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searx/search/processors/online_currency.py

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+# SPDX-License-Identifier: AGPL-3.0-or-later
+"""Processors for engine-type: ``online_currency``
+
+"""
+
+import unicodedata
+import re
+
+from searx.data import CURRENCIES
+from .online import OnlineProcessor
+
+parser_re = re.compile('.*?(\\d+(?:\\.\\d+)?) ([^.0-9]+) (?:in|to) ([^.0-9]+)', re.I)
+
+
+def normalize_name(name: str):
+    name = name.strip()
+    name = name.lower().replace('-', ' ').rstrip('s')
+    name = re.sub(' +', ' ', name)
+    return unicodedata.normalize('NFKD', name).lower()
+
+
+class OnlineCurrencyProcessor(OnlineProcessor):
+    """Processor class used by ``online_currency`` engines."""
+
+    engine_type = 'online_currency'
+
+    def get_params(self, search_query, engine_category):
+        """Returns a set of :ref:`request params <engine request online_currency>`
+        or ``None`` if search query does not match to :py:obj:`parser_re`."""
+
+        params = super().get_params(search_query, engine_category)
+        if params is None:
+            return None
+
+        m = parser_re.match(search_query.query)
+        if not m:
+            return None
+
+        amount_str, from_currency, to_currency = m.groups()
+        try:
+            amount = float(amount_str)
+        except ValueError:
+            return None
+
+        from_currency = CURRENCIES.name_to_iso4217(normalize_name(from_currency))
+        to_currency = CURRENCIES.name_to_iso4217(normalize_name(to_currency))
+
+        params['amount'] = amount
+        params['from'] = from_currency
+        params['to'] = to_currency
+        params['from_name'] = CURRENCIES.iso4217_to_name(from_currency, "en")
+        params['to_name'] = CURRENCIES.iso4217_to_name(to_currency, "en")
+        return params
+
+    def get_default_tests(self):
+        tests = {}
+
+        tests['currency'] = {
+            'matrix': {'query': '1337 usd in rmb'},
+            'result_container': ['has_answer'],
+        }
+
+        return tests