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only_if_parser.py
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Sat, Feb 22, 01:41

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):
"""
Handles the @only_if decorator::
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):
"""
This is a special case where the real evaluation of the decorator
happened before the evaluation, :see:create_element
"""
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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