# SPDX-License-Identifier: GPL-3.0-or-later
#
# This file is part of Nominatim. (https://nominatim.org)
#
# Copyright (C) 2024 by the Nominatim developer community.
# For a full list of authors see the git log.
"""
Normalize query test using an ICU transliterator.
"""
from typing import cast

from .config import QueryConfig
from .base import QueryProcessingFunc
from ..search.query import Phrase


def create(config: QueryConfig) -> QueryProcessingFunc:
    normalizer = config.get('_normalizer')

    if not normalizer:
        return lambda p: p

    return lambda phrases: list(
        filter(lambda p: p.text,
               (Phrase(p.ptype, cast(str, normalizer.transliterate(p.text)))
                for p in phrases)))