module AlexanderGrahamBell

# File lib/alexander_graham_bell.rb, line 14
def tel_href(phone_number)
  phone = Phone.new(phone_number)
  escaped_phone_number = escape_phone_number(phone_number)
  return "tel:#{escaped_phone_number}" unless phone.valid?
  "tel:#{phone.number}#{isub(phone)}"
end

# File lib/alexander_graham_bell.rb, line 7
def tel_link(phone_number)
  phone = Phone.new(phone_number)
  escaped_phone_number = escape_phone_number(phone_number)
  return escaped_phone_number unless phone.valid?
  "<a href=\"#{tel_href(phone_number)}\">#{escaped_phone_number}</a>"
end

# File lib/alexander_graham_bell.rb, line 23
def escape_phone_number(phone_number)
  ERB::Util.h(phone_number)
end

# File lib/alexander_graham_bell.rb, line 27
def isub(phone)
  ";isub=#{phone.extension}" unless phone.extension.nil?
end