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87 lines
2.9 KiB
Python
87 lines
2.9 KiB
Python
# (c) 2018, Matt Martz <matt@sivel.net>
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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# -*- coding: utf-8 -*-
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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import sys
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import six
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import astroid
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from pylint.interfaces import IAstroidChecker
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from pylint.checkers import BaseChecker
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from pylint.checkers import utils
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from pylint.checkers.utils import check_messages
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from pylint.checkers.strings import parse_format_method_string
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_PY3K = sys.version_info[:2] >= (3, 0)
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MSGS = {
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'E9305': ("Format string contains automatic field numbering "
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"specification",
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"ansible-format-automatic-specification",
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"Used when a PEP 3101 format string contains automatic "
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"field numbering (e.g. '{}').",
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{'minversion': (2, 6)}),
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'E9390': ("bytes object has no .format attribute",
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"ansible-no-format-on-bytestring",
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"Used when a bytestring was used as a PEP 3101 format string "
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"as Python3 bytestrings do not have a .format attribute",
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{'minversion': (3, 0)}),
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}
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class AnsibleStringFormatChecker(BaseChecker):
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"""Checks string formatting operations to ensure that the format string
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is valid and the arguments match the format string.
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"""
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__implements__ = (IAstroidChecker,)
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name = 'string'
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msgs = MSGS
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@check_messages(*(MSGS.keys()))
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def visit_call(self, node):
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func = utils.safe_infer(node.func)
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if (isinstance(func, astroid.BoundMethod)
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and isinstance(func.bound, astroid.Instance)
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and func.bound.name in ('str', 'unicode', 'bytes')):
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if func.name == 'format':
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self._check_new_format(node, func)
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def _check_new_format(self, node, func):
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""" Check the new string formatting """
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if (isinstance(node.func, astroid.Attribute)
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and not isinstance(node.func.expr, astroid.Const)):
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return
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try:
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strnode = next(func.bound.infer())
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except astroid.InferenceError:
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return
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if not isinstance(strnode, astroid.Const):
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return
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if _PY3K and isinstance(strnode.value, six.binary_type):
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self.add_message('ansible-no-format-on-bytestring', node=node)
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return
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if not isinstance(strnode.value, six.string_types):
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return
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if node.starargs or node.kwargs:
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return
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try:
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fields, num_args, manual_pos = parse_format_method_string(strnode.value)
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except utils.IncompleteFormatString:
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return
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if num_args:
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self.add_message('ansible-format-automatic-specification',
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node=node)
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return
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def register(linter):
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"""required method to auto register this checker """
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linter.register_checker(AnsibleStringFormatChecker(linter))
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