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schema_parser.py
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Wed, May 22, 18:34

schema_parser.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2013 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.,
## 60 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
from pyparsing import Keyword
from invenio.base.utils import try_to_eval
from invenio.modules.jsonalchemy.registry import functions
from invenio.modules.jsonalchemy.parser import FieldBaseExtensionParser, \
DICT_DEF, indentedBlock
class SchemaParser(FieldBaseExtensionParser):
"""
Parses the schema definitions for fields, using cerberus::
modification_date:
schema:
{'modification_date': {'type': 'datetime',
'required': True,
'default': lambda: __import__('datetime').datetime.now()}}
"""
@classmethod
def parse_element(cls, indent_stack):
"""Sets the ``schema`` attribute inside the rule"""
return (Keyword('schema:').suppress() +
indentedBlock(DICT_DEF, indent_stack)
).setParseAction(lambda toks: toks[0])\
.setResultsName('schema')
@classmethod
def create_element(cls, rule, namespace):
"""Just evaluates the content of the schema to a python dictionary"""
return try_to_eval(rule.schema, functions(namespace))
parser = SchemaParser

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