Class: ProjectEulerCli::ArchiveViewer

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

Overview

Handles the work of displaying information about the problems.

Instance Method Summary collapse

Constructor Details

#initialize(archive_data) ⇒ ArchiveViewer

Returns a new instance of ArchiveViewer.



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# File 'lib/project_euler_cli/archive_viewer.rb', line 6

def initialize(archive_data)
  @archive_data = archive_data
end

Instance Method Details

#display_custom_page(list) ⇒ Object

Displays a custom page of problems given by an array of IDs.

  • list - Array of problem IDs



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# File 'lib/project_euler_cli/archive_viewer.rb', line 108

def display_custom_page(list)
  puts

  list.each do |id|
    puts "#{id} - #{@archive_data[:problems][id]}"
  end
end

#display_page(page) ⇒ Object

Displays the problem numbers and titles for an individual page of the archive.



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# File 'lib/project_euler_cli/archive_viewer.rb', line 54

def display_page(page)
  load_page(page) unless @archive_data[:visited_pages].include?(page)

  puts

  start = (page - 1) * 50 + 1
  for i in start...start + 50
    unless i >= @archive_data[:num_problems] - 9
      puts "#{i} - #{@archive_data[:problems][i]}"
    end
  end
end

#display_problem(id) ⇒ Object

Displays the details of an individual problem.

  • id - ID of the problem to be displayed



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# File 'lib/project_euler_cli/archive_viewer.rb', line 87

def display_problem(id)
  load_problem_details(id) if @archive_data[:problem_details][id].empty?

  puts
  puts "#{@archive_data[:problems][id]}".upcase
  puts "Problem #{id}"
  puts
  puts @archive_data[:problem_details][id][:published]
  puts @archive_data[:problem_details][id][:solved_by]

  if id < @archive_data[:num_problems] - 9
    puts @archive_data[:problem_details][id][:difficulty]
  end

  puts
  puts "https://projecteuler.net/problem=#{id}"
end

#display_recent ⇒ Object

Displays the 10 most recently added problems.



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# File 'lib/project_euler_cli/archive_viewer.rb', line 27

def display_recent
  load_recent unless @archive_data[:visited_pages].include?(0)

  puts

  (@archive_data[:num_problems]).downto(@archive_data[:num_problems] - 9) do |i|
    puts "#{i} - #{@archive_data[:problems][i]}"
  end
end

#load_page(page) ⇒ Object

Loads the problem numbers and titles for an individual page of the archive.



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# File 'lib/project_euler_cli/archive_viewer.rb', line 38

def load_page(page)
  html = open("https://projecteuler.net/archives;page=#{page}")
  fragment = Nokogiri::HTML(html)

  problem_links = fragment.css('#problems_table td a')

  i = (page - 1) * 50 + 1
  problem_links.each do |link|
    @archive_data[:problems][i] = link.text
    i += 1
  end

  @archive_data[:visited_pages] << page
end

#load_problem_details(id) ⇒ Object

Loads the details of an individual problem.



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# File 'lib/project_euler_cli/archive_viewer.rb', line 68

def load_problem_details(id)
  html = open("https://projecteuler.net/problem=#{id}")
  fragment = Nokogiri::HTML(html)

  problem_info = fragment.css('div#problem_info span span')

  details = problem_info.text.split(';')
  @archive_data[:problem_details][id][:published] = details[0].strip
  @archive_data[:problem_details][id][:solved_by] = details[1].strip

  # recent problems do not have a difficult rating
  if id < @archive_data[:num_problems] - 9
    @archive_data[:problem_details][id][:difficulty] = details[2].strip
  end
end

#load_recent ⇒ Object

Loads in all of the problem numbers and titles from the recent page.



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# File 'lib/project_euler_cli/archive_viewer.rb', line 11

def load_recent
  html = open("https://projecteuler.net/recent")
  fragment = Nokogiri::HTML(html)

  problem_links = fragment.css('#problems_table td a')

  i = @archive_data[:num_problems]
  problem_links.each do |link|
    @archive_data[:problems][i] = link.text
    i -= 1
  end

  @archive_data[:visited_pages] << 0
end