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depends_on_parser.py
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Sat, Feb 22, 05:08

depends_on_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, Literal, delimitedList, quotedString, \
removeQuotes
from invenio.modules.jsonalchemy.parser import \
DecoratorBeforeEvalBaseExtensionParser
class DependsOnParser(DecoratorBeforeEvalBaseExtensionParser):
"""
Handles the @depends_on decorator::
authors:
derived:
@depends_on('creators', 'contributors')
self.get_list('creators') + self.get_list(contributors)
"""
__parsername__ = 'depends_on'
@classmethod
def parse_element(cls, indent_stack):
return (Keyword("@depends_on").suppress() + \
Literal('(').suppress() +
delimitedList(quotedString.setParseAction(removeQuotes)) +
Literal(')').suppress()
).setResultsName("depends_on")
@classmethod
def create_element(cls, rule, field_def, content, namespace):
"""Just returns the list with the field names"""
return content.asList()
@classmethod
def evaluate(cls, reader, args):
"""
Tries to apply the rules for each field, if it fails on one of them
returns False
"""
for key in args:
if key in reader._json:
continue
if not reader._unpack_rule(key):
return False
return True
parser = DependsOnParser

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