Hosname parts parser

gistfile1.txt

$ rspec -c -fd foo_spec.rb

Hostname
  converts hostnmber to single int
  handles tenths numbered hosts
  handles initial number names
  handles 100ths numbered hosts
  handles no domain
  handled arbitrary dots
  handled dashes
  handles multiple numbers in name
  handled numbered subdomain

Finished in 0.00146 seconds
9 examples, 0 failures

Hostname.rb

#!/bin/env ruby
# simple test of hostname parser
class Hostname
  attr_reader :name, :number, :full_name

  def initialize(hostname)
    parse = hostname.match(/([A-Za-z0-9\-\_]+[A-Za-z\-\_]+)(\d+\b)/).to_a || []
    @full_name = parse.fetch(0, hostname)
    @name      = parse.fetch(1, hostname)
    @number    = parse.fetch(2, hostname).to_i
  end
end

require 'rspec'

describe 'Hostname' do
  it 'converts hostnmber to single int' do
    h = Hostname.new('foo03.foo')
    h.number.should eql 3
    h.name.should eql 'foo'
    h.full_name.should eql 'foo03'
  end

  it 'handles tenths numbered hosts' do
    h = Hostname.new('foo30.foo')
    h.number.should eql 30
    h.name.should eql 'foo'
    h.full_name.should eql 'foo30'
  end

  it 'handles initial number names' do
    h = Hostname.new('33foo30.foo')
    h.number.should eql 30
    h.name.should eql '33foo'
    h.full_name.should eql '33foo30'
  end

  it 'handles 100ths numbered hosts' do
    h = Hostname.new('foo300.foo')
    h.number.should eql 300
    h.name.should eql 'foo'
    h.full_name.should eql 'foo300'
  end

  it 'handles no domain' do
    h = Hostname.new('foo03')
    h.number.should eql 3
    h.name.should eql 'foo'
    h.full_name.should eql 'foo03'

    h = Hostname.new('03')
    h.number.should eql 3
    h.name.should eql '03'
    h.full_name.should eql '03'
  end

  it 'handled arbitrary dots' do
    h = Hostname.new('foo03.a.b.c.d')
    h.number.should eql 3
    h.name.should eql 'foo'
    h.full_name.should eql 'foo03'
  end

  it 'handled dashes' do
    h = Hostname.new('foo-bar03.a.b.c.d')
    h.number.should eql 3
    h.name.should eql 'foo-bar'
    h.full_name.should eql 'foo-bar03'

    h = Hostname.new('foo-03.a.b.c.d')
    h.number.should eql 3
    h.name.should eql 'foo-'
    h.full_name.should eql 'foo-03'
  end

  it 'handles multiple numbers in name' do
    h = Hostname.new('f40foo03')
    h.number.should eql 3
    h.name.should eql 'f40foo'
    h.full_name.should eql 'f40foo03'
  end

  it 'handled numbered subdomain' do
    h = Hostname.new('foo03.a10.b30.c.d')
    h.number.should eql 3
    h.name.should eql 'foo'
    h.full_name.should eql 'foo03'
  end
end