mirror of
https://github.com/searxng/searxng.git
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157 lines
4.9 KiB
Python
157 lines
4.9 KiB
Python
# SPDX-License-Identifier: AGPL-3.0-or-later
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"""A plugin for converting measured values from one unit to another unit (a
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unit converter).
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The plugin looks up the symbols (given in the query term) in a list of
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converters, each converter is one item in the list (compare
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:py:obj:`ADDITIONAL_UNITS`). If the symbols are ambiguous, the matching units
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of measurement are evaluated. The weighting in the evaluation results from the
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sorting of the :py:obj:`list of unit converters<symbol_to_si>`.
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"""
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import typing
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import re
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import babel.numbers
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from flask_babel import gettext, get_locale
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from searx.wikidata_units import symbol_to_si
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from searx.plugins import Plugin, PluginInfo
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from searx.result_types import EngineResults
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if typing.TYPE_CHECKING:
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from searx.search import SearchWithPlugins
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from searx.extended_types import SXNG_Request
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from searx.plugins import PluginCfg
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name = ""
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description = gettext("")
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plugin_id = ""
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preference_section = ""
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CONVERT_KEYWORDS = ["in", "to", "as"]
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class SXNGPlugin(Plugin):
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"""Convert between units. The result is displayed in area for the
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"answers".
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"""
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id = "unit_converter"
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def __init__(self, plg_cfg: "PluginCfg") -> None:
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super().__init__(plg_cfg)
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self.info = PluginInfo(
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id=self.id,
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name=gettext("Unit converter plugin"),
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description=gettext("Convert between units"),
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preference_section="general",
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)
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def post_search(self, request: "SXNG_Request", search: "SearchWithPlugins") -> EngineResults:
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results = EngineResults()
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# only convert between units on the first page
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if search.search_query.pageno > 1:
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return results
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query = search.search_query.query
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query_parts = query.split(" ")
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if len(query_parts) < 3:
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return results
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for query_part in query_parts:
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for keyword in CONVERT_KEYWORDS:
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if query_part == keyword:
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from_query, to_query = query.split(keyword, 1)
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target_val = _parse_text_and_convert(from_query.strip(), to_query.strip())
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if target_val:
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results.add(results.types.Answer(answer=target_val))
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return results
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# inspired from https://stackoverflow.com/a/42475086
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RE_MEASURE = r'''
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(?P<sign>[-+]?) # +/- or nothing for positive
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(\s*) # separator: white space or nothing
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(?P<number>[\d\.,]*) # number: 1,000.00 (en) or 1.000,00 (de)
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(?P<E>[eE][-+]?\d+)? # scientific notation: e(+/-)2 (*10^2)
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(\s*) # separator: white space or nothing
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(?P<unit>\S+) # unit of measure
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'''
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def _parse_text_and_convert(from_query, to_query) -> str | None:
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# pylint: disable=too-many-branches, too-many-locals
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if not (from_query and to_query):
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return None
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measured = re.match(RE_MEASURE, from_query, re.VERBOSE)
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if not (measured and measured.group('number'), measured.group('unit')):
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return None
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# Symbols are not unique, if there are several hits for the from-unit, then
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# the correct one must be determined by comparing it with the to-unit
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# https://github.com/searxng/searxng/pull/3378#issuecomment-2080974863
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# first: collecting possible units
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source_list, target_list = [], []
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for symbol, si_name, from_si, to_si, orig_symbol in symbol_to_si():
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if symbol == measured.group('unit'):
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source_list.append((si_name, to_si))
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if symbol == to_query:
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target_list.append((si_name, from_si, orig_symbol))
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if not (source_list and target_list):
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return None
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source_to_si = target_from_si = target_symbol = None
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# second: find the right unit by comparing list of from-units with list of to-units
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for source in source_list:
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for target in target_list:
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if source[0] == target[0]: # compare si_name
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source_to_si = source[1]
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target_from_si = target[1]
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target_symbol = target[2]
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if not (source_to_si and target_from_si):
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return None
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_locale = get_locale() or 'en_US'
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value = measured.group('sign') + measured.group('number') + (measured.group('E') or '')
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value = babel.numbers.parse_decimal(value, locale=_locale)
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# convert value to SI unit
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if isinstance(source_to_si, (float, int)):
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value = float(value) * source_to_si
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else:
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value = source_to_si(float(value))
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# convert value from SI unit to target unit
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if isinstance(target_from_si, (float, int)):
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value = float(value) * target_from_si
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else:
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value = target_from_si(float(value))
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if measured.group('E'):
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# when incoming notation is scientific, outgoing notation is scientific
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result = babel.numbers.format_scientific(value, locale=_locale)
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else:
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result = babel.numbers.format_decimal(value, locale=_locale, format='#,##0.##########;-#')
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return f'{result} {target_symbol}'
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