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extension_model_parser.py
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Mon, Nov 18, 23:55

extension_model_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, Word, alphanums, delimitedList
from werkzeug.utils import import_string
from invenio.base.utils import try_to_eval
from invenio.modules.jsonalchemy.parser import ModelBaseExtensionParser, \
indentedBlock
class ExtensionModelParser(ModelBaseExtensionParser): # pylint: disable=W0232
"""
Handles the extension section in the model definitions::
fields:
....
extensions:
invenio.modules.records.api:RecordIter
"""
__parsername__ = 'extensions'
@classmethod
def parse_element(cls, indent_stack):
"""Sets ``extensions`` attribute to the rule definition"""
import_str = Word(alphanums + '_' + '.' + ':')
return (Keyword('extensions:').suppress() +
indentedBlock(delimitedList(import_str), indent_stack)
).setResultsName('extensions')
@classmethod
def create_element(cls, rule, namespace): # pylint: disable=W0613
"""Simply returns the list of extensions"""
return rule.extensions.asList()
@classmethod
def inherit_model(cls, current_value, base_value):
"""Extends the list of extensions with the new ones without repeating"""
if current_value is None:
return base_value
elif base_value is None:
return current_value
return list(set(base_value + current_value))
@classmethod
def extend_model(cls, current_value, new_value):
"""Like inherit"""
return cls.inherit_model(current_value, new_value)
@classmethod
def add_info_to_field(cls, info):
"""Adds the list of extensions to the model information"""
return info
@classmethod
def evaluate(cls, obj, args):
"""Extend the incoming object with all the new things from args"""
if args is None:
return
extensions = []
for ext in args:
try:
extensions.append(import_string(ext))
except ImportError:
extensions.append(try_to_eval(ext))
extensions.append(obj.__class__)
obj.__class__ = type(obj.__class__.__name__, tuple(extensions), {})
parser = ExtensionModelParser

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