line)
- if (match and
- not FindNextMatchingAngleBracket(clean_lines, linenum, match.group(1))):
- error(filename, linenum, 'whitespace/operators', 3,
- 'Missing spaces around <')
+ match = Match(r'^(.*[^\s<])<[^\s=<,]', line)
+ if match:
+ (_, _, end_pos) = CloseExpression(
+ clean_lines, linenum, len(match.group(1)))
+ if end_pos <= -1:
+ error(filename, linenum, 'whitespace/operators', 3,
+ 'Missing spaces around <')
# Look for > that is not surrounded by spaces. Similar to the
# above, we only trigger if both sides are missing spaces to avoid
# false positives with shifts.
- match = Search(r'^(.*[^\s>])>[^\s=>]', reduced_line)
- if (match and
- not FindPreviousMatchingAngleBracket(clean_lines, linenum,
- match.group(1))):
- error(filename, linenum, 'whitespace/operators', 3,
- 'Missing spaces around >')
+ match = Match(r'^(.*[^-\s>])>[^\s=>,]', line)
+ if match:
+ (_, _, start_pos) = ReverseCloseExpression(
+ clean_lines, linenum, len(match.group(1)))
+ if start_pos <= -1:
+ error(filename, linenum, 'whitespace/operators', 3,
+ 'Missing spaces around >')
+
+ # We allow no-spaces around << when used like this: 10<<20, but
+ # not otherwise (particularly, not when used as streams)
+ # We also allow operators following an opening parenthesis, since
+ # those tend to be macros that deal with operators.
+ match = Search(r'(operator|\S)(?:L|UL|ULL|l|ul|ull)?<<([^\s,=])', line)
+ if (match and match.group(1) != '(' 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 <<')
# We allow no-spaces around >> for almost anything. This is because
# C++11 allows ">>" to close nested templates, which accounts for
@@ -2746,7 +2961,19 @@
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
+
+def CheckParenthesisSpacing(filename, clean_lines, linenum, error):
+ """Checks for horizontal spacing around parentheses.
+
+ 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]
+
+ # 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,
@@ -2772,6 +2999,19 @@
'Should have zero or one spaces inside ( and ) in %s' %
match.group(1))
+
+def CheckCommaSpacing(filename, clean_lines, linenum, error):
+ """Checks for horizontal spacing near commas and semicolons.
+
+ 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 = clean_lines.elided[linenum]
+
# You should always have a space after a comma (either as fn arg or operator)
#
# This does not apply when the non-space character following the
@@ -2794,8 +3034,17 @@
error(filename, linenum, 'whitespace/semicolon', 3,
'Missing space after ;')
- # Next we will look for issues with function calls.
- CheckSpacingForFunctionCall(filename, line, linenum, error)
+
+def CheckBracesSpacing(filename, clean_lines, linenum, error):
+ """Checks for horizontal spacing near commas.
+
+ 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]
# Except after an opening paren, or after another opening brace (in case of
# an initializer list, for instance), you should have spaces before your
@@ -2812,10 +3061,12 @@
# LastArgument(..., type{});
# LOG(INFO) << type{} << " ...";
# map_of_type[{...}] = ...;
+ # ternary = expr ? new type{} : nullptr;
+ # OuterTemplate<InnerTemplateConstructor<Type>{}>
#
# We check for the character following the closing brace, and
# silence the warning if it's one of those listed above, i.e.
- # "{.;,)<]".
+ # "{.;,)<>]:".
#
# To account for nested initializer list, we allow any number of
# closing braces up to "{;,)<". We can't simply silence the
@@ -2837,7 +3088,7 @@
for offset in xrange(endlinenum + 1,
min(endlinenum + 3, clean_lines.NumLines() - 1)):
trailing_text += clean_lines.elided[offset]
- if not Match(r'^[\s}]*[{.;,)<\]]', trailing_text):
+ if not Match(r'^[\s}]*[{.;,)<>\]:]', trailing_text):
error(filename, linenum, 'whitespace/braces', 5,
'Missing space before {')
@@ -2846,12 +3097,6 @@
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.
@@ -2868,12 +3113,299 @@
'Extra space before last semicolon. If this should be an empty '
'statement, use {} instead.')
- # In range-based for, we wanted spaces before and after the colon, but
- # not around "::" tokens that might appear.
- if (Search('for *\(.*[^:]:[^: ]', line) or
- Search('for *\(.*[^: ]:[^:]', line)):
- error(filename, linenum, 'whitespace/forcolon', 2,
- 'Missing space around colon in range-based for loop')
+
+def IsDecltype(clean_lines, linenum, column):
+ """Check if the token ending on (linenum, column) is decltype().
+
+ Args:
+ clean_lines: A CleansedLines instance containing the file.
+ linenum: the number of the line to check.
+ column: end column of the token to check.
+ Returns:
+ True if this token is decltype() expression, False otherwise.
+ """
+ (text, _, start_col) = ReverseCloseExpression(clean_lines, linenum, column)
+ if start_col < 0:
+ return False
+ if Search(r'\bdecltype\s*$', text[0:start_col]):
+ return True
+ return False
+
+
+def IsTemplateParameterList(clean_lines, linenum, column):
+ """Check if the token ending on (linenum, column) is the end of template<>.
+
+ Args:
+ clean_lines: A CleansedLines instance containing the file.
+ linenum: the number of the line to check.
+ column: end column of the token to check.
+ Returns:
+ True if this token is end of a template parameter list, False otherwise.
+ """
+ (_, startline, startpos) = ReverseCloseExpression(
+ clean_lines, linenum, column)
+ if (startpos > -1 and
+ Search(r'\btemplate\s*$', clean_lines.elided[startline][0:startpos])):
+ return True
+ return False
+
+
+def IsRValueType(clean_lines, nesting_state, linenum, column):
+ """Check if the token ending on (linenum, column) is a type.
+
+ Assumes that text to the right of the column is "&&" or a function
+ name.
+
+ Args:
+ clean_lines: A CleansedLines instance containing the file.
+ nesting_state: A NestingState instance which maintains information about
+ the current stack of nested blocks being parsed.
+ linenum: the number of the line to check.
+ column: end column of the token to check.
+ Returns:
+ True if this token is a type, False if we are not sure.
+ """
+ prefix = clean_lines.elided[linenum][0:column]
+
+ # Get one word to the left. If we failed to do so, this is most
+ # likely not a type, since it's unlikely that the type name and "&&"
+ # would be split across multiple lines.
+ match = Match(r'^(.*)(\b\w+|[>*)&])\s*$', prefix)
+ if not match:
+ return False
+
+ # Check text following the token. If it's "&&>" or "&&," or "&&...", it's
+ # most likely a rvalue reference used inside a template.
+ suffix = clean_lines.elided[linenum][column:]
+ if Match(r'&&\s*(?:[>,]|\.\.\.)', suffix):
+ return True
+
+ # Check for simple type and end of templates:
+ # int&& variable
+ # vector<int>&& variable
+ #
+ # Because this function is called recursively, we also need to
+ # recognize pointer and reference types:
+ # int* Function()
+ # int& Function()
+ if match.group(2) in ['char', 'char16_t', 'char32_t', 'wchar_t', 'bool',
+ 'short', 'int', 'long', 'signed', 'unsigned',
+ 'float', 'double', 'void', 'auto', '>', '*', '&']:
+ return True
+
+ # If we see a close parenthesis, look for decltype on the other side.
+ # decltype would unambiguously identify a type, anything else is
+ # probably a parenthesized expression and not a type.
+ if match.group(2) == ')':
+ return IsDecltype(
+ clean_lines, linenum, len(match.group(1)) + len(match.group(2)) - 1)
+
+ # Check for casts and cv-qualifiers.
+ # match.group(1) remainder
+ # -------------- ---------
+ # const_cast< type&&
+ # const type&&
+ # type const&&
+ if Search(r'\b(?:const_cast\s*<|static_cast\s*<|dynamic_cast\s*<|'
+ r'reinterpret_cast\s*<|\w+\s)\s*$',
+ match.group(1)):
+ return True
+
+ # Look for a preceding symbol that might help differentiate the context.
+ # These are the cases that would be ambiguous:
+ # match.group(1) remainder
+ # -------------- ---------
+ # Call ( expression &&
+ # Declaration ( type&&
+ # sizeof ( type&&
+ # if ( expression &&
+ # while ( expression &&
+ # for ( type&&
+ # for( ; expression &&
+ # statement ; type&&
+ # block { type&&
+ # constructor { expression &&
+ start = linenum
+ line = match.group(1)
+ match_symbol = None
+ while start >= 0:
+ # We want to skip over identifiers and commas to get to a symbol.
+ # Commas are skipped so that we can find the opening parenthesis
+ # for function parameter lists.
+ match_symbol = Match(r'^(.*)([^\w\s,])[\w\s,]*$', line)
+ if match_symbol:
+ break
+ start -= 1
+ line = clean_lines.elided[start]
+
+ if not match_symbol:
+ # Probably the first statement in the file is an rvalue reference
+ return True
+
+ if match_symbol.group(2) == '}':
+ # Found closing brace, probably an indicate of this:
+ # block{} type&&
+ return True
+
+ if match_symbol.group(2) == ';':
+ # Found semicolon, probably one of these:
+ # for(; expression &&
+ # statement; type&&
+
+ # Look for the previous 'for(' in the previous lines.
+ before_text = match_symbol.group(1)
+ for i in xrange(start - 1, max(start - 6, 0), -1):
+ before_text = clean_lines.elided[i] + before_text
+ if Search(r'for\s*\([^{};]*$', before_text):
+ # This is the condition inside a for-loop
+ return False
+
+ # Did not find a for-init-statement before this semicolon, so this
+ # is probably a new statement and not a condition.
+ return True
+
+ if match_symbol.group(2) == '{':
+ # Found opening brace, probably one of these:
+ # block{ type&& = ... ; }
+ # constructor{ expression && expression }
+
+ # Look for a closing brace or a semicolon. If we see a semicolon
+ # first, this is probably a rvalue reference.
+ line = clean_lines.elided[start][0:len(match_symbol.group(1)) + 1]
+ end = start
+ depth = 1
+ while True:
+ for ch in line:
+ if ch == ';':
+ return True
+ elif ch == '{':
+ depth += 1
+ elif ch == '}':
+ depth -= 1
+ if depth == 0:
+ return False
+ end += 1
+ if end >= clean_lines.NumLines():
+ break
+ line = clean_lines.elided[end]
+ # Incomplete program?
+ return False
+
+ if match_symbol.group(2) == '(':
+ # Opening parenthesis. Need to check what's to the left of the
+ # parenthesis. Look back one extra line for additional context.
+ before_text = match_symbol.group(1)
+ if linenum > 1:
+ before_text = clean_lines.elided[linenum - 1] + before_text
+ before_text = match_symbol.group(1)
+
+ # Patterns that are likely to be types:
+ # [](type&&
+ # for (type&&
+ # sizeof(type&&
+ # operator=(type&&
+ #
+ if Search(r'(?:\]|\bfor|\bsizeof|\boperator\s*\S+\s*)\s*$', before_text):
+ return True
+
+ # Patterns that are likely to be expressions:
+ # if (expression &&
+ # while (expression &&
+ # : initializer(expression &&
+ # , initializer(expression &&
+ # ( FunctionCall(expression &&
+ # + FunctionCall(expression &&
+ # + (expression &&
+ #
+ # The last '+' represents operators such as '+' and '-'.
+ if Search(r'(?:\bif|\bwhile|[-+=%^(<!?:,&*]\s*)$', before_text):
+ return False
+
+ # Something else. Check that tokens to the left look like
+ # return_type function_name
+ match_func = Match(r'^(.*)\s+\w(?:\w|::)*(?:<[^<>]*>)?\s*$',
+ match_symbol.group(1))
+ if match_func:
+ # Check for constructors, which don't have return types.
+ if Search(r'\bexplicit$', match_func.group(1)):
+ return True
+ implicit_constructor = Match(r'\s*(\w+)\((?:const\s+)?(\w+)', prefix)
+ if (implicit_constructor and
+ implicit_constructor.group(1) == implicit_constructor.group(2)):
+ return True
+ return IsRValueType(clean_lines, nesting_state, linenum,
+ len(match_func.group(1)))
+
+ # Nothing before the function name. If this is inside a block scope,
+ # this is probably a function call.
+ return not (nesting_state.previous_stack_top and
+ nesting_state.previous_stack_top.IsBlockInfo())
+
+ if match_symbol.group(2) == '>':
+ # Possibly a closing bracket, check that what's on the other side
+ # looks like the start of a template.
+ return IsTemplateParameterList(
+ clean_lines, start, len(match_symbol.group(1)))
+
+ # Some other symbol, usually something like "a=b&&c". This is most
+ # likely not a type.
+ return False
+
+
+def IsRValueAllowed(clean_lines, linenum):
+ """Check if RValue reference is allowed within some range of lines.
+
+ Args:
+ clean_lines: A CleansedLines instance containing the file.
+ linenum: The number of the line to check.
+ Returns:
+ True if line is within the region where RValue references are allowed.
+ """
+ for i in xrange(linenum, 0, -1):
+ line = clean_lines.elided[i]
+ if Match(r'GOOGLE_ALLOW_RVALUE_REFERENCES_(?:PUSH|POP)', line):
+ if not line.endswith('PUSH'):
+ return False
+ for j in xrange(linenum, clean_lines.NumLines(), 1):
+ line = clean_lines.elided[j]
+ if Match(r'GOOGLE_ALLOW_RVALUE_REFERENCES_(?:PUSH|POP)', line):
+ return line.endswith('POP')
+ return False
+
+
+def CheckRValueReference(filename, clean_lines, linenum, nesting_state, error):
+ """Check for rvalue references.
+
+ Args:
+ filename: The name of the current file.
+ clean_lines: A CleansedLines instance containing the file.
+ linenum: The number of the line to check.
+ nesting_state: A NestingState instance which maintains information about
+ the current stack of nested blocks being parsed.
+ error: The function to call with any errors found.
+ """
+ # Find lines missing spaces around &&.
+ # TODO(unknown): currently we don't check for rvalue references
+ # with spaces surrounding the && to avoid false positives with
+ # boolean expressions.
+ line = clean_lines.elided[linenum]
+ match = Match(r'^(.*\S)&&', line)
+ if not match:
+ match = Match(r'(.*)&&\S', line)
+ if (not match) or '(&&)' in line or Search(r'\boperator\s*$', match.group(1)):
+ return
+
+ # Either poorly formed && or an rvalue reference, check the context
+ # to get a more accurate error message. Mostly we want to determine
+ # if what's to the left of "&&" is a type or not.
+ and_pos = len(match.group(1))
+ if IsRValueType(clean_lines, nesting_state, linenum, and_pos):
+ if not IsRValueAllowed(clean_lines, linenum):
+ error(filename, linenum, 'build/c++11', 3,
+ 'RValue references are an unapproved C++ feature.')
+ else:
+ error(filename, linenum, 'whitespace/operators', 3,
+ 'Missing spaces around &&')
def CheckSectionSpacing(filename, clean_lines, class_info, linenum, error):
@@ -2981,7 +3513,7 @@
'{ should almost always be at the end of the previous line')
# An else clause should be on the same line as the preceding closing brace.
- if Match(r'\s*else\s*', line):
+ if Match(r'\s*else\b\s*(?:if\b|\{|$)', line):
prevline = GetPreviousNonBlankLine(clean_lines, linenum)[0]
if Match(r'\s*}\s*$', prevline):
error(filename, linenum, 'whitespace/newline', 4,
@@ -2989,19 +3521,20 @@
# If braces come on one side of an else, they should be on both.
# However, we have to worry about "else if" that spans multiple lines!
- if Search(r'}\s*else[^{]*$', 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')
+ if Search(r'else if\s*\(', line): # could be multi-line if
+ brace_on_left = bool(Search(r'}\s*else if\s*\(', line))
+ # find the ( after the if
+ pos = line.find('else if')
+ pos = line.find('(', pos)
+ if pos > 0:
+ (endline, _, endpos) = CloseExpression(clean_lines, linenum, pos)
+ brace_on_right = endline[endpos:].find('{') != -1
+ if brace_on_left != brace_on_right: # 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')
+ elif Search(r'}\s*else[^{]*$', line) or Match(r'[^}]*else\s*{', line):
+ 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):
@@ -3013,6 +3546,70 @@
error(filename, linenum, 'whitespace/newline', 4,
'do/while clauses should not be on a single line')
+ # Check single-line if/else bodies. The style guide says 'curly braces are not
+ # required for single-line statements'. We additionally allow multi-line,
+ # single statements, but we reject anything with more than one semicolon in
+ # it. This means that the first semicolon after the if should be at the end of
+ # its line, and the line after that should have an indent level equal to or
+ # lower than the if. We also check for ambiguous if/else nesting without
+ # braces.
+ if_else_match = Search(r'\b(if\s*\(|else\b)', line)
+ if if_else_match and not Match(r'\s*#', line):
+ if_indent = GetIndentLevel(line)
+ endline, endlinenum, endpos = line, linenum, if_else_match.end()
+ if_match = Search(r'\bif\s*\(', line)
+ if if_match:
+ # This could be a multiline if condition, so find the end first.
+ pos = if_match.end() - 1
+ (endline, endlinenum, endpos) = CloseExpression(clean_lines, linenum, pos)
+ # Check for an opening brace, either directly after the if or on the next
+ # line. If found, this isn't a single-statement conditional.
+ if (not Match(r'\s*{', endline[endpos:])
+ and not (Match(r'\s*$', endline[endpos:])
+ and endlinenum < (len(clean_lines.elided) - 1)
+ and Match(r'\s*{', clean_lines.elided[endlinenum + 1]))):
+ while (endlinenum < len(clean_lines.elided)
+ and ';' not in clean_lines.elided[endlinenum][endpos:]):
+ endlinenum += 1
+ endpos = 0
+ if endlinenum < len(clean_lines.elided):
+ endline = clean_lines.elided[endlinenum]
+ # We allow a mix of whitespace and closing braces (e.g. for one-liner
+ # methods) and a single \ after the semicolon (for macros)
+ endpos = endline.find(';')
+ if not Match(r';[\s}]*(\\?)$', endline[endpos:]):
+ # Semicolon isn't the last character, there's something trailing
+ error(filename, linenum, 'readability/braces', 4,
+ 'If/else bodies with multiple statements require braces')
+ elif endlinenum < len(clean_lines.elided) - 1:
+ # Make sure the next line is dedented
+ next_line = clean_lines.elided[endlinenum + 1]
+ next_indent = GetIndentLevel(next_line)
+ # With ambiguous nested if statements, this will error out on the
+ # if that *doesn't* match the else, regardless of whether it's the
+ # inner one or outer one.
+ if (if_match and Match(r'\s*else\b', next_line)
+ and next_indent != if_indent):
+ error(filename, linenum, 'readability/braces', 4,
+ 'Else clause should be indented at the same level as if. '
+ 'Ambiguous nested if/else chains require braces.')
+ elif next_indent > if_indent:
+ error(filename, linenum, 'readability/braces', 4,
+ 'If/else bodies with multiple statements require braces')
+
+
+def CheckTrailingSemicolon(filename, clean_lines, linenum, error):
+ """Looks for redundant trailing semicolon.
+
+ 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]
+
# Block bodies should not be followed by a semicolon. Due to C++11
# brace initialization, there are more places where semicolons are
# required than not, so we use a whitelist approach to check these
@@ -3081,20 +3678,27 @@
# would result in compile errors.
#
# In addition to macros, we also don't want to warn on compound
- # literals.
+ # literals and lambdas.
closing_brace_pos = match.group(1).rfind(')')
opening_parenthesis = ReverseCloseExpression(
clean_lines, linenum, closing_brace_pos)
if opening_parenthesis[2] > -1:
line_prefix = opening_parenthesis[0][0:opening_parenthesis[2]]
macro = Search(r'\b([A-Z_]+)\s*$', line_prefix)
+ func = Match(r'^(.*\])\s*$', line_prefix)
if ((macro and
macro.group(1) not in (
'TEST', 'TEST_F', 'MATCHER', 'MATCHER_P', 'TYPED_TEST',
'EXCLUSIVE_LOCKS_REQUIRED', 'SHARED_LOCKS_REQUIRED',
'LOCKS_EXCLUDED', 'INTERFACE_DEF')) or
+ (func and not Search(r'\boperator\s*\[\s*\]', func.group(1))) or
Search(r'\s+=\s*$', line_prefix)):
match = None
+ if (match and
+ opening_parenthesis[1] > 1 and
+ Search(r'\]\s*$', clean_lines.elided[opening_parenthesis[1] - 1])):
+ # Multi-line lambda-expression
+ match = None
else:
# Try matching cases 2-3.
@@ -3163,6 +3767,29 @@
'Empty loop bodies should use {} or continue')
+def FindCheckMacro(line):
+ """Find a replaceable CHECK-like macro.
+
+ Args:
+ line: line to search on.
+ Returns:
+ (macro name, start position), or (None, -1) if no replaceable
+ macro is found.
+ """
+ for macro in _CHECK_MACROS:
+ i = line.find(macro)
+ if i >= 0:
+ # Find opening parenthesis. Do a regular expression match here
+ # to make sure that we are matching the expected CHECK macro, as
+ # opposed to some other macro that happens to contain the CHECK
+ # substring.
+ matched = Match(r'^(.*\b' + macro + r'\s*)\(', line)
+ if not matched:
+ continue
+ return (macro, len(matched.group(1)))
+ return (None, -1)
+
+
def CheckCheck(filename, clean_lines, linenum, error):
"""Checks the use of CHECK and EXPECT macros.
@@ -3175,24 +3802,8 @@
# Decide the set of replacement macros that should be suggested
lines = clean_lines.elided
- check_macro = None
- start_pos = -1
- for macro in _CHECK_MACROS:
- i = lines[linenum].find(macro)
- if i >= 0:
- check_macro = macro
-
- # Find opening parenthesis. Do a regular expression match here
- # to make sure that we are matching the expected CHECK macro, as
- # opposed to some other macro that happens to contain the CHECK
- # substring.
- matched = Match(r'^(.*\b' + check_macro + r'\s*)\(', lines[linenum])
- if not matched:
- continue
- start_pos = len(matched.group(1))
- break
- if not check_macro or start_pos < 0:
- # Don't waste time here if line doesn't contain 'CHECK' or 'EXPECT'
+ (check_macro, start_pos) = FindCheckMacro(lines[linenum])
+ if not check_macro:
return
# Find end of the boolean expression by matching parentheses
@@ -3222,7 +3833,7 @@
if token == '(':
# Parenthesized operand
expression = matched.group(2)
- (end, _) = FindEndOfExpressionInLine(expression, 0, 1, '(', ')')
+ (end, _) = FindEndOfExpressionInLine(expression, 0, ['('])
if end < 0:
return # Unmatched parenthesis
lhs += '(' + expression[0:end]
@@ -3357,7 +3968,7 @@
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.
- nesting_state: A _NestingState instance which maintains information about
+ nesting_state: A NestingState instance which maintains information about
the current stack of nested blocks being parsed.
error: The function to call with any errors found.
"""
@@ -3384,6 +3995,8 @@
# if(match($0, " <<")) complain = 0;
# if(match(prev, " +for \\(")) complain = 0;
# if(prevodd && match(prevprev, " +for \\(")) complain = 0;
+ scope_or_label_pattern = r'\s*\w+\s*:\s*\\?$'
+ classinfo = nesting_state.InnermostClass()
initial_spaces = 0
cleansed_line = clean_lines.elided[linenum]
while initial_spaces < len(line) and line[initial_spaces] == ' ':
@@ -3391,9 +4004,12 @@
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 section labels
+ # There are certain situations we allow one space, notably for
+ # section labels, and also lines containing multi-line raw strings.
elif ((initial_spaces == 1 or initial_spaces == 3) and
- not Match(r'\s*\w+\s*:\s*$', cleansed_line)):
+ not Match(scope_or_label_pattern, cleansed_line) and
+ not (clean_lines.raw_lines[linenum] != line and
+ Match(r'^\s*""', line))):
error(filename, linenum, 'whitespace/indent', 3,
'Weird number of spaces at line-start. '
'Are you using a 2-space indent?')
@@ -3441,9 +4057,16 @@
# Some more style checks
CheckBraces(filename, clean_lines, linenum, error)
+ CheckTrailingSemicolon(filename, clean_lines, linenum, error)
CheckEmptyBlockBody(filename, clean_lines, linenum, error)
CheckAccess(filename, clean_lines, linenum, nesting_state, error)
CheckSpacing(filename, clean_lines, linenum, nesting_state, error)
+ CheckOperatorSpacing(filename, clean_lines, linenum, error)
+ CheckParenthesisSpacing(filename, clean_lines, linenum, error)
+ CheckCommaSpacing(filename, clean_lines, linenum, error)
+ CheckBracesSpacing(filename, clean_lines, linenum, error)
+ CheckSpacingForFunctionCall(filename, clean_lines, linenum, error)
+ CheckRValueReference(filename, clean_lines, linenum, nesting_state, error)
CheckCheck(filename, clean_lines, linenum, error)
CheckAltTokens(filename, clean_lines, linenum, error)
classinfo = nesting_state.InnermostClass()
@@ -3580,7 +4203,6 @@
error: The function to call with any errors found.
"""
fileinfo = FileInfo(filename)
-
line = clean_lines.lines[linenum]
# "include" should use the new style "foo/bar.h" instead of just "bar.h"
@@ -3633,8 +4255,13 @@
if Match(r'(f|ind|io|i|o|parse|pf|stdio|str|)?stream$', include):
# Many unit tests use cout, so we exempt them.
if not _IsTestFilename(filename):
- error(filename, linenum, 'readability/streams', 3,
- 'Streams are highly discouraged.')
+ # Suggest a different header for ostream
+ if include == 'ostream':
+ error(filename, linenum, 'readability/streams', 3,
+ 'For logging, include "base/logging.h" instead of <ostream>.')
+ else:
+ error(filename, linenum, 'readability/streams', 3,
+ 'Streams are highly discouraged.')
def _GetTextInside(text, start_pattern):
@@ -3657,7 +4284,7 @@
The extracted text.
None if either the opening string or ending punctuation could not be found.
"""
- # TODO(sugawarayu): Audit cpplint.py to see what places could be profitably
+ # TODO(unknown): Audit cpplint.py to see what places could be profitably
# rewritten to use _GetTextInside (and use inferior regexp matching today).
# Give opening punctuations to get the matching close-punctuations.
@@ -3732,7 +4359,7 @@
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.
- nesting_state: A _NestingState instance which maintains information about
+ nesting_state: A NestingState instance which maintains information about
the current stack of nested blocks being parsed.
error: The function to call with any errors found.
"""
@@ -3754,118 +4381,11 @@
# 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 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)'
- r'(\([^)].*)', line)
- if match:
- matched_new = match.group(1)
- matched_type = match.group(2)
- matched_funcptr = match.group(3)
-
- # 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. Likewise, gMock's
- # MockCallback takes a template parameter of the form return_type(arg_type),
- # which looks much like the cast we're trying to detect.
- #
- # std::function<> wrapper has a similar problem.
- #
- # Return types for function pointers also look like casts if they
- # don't have an extra space.
- if (matched_new is None and # If new operator, then this isn't a cast
- not (Match(r'^\s*MOCK_(CONST_)?METHOD\d+(_T)?\(', line) or
- Search(r'\bMockCallback<.*>', line) or
- Search(r'\bstd::function<.*>', line)) and
- not (matched_funcptr and
- Match(r'\((?:[^() ]+::\s*\*\s*)?[^() ]+\)\s*\(',
- matched_funcptr))):
- # Try a bit harder to catch gmock lines: the only place where
- # something looks like an old-style cast is where we declare the
- # return type of the mocked method, and the only time when we
- # are missing context is if MOCK_METHOD was split across
- # multiple lines. The missing MOCK_METHOD is usually one or two
- # lines back, so scan back one or two lines.
- #
- # It's not possible for gmock macros to appear in the first 2
- # lines, since the class head + section name takes up 2 lines.
- if (linenum < 2 or
- not (Match(r'^\s*MOCK_(?:CONST_)?METHOD\d+(?:_T)?\((?:\S+,)?\s*$',
- clean_lines.elided[linenum - 1]) or
- Match(r'^\s*MOCK_(?:CONST_)?METHOD\d+(?:_T)?\(\s*$',
- clean_lines.elided[linenum - 2]))):
- error(filename, linenum, 'readability/casting', 4,
- 'Using deprecated casting style. '
- 'Use static_cast<%s>(...) instead' %
- matched_type)
-
- 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".
- #
- # (char *) "foo" should always be a const_cast (reinterpret_cast won't
- # compile).
- if CheckCStyleCast(filename, linenum, line, clean_lines.raw_lines[linenum],
- 'const_cast', r'\((char\s?\*+\s?)\)\s*"', error):
- pass
- else:
- # Check pointer casts for other than string constants
- 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.
- match = Search(
- r'(?:&\(([^)]+)\)[\w(])|'
- r'(?:&(static|dynamic|down|reinterpret)_cast\b)', line)
- if match and match.group(1) != '*':
- 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'))
-
- # 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
-
- # 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(...".
- #
- # Also ignore things that look like operators. These are matched separately
- # because operator names cross non-word boundaries. If we change the pattern
- # above, we would decrease the accuracy of matching identifiers.
- if (match and
- not Search(r'\boperator\W', line) 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)))
-
- 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.')
+
+ # Perform other checks now that we are sure that this is not an include line
+ CheckCasts(filename, clean_lines, linenum, error)
+ CheckGlobalStatic(filename, clean_lines, linenum, error)
+ CheckPrintf(filename, clean_lines, linenum, error)
if file_extension == 'h':
# TODO(unknown): check that 1-arg constructors are explicit.
@@ -3887,23 +4407,6 @@
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))
-
# Check if some verboten operator overloading is going on
# TODO(unknown): catch out-of-line unary operator&:
# class X {};
@@ -3923,7 +4426,7 @@
# 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())
- # TODO(sugawarayu): Catch the following case. Need to change the calling
+ # TODO(unknown): Catch the following case. Need to change the calling
# convention of the whole function to process multiple line to handle it.
# printf(
# boy_this_is_a_really_long_variable_that_cannot_fit_on_the_prev_line);
@@ -4019,6 +4522,144 @@
'http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml#Namespaces'
' for more information.')
+
+def CheckGlobalStatic(filename, clean_lines, linenum, error):
+ """Check for unsafe global or static objects.
+
+ 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]
+
+ # 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)
+ # Remove false positives:
+ # - String pointers (as opposed to values).
+ # string *pointer
+ # const string *pointer
+ # string const *pointer
+ # string *const pointer
+ #
+ # - Functions and template specializations.
+ # string Function<Type>(...
+ # string Class<Type>::Method(...
+ #
+ # - Operators. These are matched separately because operator names
+ # cross non-word boundaries, and trying to match both operators
+ # and functions at the same time would decrease accuracy of
+ # matching identifiers.
+ # string Class::operator*()
+ if (match and
+ not Search(r'\bstring\b(\s+const)?\s*\*\s*(const\s+)?\w', line) and
+ not Search(r'\boperator\W', line) 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)))
+
+ 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.')
+
+
+def CheckPrintf(filename, clean_lines, linenum, error):
+ """Check for printf related issues.
+
+ 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]
+
+ # 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))
+
+
+def IsDerivedFunction(clean_lines, linenum):
+ """Check if current line contains an inherited function.
+
+ Args:
+ clean_lines: A CleansedLines instance containing the file.
+ linenum: The number of the line to check.
+ Returns:
+ True if current line contains a function with "override"
+ virt-specifier.
+ """
+ # Look for leftmost opening parenthesis on current line
+ opening_paren = clean_lines.elided[linenum].find('(')
+ if opening_paren < 0: return False
+
+ # Look for "override" after the matching closing parenthesis
+ line, _, closing_paren = CloseExpression(clean_lines, linenum, opening_paren)
+ return closing_paren >= 0 and Search(r'\boverride\b', line[closing_paren:])
+
+
+def IsInitializerList(clean_lines, linenum):
+ """Check if current line is inside constructor initializer list.
+
+ Args:
+ clean_lines: A CleansedLines instance containing the file.
+ linenum: The number of the line to check.
+ Returns:
+ True if current line appears to be inside constructor initializer
+ list, False otherwise.
+ """
+ for i in xrange(linenum, 1, -1):
+ line = clean_lines.elided[i]
+ if i == linenum:
+ remove_function_body = Match(r'^(.*)\{\s*$', line)
+ if remove_function_body:
+ line = remove_function_body.group(1)
+
+ if Search(r'\s:\s*\w+[({]', line):
+ # A lone colon tend to indicate the start of a constructor
+ # initializer list. It could also be a ternary operator, which
+ # also tend to appear in constructor initializer lists as
+ # opposed to parameter lists.
+ return True
+ if Search(r'\}\s*,\s*$', line):
+ # A closing brace followed by a comma is probably the end of a
+ # brace-initialized member in constructor initializer list.
+ return True
+ if Search(r'[{};]\s*$', line):
+ # Found one of the following:
+ # - A closing brace or semicolon, probably the end of the previous
+ # function.
+ # - An opening brace, probably the start of current class or namespace.
+ #
+ # Current line is probably not inside an initializer list since
+ # we saw one of those things without seeing the starting colon.
+ return False
+
+ # Got to the beginning of the file without seeing the start of
+ # constructor initializer list.
+ return False
+
+
def CheckForNonConstReference(filename, clean_lines, linenum,
nesting_state, error):
"""Check for non-const references.
@@ -4030,7 +4671,7 @@
filename: The name of the current file.
clean_lines: A CleansedLines instance containing the file.
linenum: The number of the line to check.
- nesting_state: A _NestingState instance which maintains information about
+ nesting_state: A NestingState instance which maintains information about
the current stack of nested blocks being parsed.
error: The function to call with any errors found.
"""
@@ -4039,6 +4680,12 @@
if '&' not in line:
return
+ # If a function is inherited, current function doesn't have much of
+ # a choice, so any non-const references should not be blamed on
+ # derived function.
+ if IsDerivedFunction(clean_lines, linenum):
+ return
+
# Long type names may be broken across multiple lines, usually in one
# of these forms:
# LongType
@@ -4087,19 +4734,21 @@
# inside declarators: reference parameter
# We will exclude the first two cases by checking that we are not inside a
# function body, including one that was just introduced by a trailing '{'.
- # TODO(unknwon): Doesn't account for preprocessor directives.
# TODO(unknown): Doesn't account for 'catch(Exception& e)' [rare].
- check_params = False
- if not nesting_state.stack:
- check_params = True # top level
- elif (isinstance(nesting_state.stack[-1], _ClassInfo) or
- isinstance(nesting_state.stack[-1], _NamespaceInfo)):
- check_params = True # within class or namespace
- elif Match(r'.*{\s*$', line):
- if (len(nesting_state.stack) == 1 or
- isinstance(nesting_state.stack[-2], _ClassInfo) or
- isinstance(nesting_state.stack[-2], _NamespaceInfo)):
- check_params = True # just opened global/class/namespace block
+ if (nesting_state.previous_stack_top and
+ not (isinstance(nesting_state.previous_stack_top, _ClassInfo) or
+ isinstance(nesting_state.previous_stack_top, _NamespaceInfo))):
+ # Not at toplevel, not within a class, and not within a namespace
+ return
+
+ # Avoid preprocessors
+ if Search(r'\\\s*$', line):
+ return
+
+ # Avoid constructor initializer lists
+ if IsInitializerList(clean_lines, linenum):
+ return
+
# We allow non-const references in a few standard places, like functions
# called "swap()" or iostream operators like "<<" or ">>". Do not check
# those function parameters.
@@ -4111,7 +4760,7 @@
r'static_assert|COMPILE_ASSERT'
r')\s*\(')
if Search(whitelisted_functions, line):
- check_params = False
+ return
elif not Search(r'\S+\([^)]*$', line):
# Don't see a whitelisted function on this line. Actually we
# didn't see any function name on this line, so this is likely a
@@ -4119,17 +4768,122 @@
for i in xrange(2):
if (linenum > i and
Search(whitelisted_functions, clean_lines.elided[linenum - i - 1])):
- check_params = False
- break
+ return
- if check_params:
- decls = ReplaceAll(r'{[^}]*}', ' ', line) # exclude function body
- for parameter in re.findall(_RE_PATTERN_REF_PARAM, decls):
- if not Match(_RE_PATTERN_CONST_REF_PARAM, parameter):
- error(filename, linenum, 'runtime/references', 2,
- 'Is this a non-const reference? '
- 'If so, make const or use a pointer: ' +
- ReplaceAll(' *<', '<', parameter))
+ decls = ReplaceAll(r'{[^}]*}', ' ', line) # exclude function body
+ for parameter in re.findall(_RE_PATTERN_REF_PARAM, decls):
+ if not Match(_RE_PATTERN_CONST_REF_PARAM, parameter):
+ error(filename, linenum, 'runtime/references', 2,
+ 'Is this a non-const reference? '
+ 'If so, make const or use a pointer: ' +
+ ReplaceAll(' *<', '<', parameter))
+
+
+def CheckCasts(filename, clean_lines, linenum, error):
+ """Various cast related checks.
+
+ 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]
+
+ # 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+|\S<\s*(?:const\s+)?)?\b'
+ r'(int|float|double|bool|char|int32|uint32|int64|uint64)'
+ r'(\([^)].*)', line)
+ expecting_function = ExpectingFunctionArgs(clean_lines, linenum)
+ if match and not expecting_function:
+ matched_type = match.group(2)
+
+ # matched_new_or_template is used to silence two false positives:
+ # - New operators
+ # - Template arguments with function types
+ #
+ # For template arguments, we match on types immediately following
+ # an opening bracket without any spaces. This is a fast way to
+ # silence the common case where the function type is the first
+ # template argument. False negative with less-than comparison is
+ # avoided because those operators are usually followed by a space.
+ #
+ # function<double(double)> // bracket + no space = false positive
+ # value < double(42) // bracket + space = true positive
+ matched_new_or_template = match.group(1)
+
+ # Other things to ignore:
+ # - Function pointers
+ # - Casts to pointer types
+ # - Placement new
+ # - Alias declarations
+ matched_funcptr = match.group(3)
+ if (matched_new_or_template is None and
+ not (matched_funcptr and
+ (Match(r'\((?:[^() ]+::\s*\*\s*)?[^() ]+\)\s*\(',
+ matched_funcptr) or
+ matched_funcptr.startswith('(*)'))) and
+ not Match(r'\s*using\s+\S+\s*=\s*' + matched_type, line) and
+ not Search(r'new\(\S+\)\s*' + matched_type, line)):
+ error(filename, linenum, 'readability/casting', 4,
+ 'Using deprecated casting style. '
+ 'Use static_cast<%s>(...) instead' %
+ matched_type)
+
+ if not expecting_function:
+ 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".
+ #
+ # (char *) "foo" should always be a const_cast (reinterpret_cast won't
+ # compile).
+ if CheckCStyleCast(filename, linenum, line, clean_lines.raw_lines[linenum],
+ 'const_cast', r'\((char\s?\*+\s?)\)\s*"', error):
+ pass
+ else:
+ # Check pointer casts for other than string constants
+ 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.
+ match = Search(
+ r'(?:&\(([^)]+)\)[\w(])|'
+ r'(?:&(static|dynamic|down|reinterpret)_cast\b)', line)
+ if match and match.group(1) != '*':
+ # Try a better error message when the & is bound to something
+ # dereferenced by the casted pointer, as opposed to the casted
+ # pointer itself.
+ parenthesis_error = False
+ match = Match(r'^(.*&(?:static|dynamic|down|reinterpret)_cast\b)<', line)
+ if match:
+ _, y1, x1 = CloseExpression(clean_lines, linenum, len(match.group(1)))
+ if x1 >= 0 and clean_lines.elided[y1][x1] == '(':
+ _, y2, x2 = CloseExpression(clean_lines, y1, x1)
+ if x2 >= 0:
+ extended_line = clean_lines.elided[y2][x2:]
+ if y2 < clean_lines.NumLines() - 1:
+ extended_line += clean_lines.elided[y2 + 1]
+ if Match(r'\s*(?:->|\[)', extended_line):
+ parenthesis_error = True
+
+ if parenthesis_error:
+ error(filename, linenum, 'readability/casting', 4,
+ ('Are you taking an address of something dereferenced '
+ 'from a cast? Wrapping the dereferenced expression in '
+ 'parentheses will make the binding more obvious'))
+ else:
+ 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'))
def CheckCStyleCast(filename, linenum, line, raw_line, cast_type, pattern,
@@ -4154,9 +4908,10 @@
if not match:
return False
- # Exclude lines with sizeof, since sizeof looks like a cast.
- sizeof_match = Match(r'.*sizeof\s*$', line[0:match.start(1) - 1])
- if sizeof_match:
+ # Exclude lines with keywords that tend to look like casts, and also
+ # macros which are generally troublesome.
+ if Match(r'.*\b(?:sizeof|alignof|alignas|[A-Z_]+)\s*$',
+ line[0:match.start(1) - 1]):
return False
# operator++(int) and operator--(int)
@@ -4188,7 +4943,8 @@
# <TemplateArgument(int)>;
# <(FunctionPointerTemplateArgument)(int)>;
remainder = line[match.end(0):]
- if Match(r'^\s*(?:;|const\b|throw\b|=|>|\{|\))', remainder):
+ if Match(r'^\s*(?:;|const\b|throw\b|final\b|override\b|=|>|\{|\))',
+ remainder):
# Looks like an unnamed parameter.
# Don't warn on any kind of template arguments.
@@ -4226,6 +4982,28 @@
return True
+def ExpectingFunctionArgs(clean_lines, linenum):
+ """Checks whether where function type arguments are expected.
+
+ Args:
+ clean_lines: A CleansedLines instance containing the file.
+ linenum: The number of the line to check.
+
+ Returns:
+ True if the line at 'linenum' is inside something that expects arguments
+ of function types.
+ """
+ line = clean_lines.elided[linenum]
+ return (Match(r'^\s*MOCK_(CONST_)?METHOD\d+(_T)?\(', line) or
+ (linenum >= 2 and
+ (Match(r'^\s*MOCK_(?:CONST_)?METHOD\d+(?:_T)?\((?:\S+,)?\s*$',
+ clean_lines.elided[linenum - 1]) or
+ Match(r'^\s*MOCK_(?:CONST_)?METHOD\d+(?:_T)?\(\s*$',
+ clean_lines.elided[linenum - 2]) or
+ Search(r'\bstd::m?function\s*\<\s*$',
+ clean_lines.elided[linenum - 1]))))
+
+
_HEADERS_CONTAINING_TEMPLATES = (
('<deque>', ('deque',)),
('<functional>', ('unary_function', 'binary_function',
@@ -4467,7 +5245,7 @@
def CheckMakePairUsesDeduction(filename, clean_lines, linenum, error):
"""Check that make_pair's template arguments are deduced.
- G++ 4.6 in C++0x mode fails badly if make_pair's template arguments are
+ G++ 4.6 in C++11 mode fails badly if make_pair's template arguments are
specified explicitly, and such use isn't intended in any case.
Args:
@@ -4483,6 +5261,31 @@
4, # 4 = high confidence
'For C++11-compatibility, omit template arguments from make_pair'
' OR use pair directly OR if appropriate, construct a pair directly')
+def CheckDefaultLambdaCaptures(filename, clean_lines, linenum, error):
+ """Check that default lambda captures are not used.
+
+ 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]
+
+ # A lambda introducer specifies a default capture if it starts with "[="
+ # or if it starts with "[&" _not_ followed by an identifier.
+ match = Match(r'^(.*)\[\s*(?:=|&[^\w])', line)
+ if match:
+ # Found a potential error, check what comes after the lambda-introducer.
+ # If it's not open parenthesis (for lambda-declarator) or open brace
+ # (for compound-statement), it's not a lambda.
+ line, _, pos = CloseExpression(clean_lines, linenum, len(match.group(1)))
+ if pos >= 0 and Match(r'^\s*[{(]', line[pos:]):
+ error(filename, linenum, 'build/c++11',
+ 4, # 4 = high confidence
+ 'Default lambda captures are an unapproved C++ feature.')
+
+
def ProcessLine(filename, file_extension, clean_lines, line,
@@ -4498,7 +5301,7 @@
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.
- nesting_state: A _NestingState instance which maintains information about
+ 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
@@ -4509,8 +5312,7 @@
raw_lines = clean_lines.raw_lines
ParseNolintSuppressions(filename, raw_lines[line], line, error)
nesting_state.Update(filename, clean_lines, line, error)
- if nesting_state.stack and nesting_state.stack[-1].inline_asm != _NO_ASM:
- return
+ if nesting_state.InAsmBlock(): return
CheckForFunctionLengths(filename, clean_lines, line, function_state, error)
CheckForMultilineCommentsAndStrings(filename, clean_lines, line, error)
CheckStyle(filename, clean_lines, line, file_extension, nesting_state, error)
@@ -4523,8 +5325,58 @@
CheckPosixThreading(filename, clean_lines, line, error)
CheckInvalidIncrement(filename, clean_lines, line, error)
CheckMakePairUsesDeduction(filename, clean_lines, line, error)
+ CheckDefaultLambdaCaptures(filename, clean_lines, line, error)
for check_fn in extra_check_functions:
check_fn(filename, clean_lines, line, error)
+
+def FlagCxx11Features(filename, clean_lines, linenum, error):
+ """Flag those c++11 features that we only allow in certain places.
+
+ 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]
+
+ # Flag unapproved C++11 headers.
+ include = Match(r'\s*#\s*include\s+[<"]([^<"]+)[">]', line)
+ if include and include.group(1) in ('cfenv',
+ 'condition_variable',
+ 'fenv.h',
+ 'future',
+ 'mutex',
+ 'thread',
+ 'chrono',
+ 'ratio',
+ 'regex',
+ 'system_error',
+ ):
+ error(filename, linenum, 'build/c++11', 5,
+ ('<%s> is an unapproved C++11 header.') % include.group(1))
+
+ # The only place where we need to worry about C++11 keywords and library
+ # features in preprocessor directives is in macro definitions.
+ if Match(r'\s*#', line) and not Match(r'\s*#\s*define\b', line): return
+
+ # These are classes and free functions. The classes are always
+ # mentioned as std::*, but we only catch the free functions if
+ # they're not found by ADL. They're alphabetical by header.
+ for top_name in (
+ # type_traits
+ 'alignment_of',
+ 'aligned_union',
+
+ # utility
+ 'forward',
+ ):
+ if Search(r'\bstd::%s\b' % top_name, line):
+ error(filename, linenum, 'build/c++11', 5,
+ ('std::%s is an unapproved C++11 class or function. Send c-style '
+ 'an example of where it would make your code more readable, and '
+ 'they may let you use it.') % top_name)
+
def ProcessFileData(filename, file_extension, lines, error,
extra_check_functions=[]):
@@ -4546,7 +5398,7 @@
include_state = _IncludeState()
function_state = _FunctionState()
- nesting_state = _NestingState()
+ nesting_state = NestingState()
ResetNolintSuppressions()
@@ -4561,6 +5413,7 @@
ProcessLine(filename, file_extension, clean_lines, line,
include_state, function_state, nesting_state, error,
extra_check_functions)
+ FlagCxx11Features(filename, clean_lines, line, error)
nesting_state.CheckCompletedBlocks(filename, error)
CheckForIncludeWhatYouUse(filename, clean_lines, include_state, error)
@@ -4571,6 +5424,7 @@
CheckForNewlineAtEOF(filename, lines, error)
+
def ProcessFile(filename, vlevel, extra_check_functions=[]):
"""Does google-lint on a single file.
@@ -4587,6 +5441,8 @@
_SetVerboseLevel(vlevel)
+ lf_lines = []
+ crlf_lines = []
try:
# Support the UNIX convention of using "-" for stdin. Note that
# we are not opening the file with universal newline support
@@ -4594,10 +5450,7 @@
# 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.
-
+ # below.
if filename == '-':
lines = codecs.StreamReaderWriter(sys.stdin,
codecs.getreader('utf8'),
@@ -4606,12 +5459,14 @@
else:
lines = codecs.open(filename, 'r', 'utf8', 'replace').read().split('\n')
- carriage_return_found = False
# Remove trailing '\r'.
- for linenum in range(len(lines)):
+ # The -1 accounts for the extra trailing blank line we get from split()
+ for linenum in range(len(lines) - 1):
if lines[linenum].endswith('\r'):
lines[linenum] = lines[linenum].rstrip('\r')
- carriage_return_found = True
+ crlf_lines.append(linenum + 1)
+ else:
+ lf_lines.append(linenum + 1)
except IOError:
sys.stderr.write(
@@ -4629,12 +5484,24 @@
else:
ProcessFileData(filename, file_extension, lines, Error,
extra_check_functions)
- if carriage_return_found and os.linesep != '\r\n':
- # Use 0 for linenum since outputting 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')
+
+ # If end-of-line sequences are a mix of LF and CR-LF, issue
+ # warnings on the lines with CR.
+ #
+ # Don't issue any warnings if all lines are uniformly LF or CR-LF,
+ # since critique can handle these just fine, and the style guide
+ # doesn't dictate a particular end of line sequence.
+ #
+ # We can't depend on os.linesep to determine what the desired
+ # end-of-line sequence should be, since that will return the
+ # server-side end-of-line sequence.
+ if lf_lines and crlf_lines:
+ # Warn on every line with CR. An alternative approach might be to
+ # check whether the file is mostly CRLF or just LF, and warn on the
+ # minority, we bias toward LF here since most tools prefer LF.
+ for linenum in crlf_lines:
+ Error(filename, linenum, 'whitespace/newline', 1,
+ 'Unexpected \\r (^M) found; better to use only \\n')
sys.stderr.write('Done processing %s\n' % filename)
