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depot_tools/third_party/pylint/utils.py

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# Copyright (c) 2003-2010 Sylvain Thenault (thenault@gmail.com).
# Copyright (c) 2003-2010 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.,
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"""some various utilities and helper classes, most of them used in the
main pylint class
"""
import sys
from os import linesep
from os.path import dirname, basename, splitext, exists, isdir, join, normpath
from logilab.common.modutils import modpath_from_file, get_module_files, \
file_from_modpath
from logilab.common.textutils import normalize_text
from logilab.common.configuration import rest_format_section
from logilab.common.ureports import Section
from logilab.astng import nodes, Module
from pylint.checkers import EmptyReport
class UnknownMessage(Exception):
"""raised when a unregistered message id is encountered"""
MSG_TYPES = {
'I' : 'info',
'C' : 'convention',
'R' : 'refactor',
'W' : 'warning',
'E' : 'error',
'F' : 'fatal'
}
MSG_TYPES_LONG = dict([(v, k) for k, v in MSG_TYPES.iteritems()])
MSG_TYPES_STATUS = {
'I' : 0,
'C' : 16,
'R' : 8,
'W' : 4,
'E' : 2,
'F' : 1
}
_MSG_ORDER = 'EWRCIF'
def sort_msgs(msgids):
"""sort message identifiers according to their category first"""
msgs = {}
for msg in msgids:
msgs.setdefault(msg[0], []).append(msg)
result = []
for m_id in _MSG_ORDER:
if m_id in msgs:
result.extend( sorted(msgs[m_id]) )
return result
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 = frame.name
else:
obj.append(getattr(frame, 'name', '<lambda>'))
try:
frame = frame.parent.frame()
except AttributeError:
frame = None
obj.reverse()
return module, '.'.join(obj)
def category_id(id):
id = id.upper()
if id in MSG_TYPES:
return id
return MSG_TYPES_LONG.get(id)
class Message:
def __init__(self, checker, msgid, msg, descr):
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.checker = checker
class MessagesHandlerMixIn:
"""a mix-in class containing all the messages related methods for the main
lint class
"""
def __init__(self):
# dictionary of registered messages
self._messages = {}
self._msgs_state = {}
self._module_msgs_state = {} # None
self._msgs_by_category = {}
self.msg_status = 0
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
"""
msgs_dict = checker.msgs
chkid = None
for msgid, (msg, msgdescr) in msgs_dict.items():
# avoid duplicate / malformed ids
assert msgid not in self._messages, \
'Message id %r is already defined' % msgid
assert chkid is None or chkid == msgid[1:3], \
'Inconsistent checker part in message id %r' % msgid
chkid = msgid[1:3]
self._messages[msgid] = Message(checker, msgid, msg, msgdescr)
self._msgs_by_category.setdefault(msgid[0], []).append(msgid)
def get_message_help(self, msgid, checkerref=False):
"""return the help string for the given message id"""
msg = self.check_message_id(msgid)
desc = normalize_text(' '.join(msg.descr.split()), indent=' ')
if checkerref:
desc += ' This message belongs to the %s checker.' % \
msg.checker.name
title = msg.msg
if title != '%s':
title = title.splitlines()[0]
return ':%s: *%s*\n%s' % (msg.msgid, title, desc)
return ':%s:\n%s' % (msg.msgid, desc)
def disable(self, msgid, scope='package', line=None):
"""don't output message of the given id"""
assert scope in ('package', 'module')
# msgid is a category?
catid = category_id(msgid)
if catid is not None:
for msgid in self._msgs_by_category.get(catid):
self.disable(msgid, scope, line)
return
# msgid is a checker name?
if msgid.lower() in self._checkers:
for checker in self._checkers[msgid.lower()]:
for msgid in checker.msgs:
self.disable(msgid, scope, line)
return
# msgid is report id?
if msgid.lower().startswith('rp'):
self.disable_report(msgid)
return
# msgid is a msgid.
msg = self.check_message_id(msgid)
if scope == 'module':
assert line > 0
try:
self._module_msgs_state[msg.msgid][line] = False
except KeyError:
self._module_msgs_state[msg.msgid] = {line: False}
if msgid != 'I0011':
self.add_message('I0011', line=line, args=msg.msgid)
else:
msgs = self._msgs_state
msgs[msg.msgid] = False
# sync configuration object
self.config.disable_msg = [mid for mid, val in msgs.items()
if not val]
def enable(self, msgid, scope='package', line=None):
"""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_by_category.get(catid):
self.enable(msgid, scope, line)
return
# 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)
return
# msgid is report id?
if msgid.lower().startswith('rp'):
self.enable_report(msgid)
return
# msgid is a msgid.
msg = self.check_message_id(msgid)
if scope == 'module':
assert line > 0
try:
self._module_msgs_state[msg.msgid][line] = True
except KeyError:
self._module_msgs_state[msg.msgid] = {line: True}
self.add_message('I0012', line=line, args=msg.msgid)
else:
msgs = self._msgs_state
msgs[msg.msgid] = True
# sync configuration object
self.config.enable = [mid for mid, val in msgs.items() if val]
def check_message_id(self, msgid):
"""raise UnknownMessage if the message id is not defined"""
msgid = msgid.upper()
try:
return self._messages[msgid]
except KeyError:
raise UnknownMessage('No such message id %s' % msgid)
def is_message_enabled(self, msgid, line=None):
"""return true if the message associated to the given message id is
enabled
"""
if line is None:
return self._msgs_state.get(msgid, True)
try:
return self._module_msgs_state[msgid][line]
except (KeyError, TypeError):
return self._msgs_state.get(msgid, True)
def add_message(self, msgid, line=None, node=None, args=None):
"""add the message corresponding to the given id.
If provided, msg is expanded using args
astng checkers should provide the node argument, raw checkers should
provide the line argument.
"""
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?
else:
col_offset = None
# should this message be displayed
if not self.is_message_enabled(msgid, line):
return
# 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
try:
self.stats['by_msg'][msgid] += 1
except KeyError:
self.stats['by_msg'][msgid] = 1
msg = self._messages[msgid].msg
# expand message ?
if args:
msg %= args
# get module and object
if node is None:
module, obj = self.current_name, ''
path = self.current_file
else:
module, obj = get_module_and_frameid(node)
path = node.root().file
# add the message
self.reporter.add_message(msgid, (path, module, obj, line or 1, col_offset or 0), msg)
def help_message(self, msgids):
"""display help messages for the given message identifiers"""
for msgid in msgids:
try:
print self.get_message_help(msgid, True)
print
except UnknownMessage, ex:
print ex
print
continue
def print_full_documentation(self):
"""output a full documentation in ReST format"""
by_checker = {}
for checker in self.get_checkers():
if checker.name == 'master':
prefix = 'Main '
print "Options"
print '-------\n'
if checker.options:
for section, options in checker.options_by_section():
if section is None:
title = 'General options'
else:
title = '%s options' % section.capitalize()
print title
print '~' * len(title)
rest_format_section(sys.stdout, None, options)
print
else:
try:
by_checker[checker.name][0] += checker.options_and_values()
by_checker[checker.name][1].update(checker.msgs)
by_checker[checker.name][2] += checker.reports
except KeyError:
by_checker[checker.name] = [list(checker.options_and_values()),
dict(checker.msgs),
list(checker.reports)]
for checker, (options, msgs, reports) in by_checker.items():
prefix = ''
title = '%s checker' % checker
print title
print '-' * len(title)
print
if options:
title = 'Options'
print title
print '~' * len(title)
rest_format_section(sys.stdout, None, options)
print
if msgs:
title = ('%smessages' % prefix).capitalize()
print title
print '~' * len(title)
for msgid in sort_msgs(msgs.keys()):
print self.get_message_help(msgid, False)
print
if reports:
title = ('%sreports' % prefix).capitalize()
print title
print '~' * len(title)
for report in reports:
print ':%s: %s' % report[:2]
print
print
def list_messages(self):
"""output full messages list documentation in ReST format"""
msgids = []
for checker in self.get_checkers():
for msgid in checker.msgs.keys():
msgids.append(msgid)
msgids.sort()
for msgid in msgids:
print self.get_message_help(msgid, False)
print
class ReportsHandlerMixIn:
"""a mix-in class containing all the reports and stats manipulation
related methods for the main lint class
"""
def __init__(self):
self._reports = {}
self._reports_state = {}
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.setdefault(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
enabled
"""
return self._reports_state.get(reportid, True)
def make_reports(self, stats, old_stats):
"""render registered reports"""
if self.config.files_output:
filename = 'pylint_global.' + self.reporter.extension
self.reporter.set_output(open(filename, 'w'))
sect = Section('Report',
'%s statements analysed.'% (self.stats['statement']))
for checker in self._reports:
for reportid, r_title, r_cb in self._reports[checker]:
if not self.report_is_enabled(reportid):
continue
report_sect = Section(r_title)
try:
r_cb(report_sect, stats, old_stats)
except EmptyReport:
continue
report_sect.report_id = reportid
sect.append(report_sect)
self.reporter.display_results(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 kwargs.items():
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
try:
modname = '.'.join(modpath_from_file(something))
except ImportError:
modname = splitext(basename(something))[0]
if isdir(something):
filepath = join(something, '__init__.py')
else:
filepath = something
else:
# suppose it's a module or package
modname = something
try:
filepath = file_from_modpath(modname.split('.'))
if filepath is None:
errors.append( {'key' : 'F0003', 'mod': modname} )
continue
except (ImportError, SyntaxError), ex:
# FIXME p3k : the SyntaxError is a Python bug and should be
# removed as soon as possible http://bugs.python.org/issue10588
errors.append( {'key': 'F0001', 'mod': modname, 'ex': ex} )
continue
filepath = normpath(filepath)
result.append( {'path': filepath, 'name': modname,
'basepath': filepath, 'basename': modname} )
if not (modname.endswith('.__init__') or modname == '__init__') \
and '__init__.py' in filepath:
for subfilepath in get_module_files(dirname(filepath), black_list):
if filepath == subfilepath:
continue
submodname = '.'.join(modpath_from_file(subfilepath))
result.append( {'path': subfilepath, 'name': submodname,
'basepath': filepath, 'basename': modname} )
return result, errors
class PyLintASTWalker(object):
def __init__(self, linter):
# callbacks per node types
self.nbstatements = 1
self.visit_events = {}
self.leave_events = {}
self.linter = linter
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
msgs = self.linter._msgs_state
for member in dir(checker):
cid = member[6:]
if cid == 'default':
continue
if member.startswith('visit_'):
v_meth = getattr(checker, member)
# don't use visit_methods with no activated message:
if hasattr(v_meth, 'checks_msgs'):
if not any(msgs.get(m, True) for m in v_meth.checks_msgs):
continue
visits.setdefault(cid, []).append(v_meth)
vcids.add(cid)
elif member.startswith('leave_'):
l_meth = getattr(checker, member)
# don't use leave_methods with no activated message:
if hasattr(l_meth, 'checks_msgs'):
if not any(msgs.get(m, True) for m in l_meth.checks_msgs):
continue
leaves.setdefault(cid, []).append(l_meth)
lcids.add(cid)
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:
visits.setdefault(cid, []).append(visit_default)
# for now we have no "leave_default" method in Pylint
def walk(self, astng):
"""call visit events of astng checkers for the given node, recurse on
its children, then leave events.
"""
cid = astng.__class__.__name__.lower()
if astng.is_statement:
self.nbstatements += 1
# generate events for this node on each checker
for cb in self.visit_events.get(cid, ()):
cb(astng)
# recurse on children
for child in astng.get_children():
self.walk(child)
for cb in self.leave_events.get(cid, ()):
cb(astng)
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