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Merge pull request #106 from pointhi/query_parser

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FIX: #101 implement query parser and use it inside autocompletion and search query extraction
This commit is contained in:
Adam Tauber 2014-10-01 18:24:58 +02:00
commit 983339bb03
3 changed files with 164 additions and 58 deletions
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127
searx/query.py Normal file
View file

@ -0,0 +1,127 @@
#!/usr/bin/env python
'''
searx is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
searx 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 Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with searx. If not, see < http://www.gnu.org/licenses/ >.
(C) 2014 by Thomas Pointhuber, <thomas.pointhuber@gmx.at>
'''
from searx.languages import language_codes
from searx.engines import (
categories, engines, engine_shortcuts
)
import string
import re
class Query(object):
"""parse query"""
def __init__(self, query, blocked_engines):
self.query = query
self.blocked_engines = []
if blocked_engines:
self.blocked_engines = blocked_engines
self.query_parts = []
self.engines = []
self.languages = []
# parse query, if tags are set, which change the serch engine or search-language
def parse_query(self):
self.query_parts = []
# split query, including whitespaces
raw_query_parts = re.split(r'(\s+)', self.query)
parse_next = True
for query_part in raw_query_parts:
if not parse_next:
self.query_parts[-1] += query_part
continue
parse_next = False
# part does only contain spaces, skip
if query_part.isspace()\
or query_part == '':
parse_next = True
self.query_parts.append(query_part)
continue
# this force a language
if query_part[0] == ':':
lang = query_part[1:].lower()
# check if any language-code is equal with declared language-codes
for lc in language_codes:
lang_id, lang_name, country = map(str.lower, lc)
# if correct language-code is found, set it as new search-language
if lang == lang_id\
or lang_id.startswith(lang)\
or lang == lang_name\
or lang == country:
parse_next = True
self.languages.append(lang)
break
# this force a engine or category
if query_part[0] == '!':
prefix = query_part[1:].replace('_', ' ')
# check if prefix is equal with engine shortcut
if prefix in engine_shortcuts\
and not engine_shortcuts[prefix] in self.blocked_engines:
parse_next = True
self.engines.append({'category': 'none',
'name': engine_shortcuts[prefix]})
# check if prefix is equal with engine name
elif prefix in engines\
and not prefix in self.blocked_engines:
parse_next = True
self.engines.append({'category': 'none',
'name': prefix})
# check if prefix is equal with categorie name
elif prefix in categories:
# using all engines for that search, which are declared under that categorie name
parse_next = True
self.engines.extend({'category': prefix,
'name': engine.name}
for engine in categories[prefix]
if not engine in self.blocked_engines)
# append query part to query_part list
self.query_parts.append(query_part)
def changeSearchQuery(self, search_query):
if len(self.query_parts):
self.query_parts[-1] = search_query
else:
self.query_parts.append(search_query)
def getSearchQuery(self):
if len(self.query_parts):
return self.query_parts[-1]
else:
return ''
def getFullQuery(self):
# get full querry including whitespaces
return string.join(self.query_parts, '')

65
searx/search.py
View file

@ -25,6 +25,7 @@ from searx.engines import (
)
from searx.languages import language_codes
from searx.utils import gen_useragent
from searx.query import Query
number_of_searches = 0
@ -235,7 +236,15 @@ class Search(object):
self.pageno = int(pageno_param)
# parse query, if tags are set, which change the serch engine or search-language
self.parse_query()
query_obj = Query(self.query, self.blocked_engines)
query_obj.parse_query()
# get last selected language in query, if possible
# TODO support search with multible languages
if len(query_obj.languages):
self.lang = query_obj.languages[-1]
self.engines = query_obj.engines
self.categories = []
@ -276,60 +285,6 @@ class Search(object):
for x in categories[categ]
if not x.name in self.blocked_engines)
# parse query, if tags are set, which change the serch engine or search-language
def parse_query(self):
query_parts = self.query.split()
modified = False
# check if language-prefix is set
if query_parts[0].startswith(':'):
lang = query_parts[0][1:].lower()
# check if any language-code is equal with declared language-codes
for lc in language_codes:
lang_id, lang_name, country = map(str.lower, lc)
# if correct language-code is found, set it as new search-language
if lang == lang_id\
or lang_id.startswith(lang)\
or lang == lang_name\
or lang == country:
self.lang = lang
modified = True
break
# check if category/engine prefix is set
elif query_parts[0].startswith('!'):
prefix = query_parts[0][1:].replace('_', ' ')
# check if prefix is equal with engine shortcut
if prefix in engine_shortcuts\
and not engine_shortcuts[prefix] in self.blocked_engines:
modified = True
self.engines.append({'category': 'none',
'name': engine_shortcuts[prefix]})
# check if prefix is equal with engine name
elif prefix in engines\
and not prefix in self.blocked_engines:
modified = True
self.engines.append({'category': 'none',
'name': prefix})
# check if prefix is equal with categorie name
elif prefix in categories:
modified = True
# using all engines for that search, which are declared under that categorie name
self.engines.extend({'category': prefix,
'name': engine.name}
for engine in categories[prefix]
if not engine in self.blocked_engines)
# if language, category or engine were specificed in this query, search for more tags which does the same
if modified:
self.query = self.query.replace(query_parts[0], '', 1).strip()
self.parse_query()
# do search-request
def search(self, request):
global number_of_searches

30
searx/webapp.py
View file

@ -47,6 +47,7 @@ from searx.utils import (
from searx.https_rewrite import https_rules
from searx.languages import language_codes
from searx.search import Search
from searx.query import Query
from searx.autocomplete import backends as autocomplete_backends
@ -308,23 +309,46 @@ def autocompleter():
"""Return autocompleter results"""
request_data = {}
# select request method
if request.method == 'POST':
request_data = request.form
else:
request_data = request.args
query = request_data.get('q', '').encode('utf-8')
# set blocked engines
if request.cookies.get('blocked_engines'):
blocked_engines = request.cookies['blocked_engines'].split(',') # noqa
else:
blocked_engines = []
if not query:
# parse query
query = Query(request_data.get('q', '').encode('utf-8'), blocked_engines)
query.parse_query()
# check if search query is set
if not query.getSearchQuery():
return
# run autocompleter
completer = autocomplete_backends.get(request.cookies.get('autocomplete'))
# check if valid autocompleter is selected
if not completer:
return
results = completer(query)
# run autocompletion
raw_results = completer(query.getSearchQuery())
# parse results (write :language and !engine back to result string)
results = []
for result in raw_results:
result_query = query
result_query.changeSearchQuery(result)
# add parsed result
results.append(result_query.getFullQuery())
# return autocompleter results
if request_data.get('format') == 'x-suggestions':
return Response(json.dumps([query, results]),
mimetype='application/json')