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# -*- coding: utf-8 -*-
# copyright 2016 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr -- mailto:contact@logilab.fr
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option)
# any later version.
#
# This program 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 Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from compiler.ast import flatten
from elasticsearch_dsl import Q
def compose_search(query):
'''
Compose a elasticsearch-dsl query from queries :
* simple term
* simple terms (OR)
* negation (add - in front of a term)
* explicit OR
* quoted terms (AND)
'''
# FIXME TODO - restructure entier code base, have a proper lexer
must = []
must_not = []
should = []
if '"' in query:
elements = flatten([x.split() for x in query.split('"') if x])
elif "'" in query:
elements = flatten([x.split() for x in query.split("'") if x])
else:
elements = query.split()
elements_lowercase = [e.lower() for e in elements]
if 'or' in elements_lowercase and len(elements) >= 3:
for element in query.split('or'):
should.append(Q('multi_match',
query=element.strip(),
fields=()))
elements = []
elif '-' not in query:
elements = [' '.join(elements)]
for element in elements:
if element.startswith('-'):
must_not.append(Q('multi_match',
query=element[1:],
fields=()))
else:
must.append(Q('multi_match',
query=element,
fields=()))
return Q('bool',
must=must,
must_not=must_not,
should=should)