forked from zaclys/searxng
129 lines
4.1 KiB
Python
129 lines
4.1 KiB
Python
# Wolfram Alpha (Science)
|
|
#
|
|
# @website https://www.wolframalpha.com
|
|
# @provide-api yes (https://api.wolframalpha.com/v2/)
|
|
#
|
|
# @using-api yes
|
|
# @results XML
|
|
# @stable yes
|
|
# @parse url, infobox
|
|
|
|
from urllib import urlencode
|
|
from lxml import etree
|
|
|
|
# search-url
|
|
search_url = 'https://api.wolframalpha.com/v2/query?appid={api_key}&{query}'
|
|
site_url = 'https://www.wolframalpha.com/input/?{query}'
|
|
api_key = '' # defined in settings.yml
|
|
|
|
# xpath variables
|
|
failure_xpath = '/queryresult[attribute::success="false"]'
|
|
answer_xpath = '//pod[attribute::primary="true"]/subpod/plaintext'
|
|
input_xpath = '//pod[starts-with(attribute::id, "Input")]/subpod/plaintext'
|
|
pods_xpath = '//pod'
|
|
subpods_xpath = './subpod'
|
|
pod_primary_xpath = './@primary'
|
|
pod_id_xpath = './@id'
|
|
pod_title_xpath = './@title'
|
|
plaintext_xpath = './plaintext'
|
|
image_xpath = './img'
|
|
img_src_xpath = './@src'
|
|
img_alt_xpath = './@alt'
|
|
|
|
# pods to display as image in infobox
|
|
# this pods do return a plaintext, but they look better and are more useful as images
|
|
image_pods = {'VisualRepresentation',
|
|
'Illustration'}
|
|
|
|
|
|
# do search-request
|
|
def request(query, params):
|
|
params['url'] = search_url.format(query=urlencode({'input': query}),
|
|
api_key=api_key)
|
|
params['headers']['Referer'] = site_url.format(query=urlencode({'i': query}))
|
|
|
|
return params
|
|
|
|
|
|
# replace private user area characters to make text legible
|
|
def replace_pua_chars(text):
|
|
pua_chars = {u'\uf522': u'\u2192', # rigth arrow
|
|
u'\uf7b1': u'\u2115', # set of natural numbers
|
|
u'\uf7b4': u'\u211a', # set of rational numbers
|
|
u'\uf7b5': u'\u211d', # set of real numbers
|
|
u'\uf7bd': u'\u2124', # set of integer numbers
|
|
u'\uf74c': 'd', # differential
|
|
u'\uf74d': u'\u212f', # euler's number
|
|
u'\uf74e': 'i', # imaginary number
|
|
u'\uf7d9': '='} # equals sign
|
|
|
|
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(failure_xpath):
|
|
return []
|
|
|
|
try:
|
|
infobox_title = search_results.xpath(input_xpath)[0].text
|
|
except:
|
|
infobox_title = None
|
|
|
|
pods = search_results.xpath(pods_xpath)
|
|
result = ""
|
|
result_chunks = []
|
|
for pod in pods:
|
|
pod_id = pod.xpath(pod_id_xpath)[0]
|
|
pod_title = pod.xpath(pod_title_xpath)[0]
|
|
pod_is_result = pod.xpath(pod_primary_xpath)
|
|
|
|
subpods = pod.xpath(subpods_xpath)
|
|
if not subpods:
|
|
continue
|
|
|
|
# Appends either a text or an image, depending on which one is more suitable
|
|
for subpod in subpods:
|
|
content = subpod.xpath(plaintext_xpath)[0].text
|
|
image = subpod.xpath(image_xpath)
|
|
|
|
if content and pod_id not in image_pods:
|
|
|
|
if pod_is_result:
|
|
result = content
|
|
|
|
# if no input pod was found, title is first plaintext pod
|
|
if not infobox_title:
|
|
infobox_title = content
|
|
|
|
content = replace_pua_chars(content)
|
|
result_chunks.append({'label': pod_title, 'value': content})
|
|
|
|
elif image:
|
|
result_chunks.append({'label': pod_title,
|
|
'image': {'src': image[0].xpath(img_src_xpath)[0],
|
|
'alt': image[0].xpath(img_alt_xpath)[0]}})
|
|
|
|
if not result_chunks:
|
|
return []
|
|
|
|
# append infobox
|
|
results.append({'infobox': infobox_title,
|
|
'attributes': result_chunks,
|
|
'urls': [{'title': 'Wolfram|Alpha', 'url': resp.request.headers['Referer'].decode('utf8')}]})
|
|
|
|
# append link to site
|
|
results.append({'url': resp.request.headers['Referer'].decode('utf8'),
|
|
'title': infobox_title + ' - Wolfram|Alpha',
|
|
'content': result})
|
|
|
|
return results
|