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# Copyright (c) 2002-2013 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.
"""
generic classes/functions for pyreverse core/extensions
"""
from __future__ import print_function
import os
import re
import sys
########### pyreverse option utils ##############################
RCFILE = '.pyreverserc'
def get_default_options():
"""
Read config file and return list of options
"""
options = []
home = os.environ.get('HOME', '')
if home:
rcfile = os.path.join(home, RCFILE)
try:
options = open(rcfile).read().split()
except IOError:
pass # ignore if no config file found
return options
def insert_default_options():
"""insert default options to sys.argv
"""
options = get_default_options()
options.reverse()
for arg in options:
sys.argv.insert(1, arg)
# astroid utilities ###########################################################
SPECIAL = re.compile('^__[A-Za-z0-9]+[A-Za-z0-9_]*__$')
PRIVATE = re.compile('^__[_A-Za-z0-9]*[A-Za-z0-9]+_?$')
PROTECTED = re.compile('^_[_A-Za-z0-9]*$')
def get_visibility(name):
"""return the visibility from a name: public, protected, private or special
"""
if SPECIAL.match(name):
visibility = 'special'
elif PRIVATE.match(name):
visibility = 'private'
elif PROTECTED.match(name):
visibility = 'protected'
else:
visibility = 'public'
return visibility
ABSTRACT = re.compile('^.*Abstract.*')
FINAL = re.compile('^[A-Z_]*$')
def is_abstract(node):
"""return true if the given class node correspond to an abstract class
definition
"""
return ABSTRACT.match(node.name)
def is_final(node):
"""return true if the given class/function node correspond to final
definition
"""
return FINAL.match(node.name)
def is_interface(node):
# bw compat
return node.type == 'interface'
def is_exception(node):
# bw compat
return node.type == 'exception'
# Helpers #####################################################################
_CONSTRUCTOR = 1
_SPECIAL = 2
_PROTECTED = 4
_PRIVATE = 8
MODES = {
'ALL' : 0,
'PUB_ONLY' : _SPECIAL + _PROTECTED + _PRIVATE,
'SPECIAL' : _SPECIAL,
'OTHER' : _PROTECTED + _PRIVATE,
}
VIS_MOD = {'special': _SPECIAL, 'protected': _PROTECTED,
'private': _PRIVATE, 'public': 0}
class FilterMixIn(object):
"""filter nodes according to a mode and nodes' visibility
"""
def __init__(self, mode):
"init filter modes"
__mode = 0
for nummod in mode.split('+'):
try:
__mode += MODES[nummod]
except KeyError as ex:
print('Unknown filter mode %s' % ex, file=sys.stderr)
self.__mode = __mode
def show_attr(self, node):
"""return true if the node should be treated
"""
visibility = get_visibility(getattr(node, 'name', node))
return not self.__mode & VIS_MOD[visibility]
class ASTWalker(object):
"""a walker visiting a tree in preorder, calling on the handler:
* visit_<class name> on entering a node, where class name is the class of
the node in lower case
* leave_<class name> on leaving a node, where class name is the class of
the node in lower case
"""
def __init__(self, handler):
self.handler = handler
self._cache = {}
def walk(self, node, _done=None):
"""walk on the tree from <node>, getting callbacks from handler"""
if _done is None:
_done = set()
if node in _done:
raise AssertionError((id(node), node, node.parent))
_done.add(node)
self.visit(node)
for child_node in node.get_children():
assert child_node is not node
self.walk(child_node, _done)
self.leave(node)
assert node.parent is not node
def get_callbacks(self, node):
"""get callbacks from handler for the visited node"""
klass = node.__class__
methods = self._cache.get(klass)
if methods is None:
handler = self.handler
kid = klass.__name__.lower()
e_method = getattr(handler, 'visit_%s' % kid,
getattr(handler, 'visit_default', None))
l_method = getattr(handler, 'leave_%s' % kid,
getattr(handler, 'leave_default', None))
self._cache[klass] = (e_method, l_method)
else:
e_method, l_method = methods
return e_method, l_method
def visit(self, node):
"""walk on the tree from <node>, getting callbacks from handler"""
method = self.get_callbacks(node)[0]
if method is not None:
method(node)
def leave(self, node):
"""walk on the tree from <node>, getting callbacks from handler"""
method = self.get_callbacks(node)[1]
if method is not None:
method(node)
class LocalsVisitor(ASTWalker):
"""visit a project by traversing the locals dictionary"""
def __init__(self):
ASTWalker.__init__(self, self)
self._visited = {}
def visit(self, node):
"""launch the visit starting from the given node"""
if node in self._visited:
return
self._visited[node] = 1 # FIXME: use set ?
methods = self.get_callbacks(node)
if methods[0] is not None:
methods[0](node)
if hasattr(node, 'locals'): # skip Instance and other proxy
for local_node in node.values():
self.visit(local_node)
if methods[1] is not None:
return methods[1](node)
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