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Bug #17160 ยป evaluator.rb

Modified evaluator.rb from web-console. - vo.x (Vit Ondruch), 09/07/2020 01:15 PM

 
# frozen_string_literal: true

module WebConsole
# Simple Ruby code evaluator.
#
# This class wraps a +Binding+ object and evaluates code inside of it. The
# difference of a regular +Binding+ eval is that +Evaluator+ will always
# return a string and will format exception output.
class Evaluator
# Cleanses exceptions raised inside #eval.
cattr_reader :cleaner, default: begin
cleaner = ActiveSupport::BacktraceCleaner.new
cleaner.add_silencer { |line| line.start_with?(File.expand_path("..", __FILE__)) }
cleaner
end

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

def eval(input)
"=> #{@binding.eval(input).inspect}\n"
rescue Exception => exc
format_exception(exc)
end

private

def format_exception(exc)
puts "# exc.backtrace #"
puts exc.backtrace
puts "# caller #"
puts caller

backtrace = cleaner.clean(Array(exc.backtrace) - caller)

format = "#{exc.class.name}: #{exc}\n".dup
format << backtrace.map { |trace| "\tfrom #{trace}\n" }.join
format
end
end
end
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