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78 lines
2.2 KiB
Python
78 lines
2.2 KiB
Python
# Wolfram Alpha (Maths)
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#
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# @website http://www.wolframalpha.com
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# @provide-api yes (http://api.wolframalpha.com/v2/)
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#
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# @using-api yes
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# @results XML
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# @stable yes
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# @parse result
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from urllib import urlencode
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from lxml import etree
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from re import search
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# search-url
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base_url = 'http://api.wolframalpha.com/v2/query'
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search_url = base_url + '?appid={api_key}&{query}&format=plaintext'
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site_url = 'http://www.wolframalpha.com/input/?{query}'
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api_key = '' # defined in settings.yml
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# xpath variables
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failure_xpath = '/queryresult[attribute::success="false"]'
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answer_xpath = '//pod[attribute::primary="true"]/subpod/plaintext'
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input_xpath = '//pod[starts-with(attribute::title, "Input")]/subpod/plaintext'
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# do search-request
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def request(query, params):
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params['url'] = search_url.format(query=urlencode({'input': query}),
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api_key=api_key)
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return params
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# replace private user area characters to make text legible
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def replace_pua_chars(text):
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pua_chars = {u'\uf74c': 'd',
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u'\uf74d': u'\u212f',
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u'\uf74e': 'i',
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u'\uf7d9': '='}
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for k, v in pua_chars.iteritems():
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text = text.replace(k, v)
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return text
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# get response from search-request
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def response(resp):
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results = []
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search_results = etree.XML(resp.content)
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# return empty array if there are no results
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if search_results.xpath(failure_xpath):
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return []
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# parse answers
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answers = search_results.xpath(answer_xpath)
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if answers:
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for answer in answers:
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answer = replace_pua_chars(answer.text)
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results.append({'answer': answer})
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# if there's no input section in search_results, check if answer has the input embedded (before their "=" sign)
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try:
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query_input = search_results.xpath(input_xpath)[0].text
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except IndexError:
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query_input = search(u'([^\uf7d9]+)', answers[0].text).group(1)
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# append link to site
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result_url = site_url.format(query=urlencode({'i': query_input.encode('utf-8')}))
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results.append({'url': result_url,
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'title': query_input + " - Wolfram|Alpha"})
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return results
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