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#!/usr/bin/env python
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# SPDX-License-Identifier: AGPL-3.0-or-later
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"""Fetch units from :origin:`searx/engines/wikidata.py` engine.
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Output file: :origin:`searx/data/wikidata_units.json` (:origin:`CI Update data
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... <.github/workflows/data-update.yml>`).
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"""
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import json
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import collections
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# set path
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from os.path import join
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from searx import searx_dir
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from searx.engines import wikidata, set_loggers
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from searx.data import data_dir
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DATA_FILE = data_dir / 'wikidata_units.json'
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set_loggers(wikidata, 'wikidata')
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# the response contains duplicate ?item with the different ?symbol
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# "ORDER BY ?item DESC(?rank) ?symbol" provides a deterministic result
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# even if a ?item has different ?symbol of the same rank.
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# A deterministic result
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# see:
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# * https://www.wikidata.org/wiki/Help:Ranking
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# * https://www.mediawiki.org/wiki/Wikibase/Indexing/RDF_Dump_Format ("Statement representation" section)
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# * https://w.wiki/32BT
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# * https://en.wikibooks.org/wiki/SPARQL/WIKIDATA_Precision,_Units_and_Coordinates#Quantities
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# see the result for https://www.wikidata.org/wiki/Q11582
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# there are multiple symbols the same rank
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SARQL_REQUEST = """
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SELECT DISTINCT ?item ?symbol ?tosi ?tosiUnit
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WHERE
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{
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?item wdt:P31/wdt:P279 wd:Q47574 .
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?item p:P5061 ?symbolP .
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?symbolP ps:P5061 ?symbol ;
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wikibase:rank ?rank .
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OPTIONAL {
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?item p:P2370 ?tosistmt .
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?tosistmt psv:P2370 ?tosinode .
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?tosinode wikibase:quantityAmount ?tosi .
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?tosinode wikibase:quantityUnit ?tosiUnit .
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}
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FILTER(LANG(?symbol) = "en").
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}
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ORDER BY ?item DESC(?rank) ?symbol
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"""
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def get_data():
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results = collections.OrderedDict()
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response = wikidata.send_wikidata_query(SARQL_REQUEST)
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for unit in response['results']['bindings']:
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symbol = unit['symbol']['value']
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name = unit['item']['value'].rsplit('/', 1)[1]
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si_name = unit.get('tosiUnit', {}).get('value', '')
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if si_name:
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si_name = si_name.rsplit('/', 1)[1]
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to_si_factor = unit.get('tosi', {}).get('value', '')
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if name not in results:
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# ignore duplicate: always use the first one
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results[name] = {
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'symbol': symbol,
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'si_name': si_name if si_name else None,
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'to_si_factor': float(to_si_factor) if to_si_factor else None,
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}
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return results
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def get_wikidata_units_filename():
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return join(join(searx_dir, "data"), "")
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if __name__ == '__main__':
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with DATA_FILE.open('w', encoding="utf8") as f:
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json.dump(get_data(), f, indent=4, sort_keys=True, ensure_ascii=False)
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