Class: SearchEngine

Inherits:
Object
  • Object
show all
Defined in:
lib/search_engine.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SearchEngine

Returns a new instance of SearchEngine.



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# File 'lib/search_engine.rb', line 8

def initialize
  self.uri = "http://www.google.com/uds/GwebSearch?start=0"\
             "&rsz=large&hl=en&key=notsupplied&v=1.0&"
end

Instance Attribute Details

#uri ⇒ Object

Returns the value of attribute uri.



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# File 'lib/search_engine.rb', line 5

def uri
  @uri
end

Instance Method Details

#build_url(query, page) ⇒ Object 



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# File 'lib/search_engine.rb', line 31

def build_url(query, page)
	start = (page - 1) * 8
   self.uri.chomp! "&rsz=large&hl=en&key=notsupplied&v=1.0&"
   
   while self.uri[-1, 1] != "=" do
     self.uri.chop!
   end
   
   self.uri << "#{start}&rsz=large&hl=en&key=notsupplied&v=1.0&"

	query.strip!
   q_uri = URI.encode_www_form('q' => query)

   return self.uri + q_uri + "&filter=1"
end

#extract_fields(fields, hash_results) ⇒ Object 



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# File 'lib/search_engine.rb', line 48

def extract_fields(fields, hash_results)
  extracted_results = []
  if fields.empty?
    raise "No fields given."
  else
    fields.each do |f|
      index = 0
      
      hash_results.each do |hr|
        if hr.has_key?(f)
          extracted_results << hash_results[index][f]
          index += 1
        end
      end
    end
  end
  
  return extracted_results
end

#get_result_count(query) ⇒ Object 



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# File 'lib/search_engine.rb', line 69

def get_result_count(query)
  cursor_hash = open_file(query)
  return cursor_hash[:responseData][:cursor][:resultCount]
end

#get_search_time(query) ⇒ Object 



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# File 'lib/search_engine.rb', line 75

def get_search_time(query)
  cursor_hash = open_file(query)
  return cursor_hash[:responseData][:cursor][:searchResultTime]
end

#search(query, *fields, pages: 1) ⇒ Object 



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# File 'lib/search_engine.rb', line 14

def search(query, *fields, pages: 1)
  results = []
  raise "No query given" if query.empty?
  
  for i in 1..pages
	uri = build_url(query, i)
	file = open(uri)
  	my_hash = JSON.parse(file.read, symbolize_names: true)
    raise "Page is out of bounds" unless !my_hash[:responseData].nil?
	hash_results = my_hash[:responseData][:results]
    results << extract_fields(fields, hash_results)
  end
  
  return results
end