class Sprockets::ERBProcessor

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

def self.instance
  @instance ||= new
end

def call(input)
  if keyword_constructor? # Ruby 2.6+
    engine = ::ERB.new(input[:data], trim_mode: '<>')
  else
    engine = ::ERB.new(input[:data], nil, '<>')
  end
  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

def keyword_constructor?
  return @keyword_constructor if defined? @keyword_constructor
  @keyword_constructor = ::ERB.instance_method(:initialize).parameters.include?([:key, :trim_mode])
end