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from io import StringIO
from typing import List

from pylint.exceptions import UnknownMessageError
from pylint.message import Message as PylintMessage
from pylint.reporters import BaseReporter

from prospector.message import Location, Message


class Collector(BaseReporter):
    name = "collector"

    def __init__(self, message_store):
        BaseReporter.__init__(self, output=StringIO())
        self._message_store = message_store
        self._messages = []

    def handle_message(self, msg: PylintMessage) -> None:
        loc = Location(msg.abspath, msg.module, msg.obj, msg.line, msg.column)

        # At this point pylint will give us the code but we want the
        # more user-friendly symbol
        try:
            msg_data = self._message_store.get_message_definitions(msg.msg_id)
        except UnknownMessageError:
            # this shouldn't happen, as all pylint errors should be
            # in the message store, but just in case we'll fall back
            # to using the code.
            msg_symbol = msg.msg_id
        else:
            msg_symbol = msg_data[0].symbol

        message = Message("pylint", msg_symbol, loc, msg.msg)
        self._messages.append(message)

    def _display(self, layout) -> None:
        pass

    def get_messages(self) -> List[Message]:
        return self._messages

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