76 lines
3.0 KiB
Python
76 lines
3.0 KiB
Python
from source import Source
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from scrapy import log
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from scrapy.http import Request
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from scrapy.selector import Selector
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from FourmiCrawler.items import Result
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class NIST(Source):
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website = "http://webbook.nist.gov/*"
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search = 'cgi/cbook.cgi?Name=%s&Units=SI&cTP=on'
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def __init__(self):
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Source.__init__(self)
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def parse(self, response):
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sel = Selector(response)
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requests = []
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symbol_table = {}
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tds = sel.xpath('//table[@class="symbol_table"]/tr/td')
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for (symbol_td, name_td) in zip(tds[::2], tds[1::2]):
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symbol = ''.join(symbol_td.xpath('node()').extract())
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name = name_td.xpath('text()').extract()[0]
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symbol_table[symbol] = name
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log.msg('NIST symbol: |%s|, name: |%s|' % (symbol, name),
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level=log.DEBUG)
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for tables in sel.xpath('//table[@class="data"]'):
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if tables.xpath('@summary').extract()[0] == 'One dimensional data':
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log.msg('NIST table: Aggregrate data', level=log.DEBUG)
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requests.extend(
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self.parse_aggregate_data(tables, symbol_table))
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elif tables.xpath('tr/th="Initial Phase"').extract()[0] == '1':
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log.msg('NIST table; Enthalpy/entropy of phase transition',
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level=log.DEBUG)
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elif tables.xpath('tr[1]/td'):
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log.msg('NIST table: Horizontal table', level=log.DEBUG)
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elif (tables.xpath('@summary').extract()[0] ==
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'Antoine Equation Parameters'):
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log.msg('NIST table: Antoine Equation Parameters',
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level=log.DEBUG)
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elif len(tables.xpath('tr[1]/th')) == 5:
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log.msg('NIST table: generic 5 columns', level=log.DEBUG)
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# Symbol (unit) Temperature (K) Method Reference Comment
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elif len(tables.xpath('tr[1]/th')) == 4:
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log.msg('NIST table: generic 4 columns', level=log.DEBUG)
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# Symbol (unit) Temperature (K) Reference Comment
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else:
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log.msg('NIST table: NOT SUPPORTED', level=log.WARNING)
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continue #Assume unsupported
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return requests
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@staticmethod
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def parse_aggregate_data(table, symbol_table):
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results = []
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for tr in table.xpath('tr[td]'):
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data = []
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for td in tr.xpath('td'):
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data.append(''.join(td.xpath('node()').extract()))
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result = Result({
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'attribute': symbol_table[data[0]],
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'value': data[1] + ' ' + data[2],
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'source': 'NIST',
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'reliability': 'Unknown',
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'conditions': ''
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})
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log.msg('NIST: |%s|' % data, level=log.DEBUG)
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results.append(result)
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return results
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def new_compound_request(self, compound):
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return Request(url=self.website[:-1] + self.search % compound,
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callback=self.parse)
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