class WebConsole::Evaluator

return a string and will format exception output.
difference of a regular Binding eval is that Evaluator will always
This class wraps a Binding object and evaluates code inside of it. The
Simple Ruby code evaluator.

def eval(input) 

def eval(input)
  # Binding#source_location is available since Ruby 2.6.
  if @binding.respond_to? :source_location
    "=> #{@binding.eval(input, *@binding.source_location).inspect}\n"
  else
    "=> #{@binding.eval(input).inspect}\n"
  end
rescue Exception => exc
  format_exception(exc)
end

def format_exception(exc) 

def format_exception(exc)
  backtrace = cleaner.clean(Array(exc.backtrace) - caller)
  format = "#{exc.class.name}: #{exc}\n".dup
  format << backtrace.map { |trace| "\tfrom #{trace}\n" }.join
  format
end

def initialize(binding = TOPLEVEL_BINDING) 

def initialize(binding = TOPLEVEL_BINDING)
  @binding = binding
end