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# -*- coding: utf-8 -*-
"""Checker of PEP-8 Naming Conventions."""
import optparse
import re
import sys
from collections import deque
try:
import ast
from ast import iter_child_nodes
except ImportError:
from flake8.util import ast, iter_child_nodes
__version__ = '0.4.1'
LOWERCASE_REGEX = re.compile(r'[_a-z][_a-z0-9]*$')
UPPERCASE_REGEX = re.compile(r'[_A-Z][_A-Z0-9]*$')
MIXEDCASE_REGEX = re.compile(r'_?[A-Z][a-zA-Z0-9]*$')
SPLIT_IGNORED_RE = re.compile(r'[,\s]')
if sys.version_info[0] < 3:
def _unpack_args(args):
ret = []
for arg in args:
if isinstance(arg, ast.Tuple):
ret.extend(_unpack_args(arg.elts))
else:
ret.append(arg.id)
return ret
def get_arg_names(node):
return _unpack_args(node.args.args)
else:
def get_arg_names(node):
pos_args = [arg.arg for arg in node.args.args]
kw_only = [arg.arg for arg in node.args.kwonlyargs]
return pos_args + kw_only
class _ASTCheckMeta(type):
def __init__(self, class_name, bases, namespace):
try:
self._checks.append(self())
except AttributeError:
self._checks = []
def _err(self, node, code):
lineno, col_offset = node.lineno, node.col_offset
if isinstance(node, ast.ClassDef):
lineno += len(node.decorator_list)
col_offset += 6
elif isinstance(node, ast.FunctionDef):
lineno += len(node.decorator_list)
col_offset += 4
return (lineno, col_offset, '%s %s' % (code, getattr(self, code)), self)
BaseASTCheck = _ASTCheckMeta('BaseASTCheck', (object,),
{'__doc__': "Base for AST Checks.", 'err': _err})
def register_opt(parser, *args, **kwargs):
try:
# Flake8 3.x registration
parser.add_option(*args, **kwargs)
except (optparse.OptionError, TypeError):
# Flake8 2.x registration
parse_from_config = kwargs.pop('parse_from_config', False)
kwargs.pop('comma_separated_list', False)
kwargs.pop('normalize_paths', False)
parser.add_option(*args, **kwargs)
if parse_from_config:
parser.config_options.append(args[-1].lstrip('-'))
class NamingChecker(object):
"""Checker of PEP-8 Naming Conventions."""
name = 'naming'
version = __version__
ignore_names = ['setUp', 'tearDown', 'setUpClass', 'tearDownClass']
def __init__(self, tree, filename):
self.visitors = BaseASTCheck._checks
self.parents = deque()
self._node = tree
@classmethod
def add_options(cls, parser):
ignored = ','.join(cls.ignore_names)
register_opt(parser, '--ignore-names',
default=ignored,
action='store',
type='string',
parse_from_config=True,
comma_separated_list=True,
help='List of names the pep8-naming plugin should '
'ignore. (Defaults to %default)')
@classmethod
def parse_options(cls, options):
cls.ignore_names = options.ignore_names
if not isinstance(cls.ignore_names, list):
cls.ignore_names = SPLIT_IGNORED_RE.split(options.ignore_names)
def run(self):
return self.visit_tree(self._node) if self._node else ()
def visit_tree(self, node):
for error in self.visit_node(node):
yield error
self.parents.append(node)
for child in iter_child_nodes(node):
for error in self.visit_tree(child):
yield error
self.parents.pop()
def visit_node(self, node):
if isinstance(node, ast.ClassDef):
self.tag_class_functions(node)
elif isinstance(node, ast.FunctionDef):
self.find_global_defs(node)
method = 'visit_' + node.__class__.__name__.lower()
parents = self.parents
ignore_names = self.ignore_names
for visitor in self.visitors:
visitor_method = getattr(visitor, method, None)
if visitor_method is None:
continue
for error in visitor_method(node, parents, ignore_names):
yield error
def tag_class_functions(self, cls_node):
"""Tag functions if they are methods, classmethods, staticmethods"""
# tries to find all 'old style decorators' like
# m = staticmethod(m)
late_decoration = {}
for node in iter_child_nodes(cls_node):
if not (isinstance(node, ast.Assign) and
isinstance(node.value, ast.Call) and
isinstance(node.value.func, ast.Name)):
continue
func_name = node.value.func.id
if func_name in ('classmethod', 'staticmethod'):
meth = (len(node.value.args) == 1 and node.value.args[0])
if isinstance(meth, ast.Name):
late_decoration[meth.id] = func_name
# iterate over all functions and tag them
for node in iter_child_nodes(cls_node):
if not isinstance(node, ast.FunctionDef):
continue
node.function_type = 'method'
if node.name == '__new__':
node.function_type = 'classmethod'
if node.name in late_decoration:
node.function_type = late_decoration[node.name]
elif node.decorator_list:
names = [d.id for d in node.decorator_list
if isinstance(d, ast.Name) and
d.id in ('classmethod', 'staticmethod')]
if names:
node.function_type = names[0]
def find_global_defs(self, func_def_node):
global_names = set()
nodes_to_check = deque(iter_child_nodes(func_def_node))
while nodes_to_check:
node = nodes_to_check.pop()
if isinstance(node, ast.Global):
global_names.update(node.names)
if not isinstance(node, (ast.FunctionDef, ast.ClassDef)):
nodes_to_check.extend(iter_child_nodes(node))
func_def_node.global_names = global_names
class ClassNameCheck(BaseASTCheck):
"""
Almost without exception, class names use the CapWords convention.
Classes for internal use have a leading underscore in addition.
"""
check = MIXEDCASE_REGEX.match
N801 = "class names should use CapWords convention"
def visit_classdef(self, node, parents, ignore=None):
if not self.check(node.name):
yield self.err(node, 'N801')
class FunctionNameCheck(BaseASTCheck):
"""
Function names should be lowercase, with words separated by underscores
as necessary to improve readability.
Functions *not* beeing methods '__' in front and back are not allowed.
mixedCase is allowed only in contexts where that's already the
prevailing style (e.g. threading.py), to retain backwards compatibility.
"""
check = LOWERCASE_REGEX.match
N802 = "function name should be lowercase"
def visit_functiondef(self, node, parents, ignore=None):
function_type = getattr(node, 'function_type', 'function')
name = node.name
if ignore and name in ignore:
return
if ((function_type == 'function' and '__' in (name[:2], name[-2:])) or
not self.check(name)):
yield self.err(node, 'N802')
class FunctionArgNamesCheck(BaseASTCheck):
"""
The argument names of a function should be lowercase, with words separated
by underscores.
A classmethod should have 'cls' as first argument.
A method should have 'self' as first argument.
"""
check = LOWERCASE_REGEX.match
N803 = "argument name should be lowercase"
N804 = "first argument of a classmethod should be named 'cls'"
N805 = "first argument of a method should be named 'self'"
def visit_functiondef(self, node, parents, ignore=None):
def arg_name(arg):
return getattr(arg, 'arg', arg)
kwarg = arg_name(node.args.kwarg)
if kwarg is not None:
if not self.check(kwarg):
yield self.err(node, 'N803')
return
vararg = arg_name(node.args.vararg)
if vararg is not None:
if not self.check(vararg):
yield self.err(node, 'N803')
return
arg_names = get_arg_names(node)
if not arg_names:
return
function_type = getattr(node, 'function_type', 'function')
if function_type == 'method':
if arg_names[0] != 'self':
yield self.err(node, 'N805')
elif function_type == 'classmethod':
if arg_names[0] != 'cls':
yield self.err(node, 'N804')
for arg in arg_names:
if not self.check(arg):
yield self.err(node, 'N803')
return
class ImportAsCheck(BaseASTCheck):
"""
Don't change the naming convention via an import
"""
check_lower = LOWERCASE_REGEX.match
check_upper = UPPERCASE_REGEX.match
N811 = "constant imported as non constant"
N812 = "lowercase imported as non lowercase"
N813 = "camelcase imported as lowercase"
N814 = "camelcase imported as constant"
def visit_importfrom(self, node, parents, ignore=None):
for name in node.names:
if not name.asname:
continue
if self.check_upper(name.name):
if not self.check_upper(name.asname):
yield self.err(node, 'N811')
elif self.check_lower(name.name):
if not self.check_lower(name.asname):
yield self.err(node, 'N812')
elif self.check_lower(name.asname):
yield self.err(node, 'N813')
elif self.check_upper(name.asname):
yield self.err(node, 'N814')
class VariablesInFunctionCheck(BaseASTCheck):
"""
Local variables in functions should be lowercase
"""
check = LOWERCASE_REGEX.match
N806 = "variable in function should be lowercase"
def visit_assign(self, node, parents, ignore=None):
for parent_func in reversed(parents):
if isinstance(parent_func, ast.ClassDef):
return
if isinstance(parent_func, ast.FunctionDef):
break
else:
return
for target in node.targets:
name = isinstance(target, ast.Name) and target.id
if not name or name in parent_func.global_names:
return
if not self.check(name) and name[:1] != '_':
if isinstance(node.value, ast.Call):
if isinstance(node.value.func, ast.Attribute):
if node.value.func.attr == 'namedtuple':
return
elif isinstance(node.value.func, ast.Name):
if node.value.func.id == 'namedtuple':
return
yield self.err(target, 'N806')