Introduce new check_GNU_style.py script.

2017-05-19  Martin Liska  <mliska@suse.cz>

	* check_GNU_style.py: New file.

From-SVN: r248281

contrib/ChangeLog

+2017-05-19  Martin Liska  <mliska@suse.cz>
+
+	* check_GNU_style.py: New file.
+
 2007-05-03  Jeff Law  <law@redhat.com>
 
 	* config-list.mk (am33_2.0-linux): Remove from list of targets

contrib/check_GNU_style.py

+#!/usr/bin/env python3
+#
+# Checks some of the GNU style formatting rules in a set of patches.
+# The script is a rewritten of the same bash script and should eventually
+# replace the former script.
+#
+# This file is part of GCC.
+#
+# GCC is free software; you can redistribute it and/or modify it under
+# the terms of the GNU General Public License as published by the Free
+# Software Foundation; either version 3, or (at your option) any later
+# version.
+#
+# GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+# WARRANTY; without even the implied warranty of MERCHANTABILITY or
+# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+# for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GCC; see the file COPYING3.  If not see
+# <http://www.gnu.org/licenses/>.  */
+#
+# The script requires python packages, which can be installed via pip3
+# like this:
+# $ pip3 install unidiff termcolor 
+
+import sys
+import re
+import argparse
+import unittest
+
+try:
+    from termcolor import colored
+except ImportError:
+    print('termcolor module is missing (run: pip3 install termcolor)')
+    exit(3)
+
+try:
+    from unidiff import PatchSet
+except ImportError:
+    print('unidiff module is missing (run: pip3 install unidiff)')
+    exit(3)
+
+from itertools import *
+
+ws_char = '█'
+ts = 8
+
+def error_string(s):
+    return colored(s, 'red', attrs = ['bold'])
+
+class CheckError:
+    def __init__(self, filename, lineno, console_error, error_message,
+        column = -1):
+        self.filename = filename
+        self.lineno = lineno
+        self.console_error = console_error
+        self.error_message = error_message
+        self.column = column
+
+    def error_location(self):
+        return '%s:%d:%d:' % (self.filename, self.lineno,
+            self.column if self.column != -1 else -1)
+
+class LineLengthCheck:
+    def __init__(self):
+        self.limit = 80
+        self.expanded_tab = ' ' * ts
+
+    def check(self, filename, lineno, line):
+        line_expanded = line.replace('\t', self.expanded_tab)
+        if len(line_expanded) > self.limit:
+            return CheckError(filename, lineno,
+                line_expanded[:self.limit]
+                    + error_string(line_expanded[self.limit:]),
+                'lines should not exceed 80 characters', self.limit)
+
+        return None
+
+class SpacesCheck:
+    def __init__(self):
+        self.expanded_tab = ' ' * ts
+
+    def check(self, filename, lineno, line):
+        i = line.find(self.expanded_tab)
+        if i != -1:
+            return CheckError(filename, lineno,
+                line.replace(self.expanded_tab, error_string(ws_char * ts)),
+                'blocks of 8 spaces should be replaced with tabs', i)
+
+class TrailingWhitespaceCheck:
+    def __init__(self):
+        self.re = re.compile('(\s+)$')
+
+    def check(self, filename, lineno, line):
+        m = self.re.search(line)
+        if m != None:
+            return CheckError(filename, lineno,
+                line[:m.start(1)] + error_string(ws_char * len(m.group(1)))
+                + line[m.end(1):],
+                'trailing whitespace', m.start(1))
+
+class SentenceSeparatorCheck:
+    def __init__(self):
+        self.re = re.compile('\w\.(\s|\s{3,})\w')
+
+    def check(self, filename, lineno, line):
+        m = self.re.search(line)
+        if m != None:
+            return CheckError(filename, lineno,
+                line[:m.start(1)] + error_string(ws_char * len(m.group(1)))
+                + line[m.end(1):],
+                'dot, space, space, new sentence', m.start(1))
+
+class SentenceEndOfCommentCheck:
+    def __init__(self):
+        self.re = re.compile('\w\.(\s{0,1}|\s{3,})\*/')
+
+    def check(self, filename, lineno, line):
+        m = self.re.search(line)
+        if m != None:
+            return CheckError(filename, lineno,
+                line[:m.start(1)] + error_string(ws_char * len(m.group(1)))
+                + line[m.end(1):],
+                'dot, space, space, end of comment', m.start(1))
+
+class SentenceDotEndCheck:
+    def __init__(self):
+        self.re = re.compile('\w(\s*\*/)')
+
+    def check(self, filename, lineno, line):
+        m = self.re.search(line)
+        if m != None:
+            return CheckError(filename, lineno,
+                line[:m.start(1)] + error_string(m.group(1)) + line[m.end(1):],
+                'dot, space, space, end of comment', m.start(1))
+
+class FunctionParenthesisCheck:
+    # TODO: filter out GTY stuff
+    def __init__(self):
+        self.re = re.compile('\w(\s{2,})?(\()')
+
+    def check(self, filename, lineno, line):
+        if '#define' in line:
+            return None
+
+        m = self.re.search(line)
+        if m != None:
+            return CheckError(filename, lineno,
+                line[:m.start(2)] + error_string(m.group(2)) + line[m.end(2):],
+                'there should be exactly one space between function name ' \
+                'and parenthesis', m.start(2))
+
+class SquareBracketCheck:
+    def __init__(self):
+        self.re = re.compile('\w\s+(\[)')
+
+    def check(self, filename, lineno, line):
+        m = self.re.search(line)
+        if m != None:
+            return CheckError(filename, lineno,
+                line[:m.start(1)] + error_string(m.group(1)) + line[m.end(1):],
+                'there should be no space before a left square bracket',
+                m.start(1))
+
+class ClosingParenthesisCheck:
+    def __init__(self):
+        self.re = re.compile('\S\s+(\))')
+
+    def check(self, filename, lineno, line):
+        m = self.re.search(line)
+        if m != None:
+            return CheckError(filename, lineno,
+                line[:m.start(1)] + error_string(m.group(1)) + line[m.end(1):],
+                'there should be no space before closing parenthesis',
+                m.start(1))
+
+class BracesOnSeparateLineCheck:
+    # This will give false positives for C99 compound literals.
+
+    def __init__(self):
+        self.re = re.compile('(\)|else)\s*({)')
+
+    def check(self, filename, lineno, line):
+        m = self.re.search(line)
+        if m != None:
+            return CheckError(filename, lineno,
+                line[:m.start(2)] + error_string(m.group(2)) + line[m.end(2):],
+                'braces should be on a separate line', m.start(2))
+
+class TrailinigOperatorCheck:
+    def __init__(self):
+        regex = '^\s.*(([^a-zA-Z_]\*)|([-%<=&|^?])|([^*]/)|([^:][+]))$'
+        self.re = re.compile(regex)
+
+    def check(self, filename, lineno, line):
+        m = self.re.search(line)
+        if m != None:
+            return CheckError(filename, lineno,
+                line[:m.start(1)] + error_string(m.group(1)) + line[m.end(1):],
+                'trailing operator', m.start(1))
+
+class LineLengthTest(unittest.TestCase):
+    def setUp(self):
+        self.check = LineLengthCheck()
+
+    def test_line_length_check_basic(self):
+        r = self.check.check('foo', 123, self.check.limit * 'a' + ' = 123;')
+        self.assertIsNotNone(r)
+        self.assertEqual('foo', r.filename)
+        self.assertEqual(80, r.column)
+        self.assertEqual(r.console_error,
+            self.check.limit * 'a' + error_string(' = 123;'))
+
+def main():
+    parser = argparse.ArgumentParser(description='Check GNU coding style.')
+    parser.add_argument('file', help = 'File with a patch')
+    parser.add_argument('-f', '--format', default = 'stdio',
+        help = 'Display format',
+        choices = ['stdio', 'quickfix'])
+    args = parser.parse_args()
+
+    checks = [LineLengthCheck(), SpacesCheck(), TrailingWhitespaceCheck(),
+        SentenceSeparatorCheck(), SentenceEndOfCommentCheck(),
+        SentenceDotEndCheck(), FunctionParenthesisCheck(),
+        SquareBracketCheck(), ClosingParenthesisCheck(),
+        BracesOnSeparateLineCheck(), TrailinigOperatorCheck()]
+    errors = []
+
+    with open(args.file, 'rb') as diff_file:
+        patch = PatchSet(diff_file, encoding = 'utf-8')
+
+    for pfile in patch.added_files + patch.modified_files:
+        t = pfile.target_file.lstrip('b/')
+        # Skip testsuite files
+        if 'testsuite' in t:
+            continue
+
+        for hunk in pfile:
+            delta = 0
+            for line in hunk:
+                if line.is_added and line.target_line_no != None:
+                    for check in checks:
+                        e = check.check(t, line.target_line_no, line.value)
+                        if e != None:
+                            errors.append(e)
+
+    if args.format == 'stdio':
+        fn = lambda x: x.error_message
+        i = 1
+        for (k, errors) in groupby(sorted(errors, key = fn), fn):
+            errors = list(errors)
+            print('=== ERROR type #%d: %s (%d error(s)) ==='
+                % (i, k, len(errors)))
+            i += 1
+            for e in errors:
+                print(e.error_location () + e.console_error)
+            print()
+
+        exit(0 if len(errors) == 0 else 1)
+    elif args.format == 'quickfix':
+        f = 'errors.err'
+        with open(f, 'w+') as qf:
+            for e in errors:
+                qf.write('%s%s\n' % (e.error_location(), e.error_message))
+        if len(errors) == 0:
+            exit(0)
+        else:
+            print('%d error(s) written to %s file.' % (len(errors), f))
+            exit(1)
+    else:
+        assert False
+
+if __name__ == '__main__':
+    if len(sys.argv) > 1:
+        main()
+    else:
+        unittest.main()