Parse and compose urls to YouTube and Vimeo videos

gistfile1.rb

module Url
  module Parser
    # Youtube
    YOUTUBE_REGEX = [
      /watch\?v=(?<slug>[A-Za-z0-9_-]+)/,
      /(?:www\.)?youtube\.com\/(?:embed|v)\/(?<slug>[A-Za-z0-9_-]+)/,
      /youtu\.be\/(?<slug>[A-Za-z0-9_-]+)/,
    ]

    # Vimeo
    VIMEO_REGEX = [
      /vimeo\.com\/(?<slug>\d+)/,
      /vimeo\.com\/video\/(?<slug>\d+)/
    ]

    # url or iframe tag
    def self.parse(url)
      if m = Regexp.union(YOUTUBE_REGEX).match(url)
        { slug: m[:slug], type: :youtube }
      elsif m = Regexp.union(VIMEO_REGEX).match(url)
        { slug: m[:slug], type: :vimeo }
      else
        { slug: nil, type: nil }
      end
    end
  end
end

module Url
  module Composer
    def self.compose(parsed_hash)
      case parsed_hash[:type]
      when :youtube
        "//www.youtube.com/embed/#{parsed_hash[:slug]}"
      when :vimeo
        "//player.vimeo.com/video/#{parsed_hash[:slug]}"
      else
        nil
      end
    end
  end
end


describe Url::Parser do
  describe "youtube" do
    context "variant 1" do
      subject { Url::Parser.parse("http://www.youtube.com/watch?v=7kE9W5aULTg") }
      it { should include(slug: "7kE9W5aULTg", type: :youtube) }
    end

    context "variant 2" do
      subject { Url::Parser.parse("watch?v=Eb24RfQ7y3A&feature=related") }
      it { should include(slug: "Eb24RfQ7y3A", type: :youtube) }
    end

    context "variant 3" do
      subject { Url::Parser.parse("http://youtu.be/ccmrXwpEFSI") }
      it { should include(slug: "ccmrXwpEFSI", type: :youtube) }
    end

    context "variant 4" do
      subject { Url::Parser.parse("//www.youtube.com/v/N7_r9wdr15M?hl=en_US&amp;version=3") }
      it { should include(slug: "N7_r9wdr15M", type: :youtube) }
    end

    context "variant 5" do
      subject { Url::Parser.parse("//www.youtube.com/embed/7kE9W5aULTg") }
      it { should include(slug: "7kE9W5aULTg", type: :youtube) }
    end

    context "variant 6" do
      subject { Url::Parser.parse(%q{<iframe width="640" height="360" src="//www.youtube.com/embed/7kE9W5aULTg" frameborder="0" allowfullscreen></iframe>}) }
      it { should include(slug: "7kE9W5aULTg", type: :youtube) }
    end

    context "variant 7" do
      subject { Url::Parser.parse("\nyoutube.com/watch?v=7kE9W5aULTg\n") }
      it { should include(slug: "7kE9W5aULTg", type: :youtube) }
    end
  end

  describe "vimeo" do
    context "variant 1" do
      subject { Url::Parser.parse("http://vimeo.com/76129556") }
      it { should include(slug: "76129556", type: :vimeo) }
    end

    context "variant 2" do
      subject { Url::Parser.parse(%q{<iframe src="//player.vimeo.com/video/76129556" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> <p><a href="http://vimeo.com/76129556">Orgesticulanismus - Mathieu Labaye</a> from <a href="http://vimeo.com/user20885903">Camera-etc</a> on <a href="https://vimeo.com">Vimeo</a>.</p>}) }
      it { should include(slug: "76129556", type: :vimeo) }
    end

    context "variant 3" do
      subject { Url::Parser.parse(%Q{<iframe\nsrc="vimeo.com/video/76129556\n" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe> <p><a href="http://vimeo.com/76129556">Orgesticulanismus - Mathieu Labaye</a> from <a href="http://vimeo.com/user20885903">Camera-etc</a> on <a href="https://vimeo.com">Vimeo</a>.</p>}) }
      it { should include(slug: "76129556", type: :vimeo) }
    end
  end

  describe "unrecognized url" do
    subject { Url::Parser.parse("http://example.com/76129556") }
    it { should include(slug: nil, type: nil) }
  end
end

describe Url::Composer do
  describe "youtube" do
    subject { Url::Composer.compose(slug: "7kE9W5aULTg", type: :youtube) }
    it { should eq "//www.youtube.com/embed/7kE9W5aULTg" }
  end

  describe "vimeo" do
    subject { Url::Composer.compose(slug: "76129556", type: :vimeo) }
    it { should eq "//player.vimeo.com/video/76129556" }
  end

  describe "unrecognized composing" do
    subject { Url::Composer.compose(type: nil, slug: nil) }
    it { should be_nil }
  end
end