[enh] xpath engine added

searx/engines/xpath.py

@@ -0,0 +1,54 @@
+from lxml import html
+from urllib import urlencode
+from urlparse import urlparse, urljoin
+from cgi import escape
+from lxml.etree import _ElementStringResult
+
+search_url    = None
+results_xpath = None
+url_xpath     = None
+content_xpath = None
+title_xpath   = None
+
+def extract_url(xpath_results):
+    url = ''
+    parsed_search_url = urlparse(search_url)
+    if type(xpath_results) == list:
+        if not len(xpath_results):
+            raise Exception('Empty url resultset')
+        if type(xpath_results[0]) == _ElementStringResult:
+            url = ''.join(xpath_results)
+            if url.startswith('//'):
+                url = parsed_search_url.scheme+url
+            elif url.startswith('/'):
+                url = urljoin(search_url, url)
+        #TODO
+        else:
+            url = xpath_results[0].attrib.get('href')
+    else:
+        raise Exception('Cannot handle xpath url resultset')
+    if not url.startswith('http://') or not url.startswith('https://'):
+        url = 'http://'+url
+    parsed_url = urlparse(url)
+    if not parsed_url.netloc:
+        raise Exception('Cannot parse url')
+    return url
+
+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 = []
+    dom = html.fromstring(resp.text)
+    query = resp.search_params['query']
+    for result in dom.xpath(results_xpath):
+        url = extract_url(result.xpath(url_xpath))
+        title = ' '.join(result.xpath(title_xpath))
+        content = escape(' '.join(result.xpath(content_xpath))).replace(query, '<b>{0}</b>'.format(query))
+        results.append({'url': url, 'title': title, 'content': content})
+
+    return results