338 lines
12 KiB
Python
338 lines
12 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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from abc import abstractmethod, ABC
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import re
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from searx import settings
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from searx.languages import language_codes
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from searx.engines import categories, engines, engine_shortcuts
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from searx.external_bang import get_bang_definition_and_autocomplete
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from searx.search import EngineRef
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from searx.webutils import VALID_LANGUAGE_CODE
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class QueryPartParser(ABC):
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__slots__ = "raw_text_query", "enable_autocomplete"
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@staticmethod
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@abstractmethod
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def check(raw_value):
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"""Check if raw_value can be parsed"""
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def __init__(self, raw_text_query, enable_autocomplete):
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self.raw_text_query = raw_text_query
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self.enable_autocomplete = enable_autocomplete
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@abstractmethod
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def __call__(self, raw_value):
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"""Try to parse raw_value: set the self.raw_text_query properties
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return True if raw_value has been parsed
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self.raw_text_query.autocomplete_list is also modified
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if self.enable_autocomplete is True
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"""
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def _add_autocomplete(self, value):
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if value not in self.raw_text_query.autocomplete_list:
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self.raw_text_query.autocomplete_list.append(value)
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class TimeoutParser(QueryPartParser):
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@staticmethod
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def check(raw_value):
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return raw_value[0] == '<'
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def __call__(self, raw_value):
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value = raw_value[1:]
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found = self._parse(value) if len(value) > 0 else False
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if self.enable_autocomplete and not value:
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self._autocomplete()
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return found
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def _parse(self, value):
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if not value.isdigit():
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return False
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raw_timeout_limit = int(value)
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if raw_timeout_limit < 100:
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# below 100, the unit is the second ( <3 = 3 seconds timeout )
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self.raw_text_query.timeout_limit = float(raw_timeout_limit)
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else:
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# 100 or above, the unit is the millisecond ( <850 = 850 milliseconds timeout )
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self.raw_text_query.timeout_limit = raw_timeout_limit / 1000.0
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return True
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def _autocomplete(self):
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for suggestion in ['<3', '<850']:
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self._add_autocomplete(suggestion)
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class LanguageParser(QueryPartParser):
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@staticmethod
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def check(raw_value):
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return raw_value[0] == ':'
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def __call__(self, raw_value):
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value = raw_value[1:].lower().replace('_', '-')
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found = self._parse(value) if len(value) > 0 else False
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if self.enable_autocomplete and not found:
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self._autocomplete(value)
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return found
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def _parse(self, value):
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found = False
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# check if any language-code is equal with
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# declared language-codes
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for lc in language_codes:
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lang_id, lang_name, country, english_name = map(str.lower, lc)
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# if correct language-code is found
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# set it as new search-language
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if (value == lang_id
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or value == lang_name
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or value == english_name
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or value.replace('-', ' ') == country)\
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and value not in self.raw_text_query.languages:
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found = True
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lang_parts = lang_id.split('-')
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if len(lang_parts) == 2:
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self.raw_text_query.languages.append(lang_parts[0] + '-' + lang_parts[1].upper())
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else:
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self.raw_text_query.languages.append(lang_id)
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# to ensure best match (first match is not necessarily the best one)
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if value == lang_id:
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break
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# user may set a valid, yet not selectable language
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if VALID_LANGUAGE_CODE.match(value):
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lang_parts = value.split('-')
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if len(lang_parts) > 1:
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value = lang_parts[0].lower() + '-' + lang_parts[1].upper()
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if value not in self.raw_text_query.languages:
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self.raw_text_query.languages.append(value)
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found = True
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return found
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def _autocomplete(self, value):
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if not value:
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# show some example queries
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if len(settings['search']['languages']) < 10:
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for lang in settings['search']['languages']:
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self.raw_text_query.autocomplete_list.append(':' + lang)
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else:
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for lang in [":en", ":en_us", ":english", ":united_kingdom"]:
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self.raw_text_query.autocomplete_list.append(lang)
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return
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for lc in language_codes:
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if lc[0] not in settings['search']['languages']:
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continue
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lang_id, lang_name, country, english_name = map(str.lower, lc)
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# check if query starts with language-id
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if lang_id.startswith(value):
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if len(value) <= 2:
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self._add_autocomplete(':' + lang_id.split('-')[0])
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else:
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self._add_autocomplete(':' + lang_id)
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# check if query starts with language name
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if lang_name.startswith(value) or english_name.startswith(value):
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self._add_autocomplete(':' + lang_name)
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# check if query starts with country
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# here "new_zealand" is "new-zealand" (see __call__)
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if country.startswith(value.replace('-', ' ')):
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self._add_autocomplete(':' + country.replace(' ', '_'))
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class ExternalBangParser(QueryPartParser):
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@staticmethod
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def check(raw_value):
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return raw_value.startswith('!!')
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def __call__(self, raw_value):
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value = raw_value[2:]
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found, bang_ac_list = self._parse(value) if len(value) > 0 else (False, [])
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if self.enable_autocomplete:
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self._autocomplete(bang_ac_list)
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return found
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def _parse(self, value):
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found = False
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bang_definition, bang_ac_list = get_bang_definition_and_autocomplete(value)
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if bang_definition is not None:
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self.raw_text_query.external_bang = value
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found = True
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return found, bang_ac_list
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def _autocomplete(self, bang_ac_list):
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if not bang_ac_list:
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bang_ac_list = ['g', 'ddg', 'bing']
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for external_bang in bang_ac_list:
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self._add_autocomplete('!!' + external_bang)
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class BangParser(QueryPartParser):
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@staticmethod
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def check(raw_value):
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return raw_value[0] == '!' or raw_value[0] == '?'
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def __call__(self, raw_value):
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value = raw_value[1:].replace('-', ' ').replace('_', ' ')
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found = self._parse(value) if len(value) > 0 else False
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if found and raw_value[0] == '!':
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self.raw_text_query.specific = True
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if self.enable_autocomplete:
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self._autocomplete(raw_value[0], value)
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return found
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def _parse(self, value):
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# check if prefix is equal with engine shortcut
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if value in engine_shortcuts:
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value = engine_shortcuts[value]
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# check if prefix is equal with engine name
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if value in engines:
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self.raw_text_query.enginerefs.append(EngineRef(value, 'none'))
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return True
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# check if prefix is equal with categorie name
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if value in categories:
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# using all engines for that search, which
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# are declared under that categorie name
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self.raw_text_query.enginerefs.extend(EngineRef(engine.name, value)
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for engine in categories[value]
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if (engine.name, value) not in self.raw_text_query.disabled_engines)
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return True
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return False
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def _autocomplete(self, first_char, value):
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if not value:
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# show some example queries
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for suggestion in ['images', 'wikipedia', 'osm']:
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if suggestion not in self.raw_text_query.disabled_engines or suggestion in categories:
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self._add_autocomplete(first_char + suggestion)
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return
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# check if query starts with categorie name
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for category in categories:
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if category.startswith(value):
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self._add_autocomplete(first_char + category)
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# check if query starts with engine name
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for engine in engines:
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if engine.startswith(value):
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self._add_autocomplete(first_char + engine.replace(' ', '_'))
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# check if query starts with engine shortcut
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for engine_shortcut in engine_shortcuts:
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if engine_shortcut.startswith(value):
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self._add_autocomplete(first_char + engine_shortcut)
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class RawTextQuery:
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"""parse raw text query (the value from the html input)"""
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PARSER_CLASSES = [
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TimeoutParser, # this force the timeout
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LanguageParser, # this force a language
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ExternalBangParser, # external bang (must be before BangParser)
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BangParser # this force a engine or category
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]
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def __init__(self, query, disabled_engines):
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assert isinstance(query, str)
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# input parameters
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self.query = query
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self.disabled_engines = disabled_engines if disabled_engines else []
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# parsed values
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self.enginerefs = []
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self.languages = []
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self.timeout_limit = None
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self.external_bang = None
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self.specific = False
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self.autocomplete_list = []
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# internal properties
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self.query_parts = [] # use self.getFullQuery()
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self.user_query_parts = [] # use self.getQuery()
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self.autocomplete_location = None
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self._parse_query()
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def _parse_query(self):
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"""
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parse self.query, if tags are set, which
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change the search engine or search-language
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"""
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# split query, including whitespaces
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raw_query_parts = re.split(r'(\s+)', self.query)
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last_index_location = None
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autocomplete_index = len(raw_query_parts) - 1
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for i, query_part in enumerate(raw_query_parts):
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# part does only contain spaces, skip
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if query_part.isspace()\
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or query_part == '':
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continue
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# parse special commands
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special_part = False
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for parser_class in RawTextQuery.PARSER_CLASSES:
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if parser_class.check(query_part):
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special_part = parser_class(self, i == autocomplete_index)(query_part)
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break
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# append query part to query_part list
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qlist = self.query_parts if special_part else self.user_query_parts
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qlist.append(query_part)
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last_index_location = (qlist, len(qlist) - 1)
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self.autocomplete_location = last_index_location
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def get_autocomplete_full_query(self, text):
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qlist, position = self.autocomplete_location
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qlist[position] = text
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return self.getFullQuery()
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def changeQuery(self, query):
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self.user_query_parts = query.strip().split()
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self.query = self.getFullQuery()
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self.autocomplete_location = (self.user_query_parts, len(self.user_query_parts) - 1)
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self.autocomplete_list = []
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return self
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def getQuery(self):
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return ' '.join(self.user_query_parts)
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def getFullQuery(self):
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"""
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get full querry including whitespaces
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"""
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return '{0} {1}'.format(' '.join(self.query_parts), self.getQuery()).strip()
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def __str__(self):
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return self.getFullQuery()
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def __repr__(self):
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return f"<{self.__class__.__name__} " \
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+ f"query={self.query!r} " \
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+ f"disabled_engines={self.disabled_engines!r}\n " \
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+ f"languages={self.languages!r} " \
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+ f"timeout_limit={self.timeout_limit!r} "\
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+ f"external_bang={self.external_bang!r} " \
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+ f"specific={self.specific!r} " \
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+ f"enginerefs={self.enginerefs!r}\n " \
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+ f"autocomplete_list={self.autocomplete_list!r}\n " \
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+ f"query_parts={self.query_parts!r}\n " \
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+ f"user_query_parts={self.user_query_parts!r} >"
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