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# 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
# search-url
base_url = 'http://api.wolframalpha.com/v2/query'
search_url = base_url + '?appid={api_key}&{query}&format=plaintext'
api_key = ''
# do search-request
def request(query, params):
params['url'] = search_url.format(query=urlencode({'input': query}),
api_key=api_key)
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 answer
answer = search_results.xpath('//pod[attribute::primary="true"]/subpod/plaintext')
if not answer:
return results
answer = replace_pua_chars(answer[0].text)
# append result
# TODO: shouldn't it bind the source too?
results.append({'answer': answer})
# return results
return results
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