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crawler.rb
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crawler.rb
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require 'nokogiri'
require 'open-uri'
require 'csv'
BASE_URL = "http://kural.muthu.org/"
def get_document(query_string)
Nokogiri::HTML(open("#{BASE_URL}#{query_string}"))
end
def get_query_strings(doc, xpath="//table[3]//a[@href]")
doc.xpath(xpath).map { |link| link.attr('href') }
end
def get_chapter_query_strings(doc)
chapter_links = get_query_strings(doc)
end
def get_verses_query_strings(query_string)
doc = get_document(query_string)
get_query_strings(doc)
end
def get_verse_and_english_translation(query_string)
doc = get_document(query_string)
verse = doc.xpath("//table[3]//tr[5]//td[2]").first.text
chapter_name = doc.xpath("//table[3]//tr[1]//td").text
section_name = doc.xpath("//table[3]//tr[3]//td").text
translation_and_explanation = doc.xpath("//table[4]//tr[2]//td[1]|//table[4]//tr[3]//td[1]")
translation = translation_and_explanation.first.text
explanation = translation_and_explanation.last.text
{:chapter_name => chapter_name, :section_name => section_name, :verse => verse, :translation => translation, :explanation => explanation}
end
CSV.open('thirukural.csv', "wb") do |csv|
csv << ["Chapter Name","Section Name","Verse","Translation","Explanation"]
(1..3).each do |pid|
doc = get_document("?pid=#{pid}")
chapter_links = get_chapter_query_strings(doc)
verses_query_strings = chapter_links.collect {|query_string|get_verses_query_strings(query_string)}.flatten
verses_query_strings.collect do |query_string|
verse = get_verse_and_english_translation(query_string)
csv << [verse[:chapter_name], verse[:section_name], verse[:verse], verse[:translation], verse[:explanation]]
p verse[:verse]
end
end
end