1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
# 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#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
private
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
end
end
|
