#!/usr/bin/env python

import ast
import collections

from .. import namespace

Flake8Result = collections.namedtuple(
    'Flake8Result',
    ['lineno', 'col_offset', 'message']
)


class BaseLinter(ast.NodeVisitor):
    def __init__(self, *args, **kwargs):
        self.results = []
        self.namespace = None

        super(BaseLinter, self).__init__(*args, **kwargs)

    def get_results(self):

        return self.results

    def visit(self, node):
        if not self.namespace:
            # In MultiNodeVisitor runs this will have already been set since
            # the namespace remains the same for each linter. However, during
            # testing or single-linter runs we still need to initialize the
            # namespace for the linter.
            self.namespace = namespace.Namespace.from_module_node(node)

        super(BaseLinter, self).visit(node)