Class: IRB::Irb

Inherits:
Object show all
Defined in:
lib/irb.rb,
lib/irb/ext/multi-irb.rb

Constant Summary collapse

ASSIGNMENT_NODE_TYPES = 
[
  # Local, instance, global, class, constant, instance, and index assignment:
  #   "foo = bar",
  #   "@foo = bar",
  #   "$foo = bar",
  #   "@@foo = bar",
  #   "::Foo = bar",
  #   "a::Foo = bar",
  #   "Foo = bar"
  #   "foo.bar = 1"
  #   "foo[1] = bar"
  :assign,

  # Operation assignment:
  #   "foo += bar"
  #   "foo -= bar"
  #   "foo ||= bar"
  #   "foo &&= bar"
  :opassign,

  # Multiple assignment:
  #   "foo, bar = 1, 2
  :massign,
]
ATTR_TTY = 
"\e[%sm"
ATTR_PLAIN = 
""

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(workspace = nil, input_method = nil) ⇒ Irb

Creates a new irb session



455
456
457
458
459
460
 
# File 'lib/irb.rb', line 455

def initialize(workspace = nil, input_method = nil)
  @context = Context.new(self, workspace, input_method)
  @context.main.extend ExtendCommandBundle
  @signal_status = :IN_IRB
  @scanner = RubyLex.new
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the current context of this irb session



480
481
482
 
# File 'lib/irb.rb', line 480

def context
  @context
end

#scanner ⇒ Object

The lexer used by this irb session



482
483
484
 
# File 'lib/irb.rb', line 482

def scanner
  @scanner
end

Instance Method Details

#assignment_expression?(line) ⇒ Boolean

Returns:

  • (Boolean) 


799
800
801
802
803
804
805
806
807
808
809
810
811
812
 
# File 'lib/irb.rb', line 799

def assignment_expression?(line)
  # Try to parse the line and check if the last of possibly multiple
  # expressions is an assignment type.

  # If the expression is invalid, Ripper.sexp should return nil which will
  # result in false being returned. Any valid expression should return an
  # s-expression where the second selement of the top level array is an
  # array of parsed expressions. The first element of each expression is the
  # expression's type.
  verbose, $VERBOSE = $VERBOSE, nil
  result = ASSIGNMENT_NODE_TYPES.include?(Ripper.sexp(line)&.dig(1,-1,0))
  $VERBOSE = verbose
  result
end

#eval_input ⇒ Object

Evaluates input for this session.



485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
 
# File 'lib/irb.rb', line 485

def eval_input
  exc = nil

  @scanner.set_prompt do
    |ltype, indent, continue, line_no|
    if ltype
      f = @context.prompt_s
    elsif continue
      f = @context.prompt_c
    elsif indent > 0
      f = @context.prompt_n
    else
      f = @context.prompt_i
    end
    f = "" unless f
    if @context.prompting?
      @context.io.prompt = p = prompt(f, ltype, indent, line_no)
    else
      @context.io.prompt = p = ""
    end
    if @context.auto_indent_mode and !@context.io.respond_to?(:auto_indent)
      unless ltype
        prompt_i = @context.prompt_i.nil? ? "" : @context.prompt_i
        ind = prompt(prompt_i, ltype, indent, line_no)[/.*\z/].size +
          indent * 2 - p.size
        ind += 2 if continue
        @context.io.prompt = p + " " * ind if ind > 0
      end
    end
    @context.io.prompt
  end

  @scanner.set_input(@context.io) do
    signal_status(:IN_INPUT) do
      if l = @context.io.gets
        print l if @context.verbose?
      else
        if @context.ignore_eof? and @context.io.readable_after_eof?
          l = "\n"
          if @context.verbose?
            printf "Use \"exit\" to leave %s\n", @context.ap_name
          end
        else
          print "\n"
        end
      end
      l
    end
  end

  @scanner.set_auto_indent(@context) if @context.auto_indent_mode

  @scanner.each_top_level_statement do |line, line_no|
    signal_status(:IN_EVAL) do
      begin
        line.untaint if RUBY_VERSION < '2.7'
        @context.evaluate(line, line_no, exception: exc)
        if @context.echo?
          if assignment_expression?(line)
            if @context.echo_on_assignment?
              output_value(@context.echo_on_assignment? == :truncate)
            end
          else
            output_value
          end
        end
      rescue Interrupt => exc
      rescue SystemExit, SignalException
        raise
      rescue Exception => exc
      else
        exc = nil
        next
      end
      handle_exception(exc)
    end
  end
end

#handle_exception(exc) ⇒ Object 



564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
 
# File 'lib/irb.rb', line 564

def handle_exception(exc)
  if exc.backtrace && exc.backtrace[0] =~ /\/irb(2)?(\/.*|-.*|\.rb)?:/ && exc.class.to_s !~ /^IRB/ &&
     !(SyntaxError === exc) && !(EncodingError === exc)
    # The backtrace of invalid encoding hash (ex. {"\xAE": 1}) raises EncodingError without lineno.
    irb_bug = true
  else
    irb_bug = false
  end

  if STDOUT.tty?
    attr = ATTR_TTY
    print "#{attr[1]}Traceback#{attr[]} (most recent call last):\n"
  else
    attr = ATTR_PLAIN
  end
  messages = []
  lasts = []
  levels = 0
  if exc.backtrace
    count = 0
    exc.backtrace.each do |m|
      m = @context.workspace.filter_backtrace(m) or next unless irb_bug
      count += 1
      if attr == ATTR_TTY
        m = sprintf("%9d: from %s", count, m)
      else
        m = "\tfrom #{m}"
      end
      if messages.size < @context.back_trace_limit
        messages.push(m)
      elsif lasts.size < @context.back_trace_limit
        lasts.push(m).shift
        levels += 1
      end
    end
  end
  if attr == ATTR_TTY
    unless lasts.empty?
      puts lasts.reverse
      printf "... %d levels...\n", levels if levels > 0
    end
    puts messages.reverse
  end
  m = exc.to_s.split(/\n/)
  print "#{attr[1]}#{exc.class} (#{attr[4]}#{m.shift}#{attr[0, 1]})#{attr[]}\n"
  puts m.map {|s| "#{attr[1]}#{s}#{attr[]}\n"}
  if attr == ATTR_PLAIN
    puts messages
    unless lasts.empty?
      puts lasts
      printf "... %d levels...\n", levels if levels > 0
    end
  end
  print "Maybe IRB bug!\n" if irb_bug
end

#inspect ⇒ Object

Outputs the local variables to this current session, including #signal_status and #context, using IRB::Locale.



784
785
786
787
788
789
790
791
792
793
794
795
796
797
 
# File 'lib/irb.rb', line 784

def inspect
  ary = []
  for iv in instance_variables
    case (iv = iv.to_s)
    when "@signal_status"
      ary.push format("%s=:%s", iv, @signal_status.id2name)
    when "@context"
      ary.push format("%s=%s", iv, eval(iv).__to_s__)
    else
      ary.push format("%s=%s", iv, eval(iv))
    end
  end
  format("#<%s: %s>", self.class, ary.join(", "))
end

#output_value(omit = false) ⇒ Object

:nodoc:



749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
 
# File 'lib/irb.rb', line 749

def output_value(omit = false) # :nodoc:
  str = @context.inspect_last_value
  multiline_p = str.include?("\n")
  if omit
    winwidth = @context.io.winsize.last
    if multiline_p
      first_line = str.split("\n").first
      result = @context.newline_before_multiline_output? ? (@context.return_format % first_line) : first_line
      output_width = Reline::Unicode.calculate_width(result, true)
      diff_size = output_width - Reline::Unicode.calculate_width(first_line, true)
      if diff_size.positive? and output_width > winwidth
        lines, _ = Reline::Unicode.split_by_width(first_line, winwidth - diff_size - 3)
        str = "%s...\e[0m" % lines.first
        multiline_p = false
      else
        str.gsub!(/(\A.*?\n).*/m, "\\1...")
      end
    else
      output_width = Reline::Unicode.calculate_width(@context.return_format % str, true)
      diff_size = output_width - Reline::Unicode.calculate_width(str, true)
      if diff_size.positive? and output_width > winwidth
        lines, _ = Reline::Unicode.split_by_width(str, winwidth - diff_size - 3)
        str = "%s...\e[0m" % lines.first
      end
    end
  end
  if multiline_p && @context.newline_before_multiline_output?
    printf @context.return_format, "\n#{str}"
  else
    printf @context.return_format, str
  end
end

#prompt(prompt, ltype, indent, line_no) ⇒ Object

:nodoc:



710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
 
# File 'lib/irb.rb', line 710

def prompt(prompt, ltype, indent, line_no) # :nodoc:
  p = prompt.dup
  p.gsub!(/%([0-9]+)?([a-zA-Z])/) do
    case $2
    when "N"
      @context.irb_name
    when "m"
      @context.main.to_s
    when "M"
      @context.main.inspect
    when "l"
      ltype
    when "i"
      if indent < 0
        if $1
          "-".rjust($1.to_i)
        else
          "-"
        end
      else
        if $1
          format("%" + $1 + "d", indent)
        else
          indent.to_s
        end
      end
    when "n"
      if $1
        format("%" + $1 + "d", line_no)
      else
        line_no.to_s
      end
    when "%"
      "%"
    end
  end
  p
end

#run(conf = IRB.conf) ⇒ Object 



462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
 
# File 'lib/irb.rb', line 462

def run(conf = IRB.conf)
  conf[:IRB_RC].call(context) if conf[:IRB_RC]
  conf[:MAIN_CONTEXT] = context

  trap("SIGINT") do
    signal_handle
  end

  begin
    catch(:IRB_EXIT) do
      eval_input
    end
  ensure
    conf[:AT_EXIT].each{|hook| hook.call}
  end
end

#signal_handle ⇒ Object

Handler for the signal SIGINT, see Kernel#trap for more information.



676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
 
# File 'lib/irb.rb', line 676

def signal_handle
  unless @context.ignore_sigint?
    print "\nabort!\n" if @context.verbose?
    exit
  end

  case @signal_status
  when :IN_INPUT
    print "^C\n"
    raise RubyLex::TerminateLineInput
  when :IN_EVAL
    IRB.irb_abort(self)
  when :IN_LOAD
    IRB.irb_abort(self, LoadAbort)
  when :IN_IRB
    # ignore
  else
    # ignore other cases as well
  end
end

#signal_status(status) ⇒ Object

Evaluates the given block using the given status.



698
699
700
701
702
703
704
705
706
707
708
 
# File 'lib/irb.rb', line 698

def signal_status(status)
  return yield if @signal_status == :IN_LOAD

  signal_status_back = @signal_status
  @signal_status = status
  begin
    yield
  ensure
    @signal_status = signal_status_back
  end
end

#suspend_context(context) ⇒ Object

Evaluates the given block using the given context as the Context.



666
667
668
669
670
671
672
673
 
# File 'lib/irb.rb', line 666

def suspend_context(context)
  @context, back_context = context, @context
  begin
    yield back_context
  ensure
    @context = back_context
  end
end

#suspend_input_method(input_method) ⇒ Object

Evaluates the given block using the given input_method as the Context#io.

Used by the irb commands source and irb_load, see IRB@IRB+Sessions for more information.



655
656
657
658
659
660
661
662
663
 
# File 'lib/irb.rb', line 655

def suspend_input_method(input_method)
  back_io = @context.io
  @context.instance_eval{@io = input_method}
  begin
    yield back_io
  ensure
    @context.instance_eval{@io = back_io}
  end
end

#suspend_name(path = nil, name = nil) ⇒ Object

Evaluates the given block using the given path as the Context#irb_path and name as the Context#irb_name.

Used by the irb command source, see IRB@IRB+Sessions for more information.



625
626
627
628
629
630
631
632
633
634
 
# File 'lib/irb.rb', line 625

def suspend_name(path = nil, name = nil)
  @context.irb_path, back_path = path, @context.irb_path if path
  @context.irb_name, back_name = name, @context.irb_name if name
  begin
    yield back_path, back_name
  ensure
    @context.irb_path = back_path if path
    @context.irb_name = back_name if name
  end
end

#suspend_workspace(workspace) ⇒ Object

Evaluates the given block using the given workspace as the Context#workspace.

Used by the irb command irb_load, see IRB@IRB+Sessions for more information.



641
642
643
644
645
646
647
648
 
# File 'lib/irb.rb', line 641

def suspend_workspace(workspace)
  @context.workspace, back_workspace = workspace, @context.workspace
  begin
    yield back_workspace
  ensure
    @context.workspace = back_workspace
  end
end