From a35128f5e0af70d2a858f736e020ce451f652565 Mon Sep 17 00:00:00 2001
From: asciimoo <asciimoo@gmail.com>
Date: Sun, 1 Dec 2013 16:41:24 +0100
Subject: [PATCH] [enh] smarter currency query parse

---
 searx/engines/currency_convert.py | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/searx/engines/currency_convert.py b/searx/engines/currency_convert.py
index c6a4f29ca..b8ba7707f 100644
--- a/searx/engines/currency_convert.py
+++ b/searx/engines/currency_convert.py
@@ -1,21 +1,25 @@
 from datetime import datetime
+import re
 
 categories = []
 url = 'http://finance.yahoo.com/d/quotes.csv?e=.csv&f=sl1d1t1&s={query}=X'
 weight = 100
 
+parser_re = re.compile(r'^\W*(\d+(?:\.\d+)?)\W*([a-z]{3})\W*(?:in)?\W*([a-z]{3})\W*$')
+
 def request(query, params):
+    m = parser_re.match(query)
+    if not m:
+        # wrong query
+        return params
     try:
-        # eg.: "X EUR in USD"
-        ammount, from_currency, _, to_currency = query.split()
+        ammount, from_currency, to_currency = m.groups()
         ammount = float(ammount)
     except:
         # wrong params
         return params
 
     q = (from_currency+to_currency).upper()
-    if not q.isalpha():
-        return params
 
     params['url'] = url.format(query=q)
     params['ammount'] = ammount