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#!/usr/bin/env python
#
# Copyright (C) 2009 Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Script to run the linter for source code of WebKit."""
import codecs
import os
import os.path
import sys
import modules.cpp_style as cpp_style
from modules.diff_parser import DiffParser
from modules.scm import detect_scm_system
# Override the usage of the lint tool.
cpp_style._USAGE = """
Syntax: %(program_name)s [--verbose=#] [--git-commit=<SingleCommit>] [--output=vs7]
[--filter=-x,+y,...] [file] ...
The style guidelines this tries to follow are those in
http://webkit.org/coding/coding-style.html
Every problem is given a confidence score from 1-5, with 5 meaning we are
certain of the problem, and 1 meaning it could be a legitimate construct.
This will miss some errors, and is not a substitute for a code review.
To prevent specific lines from being linted, add a '// NOLINT' comment to the
end of the line.
Linted extensions are .cpp, .c and .h. Other file types will be ignored.
The file parameter is optional and multiple files to scan be passed in.
Leaving out the file parameter will apply the check to the files changed
according to the scm system.
Flags:
verbose=#
Specify a number 0-5 to restrict errors to certain verbosity levels.
git-commit=<SingleCommit>
Checks the style of everything from the given commit to the local tree.
output=vs7
By default, the output is formatted to ease emacs parsing. Visual Studio
compatible output (vs7) may also be used. Other formats are unsupported.
filter=-x,+y,...
Specify a comma-separated list of category-filters to apply: only
error messages whose category names pass the filters will be printed.
(Category names are printed with the message and look like
"[whitespace/indent]".) Filters are evaluated left to right.
"-FOO" and "FOO" means "do not print categories that start with FOO".
"+FOO" means "do print categories that start with FOO".
Examples: --filter=-whitespace,+whitespace/braces
--filter=whitespace,runtime/printf,+runtime/printf_format
--filter=-,+build/include_what_you_use
To see a list of all the categories used in %(program_name)s, pass no arg:
--filter=
""" % {'program_name': os.path.basename(sys.argv[0])}
def process_patch(patch_string):
"""Does lint on a single patch.
Args:
patch_string: A string of a patch.
"""
patch = DiffParser(patch_string.splitlines())
for filename, diff in patch.files.iteritems():
file_extension = os.path.splitext(filename)[1]
if file_extension in ['.cpp', '.c', '.h']:
line_numbers = set()
def error_for_patch(filename, line_number, category, confidence, message):
"""Wrapper function of cpp_style.error for patches.
This function outputs errors only if the line number
corresponds to lines which are modified or added.
"""
if not line_numbers:
for line in diff.lines:
# When deleted line is not set, it means that
# the line is newly added.
if not line[0]:
line_numbers.add(line[1])
if line_number in line_numbers:
cpp_style.error(filename, line_number, category, confidence, message)
cpp_style.process_file(filename, error=error_for_patch)
def main():
cpp_style.use_webkit_styles()
(files, flags) = cpp_style.parse_arguments(sys.argv[1:], ["git-commit="])
# Change stderr to write with replacement characters so we don't die
# if we try to print something containing non-ASCII characters.
sys.stderr = codecs.StreamReaderWriter(sys.stderr,
codecs.getreader('utf8'),
codecs.getwriter('utf8'),
'replace')
if files and "--git-commit" in flags:
sys.stderr.write("ERROR: It is not possible to check files "
"and a specific commit at the same time.\n" + cpp_style._USAGE)
sys.exit(1)
if files:
for filename in files:
cpp_style.process_file(filename)
else:
cwd = os.path.abspath('.')
scm = detect_scm_system(cwd)
if "--git-commit" in flags:
commit = flags["--git-commit"]
if '..' in commit:
# FIXME: If the range is a "...", the code should find the common ancestor and
# start there (see git diff --help for information about how ... usually works).
commit = commit[:commit.find('..')]
print >> sys.stderr, "Warning: Ranges are not supported for --git-commit. Checking all changes since %s.\n" % commit
process_patch(scm.create_patch_since_local_commit(commit))
else:
process_patch(scm.create_patch())
sys.stderr.write('Total errors found: %d\n' % cpp_style.error_count())
sys.exit(cpp_style.error_count() > 0)
if __name__ == "__main__":
main()
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