[enh] json engine added

searx/engines/json_engine.py

@@ -0,0 +1,79 @@
+from urllib import urlencode
+from json import loads
+from collections import Iterable
+
+search_url    = None
+url_query     = None
+content_query = None
+title_query   = None
+#suggestion_xpath = ''
+
+def iterate(iterable):
+    if type(iterable) == dict:
+        it = iterable.iteritems()
+
+    else:
+        it = enumerate(iterable)
+    for index, value in it:
+        yield str(index), value
+
+def is_iterable(obj):
+    if type(obj) == str: return False
+    if type(obj) == unicode: return False
+    return isinstance(obj, Iterable)
+
+def parse(query):
+    q = []
+    for part in query.split('/'):
+        if part == '':
+            continue
+        else:
+            q.append(part)
+    return q
+
+def do_query(data, q):
+    ret = []
+    if not len(q):
+        return ret
+
+    qkey = q[0]
+
+    for key,value in iterate(data):
+
+        if len(q) == 1:
+            if key == qkey:
+                ret.append(value)
+            elif is_iterable(value):
+                ret.extend(do_query(value, q))
+        else:
+            if not is_iterable(value):
+                continue
+            if key == qkey:
+                ret.extend(do_query(value, q[1:]))
+            else:
+                ret.extend(do_query(value, q))
+    return ret
+
+def query(data, query_string):
+    q = parse(query_string)
+
+    return do_query(data, q)
+
+def request(query, params):
+    query = urlencode({'q': query})[2:]
+    params['url'] = search_url.format(query=query)
+    params['query'] = query
+    return params
+
+
+def response(resp):
+    results = []
+
+    json = loads(resp.text)
+
+    urls = query(json, url_query)
+    contents = query(json, content_query)
+    titles = query(json, title_query)
+    for url, title, content in zip(urls, titles, contents):
+        results.append({'url': url, 'title': title, 'content': content})
+    return results