Class: Euler::Problem

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

Overview

This class represents a project Euler problem.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Problem

Given a hash with symbol keys initialize the problem using the :id, :name, url, and :content keys.



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# File 'lib/euler/problem.rb', line 24

def initialize options
  @id      = options[:id]
  @name    = options[:name]
  @url     = options[:url]
  @content = options[:content]
end

Instance Attribute Details

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/euler/problem.rb', line 20

def id
  @id
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/euler/problem.rb', line 20

def name
  @name
end

#url ⇒ Object (readonly)

Returns the value of attribute url.



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# File 'lib/euler/problem.rb', line 20

def url
  @url
end

Class Method Details

.find(id) ⇒ Object

Returns the problem with the given id.



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# File 'lib/euler/problem.rb', line 10

def self.find id
  problem_spec_file = "#{Euler.problems_dir}/#{id}.yml"
  begin
    problem_spec    = YAML.load_file(problem_spec_file)
  rescue
    raise "No problem with id '#{id}' found"
  end
  Problem.new(problem_spec)
end

Instance Method Details

#answer ⇒ Object

Returns this problem’s answer.



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# File 'lib/euler/problem.rb', line 47

def answer
  @@answers ||= YAML.load_file(Euler.answers_file)
  @@answers[id].to_s
end

#content ⇒ Object

Passing content though an ultra simple template engine before returning it



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# File 'lib/euler/problem.rb', line 37

def content
  @content.gsub(/\{\{\s?images_dir\s?\}\}/, Euler.images_dir)
end

#has_answer? ⇒ Boolean

Returns true if this problem has an answer.

Returns:

  • (Boolean) 


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# File 'lib/euler/problem.rb', line 42

def has_answer?
  not answer.empty?
end

#template ⇒ Object

Content without going through the template engine



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# File 'lib/euler/problem.rb', line 32

def template
  @content
end

#to_hash ⇒ Object

Converts the problem to a hash.



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# File 'lib/euler/problem.rb', line 53

def to_hash
  {
    id:       id,
    name:     name,
    url:      url,
    content:  template
  }
end

#to_s ⇒ Object 



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# File 'lib/euler/problem.rb', line 67

def to_s
  "##{id} - #{name}"
end

#to_yaml ⇒ Object

Converts the problem to YAML.



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# File 'lib/euler/problem.rb', line 63

def to_yaml
  to_hash.to_yaml
end