Class: Opal::REPL

Inherits:
Object
  • Object
show all
Defined in:
lib/opal/repl.rb

Defined Under Namespace

Classes: Silencer

Constant Summary collapse

HISTORY_PATH = 
File.expand_path('~/.opal-repl-history')

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ REPL

Returns a new instance of REPL.



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# File 'lib/opal/repl.rb', line 15

def initialize
  @argv = []
  @colorize = true

  begin
    require 'readline'
  rescue LoadError
    abort 'opal-repl depends on readline, which is not currently available'
  end

  begin
    FileUtils.touch(HISTORY_PATH)
  rescue
    nil
  end
  @history = File.exist?(HISTORY_PATH)
end

Instance Attribute Details

#colorize ⇒ Object

Returns the value of attribute colorize.



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# File 'lib/opal/repl.rb', line 13

def colorize
  @colorize
end

Instance Method Details

#eval_ruby(code) ⇒ Object 



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# File 'lib/opal/repl.rb', line 75

def eval_ruby(code)
  builder = Opal::Builder.new
  silencer = Silencer.new

  code = "#{@incomplete}#{code}"
  if code.start_with? 'ls '
    eval_code = code[3..-1]
    mode = :ls
  elsif code == 'ls'
    eval_code = 'self'
    mode = :ls
  elsif code.start_with? 'show '
    eval_code = code[5..-1]
    mode = :show
  else
    eval_code = code
    mode = :inspect
  end

  begin
    silencer.silence do
      builder.build_str(eval_code, '(irb)', irb: true, const_missing: true)
    end
    @incomplete = nil
  rescue Opal::SyntaxError => e
    if LINEBREAKS.include?(e.message)
      @incomplete = "#{code}\n"
    else
      @incomplete = nil
      if silencer.warnings.empty?
        warn e.full_message
      else
        # Most likely a parser error
        warn silencer.warnings
      end
    end
    return
  end
  builder.processed[0...-1].each { |js_code| eval_js(:silent, js_code.to_s) }
  last_processed_file = builder.processed.last.to_s

  if mode == :show
    puts last_processed_file
    return
  end

  eval_js(mode, last_processed_file)
rescue Interrupt, SystemExit => e
  raise e
rescue Exception => e # rubocop:disable Lint/RescueException
  puts e.full_message(highlight: true)
end

#finish ⇒ Object 



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# File 'lib/opal/repl.rb', line 69

def finish
  @pipe.close
rescue
  nil
end

#load_opal ⇒ Object 



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# File 'lib/opal/repl.rb', line 45

def load_opal
  runner = @argv.reject { |i| i == '--repl' }
  runner += ['-e', 'require "opal/repl_js"']
  runner = [RbConfig.ruby, "#{__dir__}/../../exe/opal"] + runner

  @pipe = IO.popen(runner, 'r+',
    # What I try to achieve here: let the runner ignore
    # interrupts. Those should be handled by a supervisor.
    pgroup: true,
    new_pgroup: true,
  )
end

#run(argv = []) ⇒ Object 



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# File 'lib/opal/repl.rb', line 33

def run(argv = [])
  @argv = argv

  savepoint = save_tty
  load_opal
  load_history
  run_input_loop
ensure
  dump_history
  restore_tty(savepoint)
end

#run_input_loop ⇒ Object 



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# File 'lib/opal/repl.rb', line 58

def run_input_loop
  while (line = readline)
    eval_ruby(line)
  end
rescue Interrupt
  @incomplete = nil
  retry
ensure
  finish
end