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


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

    def __init__(self, **kwargs):
        BaseParser.__init__(self, "EmptyString", 90)

    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:
            ret = sheerka.ret(self.name, True, sheerka.new(
                BuiltinConcepts.PARSER_RESULT,
                parser=self,
                source="",
                body=sheerka.new(BuiltinConcepts.NOP)))
        else:
            ret = sheerka.ret(self.name, False, sheerka.new(BuiltinConcepts.NOT_FOR_ME))

        self.log_result(context, text, ret)
        return ret