class Inspec::Input::Event

Each time it changes, an Input::Event is added to the #events array.
Information about how the input obtained its value.
TODO: break this out to its own file under inspec/input?

def self.probe_stack 

def self.probe_stack
  frames = caller_locations(2, 40)
  frames.reject! { |f| f.path && f.path.include?("/lib/inspec/") }
  frames.first
end

def diagnostic_string 

def diagnostic_string
  to_h.reject { |_, val| val.nil? }.to_a.map { |pair| "#{pair[0]}: '#{pair[1]}'" }.join(", ")
end

def initialize(properties = {}) 

def initialize(properties = {})
  @value_has_been_set = false
  properties.each do |prop_name, prop_value|
    if EVENT_PROPERTIES.include? prop_name
      # OK, save the property
      send((prop_name.to_s + "=").to_sym, prop_value)
    else
      raise "Unrecognized property to Input::Event: #{prop_name}"
    end
  end
end

def to_h 

def to_h
  EVENT_PROPERTIES.each_with_object({}) do |prop, hash|
    hash[prop] = send(prop)
  end
end

def value=(the_val) 

def value=(the_val)
  # Even if set to nil or false, it has indeed been set; note that fact.
  @value_has_been_set = true
  @value = the_val
end

def value_has_been_set? 

def value_has_been_set?
  @value_has_been_set
end