How to resolve the algorithm Yahoo! search interface step by step in the Ruby programming language

Published on 12 May 2024 09:40 PM
#Ruby

How to resolve the algorithm Yahoo! search interface step by step in the Ruby programming language

Table of Contents

Problem Statement

Create a class for searching Yahoo! results. It must implement a Next Page method, and read URL, Title and Content from results.

Let's start with the solution:

Step by Step solution about How to resolve the algorithm Yahoo! search interface step by step in the Ruby programming language

The source code you provided is a Ruby program that searches for results on Yahoo! using the Hpricot library for parsing HTML.

The SearchResult struct is defined to store the URL, title, and content of each search result.

The SearchYahoo class is defined to perform the search. It takes a search term as a parameter and initializes the @term, @page, @results, and @url instance variables.

The next_result method returns the next search result. If there are no more results, it calls the next_page method to fetch the next page of results.

The fetch_results method fetches the search results from Yahoo! using the @url instance variable. It uses the open method to open the URL and the Hpricot library to parse the HTML.

The next_page method increments the @page instance variable by 10 and calls the fetch_results method.

The parse_html method parses the HTML document and extracts the search results. It uses the search method to find the elements that contain the search results.

The main method creates a new SearchYahoo object with the search term "test". It then calls the next_result method 15 times and prints the title, URL, and content of each search result.

Source code in the ruby programming language

require 'open-uri'
require 'hpricot'

SearchResult = Struct.new(:url, :title, :content)

class SearchYahoo
  @@urlinfo = [nil, 'ca.search.yahoo.com', 80, '/search', nil, nil]

  def initialize(term)
    @term = term
    @page = 1
    @results = nil
    @url = URI::HTTP.build(@@urlinfo)
  end

  def next_result
    if not @results
      @results = []
      fetch_results
    elsif @results.empty?
      next_page
    end
    @results.shift
  end

  def fetch_results
    @url.query = URI.escape("p=%s&b=%d" % [@term, @page])
    doc = open(@url) { |f| Hpricot(f) }  
    parse_html(doc)
  end

  def next_page
    @page += 10
    fetch_results
  end

  def parse_html(doc)
    doc.search("div#main").search("div").each do |div|
      next unless div.has_attribute?("class") and div.get_attribute("class").index("res") == 0
      result = SearchResult.new
      div.search("a").each do |link|
        next unless link.has_attribute?("class") and link.get_attribute("class") == "yschttl spt"
        result.url = link.get_attribute("href")
        result.title = link.inner_text
      end
      div.search("div").each do |abstract|
        next unless abstract.has_attribute?("class") and abstract.get_attribute("class").index("abstr")
        result.content = abstract.inner_text
      end
      @results << result
    end
  end
end

s = SearchYahoo.new("test")
15.times do |i|
  result = s.next_result
  puts i+1
  puts result.title
  puts result.url
  puts result.content
  puts
end

You may also check:How to resolve the algorithm Haversine formula step by step in the ooRexx programming language
You may also check:How to resolve the algorithm Sleep step by step in the PL/I programming language
You may also check:How to resolve the algorithm Long multiplication step by step in the AutoHotkey programming language
You may also check:How to resolve the algorithm Reflection/List properties step by step in the zkl programming language
You may also check:How to resolve the algorithm File size step by step in the Aime programming language