Source code for inspirehep.modules.forms.utils

# -*- coding: utf-8 -*-
#
# This file is part of INSPIRE.
# Copyright (C) 2014-2017 CERN.
#
# INSPIRE is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# INSPIRE is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with INSPIRE. If not, see <http://www.gnu.org/licenses/>.
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# In applying this license, CERN does not waive the privileges and immunities
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"""Forms utilities."""

from __future__ import absolute_import, division, print_function


def filter_empty_helper(keys=None):
    """Remove empty elements from a list."""
    def _inner(elem):
        if isinstance(elem, dict):
            for k, v in elem.items():
                if (keys is None or k in keys) and v:
                    return True
            return False
        else:
            return bool(elem)
    return _inner


def filter_empty_elements(recjson, list_fields):
    """Filter empty fields."""
    for key in list_fields:
        recjson[key] = filter(
            filter_empty_helper(), recjson.get(key, [])
        )

    for k in recjson.keys():
        if not recjson[k]:
            del recjson[k]

    return recjson