Revert "Revert "pylint: upgrade to 1.3.1""

third_party/pylint/testutils.py

Index: third_party/pylint/testutils.py
===================================================================
--- third_party/pylint/testutils.py	(revision 0)
+++ third_party/pylint/testutils.py	(working copy)
@@ -0,0 +1,386 @@
+# Copyright (c) 2003-2013 LOGILAB S.A. (Paris, FRANCE).
+# http://www.logilab.fr/ -- mailto:contact@logilab.fr
+#
+# This program 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 2 of the License, or (at your option) any later
+# version.
+#
+# This program 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
+# this program; if not, write to the Free Software Foundation, Inc.,
+# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+"""functional/non regression tests for pylint"""
+from __future__ import with_statement
+
+import collections
+import contextlib
+import functools
+import sys
+import re
+
+from glob import glob
+from os import linesep
+from os.path import abspath, basename, dirname, isdir, join, splitext
+from cStringIO import StringIO
+
+from logilab.common import testlib
+
+from pylint import checkers
+from pylint.utils import PyLintASTWalker
+from pylint.reporters import BaseReporter
+from pylint.interfaces import IReporter
+from pylint.lint import PyLinter
+
+
+# Utils
+
+SYS_VERS_STR = '%d%d%d' % sys.version_info[:3]
+TITLE_UNDERLINES = ['', '=', '-', '.']
+PREFIX = abspath(dirname(__file__))
+PY3K = sys.version_info[0] == 3
+
+def fix_path():
+    sys.path.insert(0, PREFIX)
+
+def get_tests_info(input_dir, msg_dir, prefix, suffix):
+    """get python input examples and output messages
+
+    We use following conventions for input files and messages:
+    for different inputs:
+        test for python  >= x.y    ->  input   =  <name>_pyxy.py
+        test for python  <  x.y    ->  input   =  <name>_py_xy.py
+    for one input and different messages:
+        message for python >=  x.y ->  message =  <name>_pyxy.txt
+        lower versions             ->  message with highest num
+    """
+    result = []
+    for fname in glob(join(input_dir, prefix + '*' + suffix)):
+        infile = basename(fname)
+        fbase = splitext(infile)[0]
+        # filter input files :
+        pyrestr = fbase.rsplit('_py', 1)[-1] # like _26 or 26
+        if pyrestr.isdigit(): # '24', '25'...
+            if SYS_VERS_STR < pyrestr:
+                continue
+        if pyrestr.startswith('_') and  pyrestr[1:].isdigit():
+            # skip test for higher python versions
+            if SYS_VERS_STR >= pyrestr[1:]:
+                continue
+        messages = glob(join(msg_dir, fbase + '*.txt'))
+        # the last one will be without ext, i.e. for all or upper versions:
+        if messages:
+            for outfile in sorted(messages, reverse=True):
+                py_rest = outfile.rsplit('_py', 1)[-1][:-4]
+                if py_rest.isdigit() and SYS_VERS_STR >= py_rest:
+                    break
+        else:
+            # This will provide an error message indicating the missing filename.
+            outfile = join(msg_dir, fbase + '.txt')
+        result.append((infile, outfile))
+    return result
+
+
+class TestReporter(BaseReporter):
+    """reporter storing plain text messages"""
+
+    __implements____ = IReporter
+
+    def __init__(self):
+        self.message_ids = {}
+        self.reset()
+
+    def reset(self):
+        self.out = StringIO()
+        self.messages = []
+
+    def add_message(self, msg_id, location, msg):
+        """manage message of different type and in the context of path """
+        _, _, obj, line, _ = location
+        self.message_ids[msg_id] = 1
+        if obj:
+            obj = ':%s' % obj
+        sigle = msg_id[0]
+        if PY3K and linesep != '\n':
+            # 2to3 writes os.linesep instead of using
+            # the previosly used line separators
+            msg = msg.replace('\r\n', '\n')
+        self.messages.append('%s:%3s%s: %s' % (sigle, line, obj, msg))
+
+    def finalize(self):
+        self.messages.sort()
+        for msg in self.messages:
+            print >> self.out, msg
+        result = self.out.getvalue()
+        self.reset()
+        return result
+
+    def display_results(self, layout):
+        """ignore layouts"""
+
+
+if sys.version_info < (2, 6):
+    class Message(tuple):
+        def __new__(cls, msg_id, line=None, node=None, args=None):
+            return tuple.__new__(cls, (msg_id, line, node, args))
+
+        @property
+        def msg_id(self):
+            return self[0]
+        @property
+        def line(self):
+            return self[1]
+        @property
+        def node(self):
+            return self[2]
+        @property
+        def args(self):
+            return self[3]
+
+
+else:
+    class Message(collections.namedtuple('Message',
+                                         ['msg_id', 'line', 'node', 'args'])):
+        def __new__(cls, msg_id, line=None, node=None, args=None):
+            return tuple.__new__(cls, (msg_id, line, node, args))
+
+
+class UnittestLinter(object):
+    """A fake linter class to capture checker messages."""
+
+    def __init__(self):
+        self._messages = []
+        self.stats = {}
+
+    def release_messages(self):
+        try:
+            return self._messages
+        finally:
+            self._messages = []
+
+    def add_message(self, msg_id, line=None, node=None, args=None):
+        self._messages.append(Message(msg_id, line, node, args))
+
+    def is_message_enabled(self, *unused_args):
+        return True
+
+    def add_stats(self, **kwargs):
+        for name, value in kwargs.iteritems():
+            self.stats[name] = value
+        return self.stats
+
+    @property
+    def options_providers(self):
+        return linter.options_providers
+
+def set_config(**kwargs):
+    """Decorator for setting config values on a checker."""
+    def _Wrapper(fun):
+        @functools.wraps(fun)
+        def _Forward(self):
+            for key, value in kwargs.iteritems():
+                setattr(self.checker.config, key, value)
+            if isinstance(self, CheckerTestCase):
+                # reopen checker in case, it may be interested in configuration change
+                self.checker.open()
+            fun(self)
+
+        return _Forward
+    return _Wrapper
+
+
+class CheckerTestCase(testlib.TestCase):
+    """A base testcase class for unittesting individual checker classes."""
+    CHECKER_CLASS = None
+    CONFIG = {}
+
+    def setUp(self):
+        self.linter = UnittestLinter()
+        self.checker = self.CHECKER_CLASS(self.linter) # pylint: disable=not-callable
+        for key, value in self.CONFIG.iteritems():
+            setattr(self.checker.config, key, value)
+        self.checker.open()
+
+    @contextlib.contextmanager
+    def assertNoMessages(self):
+        """Assert that no messages are added by the given method."""
+        with self.assertAddsMessages():
+            yield
+
+    @contextlib.contextmanager
+    def assertAddsMessages(self, *messages):
+        """Assert that exactly the given method adds the given messages.
+
+        The list of messages must exactly match *all* the messages added by the
+        method. Additionally, we check to see whether the args in each message can
+        actually be substituted into the message string.
+        """
+        yield
+        got = self.linter.release_messages()
+        msg = ('Expected messages did not match actual.\n'
+               'Expected:\n%s\nGot:\n%s' % ('\n'.join(repr(m) for m in messages),
+                                            '\n'.join(repr(m) for m in got)))
+        self.assertEqual(list(messages), got, msg)
+
+    def walk(self, node):
+        """recursive walk on the given node"""
+        walker = PyLintASTWalker(linter)
+        walker.add_checker(self.checker)
+        walker.walk(node)
+
+
+# Init
+test_reporter = TestReporter()
+linter = PyLinter()
+linter.set_reporter(test_reporter)
+linter.config.persistent = 0
+checkers.initialize(linter)
+linter.global_set_option('required-attributes', ('__revision__',))
+
+if linesep != '\n':
+    LINE_RGX = re.compile(linesep)
+    def ulines(string):
+        return LINE_RGX.sub('\n', string)
+else:
+    def ulines(string):
+        return string
+
+INFO_TEST_RGX = re.compile(r'^func_i\d\d\d\d$')
+
+def exception_str(self, ex):
+    """function used to replace default __str__ method of exception instances"""
+    return 'in %s\n:: %s' % (ex.file, ', '.join(ex.args))
+
+# Test classes
+
+class LintTestUsingModule(testlib.TestCase):
+    INPUT_DIR = None
+    DEFAULT_PACKAGE = 'input'
+    package = DEFAULT_PACKAGE
+    linter = linter
+    module = None
+    depends = None
+    output = None
+    _TEST_TYPE = 'module'
+
+    def shortDescription(self):
+        values = {'mode' : self._TEST_TYPE,
+                  'input': self.module,
+                  'pkg':   self.package,
+                  'cls':   self.__class__.__name__}
+
+        if self.package == self.DEFAULT_PACKAGE:
+            msg = '%(mode)s test of input file "%(input)s" (%(cls)s)'
+        else:
+            msg = '%(mode)s test of input file "%(input)s" in "%(pkg)s" (%(cls)s)'
+        return msg % values
+
+    def test_functionality(self):
+        tocheck = [self.package+'.'+self.module]
+        if self.depends:
+            tocheck += [self.package+'.%s' % name.replace('.py', '')
+                        for name, _ in self.depends]
+        self._test(tocheck)
+
+    def _check_result(self, got):
+        self.assertMultiLineEqual(self._get_expected().strip()+'\n',
+                                  got.strip()+'\n')
+
+    def _test(self, tocheck):
+        if INFO_TEST_RGX.match(self.module):
+            self.linter.enable('I')
+        else:
+            self.linter.disable('I')
+        try:
+            self.linter.check(tocheck)
+        except Exception, ex:
+            # need finalization to restore a correct state
+            self.linter.reporter.finalize()
+            ex.file = tocheck
+            print ex
+            ex.__str__ = exception_str
+            raise
+        self._check_result(self.linter.reporter.finalize())
+
+    def _has_output(self):
+        return not self.module.startswith('func_noerror_')
+
+    def _get_expected(self):
+        if self._has_output() and self.output:
+            with open(self.output, 'U') as fobj:
+                return fobj.read().strip() + '\n'
+        else:
+            return ''
+
+class LintTestUsingFile(LintTestUsingModule):
+
+    _TEST_TYPE = 'file'
+
+    def test_functionality(self):
+        importable = join(self.INPUT_DIR, self.module)
+        # python also prefers packages over simple modules.
+        if not isdir(importable):
+            importable += '.py'
+        tocheck = [importable]
+        if self.depends:
+            tocheck += [join(self.INPUT_DIR, name) for name, _file in self.depends]
+        self._test(tocheck)
+
+class LintTestUpdate(LintTestUsingModule):
+
+    _TEST_TYPE = 'update'
+
+    def _check_result(self, got):
+        if self._has_output():
+            try:
+                expected = self._get_expected()
+            except IOError:
+                expected = ''
+            if got != expected:
+                with open(self.output, 'w') as fobj:
+                    fobj.write(got)
+
+# Callback
+
+def cb_test_gen(base_class):
+    def call(input_dir, msg_dir, module_file, messages_file, dependencies):
+        class LintTC(base_class):
+            module = module_file.replace('.py', '')
+            output = messages_file
+            depends = dependencies or None
+            tags = testlib.Tags(('generated', 'pylint_input_%s' % module))
+            INPUT_DIR = input_dir
+            MSG_DIR = msg_dir
+        return LintTC
+    return call
+
+# Main function
+
+def make_tests(input_dir, msg_dir, filter_rgx, callbacks):
+    """generate tests classes from test info
+
+    return the list of generated test classes
+    """
+    if filter_rgx:
+        is_to_run = re.compile(filter_rgx).search
+    else:
+        is_to_run = lambda x: 1
+    tests = []
+    for module_file, messages_file in (
+            get_tests_info(input_dir, msg_dir, 'func_', '')
+    ):
+        if not is_to_run(module_file):
+            continue
+        base = module_file.replace('func_', '').replace('.py', '')
+
+        dependencies = get_tests_info(input_dir, msg_dir, base, '.py')
+
+        for callback in callbacks:
+            test = callback(input_dir, msg_dir, module_file, messages_file,
+                            dependencies)
+            if test:
+                tests.append(test)
+    return tests