[enh] autocomplete refactoring, autocomplete on external bangs

searx/autocomplete.py

@@ -20,97 +20,20 @@ from lxml import etree
 from json import loads
 from urllib.parse import urlencode
 
+from requests import RequestException
+
 from searx import settings
-from searx.languages import language_codes
-from searx.engines import (
-    categories, engines, engine_shortcuts
-)
 from searx.poolrequests import get as http_get
+from searx.exceptions import SearxEngineResponseException
 
 
 def get(*args, **kwargs):
     if 'timeout' not in kwargs:
         kwargs['timeout'] = settings['outgoing']['request_timeout']
-
+    kwargs['raise_for_httperror'] = True
     return http_get(*args, **kwargs)
 
 
-def searx_bang(full_query):
-    '''check if the searchQuery contain a bang, and create fitting autocompleter results'''
-    # check if there is a query which can be parsed
-    if len(full_query.getQuery()) == 0:
-        return []
-
-    results = []
-
-    # check if current query stats with !bang
-    first_char = full_query.getQuery()[0]
-    if first_char == '!' or first_char == '?':
-        if len(full_query.getQuery()) == 1:
-            # show some example queries
-            # TODO, check if engine is not avaliable
-            results.append(first_char + "images")
-            results.append(first_char + "wikipedia")
-            results.append(first_char + "osm")
-        else:
-            engine_query = full_query.getQuery()[1:]
-
-            # check if query starts with categorie name
-            for categorie in categories:
-                if categorie.startswith(engine_query):
-                    results.append(first_char + '{categorie}'.format(categorie=categorie))
-
-            # check if query starts with engine name
-            for engine in engines:
-                if engine.startswith(engine_query.replace('_', ' ')):
-                    results.append(first_char + '{engine}'.format(engine=engine.replace(' ', '_')))
-
-            # check if query starts with engine shortcut
-            for engine_shortcut in engine_shortcuts:
-                if engine_shortcut.startswith(engine_query):
-                    results.append(first_char + '{engine_shortcut}'.format(engine_shortcut=engine_shortcut))
-
-    # check if current query stats with :bang
-    elif first_char == ':':
-        if len(full_query.getQuery()) == 1:
-            # show some example queries
-            results.append(":en")
-            results.append(":en_us")
-            results.append(":english")
-            results.append(":united_kingdom")
-        else:
-            engine_query = full_query.getQuery()[1:]
-
-            for lc in language_codes:
-                lang_id, lang_name, country, english_name = map(str.lower, lc)
-
-                # check if query starts with language-id
-                if lang_id.startswith(engine_query):
-                    if len(engine_query) <= 2:
-                        results.append(':{lang_id}'.format(lang_id=lang_id.split('-')[0]))
-                    else:
-                        results.append(':{lang_id}'.format(lang_id=lang_id))
-
-                # check if query starts with language name
-                if lang_name.startswith(engine_query) or english_name.startswith(engine_query):
-                    results.append(':{lang_name}'.format(lang_name=lang_name))
-
-                # check if query starts with country
-                if country.startswith(engine_query.replace('_', ' ')):
-                    results.append(':{country}'.format(country=country.replace(' ', '_')))
-
-    # remove duplicates
-    result_set = set(results)
-
-    # remove results which are already contained in the query
-    for query_part in full_query.query_parts:
-        if query_part in result_set:
-            result_set.remove(query_part)
-
-    # convert result_set back to list
-    return list(result_set)
-
-
 def dbpedia(query, lang):
     # dbpedia autocompleter, no HTTPS
     autocomplete_url = 'https://lookup.dbpedia.org/api/search.asmx/KeywordSearch?'
@@ -204,3 +127,14 @@ backends = {'dbpedia': dbpedia,
             'qwant': qwant,
             'wikipedia': wikipedia
             }
+
+
+def search_autocomplete(backend_name, query, lang):
+    backend = backends.get(backend_name)
+    if backend is None:
+        return []
+
+    try:
+        return backend(query, lang)
+    except (RequestException, SearxEngineResponseException):
+        return []

searx/query.py

@@ -1,85 +1,88 @@
-#!/usr/bin/env python
+# SPDX-License-Identifier: AGPL-3.0-or-later
-
-'''
-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 abc import abstractmethod, ABC
 import re
 
 from searx.languages import language_codes
 from searx.engines import categories, engines, engine_shortcuts
+from searx.external_bang import get_bang_definition_and_autocomplete
 from searx.search import EngineRef
 from searx.webutils import VALID_LANGUAGE_CODE
 
 
-class RawTextQuery:
+class QueryPartParser(ABC):
-    """parse raw text query (the value from the html input)"""
 
-    def __init__(self, query, disabled_engines):
+    __slots__ = "raw_text_query", "enable_autocomplete"
-        assert isinstance(query, str)
-        self.query = query
-        self.disabled_engines = []
 
-        if disabled_engines:
+    @staticmethod
-            self.disabled_engines = disabled_engines
+    @abstractmethod
+    def check(raw_value):
+        """Check if raw_value can be parsed"""
 
-        self.query_parts = []
+    def __init__(self, raw_text_query, enable_autocomplete):
-        self.user_query_parts = []
+        self.raw_text_query = raw_text_query
-        self.enginerefs = []
+        self.enable_autocomplete = enable_autocomplete
-        self.languages = []
-        self.timeout_limit = None
-        self.external_bang = None
-        self.specific = False
-        self._parse_query()
 
-    # parse query, if tags are set, which
+    @abstractmethod
-    # change the search engine or search-language
+    def __call__(self, raw_value):
-    def _parse_query(self):
+        """Try to parse raw_value: set the self.raw_text_query properties
-        self.query_parts = []
 
-        # split query, including whitespaces
+        return True if raw_value has been parsed
-        raw_query_parts = re.split(r'(\s+)', self.query)
 
-        for query_part in raw_query_parts:
+        self.raw_text_query.autocomplete_list is also modified
-            searx_query_part = False
+        if self.enable_autocomplete is True
+        """
 
-            # part does only contain spaces, skip
+    def _add_autocomplete(self, value):
-            if query_part.isspace()\
+        if value not in self.raw_text_query.autocomplete_list:
-               or query_part == '':
+            self.raw_text_query.autocomplete_list.append(value)
-                continue
 
-            # this force the timeout
+
-            if query_part[0] == '<':
+class TimeoutParser(QueryPartParser):
-                try:
+
-                    raw_timeout_limit = int(query_part[1:])
+    @staticmethod
+    def check(raw_value):
+        return raw_value[0] == '<'
+
+    def __call__(self, raw_value):
+        value = raw_value[1:]
+        found = self._parse(value) if len(value) > 0 else False
+        if self.enable_autocomplete and not value:
+            self._autocomplete()
+        return found
+
+    def _parse(self, value):
+        if not value.isdigit():
+            return False
+        raw_timeout_limit = int(value)
         if raw_timeout_limit < 100:
             # below 100, the unit is the second ( <3 = 3 seconds timeout )
-                        self.timeout_limit = float(raw_timeout_limit)
+            self.raw_text_query.timeout_limit = float(raw_timeout_limit)
         else:
             # 100 or above, the unit is the millisecond ( <850 = 850 milliseconds timeout )
-                        self.timeout_limit = raw_timeout_limit / 1000.0
+            self.raw_text_query.timeout_limit = raw_timeout_limit / 1000.0
-                    searx_query_part = True
+        return True
-                except ValueError:
-                    # error not reported to the user
-                    pass
 
-            # this force a language
+    def _autocomplete(self):
-            if query_part[0] == ':' and len(query_part) > 1:
+        for suggestion in ['<3', '<850']:
-                lang = query_part[1:].lower().replace('_', '-')
+            self._add_autocomplete(suggestion)
 
+
+class LanguageParser(QueryPartParser):
+
+    @staticmethod
+    def check(raw_value):
+        return raw_value[0] == ':'
+
+    def __call__(self, raw_value):
+        value = raw_value[1:].lower().replace('_', '-')
+        found = self._parse(value) if len(value) > 0 else False
+        if self.enable_autocomplete and not found:
+            self._autocomplete(value)
+        return found
+
+    def _parse(self, value):
+        found = False
         # check if any language-code is equal with
         # declared language-codes
         for lc in language_codes:
@@ -87,76 +90,241 @@ class RawTextQuery:
 
             # if correct language-code is found
             # set it as new search-language
-                    if (lang == lang_id
+
-                        or lang == lang_name
+            if (value == lang_id
-                        or lang == english_name
+                or value == lang_name
-                        or lang.replace('-', ' ') == country)\
+                or value == english_name
-                       and lang not in self.languages:
+                or value.replace('-', ' ') == country)\
-                        searx_query_part = True
+               and value not in self.raw_text_query.languages:
+                found = True
                 lang_parts = lang_id.split('-')
                 if len(lang_parts) == 2:
-                            self.languages.append(lang_parts[0] + '-' + lang_parts[1].upper())
+                    self.raw_text_query.languages.append(lang_parts[0] + '-' + lang_parts[1].upper())
                 else:
-                            self.languages.append(lang_id)
+                    self.raw_text_query.languages.append(lang_id)
                 # to ensure best match (first match is not necessarily the best one)
-                        if lang == lang_id:
+                if value == lang_id:
                     break
 
         # user may set a valid, yet not selectable language
-                if VALID_LANGUAGE_CODE.match(lang):
+        if VALID_LANGUAGE_CODE.match(value):
-                    lang_parts = lang.split('-')
+            lang_parts = value.split('-')
             if len(lang_parts) > 1:
-                        lang = lang_parts[0].lower() + '-' + lang_parts[1].upper()
+                value = lang_parts[0].lower() + '-' + lang_parts[1].upper()
-                    if lang not in self.languages:
+            if value not in self.raw_text_query.languages:
-                        self.languages.append(lang)
+                self.raw_text_query.languages.append(value)
-                        searx_query_part = True
+                found = True
 
-            # external bang
+        return found
-            if query_part[0:2] == "!!":
-                self.external_bang = query_part[2:]
-                searx_query_part = True
-                continue
-            # this force a engine or category
-            if query_part[0] == '!' or query_part[0] == '?':
-                prefix = query_part[1:].replace('-', ' ').replace('_', ' ')
 
+    def _autocomplete(self, value):
+        if not value:
+            # show some example queries
+            for lang in [":en", ":en_us", ":english", ":united_kingdom"]:
+                self.raw_text_query.autocomplete_list.append(lang)
+            return
+
+        for lc in language_codes:
+            lang_id, lang_name, country, english_name = map(str.lower, lc)
+
+            # check if query starts with language-id
+            if lang_id.startswith(value):
+                if len(value) <= 2:
+                    self._add_autocomplete(':' + lang_id.split('-')[0])
+                else:
+                    self._add_autocomplete(':' + lang_id)
+
+            # check if query starts with language name
+            if lang_name.startswith(value) or english_name.startswith(value):
+                self._add_autocomplete(':' + lang_name)
+
+            # check if query starts with country
+            # here "new_zealand" is "new-zealand" (see __call__)
+            if country.startswith(value.replace('-', ' ')):
+                self._add_autocomplete(':' + country.replace(' ', '_'))
+
+
+class ExternalBangParser(QueryPartParser):
+
+    @staticmethod
+    def check(raw_value):
+        return raw_value.startswith('!!')
+
+    def __call__(self, raw_value):
+        value = raw_value[2:]
+        found, bang_ac_list = self._parse(value) if len(value) > 0 else (False, [])
+        if self.enable_autocomplete:
+            self._autocomplete(bang_ac_list)
+        return found
+
+    def _parse(self, value):
+        found = False
+        bang_definition, bang_ac_list = get_bang_definition_and_autocomplete(value)
+        if bang_definition is not None:
+            self.raw_text_query.external_bang = value
+            found = True
+        return found, bang_ac_list
+
+    def _autocomplete(self, bang_ac_list):
+        if not bang_ac_list:
+            bang_ac_list = ['g', 'ddg', 'bing']
+        for external_bang in bang_ac_list:
+            self._add_autocomplete('!!' + external_bang)
+
+
+class BangParser(QueryPartParser):
+
+    @staticmethod
+    def check(raw_value):
+        return raw_value[0] == '!' or raw_value[0] == '?'
+
+    def __call__(self, raw_value):
+        value = raw_value[1:].replace('-', ' ').replace('_', ' ')
+        found = self._parse(value) if len(value) > 0 else False
+        if found and raw_value[0] == '!':
+            self.raw_text_query.specific = True
+        if self.enable_autocomplete:
+            self._autocomplete(raw_value[0], value)
+        return found
+
+    def _parse(self, value):
         # check if prefix is equal with engine shortcut
-                if prefix in engine_shortcuts:
+        if value in engine_shortcuts:
-                    searx_query_part = True
+            value = engine_shortcuts[value]
-                    engine_name = engine_shortcuts[prefix]
-                    if engine_name in engines:
-                        self.enginerefs.append(EngineRef(engine_name, 'none'))
 
         # check if prefix is equal with engine name
-                elif prefix in engines:
+        if value in engines:
-                    searx_query_part = True
+            self.raw_text_query.enginerefs.append(EngineRef(value, 'none'))
-                    self.enginerefs.append(EngineRef(prefix, 'none'))
+            return True
 
         # check if prefix is equal with categorie name
-                elif prefix in categories:
+        if value in categories:
             # using all engines for that search, which
             # are declared under that categorie name
-                    searx_query_part = True
+            self.raw_text_query.enginerefs.extend(EngineRef(engine.name, value)
-                    self.enginerefs.extend(EngineRef(engine.name, prefix)
+                                                  for engine in categories[value]
-                                           for engine in categories[prefix]
+                                                  if (engine.name, value) not in self.raw_text_query.disabled_engines)
-                                           if (engine.name, prefix) not in self.disabled_engines)
+            return True
 
-            if query_part[0] == '!':
+        return False
-                self.specific = True
+
+    def _autocomplete(self, first_char, value):
+        if not value:
+            # show some example queries
+            for suggestion in ['images', 'wikipedia', 'osm']:
+                if suggestion not in self.raw_text_query.disabled_engines or suggestion in categories:
+                    self._add_autocomplete(first_char + suggestion)
+            return
+
+        # check if query starts with categorie name
+        for category in categories:
+            if category.startswith(value):
+                self._add_autocomplete(first_char + category)
+
+        # check if query starts with engine name
+        for engine in engines:
+            if engine.startswith(value):
+                self._add_autocomplete(first_char + engine.replace(' ', '_'))
+
+        # check if query starts with engine shortcut
+        for engine_shortcut in engine_shortcuts:
+            if engine_shortcut.startswith(value):
+                self._add_autocomplete(first_char + engine_shortcut)
+
+
+class RawTextQuery:
+    """parse raw text query (the value from the html input)"""
+
+    PARSER_CLASSES = [
+        TimeoutParser,  # this force the timeout
+        LanguageParser,  # this force a language
+        ExternalBangParser,  # external bang (must be before BangParser)
+        BangParser  # this force a engine or category
+    ]
+
+    def __init__(self, query, disabled_engines):
+        assert isinstance(query, str)
+        # input parameters
+        self.query = query
+        self.disabled_engines = disabled_engines if disabled_engines else []
+        # parsed values
+        self.enginerefs = []
+        self.languages = []
+        self.timeout_limit = None
+        self.external_bang = None
+        self.specific = False
+        self.autocomplete_list = []
+        # internal properties
+        self.query_parts = []  # use self.getFullQuery()
+        self.user_query_parts = []  # use self.getQuery()
+        self.autocomplete_location = None
+        self._parse_query()
+
+    def _parse_query(self):
+        """
+        parse self.query, if tags are set, which
+        change the search engine or search-language
+        """
+
+        # split query, including whitespaces
+        raw_query_parts = re.split(r'(\s+)', self.query)
+
+        last_index_location = None
+        autocomplete_index = len(raw_query_parts) - 1
+
+        for i, query_part in enumerate(raw_query_parts):
+            # part does only contain spaces, skip
+            if query_part.isspace()\
+               or query_part == '':
+                continue
+
+            # parse special commands
+            special_part = False
+            for parser_class in RawTextQuery.PARSER_CLASSES:
+                if parser_class.check(query_part):
+                    special_part = parser_class(self, i == autocomplete_index)(query_part)
+                    break
 
             # append query part to query_part list
-            if searx_query_part:
+            qlist = self.query_parts if special_part else self.user_query_parts
-                self.query_parts.append(query_part)
+            qlist.append(query_part)
-            else:
+            last_index_location = (qlist, len(qlist) - 1)
-                self.user_query_parts.append(query_part)
+
+        self.autocomplete_location = last_index_location
+
+    def get_autocomplete_full_query(self, text):
+        qlist, position = self.autocomplete_location
+        qlist[position] = text
+        return self.getFullQuery()
 
     def changeQuery(self, query):
         self.user_query_parts = query.strip().split()
+        self.query = self.getFullQuery()
+        self.autocomplete_location = (self.user_query_parts, len(self.user_query_parts) - 1)
+        self.autocomplete_list = []
         return self
 
     def getQuery(self):
         return ' '.join(self.user_query_parts)
 
     def getFullQuery(self):
-        # get full querry including whitespaces
+        """
-        return '{0} {1}'.format(''.join(self.query_parts), self.getQuery()).strip()
+        get full querry including whitespaces
+        """
+        return '{0} {1}'.format(' '.join(self.query_parts), self.getQuery()).strip()
+
+    def __str__(self):
+        return self.getFullQuery()
+
+    def __repr__(self):
+        return f"<{self.__class__.__name__} " \
+               + f"query={self.query!r} " \
+               + f"disabled_engines={self.disabled_engines!r}\n  " \
+               + f"languages={self.languages!r} " \
+               + f"timeout_limit={self.timeout_limit!r} "\
+               + f"external_bang={self.external_bang!r} " \
+               + f"specific={self.specific!r} " \
+               + f"enginerefs={self.enginerefs!r}\n  " \
+               + f"autocomplete_list={self.autocomplete_list!r}\n  " \
+               + f"query_parts={self.query_parts!r}\n  " \
+               + f"user_query_parts={self.user_query_parts!r} >"

searx/webapp.py

@@ -74,12 +74,13 @@ from searx.languages import language_codes as languages
 from searx.search import SearchWithPlugins, initialize as search_initialize
 from searx.search.checker import get_result as checker_get_result
 from searx.query import RawTextQuery
-from searx.autocomplete import searx_bang, backends as autocomplete_backends
+from searx.autocomplete import search_autocomplete, backends as autocomplete_backends
 from searx.plugins import plugins
 from searx.plugins.oa_doi_rewrite import get_doi_resolver
 from searx.preferences import Preferences, ValidationException, LANGUAGE_CODES
 from searx.answerers import answerers
 from searx.poolrequests import get_global_proxies
+from searx.answerers import ask
 from searx.metrology.error_recorder import errors_per_engines
 
 # serve pages with HTTP/1.1
@@ -763,27 +764,18 @@ def about():
 def autocompleter():
     """Return autocompleter results"""
 
+    # run autocompleter
+    results = []
+
     # set blocked engines
     disabled_engines = request.preferences.engines.get_disabled()
 
     # parse query
     raw_text_query = RawTextQuery(request.form.get('q', ''), disabled_engines)
 
-    # check if search query is set
-    if not raw_text_query.getQuery():
-        return '', 400
-
-    # run autocompleter
-    completer = autocomplete_backends.get(request.preferences.get_value('autocomplete'))
-
-    # parse searx specific autocompleter results like !bang
-    raw_results = searx_bang(raw_text_query)
-
     # normal autocompletion results only appear if no inner results returned
-    # and there is a query part besides the engine and language bangs
+    # and there is a query part
-    if len(raw_results) == 0 and completer and (len(raw_text_query.query_parts) > 1 or
+    if len(raw_text_query.autocomplete_list) == 0 and len(raw_text_query.getQuery()) > 0:
-                                                (len(raw_text_query.languages) == 0 and
-                                                 not raw_text_query.specific)):
         # get language from cookie
         language = request.preferences.get_value('language')
         if not language or language == 'all':
@@ -791,15 +783,18 @@ def autocompleter():
         else:
             language = language.split('-')[0]
         # run autocompletion
-        raw_results.extend(completer(raw_text_query.getQuery(), language))
+        raw_results = search_autocomplete(request.preferences.get_value('autocomplete'),
-
+                                          raw_text_query.getQuery(), language)
-    # parse results (write :language and !engine back to result string)
-    results = []
         for result in raw_results:
-        raw_text_query.changeQuery(result)
+            results.append(raw_text_query.changeQuery(result).getFullQuery())
 
-        # add parsed result
+    if len(raw_text_query.autocomplete_list) > 0:
-        results.append(raw_text_query.getFullQuery())
+        for autocomplete_text in raw_text_query.autocomplete_list:
+            results.append(raw_text_query.get_autocomplete_full_query(autocomplete_text))
+
+    for answers in ask(raw_text_query):
+        for answer in answers:
+            results.append(str(answer['answer']))
 
     # return autocompleter results
     if request.headers.get('X-Requested-With') == 'XMLHttpRequest':

tests/unit/test_query.py

@@ -1,7 +1,20 @@
+from searx.search import initialize
 from searx.query import RawTextQuery
 from searx.testing import SearxTestCase
 
 
+TEST_ENGINES = [
+    {
+        'name': 'dummy engine',
+        'engine': 'dummy',
+        'categories': 'general',
+        'shortcut': 'du',
+        'timeout': 3.0,
+        'tokens': [],
+    },
+]
+
+
 class TestQuery(SearxTestCase):
 
     def test_simple_query(self):
@@ -14,6 +27,37 @@ class TestQuery(SearxTestCase):
         self.assertEqual(len(query.languages), 0)
         self.assertFalse(query.specific)
 
+    def test_multiple_spaces_query(self):
+        query_text = '\tthe   query'
+        query = RawTextQuery(query_text, [])
+
+        self.assertEqual(query.getFullQuery(), 'the query')
+        self.assertEqual(len(query.query_parts), 0)
+        self.assertEqual(len(query.user_query_parts), 2)
+        self.assertEqual(len(query.languages), 0)
+        self.assertFalse(query.specific)
+
+    def test_str_method(self):
+        query_text = '<7 the query'
+        query = RawTextQuery(query_text, [])
+        self.assertEqual(str(query), '<7 the query')
+
+    def test_repr_method(self):
+        query_text = '<8 the query'
+        query = RawTextQuery(query_text, [])
+        r = repr(query)
+        self.assertTrue(r.startswith(f"<RawTextQuery query='{query_text}' "))
+
+    def test_change_query(self):
+        query_text = '<8 the query'
+        query = RawTextQuery(query_text, [])
+        another_query = query.changeQuery('another text')
+        self.assertEqual(query, another_query)
+        self.assertEqual(query.getFullQuery(), '<8 another text')
+
+
+class TestLanguageParser(SearxTestCase):
+
     def test_language_code(self):
         language = 'es-ES'
         query_text = 'the query'
@@ -68,6 +112,30 @@ class TestQuery(SearxTestCase):
         self.assertEqual(len(query.languages), 0)
         self.assertFalse(query.specific)
 
+    def test_autocomplete_empty(self):
+        query_text = 'the query :'
+        query = RawTextQuery(query_text, [])
+        self.assertEqual(query.autocomplete_list, [":en", ":en_us", ":english", ":united_kingdom"])
+
+    def test_autocomplete(self):
+        query = RawTextQuery(':englis', [])
+        self.assertEqual(query.autocomplete_list, [":english"])
+
+        query = RawTextQuery(':deutschla', [])
+        self.assertEqual(query.autocomplete_list, [":deutschland"])
+
+        query = RawTextQuery(':new_zea', [])
+        self.assertEqual(query.autocomplete_list, [":new_zealand"])
+
+        query = RawTextQuery(':hu-H', [])
+        self.assertEqual(query.autocomplete_list, [":hu-hu"])
+
+        query = RawTextQuery(':v', [])
+        self.assertEqual(query.autocomplete_list, [":vi", ":tiếng việt"])
+
+
+class TestTimeoutParser(SearxTestCase):
+
     def test_timeout_below100(self):
         query_text = '<3 the query'
         query = RawTextQuery(query_text, [])
@@ -105,3 +173,113 @@ class TestQuery(SearxTestCase):
         self.assertEqual(query.getQuery(), query_text)
         self.assertEqual(query.timeout_limit, None)
         self.assertFalse(query.specific)
+
+    def test_timeout_autocomplete(self):
+        # invalid number: it is not bang but it is part of the query
+        query_text = 'the query <'
+        query = RawTextQuery(query_text, [])
+
+        self.assertEqual(query.getFullQuery(), query_text)
+        self.assertEqual(len(query.query_parts), 0)
+        self.assertEqual(query.getQuery(), query_text)
+        self.assertEqual(query.timeout_limit, None)
+        self.assertFalse(query.specific)
+        self.assertEqual(query.autocomplete_list, ['<3', '<850'])
+
+
+class TestExternalBangParser(SearxTestCase):
+
+    def test_external_bang(self):
+        query_text = '!!ddg the query'
+        query = RawTextQuery(query_text, [])
+
+        self.assertEqual(query.getFullQuery(), query_text)
+        self.assertEqual(len(query.query_parts), 1)
+        self.assertFalse(query.specific)
+
+    def test_external_bang_not_found(self):
+        query_text = '!!notfoundbang the query'
+        query = RawTextQuery(query_text, [])
+
+        self.assertEqual(query.getFullQuery(), query_text)
+        self.assertEqual(query.external_bang, None)
+        self.assertFalse(query.specific)
+
+    def test_external_bang_autocomplete(self):
+        query_text = 'the query !!dd'
+        query = RawTextQuery(query_text, [])
+
+        self.assertEqual(query.getFullQuery(), '!!dd the query')
+        self.assertEqual(len(query.query_parts), 1)
+        self.assertFalse(query.specific)
+        self.assertGreater(len(query.autocomplete_list), 0)
+
+        a = query.autocomplete_list[0]
+        self.assertEqual(query.get_autocomplete_full_query(a), a + ' the query')
+
+    def test_external_bang_autocomplete_empty(self):
+        query_text = 'the query !!'
+        query = RawTextQuery(query_text, [])
+
+        self.assertEqual(query.getFullQuery(), 'the query !!')
+        self.assertEqual(len(query.query_parts), 0)
+        self.assertFalse(query.specific)
+        self.assertGreater(len(query.autocomplete_list), 2)
+
+        a = query.autocomplete_list[0]
+        self.assertEqual(query.get_autocomplete_full_query(a), 'the query ' + a)
+
+
+class TestBang(SearxTestCase):
+
+    SPECIFIC_BANGS = ['!dummy_engine', '!du', '!general']
+    NOT_SPECIFIC_BANGS = ['?dummy_engine', '?du', '?general']
+    THE_QUERY = 'the query'
+
+    def test_bang(self):
+        initialize(TEST_ENGINES)
+
+        for bang in TestBang.SPECIFIC_BANGS + TestBang.NOT_SPECIFIC_BANGS:
+            with self.subTest(msg="Check bang", bang=bang):
+                query_text = TestBang.THE_QUERY + ' ' + bang
+                query = RawTextQuery(query_text, [])
+
+                self.assertEqual(query.getFullQuery(), bang + ' ' + TestBang.THE_QUERY)
+                self.assertEqual(query.query_parts, [bang])
+                self.assertEqual(query.user_query_parts, TestBang.THE_QUERY.split(' '))
+
+    def test_specific(self):
+        for bang in TestBang.SPECIFIC_BANGS:
+            with self.subTest(msg="Check bang is specific", bang=bang):
+                query_text = TestBang.THE_QUERY + ' ' + bang
+                query = RawTextQuery(query_text, [])
+                self.assertTrue(query.specific)
+
+    def test_not_specific(self):
+        for bang in TestBang.NOT_SPECIFIC_BANGS:
+            with self.subTest(msg="Check bang is not specific", bang=bang):
+                query_text = TestBang.THE_QUERY + ' ' + bang
+                query = RawTextQuery(query_text, [])
+                self.assertFalse(query.specific)
+
+    def test_bang_not_found(self):
+        initialize(TEST_ENGINES)
+        query = RawTextQuery('the query !bang_not_found', [])
+        self.assertEqual(query.getFullQuery(), 'the query !bang_not_found')
+
+    def test_bang_autocomplete(self):
+        initialize(TEST_ENGINES)
+        query = RawTextQuery('the query !dum', [])
+        self.assertEqual(query.autocomplete_list, ['!dummy_engine'])
+
+        query = RawTextQuery('!dum the query', [])
+        self.assertEqual(query.autocomplete_list, [])
+        self.assertEqual(query.getQuery(), '!dum the query')
+
+    def test_bang_autocomplete_empty(self):
+        initialize()
+        query = RawTextQuery('the query !', [])
+        self.assertEqual(query.autocomplete_list, ['!images', '!wikipedia', '!osm'])
+
+        query = RawTextQuery('the query ?', ['osm'])
+        self.assertEqual(query.autocomplete_list, ['?images', '?wikipedia'])