Merge pull request #486 from a01200356/master

[enh] WolframAlpha no API engine (and tests for both)

1 files changed, 26 insertions, 9 deletions

diff --git a/searx/engines/wolframalpha_api.py b/searx/engines/wolframalpha_api.py
index d61d25747..303c6c165 100644
--- a/searx/engines/wolframalpha_api.py
+++ b/searx/engines/wolframalpha_api.py
@@ -10,11 +10,18 @@
 
 from urllib import urlencode
 from lxml import etree
+from re import search
 
 # search-url
 base_url = 'http://api.wolframalpha.com/v2/query'
 search_url = base_url + '?appid={api_key}&{query}&format=plaintext'
-api_key = ''
+site_url = 'http://www.wolframalpha.com/input/?{query}'
+api_key = ''  # defined in settings.yml
+
+# xpath variables
+failure_xpath = '/queryresult[attribute::success="false"]'
+answer_xpath = '//pod[attribute::primary="true"]/subpod/plaintext'
+input_xpath = '//pod[starts-with(attribute::title, "Input")]/subpod/plaintext'
 
 
 # do search-request
@@ -45,16 +52,26 @@ def response(resp):
     search_results = etree.XML(resp.content)
 
     # return empty array if there are no results
-    if search_results.xpath('/queryresult[attribute::success="false"]'):
+    if search_results.xpath(failure_xpath):
         return []
 
-    # parse result
-    result = search_results.xpath('//pod[attribute::primary="true"]/subpod/plaintext')[0].text
-    result = replace_pua_chars(result)
+    # parse answers
+    answers = search_results.xpath(answer_xpath)
+    if answers:
+        for answer in answers:
+            answer = replace_pua_chars(answer.text)
+
+            results.append({'answer': answer})
+
+    # if there's no input section in search_results, check if answer has the input embedded (before their "=" sign)
+    try:
+        query_input = search_results.xpath(input_xpath)[0].text
+    except IndexError:
+        query_input = search(u'([^\uf7d9]+)', answers[0].text).group(1)
 
-    # append result
-    # TODO: shouldn't it bind the source too?
-    results.append({'answer': result})
+    # append link to site
+    result_url = site_url.format(query=urlencode({'i': query_input.encode('utf-8')}))
+    results.append({'url': result_url,
+                    'title': query_input + " - Wolfram|Alpha"})
 
-    # return results
     return results