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legacy_parser.py
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Mon, Nov 18, 18:24

legacy_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.
import six
from pyparsing import Keyword, originalTextFor, nestedExpr
from invenio.modules.jsonalchemy.parser import FieldParser, \
DecoratorOnEvalBaseExtensionParser
class LegacyParser(DecoratorOnEvalBaseExtensionParser):
"""
Handle the ``@legacy`` decorator.
.. code-block:: ini
doi:
creator:
@legacy((("024", "0247_", "0247_%"), ""),
("0247_a", ""))
marc, "0247_", get_doi(value)
files:
calculated:
@legacy('marc', ("8564_z", "comment"),
("8564_y", "caption", "description"),
("8564_q", "eformat"),
("8564_f", "name"),
("8564_s", "size"),
("8564_u", "url", "url")
)
@parse_first(('recid', ))
{'url': 'http://example.org'}
"""
__parsername__ = 'legacy'
@classmethod
def parse_element(cls, indent_stack):
return (Keyword("@legacy").suppress() +
originalTextFor(nestedExpr("(", ")"))
).setResultsName("legacy", listAllMatches=True)
@classmethod
def create_element(cls, rule, field_def, content, namespace):
"""Special case of decorator.
It creates the legacy rules dictionary and it doesn't have any effect
to the field definitions::
{'100' : ['authors[0]'],
'100__' : ['authors[0]'],
'100__%': ['authors[0]'],
'100__a': ['authors[0].full_name'],
.......
}
"""
if namespace not in FieldParser._legacy_field_matchings:
FieldParser._legacy_field_matchings[namespace] = {}
for legacy_rule in content:
legacy_rule = eval(legacy_rule[0])
if field_def['source_format'] in ('derived', 'calculated'):
inner_source_format = legacy_rule[0]
legacy_rule = legacy_rule[1:]
else:
inner_source_format = field_def['source_format']
if inner_source_format not in \
FieldParser._legacy_field_matchings[namespace]:
FieldParser._legacy_field_matchings[namespace][
inner_source_format] = {}
for field_legacy_rule in legacy_rule:
# Allow string and tuple in the config file
legacy_fields = (field_legacy_rule[0], ) \
if isinstance(field_legacy_rule[0], six.string_types) \
else field_legacy_rule[0]
json_field = rule.field['json_id']
if field_legacy_rule[-1]:
json_field = '.'.join((json_field, field_legacy_rule[-1]))
for legacy_field in legacy_fields:
if legacy_field not in FieldParser._legacy_field_matchings[
namespace][inner_source_format]:
FieldParser._legacy_field_matchings[
namespace][inner_source_format][legacy_field] = []
FieldParser._legacy_field_matchings[
namespace][inner_source_format][legacy_field]\
.append(json_field)
@classmethod
def evaluate(cls, value, namespace, args):
"""Evaluate parser.
This is a special case where the real evaluation of the decorator
happened before the evaluation.
"""
return True
parser = LegacyParser

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