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R3600/invenio/modules/jsonalchemy/jsonext/parsers/only_if_parser.py
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only_if_parser.py
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# -*- coding: utf-8 -*-
#
# This file is part of Invenio.
# Copyright (C) 2014 CERN.
#
# Invenio 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 2 of the
# License, or (at your option) any later version.
#
# Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
from pyparsing import Keyword, originalTextFor, nestedExpr
from invenio.base.utils import try_to_eval
from invenio.modules.jsonalchemy.parser import \
DecoratorBeforeEvalBaseExtensionParser
class OnlyIfParser(DecoratorBeforeEvalBaseExtensionParser):
"""
Handle the ``@only_if`` decorator.
.. code-block:: ini
number_of_copies:
creator:
@only_if('BOOK' in self.get('collection.primary', []))
get_number_of_copies(self.get('recid'))
"""
__parsername__ = 'only_if'
@classmethod
def parse_element(cls, indent_stack):
return (Keyword("@only_if").suppress() +
originalTextFor(nestedExpr())
).setResultsName("only_if").setParseAction(lambda toks: toks[0])
@classmethod
def create_element(cls, rule, field_def, content, namespace):
return compile(content, '', 'eval')
@classmethod
def evaluate(cls, reader, args):
"""Evaluate parser.
This is a special case where the real evaluation of the decorator
is happening before the evaluation.
"""
from invenio.modules.jsonalchemy.registry import functions
evaluated = try_to_eval(
args, functions(reader._json.additional_info.namespace),
self=reader._json)
if not isinstance(evaluated, (list, tuple)):
return evaluated
else:
return all(evaluated)
parser = OnlyIfParser
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