Class: IRB::Irb

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

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

Creates a new irb session



425
426
427
428
429
430
431
432
 
# File 'lib/irb.rb', line 425

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

  @scanner = RubyLex.new
  @scanner.exception_on_syntax_error = false
end

Instance Attribute Details

#context ⇒ Object (readonly)

Returns the current context of this irb session



434
435
436
 
# File 'lib/irb.rb', line 434

def context
  @context
end

#scanner ⇒ Object

The lexer used by this irb session



436
437
438
 
# File 'lib/irb.rb', line 436

def scanner
  @scanner
end

Instance Method Details

#eval_input ⇒ Object

Evaluates input for this session.



439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
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
 
# File 'lib/irb.rb', line 439

def eval_input
  @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
      unless ltype
        ind = prompt(@context.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
  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.each_top_level_statement do |line, line_no|
    signal_status(:IN_EVAL) do
      begin
        line.untaint
        @context.evaluate(line, line_no)
        output_value if @context.echo?
        exc = nil
      rescue Interrupt => exc
      rescue SystemExit, SignalException
        raise
      rescue Exception => exc
      end
      if exc
        print exc.class, ": ", exc, "\n"
        if exc.backtrace && exc.backtrace[0] =~ /irb(2)?(\/.*|-.*|\.rb)?:/ && exc.class.to_s !~ /^IRB/ &&
            !(SyntaxError === exc)
          irb_bug = true
        else
          irb_bug = false
        end

        messages = []
        lasts = []
        levels = 0
        if exc.backtrace
          for m in exc.backtrace
            m = @context.workspace.filter_backtrace(m) unless irb_bug
            if m
              if messages.size < @context.back_trace_limit
                messages.push "\tfrom "+m
              else
                lasts.push "\tfrom "+m
                if lasts.size > @context.back_trace_limit
                  lasts.shift
                  levels += 1
                end
              end
            end
          end
        end
        print messages.join("\n"), "\n"
        unless lasts.empty?
          printf "... %d levels...\n", levels if levels > 0
          print lasts.join("\n")
        end
        print "Maybe IRB bug!\n" if irb_bug
      end
      if $SAFE > 2
        abort "Error: irb does not work for $SAFE level higher than 2"
      end
    end
  end
end

#inspect ⇒ Object

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



666
667
668
669
670
671
672
673
674
675
676
677
678
679
 
# File 'lib/irb.rb', line 666

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 ⇒ Object

:nodoc:



660
661
662
 
# File 'lib/irb.rb', line 660

def output_value # :nodoc:
  printf @context.return_format, @context.inspect_last_value
end

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

:nodoc:



629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
 
# File 'lib/irb.rb', line 629

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 $1
        format("%" + $1 + "d", indent)
      else
        indent.to_s
      end
    when "n"
      if $1
        format("%" + $1 + "d", line_no)
      else
        line_no.to_s
      end
    when "%"
      "%"
    end
  end
  p
end

#signal_handle ⇒ Object

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



595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
 
# File 'lib/irb.rb', line 595

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.



617
618
619
620
621
622
623
624
625
626
627
 
# File 'lib/irb.rb', line 617

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.



585
586
587
588
589
590
591
592
 
# File 'lib/irb.rb', line 585

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.



574
575
576
577
578
579
580
581
582
 
# File 'lib/irb.rb', line 574

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.



544
545
546
547
548
549
550
551
552
553
 
# File 'lib/irb.rb', line 544

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.



560
561
562
563
564
565
566
567
 
# File 'lib/irb.rb', line 560

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