class Sprockets::ERBTemplate

def self.call(input)
  new.call(input)
end

def call(input)
  engine = ::ERB.new(input[:data], nil, '<>')
  context = input[:environment].context_class.new(input)
  klass = (class << context; self; end)
  klass.class_eval(&@block) if @block
  engine.def_method(klass, :_evaluate_template, input[:filename])
  data = context._evaluate_template
  context.metadata.merge(data: data)
end

def initialize(&block)
  @block = block
end