searxng/searx/engines/wolframalpha_api.py
2015-12-27 21:09:45 -06:00

68 lines
1.8 KiB
Python

# Wolfram Alpha (Maths)
#
# @website http://www.wolframalpha.com
# @provide-api yes (http://api.wolframalpha.com/v2/)
#
# @using-api yes
# @results XML
# @stable yes
# @parse result
from urllib import urlencode
from lxml import etree
from searx.engines.xpath import extract_text
from searx.utils import html_to_text
# search-url
base_url = 'http://api.wolframalpha.com/v2/query'
search_url = base_url + '?appid={api_key}&{query}&format=plaintext'
site_url = 'http://wolframalpha.com/input/?{query}'
# do search-request
def request(query, params):
params['url'] = search_url.format(query=urlencode({'input': query}),
api_key=api_key)
# need this for url in response
global my_query
my_query = query
return params
# replace private user area characters to make text legible
def replace_pua_chars(text):
pua_chars = { u'\uf74c': 'd',
u'\uf74d': u'\u212f',
u'\uf74e': 'i',
u'\uf7d9': '=' }
for k, v in pua_chars.iteritems():
text = text.replace(k, v)
return text
# get response from search-request
def response(resp):
results = []
search_results = etree.XML(resp.content)
# return empty array if there are no results
if search_results.xpath('/queryresult[attribute::success="false"]'):
return []
# parse result
result = search_results.xpath('//pod[attribute::primary="true"]/subpod/plaintext')[0].text
result = replace_pua_chars(result)
# bind url from site
result_url = site_url.format(query=urlencode({'i': my_query}))
# append result
# TODO: shouldn't it bind the source too?
results.append({'url': result_url,
'answer': result})
# return results
return results