from core.builtin_concepts import BuiltinConcepts
from parsers.BaseParser import BaseParser
import logging

log = logging.getLogger(__name__)


class EmptyStringParser(BaseParser):
    """
    To parse empty or blank strings
    """

    def __init__(self):
        BaseParser.__init__(self, "NullParser")

    def parse(self, context, text):
        sheerka = context.sheerka

        if isinstance(text, str) and text.strip() == "" or \
            isinstance(text, list) and text == [] or \
            text is None:
            log.debug(f"Recognized '{text}' as BuiltinConcepts.NOP.")
            return sheerka.ret(self.name, True, sheerka.new(BuiltinConcepts.NOP))

        log.debug(f"Failed to recognize '{text}'")
        return sheerka.ret(self.name, False, sheerka.new(BuiltinConcepts.NOT_FOR_ME))