1 files changed, 86 insertions, 0 deletions
diff --git a/searx/engines/wolframalpha_noapi.py b/searx/engines/wolframalpha_noapi.py
new file mode 100644
index 000000000..291fee04d
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+++ b/searx/engines/wolframalpha_noapi.py
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+# WolframAlpha (Maths)
+#
+# @website     http://www.wolframalpha.com/
+# @provide-api yes (http://api.wolframalpha.com/v2/)
+#
+# @using-api   no
+# @results     HTML
+# @stable      no
+# @parse       answer
+
+from re import search, sub
+from json import loads
+from urllib import urlencode
+from lxml import html
+import HTMLParser
+
+# search-url
+url = 'http://www.wolframalpha.com/'
+search_url = url + 'input/?{query}'
+
+# xpath variables
+scripts_xpath = '//script'
+title_xpath = '//title'
+failure_xpath = '//p[attribute::class="pfail"]'
+
+
+# do search-request
+def request(query, params):
+    params['url'] = search_url.format(query=urlencode({'i': query}))
+
+    return params
+
+
+# get response from search-request
+def response(resp):
+    results = []
+    line = None
+
+    dom = html.fromstring(resp.text)
+    scripts = dom.xpath(scripts_xpath)
+
+    # the answer is inside a js function
+    # answer can be located in different 'pods', although by default it should be in pod_0200
+    possible_locations = ['pod_0200\.push\((.*)',
+                          'pod_0100\.push\((.*)']
+
+    # failed result
+    if dom.xpath(failure_xpath):
+        return results
+
+    # get line that matches the pattern
+    for pattern in possible_locations:
+        for script in scripts:
+            try:
+                line = search(pattern, script.text_content()).group(1)
+                break
+            except AttributeError:
+                continue
+        if line:
+            break
+
+    if line:
+        # extract answer from json
+        answer = line[line.find('{'):line.rfind('}') + 1]
+        try:
+            answer = loads(answer)
+        except Exception:
+            answer = loads(answer.encode('unicode-escape'))
+        answer = answer['stringified']
+
+        # clean plaintext answer
+        h = HTMLParser.HTMLParser()
+        answer = h.unescape(answer.decode('unicode-escape'))
+        answer = sub(r'\\', '', answer)
+
+        results.append({'answer': answer})
+
+    # user input is in first part of title
+    title = dom.xpath(title_xpath)[0].text.encode('utf-8')
+    result_url = request(title[:-16], {})['url']
+
+    # append result
+    results.append({'url': result_url,
+                    'title': title.decode('utf-8')})
+
+    return results