# SPDX-License-Identifier: AGPL-3.0-or-later
from abc import abstractmethod, ABC
import re
from searx import settings
from searx.sxng_locales import sxng_locales
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 QueryPartParser(ABC):
__slots__ = "raw_text_query", "enable_autocomplete"
@staticmethod
@abstractmethod
def check(raw_value):
"""Check if raw_value can be parsed"""
def __init__(self, raw_text_query, enable_autocomplete):
self.raw_text_query = raw_text_query
self.enable_autocomplete = enable_autocomplete
@abstractmethod
def __call__(self, raw_value):
"""Try to parse raw_value: set the self.raw_text_query properties
return True if raw_value has been parsed
self.raw_text_query.autocomplete_list is also modified
if self.enable_autocomplete is True
"""
def _add_autocomplete(self, value):
if value not in self.raw_text_query.autocomplete_list:
self.raw_text_query.autocomplete_list.append(value)
class TimeoutParser(QueryPartParser):
@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.raw_text_query.timeout_limit = float(raw_timeout_limit)
else:
# 100 or above, the unit is the millisecond ( <850 = 850 milliseconds timeout )
self.raw_text_query.timeout_limit = raw_timeout_limit / 1000.0
return True
def _autocomplete(self):
for suggestion in ['<3', '<850']:
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 sxng_locales:
lang_id, lang_name, country, english_name, _flag = map(str.lower, lc)
# if correct language-code is found
# set it as new search-language
if (
value == lang_id or value == lang_name or value == english_name or value.replace('-', ' ') == country
) and value not in self.raw_text_query.languages:
found = True
lang_parts = lang_id.split('-')
if len(lang_parts) == 2:
self.raw_text_query.languages.append(lang_parts[0] + '-' + lang_parts[1].upper())
else:
self.raw_text_query.languages.append(lang_id)
# to ensure best match (first match is not necessarily the best one)
if value == lang_id:
break
# user may set a valid, yet not selectable language
if VALID_LANGUAGE_CODE.match(value) or value == 'auto':
lang_parts = value.split('-')
if len(lang_parts) > 1:
value = lang_parts[0].lower() + '-' + lang_parts[1].upper()
if value not in self.raw_text_query.languages:
self.raw_text_query.languages.append(value)
found = True
return found
def _autocomplete(self, value):
if not value:
# show some example queries
if len(settings['search']['languages']) < 10:
for lang in settings['search']['languages']:
self.raw_text_query.autocomplete_list.append(':' + lang)
else:
for lang in [":en", ":en_us", ":english", ":united_kingdom"]:
self.raw_text_query.autocomplete_list.append(lang)
return
for lc in sxng_locales:
if lc[0] not in settings['search']['languages']:
continue
lang_id, lang_name, country, english_name, _flag = 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('!!') and len(raw_value) > 2
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):
# make sure it's not any bang with double '!!'
return raw_value[0] == '!' and (len(raw_value) < 2 or raw_value[1] != '!')
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 value in engine_shortcuts:
value = engine_shortcuts[value]
# check if prefix is equal with engine name
if value in engines:
self.raw_text_query.enginerefs.append(EngineRef(value, 'none'))
return True
# check if prefix is equal with category name
if value in categories:
# using all engines for that search, which
# are declared under that category name
self.raw_text_query.enginerefs.extend(
EngineRef(engine.name, value)
for engine in categories[value]
if (engine.name, value) not in self.raw_text_query.disabled_engines
)
return True
return False
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 category name
for category in categories:
if category.startswith(value):
self._add_autocomplete(first_char + category.replace(' ', '_'))
# 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 FeelingLuckyParser(QueryPartParser):
@staticmethod
def check(raw_value):
return raw_value == '!!'
def __call__(self, raw_value):
self.raw_text_query.redirect_to_first_result = True
return True
class RawTextQuery:
"""parse raw text query (the value from the html input)"""
PARSER_CLASSES = [
TimeoutParser, # force the timeout
LanguageParser, # force a language
ExternalBangParser, # external bang (must be before BangParser)
BangParser, # force an engine or category
FeelingLuckyParser, # redirect to the first link in the results list
]
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.redirect_to_first_result = False
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
qlist = self.query_parts if special_part else self.user_query_parts
qlist.append(query_part)
last_index_location = (qlist, len(qlist) - 1)
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 query 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} >\n"
+ f"redirect_to_first_result={self.redirect_to_first_result!r}"
)
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