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# Copyright (c) 2003-2014 LOGILAB S.A. (Paris, FRANCE).
# --
# 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.
"""some various utilities and helper classes, most of them used in the
main pylint class
from __future__ import print_function
import collections
import os
import re
import sys
import tokenize
import warnings
from os.path import dirname, basename, splitext, exists, isdir, join, normpath
import six
from six.moves import zip # pylint: disable=redefined-builtin
from logilab.common.interface import implements
from logilab.common.textutils import normalize_text
from logilab.common.configuration import rest_format_section
from logilab.common.ureports import Section
from astroid import nodes, Module
from astroid.modutils import modpath_from_file, get_module_files, \
file_from_modpath, load_module_from_file
from pylint.interfaces import IRawChecker, ITokenChecker, UNDEFINED
class UnknownMessage(Exception):
"""raised when a unregistered message id is encountered"""
class EmptyReport(Exception):
"""raised when a report is empty and so should not be displayed"""
'I' : 'info',
'C' : 'convention',
'R' : 'refactor',
'W' : 'warning',
'E' : 'error',
'F' : 'fatal'
MSG_TYPES_LONG = {v: k for k, v in six.iteritems(MSG_TYPES)}
'I' : 0,
'C' : 16,
'R' : 8,
'W' : 4,
'E' : 2,
'F' : 1
OPTION_RGX = re.compile(r'\s*#.*\bpylint:(.*)')
# The line/node distinction does not apply to fatal errors and reports.
class WarningScope(object):
LINE = 'line-based-msg'
NODE = 'node-based-msg'
_MsgBase = collections.namedtuple(
['msg_id', 'symbol', 'msg', 'C', 'category', 'confidence',
'abspath', 'path', 'module', 'obj', 'line', 'column'])
class Message(_MsgBase):
"""This class represent a message to be issued by the reporters"""
def __new__(cls, msg_id, symbol, location, msg, confidence):
return _MsgBase.__new__(
cls, msg_id, symbol, msg, msg_id[0], MSG_TYPES[msg_id[0]],
confidence, *location)
def format(self, template):
"""Format the message according to the given template.
The template format is the one of the format method :
# For some reason, _asdict on derived namedtuples does not work with
# Python 3.4. Needs some investigation.
return template.format(**dict(zip(self._fields, self)))
def get_module_and_frameid(node):
"""return the module name and the frame id in the module"""
frame = node.frame()
module, obj = '', []
while frame:
if isinstance(frame, Module):
module =
obj.append(getattr(frame, 'name', '<lambda>'))
frame = frame.parent.frame()
except AttributeError:
frame = None
return module, '.'.join(obj)
def category_id(cid):
cid = cid.upper()
if cid in MSG_TYPES:
return cid
return MSG_TYPES_LONG.get(cid)
def _decoding_readline(stream, module):
return lambda: stream.readline().decode(module.file_encoding,
def tokenize_module(module):
with as stream:
readline = stream.readline
if sys.version_info < (3, 0):
if module.file_encoding is not None:
readline = _decoding_readline(stream, module)
return list(tokenize.generate_tokens(readline))
return list(tokenize.tokenize(readline))
def build_message_def(checker, msgid, msg_tuple):
if implements(checker, (IRawChecker, ITokenChecker)):
default_scope = WarningScope.LINE
default_scope = WarningScope.NODE
options = {}
if len(msg_tuple) > 3:
(msg, symbol, descr, options) = msg_tuple
elif len(msg_tuple) > 2:
(msg, symbol, descr) = msg_tuple[:3]
# messages should have a symbol, but for backward compatibility
# they may not.
(msg, descr) = msg_tuple
warnings.warn("[pylint 0.26] description of message %s doesn't include "
"a symbolic name" % msgid, DeprecationWarning)
symbol = None
options.setdefault('scope', default_scope)
return MessageDefinition(checker, msgid, msg, descr, symbol, **options)
class MessageDefinition(object):
def __init__(self, checker, msgid, msg, descr, symbol, scope,
minversion=None, maxversion=None, old_names=None):
self.checker = checker
assert len(msgid) == 5, 'Invalid message id %s' % msgid
assert msgid[0] in MSG_TYPES, \
'Bad message type %s in %r' % (msgid[0], msgid)
self.msgid = msgid
self.msg = msg
self.descr = descr
self.symbol = symbol
self.scope = scope
self.minversion = minversion
self.maxversion = maxversion
self.old_names = old_names or []
def may_be_emitted(self):
"""return True if message may be emitted using the current interpreter"""
if self.minversion is not None and self.minversion > sys.version_info:
return False
if self.maxversion is not None and self.maxversion <= sys.version_info:
return False
return True
def format_help(self, checkerref=False):
"""return the help string for the given message id"""
desc = self.descr
if checkerref:
desc += ' This message belongs to the %s checker.' % \
title = self.msg
if self.symbol:
msgid = '%s (%s)' % (self.symbol, self.msgid)
msgid = self.msgid
if self.minversion or self.maxversion:
restr = []
if self.minversion:
restr.append('< %s' % '.'.join([str(n) for n in self.minversion]))
if self.maxversion:
restr.append('>= %s' % '.'.join([str(n) for n in self.maxversion]))
restr = ' or '.join(restr)
if checkerref:
desc += " It can't be emitted when using Python %s." % restr
desc += " This message can't be emitted when using Python %s." % restr
desc = normalize_text(' '.join(desc.split()), indent=' ')
if title != '%s':
title = title.splitlines()[0]
return ':%s: *%s*\n%s' % (msgid, title, desc)
return ':%s:\n%s' % (msgid, desc)
class MessagesHandlerMixIn(object):
"""a mix-in class containing all the messages related methods for the main
lint class
def __init__(self):
self._msgs_state = {}
self.msg_status = 0
def disable(self, msgid, scope='package', line=None, ignore_unknown=False):
"""don't output message of the given id"""
assert scope in ('package', 'module')
# handle disable=all by disabling all categories
if msgid == 'all':
for msgid in MSG_TYPES:
self.disable(msgid, scope, line)
# msgid is a category?
catid = category_id(msgid)
if catid is not None:
for _msgid in self.msgs_store._msgs_by_category.get(catid):
self.disable(_msgid, scope, line)
# msgid is a checker name?
if msgid.lower() in self._checkers:
msgs_store = self.msgs_store
for checker in self._checkers[msgid.lower()]:
for _msgid in checker.msgs:
if _msgid in msgs_store._alternative_names:
self.disable(_msgid, scope, line)
# msgid is report id?
if msgid.lower().startswith('rp'):
# msgid is a symbolic or numeric msgid.
msg = self.msgs_store.check_message_id(msgid)
except UnknownMessage:
if ignore_unknown:
if scope == 'module':
self.file_state.set_msg_status(msg, line, False)
if msg.symbol != 'locally-disabled':
self.add_message('locally-disabled', line=line,
args=(msg.symbol, msg.msgid))
msgs = self._msgs_state
msgs[msg.msgid] = False
# sync configuration object
self.config.disable = [mid for mid, val in six.iteritems(msgs)
if not val]
def enable(self, msgid, scope='package', line=None, ignore_unknown=False):
"""reenable message of the given id"""
assert scope in ('package', 'module')
catid = category_id(msgid)
# msgid is a category?
if catid is not None:
for msgid in self.msgs_store._msgs_by_category.get(catid):
self.enable(msgid, scope, line)
# msgid is a checker name?
if msgid.lower() in self._checkers:
for checker in self._checkers[msgid.lower()]:
for msgid_ in checker.msgs:
self.enable(msgid_, scope, line)
# msgid is report id?
if msgid.lower().startswith('rp'):
# msgid is a symbolic or numeric msgid.
msg = self.msgs_store.check_message_id(msgid)
except UnknownMessage:
if ignore_unknown:
if scope == 'module':
self.file_state.set_msg_status(msg, line, True)
self.add_message('locally-enabled', line=line, args=(msg.symbol, msg.msgid))
msgs = self._msgs_state
msgs[msg.msgid] = True
# sync configuration object
self.config.enable = [mid for mid, val in six.iteritems(msgs) if val]
def get_message_state_scope(self, msgid, line=None, confidence=UNDEFINED):
"""Returns the scope at which a message was enabled/disabled."""
if self.config.confidence and not in self.config.confidence:
if line in self.file_state._module_msgs_state[msgid]:
except (KeyError, TypeError):
def is_message_enabled(self, msg_descr, line=None, confidence=None):
"""return true if the message associated to the given message id is
msgid may be either a numeric or symbolic message id.
if self.config.confidence and confidence:
if not in self.config.confidence:
return False
msgid = self.msgs_store.check_message_id(msg_descr).msgid
except UnknownMessage:
# The linter checks for messages that are not registered
# due to version mismatch, just treat them as message IDs
# for now.
msgid = msg_descr
if line is None:
return self._msgs_state.get(msgid, True)
return self.file_state._module_msgs_state[msgid][line]
except KeyError:
return self._msgs_state.get(msgid, True)
def add_message(self, msg_descr, line=None, node=None, args=None, confidence=UNDEFINED):
"""Adds a message given by ID or name.
If provided, the message string is expanded using args
AST checkers should must the node argument (but may optionally
provide line if the line number is different), raw and token checkers
must provide the line argument.
msg_info = self.msgs_store.check_message_id(msg_descr)
msgid = msg_info.msgid
# backward compatibility, message may not have a symbol
symbol = msg_info.symbol or msgid
# Fatal messages and reports are special, the node/scope distinction
# does not apply to them.
if msgid[0] not in _SCOPE_EXEMPT:
if msg_info.scope == WarningScope.LINE:
assert node is None and line is not None, (
'Message %s must only provide line, got line=%s, node=%s' % (msgid, line, node))
elif msg_info.scope == WarningScope.NODE:
# Node-based warnings may provide an override line.
assert node is not None, 'Message %s must provide Node, got None'
if line is None and node is not None:
line = node.fromlineno
if hasattr(node, 'col_offset'):
col_offset = node.col_offset # XXX measured in bytes for utf-8, divide by two for chars?
col_offset = None
# should this message be displayed
if not self.is_message_enabled(msgid, line, confidence):
self.get_message_state_scope(msgid, line, confidence),
msgid, line, node, args, confidence)
# update stats
msg_cat = MSG_TYPES[msgid[0]]
self.msg_status |= MSG_TYPES_STATUS[msgid[0]]
self.stats[msg_cat] += 1
self.stats['by_module'][self.current_name][msg_cat] += 1
self.stats['by_msg'][symbol] += 1
except KeyError:
self.stats['by_msg'][symbol] = 1
# expand message ?
msg = msg_info.msg
if args:
msg %= args
# get module and object
if node is None:
module, obj = self.current_name, ''
abspath = self.current_file
module, obj = get_module_and_frameid(node)
abspath = node.root().file
path = abspath.replace(self.reporter.path_strip_prefix, '')
# add the message
Message(msgid, symbol,
(abspath, path, module, obj, line or 1, col_offset or 0), msg, confidence))
def print_full_documentation(self):
"""output a full documentation in ReST format"""
print("Pylint global options and switches")
print("Pylint provides global options and switches.")
by_checker = {}
for checker in self.get_checkers():
if == 'master':
if checker.options:
for section, options in checker.options_by_section():
if section is None:
title = 'General options'
title = '%s options' % section.capitalize()
print('~' * len(title))
rest_format_section(sys.stdout, None, options)
by_checker[][0] += checker.options_and_values()
by_checker[][2] += checker.reports
except KeyError:
by_checker[] = [list(checker.options_and_values()),
print("Pylint checkers' options and switches")
print("Pylint checkers can provide three set of features:")
print("* options that control their execution,")
print("* messages that they can raise,")
print("* reports that they can generate.")
print("Below is a list of all checkers and their features.")
for checker, (options, msgs, reports) in six.iteritems(by_checker):
title = '%s checker' % (checker.replace("_", " ").title())
print('~' * len(title))
print("Verbatim name of the checker is ``%s``." % checker)
if options:
title = 'Options'
print('^' * len(title))
rest_format_section(sys.stdout, None, options)
if msgs:
title = 'Messages'
print('~' * len(title))
for msgid, msg in sorted(six.iteritems(msgs),
key=lambda kv: (_MSG_ORDER.index(kv[0][0]), kv[1])):
msg = build_message_def(checker, msgid, msg)
if reports:
title = 'Reports'
print('~' * len(title))
for report in reports:
print(':%s: %s' % report[:2])
class FileState(object):
"""Hold internal state specific to the currently analyzed file"""
def __init__(self, modname=None):
self.base_name = modname
self._module_msgs_state = {}
self._raw_module_msgs_state = {}
self._ignored_msgs = collections.defaultdict(set)
self._suppression_mapping = {}
def collect_block_lines(self, msgs_store, module_node):
"""Walk the AST to collect block level options line numbers."""
for msg, lines in six.iteritems(self._module_msgs_state):
self._raw_module_msgs_state[msg] = lines.copy()
orig_state = self._module_msgs_state.copy()
self._module_msgs_state = {}
self._suppression_mapping = {}
self._collect_block_lines(msgs_store, module_node, orig_state)
def _collect_block_lines(self, msgs_store, node, msg_state):
"""Recursivly walk (depth first) AST to collect block level options line
for child in node.get_children():
self._collect_block_lines(msgs_store, child, msg_state)
first = node.fromlineno
last = node.tolineno
# first child line number used to distinguish between disable
# which are the first child of scoped node with those defined later.
# For instance in the code below:
# 1. def meth8(self):
# 2. """test late disabling"""
# 3. # pylint: disable=E1102
# 4. print self.blip
# 5. # pylint: disable=E1101
# 6. print self.bla
# E1102 should be disabled from line 1 to 6 while E1101 from line 5 to 6
# this is necessary to disable locally messages applying to class /
# function using their fromlineno
if isinstance(node, (nodes.Module, nodes.Class, nodes.Function)) and node.body:
firstchildlineno = node.body[0].fromlineno
firstchildlineno = last
for msgid, lines in six.iteritems(msg_state):
for lineno, state in list(lines.items()):
original_lineno = lineno
if first <= lineno <= last:
# Set state for all lines for this block, if the
# warning is applied to nodes.
if msgs_store.check_message_id(msgid).scope == WarningScope.NODE:
if lineno > firstchildlineno:
state = True
first_, last_ = node.block_range(lineno)
first_ = lineno
last_ = last
for line in range(first_, last_+1):
# do not override existing entries
if not line in self._module_msgs_state.get(msgid, ()):
if line in lines: # state change in the same block
state = lines[line]
original_lineno = line
if not state:
self._suppression_mapping[(msgid, line)] = original_lineno
self._module_msgs_state[msgid][line] = state
except KeyError:
self._module_msgs_state[msgid] = {line: state}
del lines[lineno]
def set_msg_status(self, msg, line, status):
"""Set status (enabled/disable) for a given message at a given line"""
assert line > 0
self._module_msgs_state[msg.msgid][line] = status
except KeyError:
self._module_msgs_state[msg.msgid] = {line: status}
def handle_ignored_message(self, state_scope, msgid, line,
node, args, confidence): # pylint: disable=unused-argument
"""Report an ignored message.
depending on whether the message was disabled locally in the module,
or globally. The other arguments are the same as for add_message.
if state_scope == MSG_STATE_SCOPE_MODULE:
orig_line = self._suppression_mapping[(msgid, line)]
self._ignored_msgs[(msgid, orig_line)].add(line)
except KeyError:
def iter_spurious_suppression_messages(self, msgs_store):
for warning, lines in six.iteritems(self._raw_module_msgs_state):
for line, enable in six.iteritems(lines):
if not enable and (warning, line) not in self._ignored_msgs:
yield 'useless-suppression', line, \
# don't use iteritems here, _ignored_msgs may be modified by add_message
for (warning, from_), lines in list(self._ignored_msgs.items()):
for line in lines:
yield 'suppressed-message', line, \
(msgs_store.get_msg_display_string(warning), from_)
class MessagesStore(object):
"""The messages store knows information about every possible message but has
no particular state during analysis.
def __init__(self):
# Primary registry for all active messages (i.e. all messages
# that can be emitted by pylint for the underlying Python
# version). It contains the 1:1 mapping from symbolic names
# to message definition objects.
self._messages = {}
# Maps alternative names (numeric IDs, deprecated names) to
# message definitions. May contain several names for each definition
# object.
self._alternative_names = {}
self._msgs_by_category = collections.defaultdict(list)
def messages(self):
"""The list of all active messages."""
return six.itervalues(self._messages)
def add_renamed_message(self, old_id, old_symbol, new_symbol):
"""Register the old ID and symbol for a warning that was renamed.
This allows users to keep using the old ID/symbol in suppressions.
msg = self.check_message_id(new_symbol)
msg.old_names.append((old_id, old_symbol))
self._alternative_names[old_id] = msg
self._alternative_names[old_symbol] = msg
def register_messages(self, checker):
"""register a dictionary of messages
Keys are message ids, values are a 2-uple with the message type and the
message itself
message ids should be a string of len 4, where the two first characters
are the checker id and the two last the message id in this checker
chkid = None
for msgid, msg_tuple in six.iteritems(checker.msgs):
msg = build_message_def(checker, msgid, msg_tuple)
assert msg.symbol not in self._messages, \
'Message symbol %r is already defined' % msg.symbol
# avoid duplicate / malformed ids
assert msg.msgid not in self._alternative_names, \
'Message id %r is already defined' % msgid
assert chkid is None or chkid == msg.msgid[1:3], \
'Inconsistent checker part in message id %r' % msgid
chkid = msg.msgid[1:3]
self._messages[msg.symbol] = msg
self._alternative_names[msg.msgid] = msg
for old_id, old_symbol in msg.old_names:
self._alternative_names[old_id] = msg
self._alternative_names[old_symbol] = msg
def check_message_id(self, msgid):
"""returns the Message object for this message.
msgid may be either a numeric or symbolic id.
Raises UnknownMessage if the message id is not defined.
if msgid[1:].isdigit():
msgid = msgid.upper()
for source in (self._alternative_names, self._messages):
return source[msgid]
except KeyError:
raise UnknownMessage('No such message id %s' % msgid)
def get_msg_display_string(self, msgid):
"""Generates a user-consumable representation of a message.
Can be just the message ID or the ID and the symbol.
return repr(self.check_message_id(msgid).symbol)
def help_message(self, msgids):
"""display help messages for the given message identifiers"""
for msgid in msgids:
except UnknownMessage as ex:
def list_messages(self):
"""output full messages list documentation in ReST format"""
msgs = sorted(six.itervalues(self._messages), key=lambda msg: msg.msgid)
for msg in msgs:
if not msg.may_be_emitted():
class ReportsHandlerMixIn(object):
"""a mix-in class containing all the reports and stats manipulation
related methods for the main lint class
def __init__(self):
self._reports = collections.defaultdict(list)
self._reports_state = {}
def report_order(self):
""" Return a list of reports, sorted in the order
in which they must be called.
return list(self._reports)
def register_report(self, reportid, r_title, r_cb, checker):
"""register a report
reportid is the unique identifier for the report
r_title the report's title
r_cb the method to call to make the report
checker is the checker defining the report
reportid = reportid.upper()
self._reports[checker].append((reportid, r_title, r_cb))
def enable_report(self, reportid):
"""disable the report of the given id"""
reportid = reportid.upper()
self._reports_state[reportid] = True
def disable_report(self, reportid):
"""disable the report of the given id"""
reportid = reportid.upper()
self._reports_state[reportid] = False
def report_is_enabled(self, reportid):
"""return true if the report associated to the given identifier is
return self._reports_state.get(reportid, True)
def make_reports(self, stats, old_stats):
"""render registered reports"""
sect = Section('Report',
'%s statements analysed.'% (self.stats['statement']))
for checker in self.report_order():
for reportid, r_title, r_cb in self._reports[checker]:
if not self.report_is_enabled(reportid):
report_sect = Section(r_title)
r_cb(report_sect, stats, old_stats)
except EmptyReport:
report_sect.report_id = reportid
return sect
def add_stats(self, **kwargs):
"""add some stats entries to the statistic dictionary
raise an AssertionError if there is a key conflict
for key, value in six.iteritems(kwargs):
if key[-1] == '_':
key = key[:-1]
assert key not in self.stats
self.stats[key] = value
return self.stats
def expand_modules(files_or_modules, black_list):
"""take a list of files/modules/packages and return the list of tuple
(file, module name) which have to be actually checked
result = []
errors = []
for something in files_or_modules:
if exists(something):
# this is a file or a directory
modname = '.'.join(modpath_from_file(something))
except ImportError:
modname = splitext(basename(something))[0]
if isdir(something):
filepath = join(something, '')
filepath = something
# suppose it's a module or package
modname = something
filepath = file_from_modpath(modname.split('.'))
if filepath is None:
errors.append({'key' : 'ignored-builtin-module', 'mod': modname})
except (ImportError, SyntaxError) as ex:
# FIXME p3k : the SyntaxError is a Python bug and should be
# removed as soon as possible
errors.append({'key': 'fatal', 'mod': modname, 'ex': ex})
filepath = normpath(filepath)
result.append({'path': filepath, 'name': modname, 'isarg': True,
'basepath': filepath, 'basename': modname})
if not (modname.endswith('.__init__') or modname == '__init__') \
and '' in filepath:
for subfilepath in get_module_files(dirname(filepath), black_list):
if filepath == subfilepath:
submodname = '.'.join(modpath_from_file(subfilepath))
result.append({'path': subfilepath, 'name': submodname,
'isarg': False,
'basepath': filepath, 'basename': modname})
return result, errors
class PyLintASTWalker(object):
def __init__(self, linter):
# callbacks per node types
self.nbstatements = 1
self.visit_events = collections.defaultdict(list)
self.leave_events = collections.defaultdict(list)
self.linter = linter
def _is_method_enabled(self, method):
if not hasattr(method, 'checks_msgs'):
return True
for msg_desc in method.checks_msgs:
if self.linter.is_message_enabled(msg_desc):
return True
return False
def add_checker(self, checker):
"""walk to the checker's dir and collect visit and leave methods"""
# XXX : should be possible to merge needed_checkers and add_checker
vcids = set()
lcids = set()
visits = self.visit_events
leaves = self.leave_events
for member in dir(checker):
cid = member[6:]
if cid == 'default':
if member.startswith('visit_'):
v_meth = getattr(checker, member)
# don't use visit_methods with no activated message:
if self._is_method_enabled(v_meth):
elif member.startswith('leave_'):
l_meth = getattr(checker, member)
# don't use leave_methods with no activated message:
if self._is_method_enabled(l_meth):
visit_default = getattr(checker, 'visit_default', None)
if visit_default:
for cls in nodes.ALL_NODE_CLASSES:
cid = cls.__name__.lower()
if cid not in vcids:
# for now we have no "leave_default" method in Pylint
def walk(self, astroid):
"""call visit events of astroid checkers for the given node, recurse on
its children, then leave events.
cid = astroid.__class__.__name__.lower()
if astroid.is_statement:
self.nbstatements += 1
# generate events for this node on each checker
for cb in self.visit_events.get(cid, ()):
# recurse on children
for child in astroid.get_children():
for cb in self.leave_events.get(cid, ()):
PY_EXTS = ('.py', '.pyc', '.pyo', '.pyw', '.so', '.dll')
def register_plugins(linter, directory):
"""load all module and package in the given directory, looking for a
'register' function in each one, used to register pylint checkers
imported = {}
for filename in os.listdir(directory):
base, extension = splitext(filename)
if base in imported or base == '__pycache__':
if extension in PY_EXTS and base != '__init__' or (
not extension and isdir(join(directory, base))):
module = load_module_from_file(join(directory, filename))
except ValueError:
# empty module name (usually emacs auto-save files)
except ImportError as exc:
print("Problem importing module %s: %s" % (filename, exc),
if hasattr(module, 'register'):
imported[base] = 1
def get_global_option(checker, option, default=None):
""" Retrieve an option defined by the given *checker* or
by all known option providers.
It will look in the list of all options providers
until the given *option* will be found.
If the option wasn't found, the *default* value will be returned.
# First, try in the given checker's config.
# After that, look in the options providers.
return getattr(checker.config, option.replace("-", "_"))
except AttributeError:
for provider in checker.linter.options_providers:
for options in provider.options:
if options[0] == option:
return getattr(provider.config, option.replace("-", "_"))
return default