class VCR::Cassette::ERBRenderer

def binding_for_variables
  @binding_for_variables ||= variables_object.instance_eval { binding }
end

def erb_variables
  @erb if @erb.is_a?(Hash) && !@erb.empty?
end

def handle_name_error(e)
  example_hash = (erb_variables || {}).merge(e.name => 'some value')
  raise Errors::MissingERBVariableError.new(
    "The ERB in the #{@cassette_name} cassette file references undefined variable #{e.name}.  " +
    "Pass it to the cassette using :erb => #{ example_hash.inspect }."
  )
end

def initialize(raw_template, erb, cassette_name=nil)
  @raw_template, @erb, @cassette_name = raw_template, erb, cassette_name
end

def render
  return @raw_template if @raw_template.nil? || !use_erb?
  binding = binding_for_variables if erb_variables
  template.result(binding)
rescue NameError => e
  handle_name_error(e)
end

def template
  @template ||= ERB.new(@raw_template)
end

def use_erb?
  !!@erb
end

def variables_object
  @variables_object ||= @@struct_cache[erb_variables.keys].new(*erb_variables.values)
end