Class: RubyLex

Inherits:
Object show all
Defined in:
lib/irb/ruby-lex.rb

Overview

:stopdoc:

Defined Under Namespace

Classes: TerminateLineInput

Constant Summary collapse

ERROR_TOKENS = 
[
  :on_parse_error,
  :compile_error,
  :on_assign_error,
  :on_alias_error,
  :on_class_name_error,
  :on_param_error
]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ RubyLex

Returns a new instance of RubyLex.



25
26
27
28
29
30
31
 
# File 'lib/irb/ruby-lex.rb', line 25

def initialize
  @exp_line_no = @line_no = 1
  @indent = 0
  @continue = false
  @line = ""
  @prompt = nil
end

Class Method Details

.compile_with_errors_suppressed(code, line_no: 1) ⇒ Object 



33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
 
# File 'lib/irb/ruby-lex.rb', line 33

def self.compile_with_errors_suppressed(code, line_no: 1)
  begin
    result = yield code, line_no
  rescue ArgumentError
    # Ruby can issue an error for the code if there is an
    # incomplete magic comment for encoding in it. Force an
    # expression with a new line before the code in this
    # case to prevent magic comment handling.  To make sure
    # line numbers in the lexed code remain the same,
    # decrease the line number by one.
    code = ";\n#{code}"
    line_no -= 1
    result = yield code, line_no
  end
  result
end

.ripper_lex_without_warning(code, context: nil) ⇒ Object 



139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
 
# File 'lib/irb/ruby-lex.rb', line 139

def self.ripper_lex_without_warning(code, context: nil)
  verbose, $VERBOSE = $VERBOSE, nil
  if context
    lvars = context.workspace&.binding&.local_variables
    if lvars && !lvars.empty?
      code = "#{lvars.join('=')}=nil\n#{code}"
      line_no = 0
    else
      line_no = 1
    end
  end

  compile_with_errors_suppressed(code, line_no: line_no) do |inner_code, line_no|
    lexer = Ripper::Lexer.new(inner_code, '-', line_no)
    if lexer.respond_to?(:scan) # Ruby 2.7+
      lexer.scan.each_with_object([]) do |t, tokens|
        next if t.pos.first == 0
        prev_tk = tokens.last
        position_overlapped = prev_tk && t.pos[0] == prev_tk.pos[0] && t.pos[1] < prev_tk.pos[1] + prev_tk.tok.bytesize
        if position_overlapped
          tokens[-1] = t if ERROR_TOKENS.include?(prev_tk.event) && !ERROR_TOKENS.include?(t.event)
        else
          tokens << t
        end
      end
    else
      lexer.parse.reject { |it| it.pos.first == 0 }
    end
  end
ensure
  $VERBOSE = verbose
end

Instance Method Details

#check_code_block(code, tokens = @tokens) ⇒ Object 



308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
 
# File 'lib/irb/ruby-lex.rb', line 308

def check_code_block(code, tokens = @tokens)
  return true if tokens.empty?
  if tokens.last.event == :on_heredoc_beg
    return true
  end

  begin # check if parser error are available
    verbose, $VERBOSE = $VERBOSE, nil
    case RUBY_ENGINE
    when 'ruby'
      self.class.compile_with_errors_suppressed(code) do |inner_code, line_no|
        RubyVM::InstructionSequence.compile(inner_code, nil, nil, line_no)
      end
    when 'jruby'
      JRuby.compile_ir(code)
    else
      catch(:valid) do
        eval("BEGIN { throw :valid, true }\n#{code}")
        false
      end
    end
  rescue EncodingError
    # This is for a hash with invalid encoding symbol, {"\xAE": 1}
  rescue SyntaxError => e
    case e.message
    when /unterminated (?:string|regexp) meets end of file/
      # "unterminated regexp meets end of file"
      #
      #   example:
      #     /
      #
      # "unterminated string meets end of file"
      #
      #   example:
      #     '
      return true
    when /syntax error, unexpected end-of-input/
      # "syntax error, unexpected end-of-input, expecting keyword_end"
      #
      #   example:
      #     if true
      #       hoge
      #       if false
      #         fuga
      #       end
      return true
    when /syntax error, unexpected keyword_end/
      # "syntax error, unexpected keyword_end"
      #
      #   example:
      #     if (
      #     end
      #
      #   example:
      #     end
      return false
    when /syntax error, unexpected '\.'/
      # "syntax error, unexpected '.'"
      #
      #   example:
      #     .
      return false
    when /unexpected tREGEXP_BEG/
      # "syntax error, unexpected tREGEXP_BEG, expecting keyword_do or '{' or '('"
      #
      #   example:
      #     method / f /
      return false
    end
  ensure
    $VERBOSE = verbose
  end

  last_lex_state = tokens.last.state

  if last_lex_state.allbits?(Ripper::EXPR_BEG)
    return false
  elsif last_lex_state.allbits?(Ripper::EXPR_DOT)
    return true
  elsif last_lex_state.allbits?(Ripper::EXPR_CLASS)
    return true
  elsif last_lex_state.allbits?(Ripper::EXPR_FNAME)
    return true
  elsif last_lex_state.allbits?(Ripper::EXPR_VALUE)
    return true
  elsif last_lex_state.allbits?(Ripper::EXPR_ARG)
    return false
  end

  false
end

#check_corresponding_token_depth(lines, line_index) ⇒ Object 



597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
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
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
 
# File 'lib/irb/ruby-lex.rb', line 597

def check_corresponding_token_depth(lines, line_index)
  corresponding_token_depth = nil
  is_first_spaces_of_line = true
  is_first_printable_of_line = true
  spaces_of_nest = []
  spaces_at_line_head = 0
  open_brace_on_line = 0
  in_oneliner_def = nil

  if heredoc_scope?
    return lines[line_index][/^ */].length
  end

  @tokens.each_with_index do |t, index|
    # detecting one-liner method definition
    if in_oneliner_def.nil?
      if t.state.allbits?(Ripper::EXPR_ENDFN)
        in_oneliner_def = :ENDFN
      end
    else
      if t.state.allbits?(Ripper::EXPR_ENDFN)
        # continuing
      elsif t.state.allbits?(Ripper::EXPR_BEG)
        if t.tok == '='
          in_oneliner_def = :BODY
        end
      else
        if in_oneliner_def == :BODY
          # one-liner method definition
          if is_first_printable_of_line
            corresponding_token_depth = spaces_of_nest.pop
          else
            spaces_of_nest.pop
            corresponding_token_depth = nil
          end
        end
        in_oneliner_def = nil
      end
    end

    case t.event
    when :on_ignored_nl, :on_nl, :on_comment
      if in_oneliner_def != :BODY
        corresponding_token_depth = nil
        spaces_at_line_head = 0
        is_first_spaces_of_line = true
        is_first_printable_of_line = true
        open_brace_on_line = 0
      end
      next
    when :on_sp
      spaces_at_line_head = t.tok.count(' ') if is_first_spaces_of_line
      is_first_spaces_of_line = false
      next
    end

    case t.event
    when :on_lbracket, :on_lbrace, :on_lparen, :on_tlambeg
      spaces_of_nest.push(spaces_at_line_head + open_brace_on_line * 2)
      open_brace_on_line += 1
    when :on_rbracket, :on_rbrace, :on_rparen
      if is_first_printable_of_line
        corresponding_token_depth = spaces_of_nest.pop
      else
        spaces_of_nest.pop
        corresponding_token_depth = nil
      end
      open_brace_on_line -= 1
    when :on_kw
      next if index > 0 and @tokens[index - 1].state.allbits?(Ripper::EXPR_FNAME)
      case t.tok
      when 'do'
        syntax_of_do = take_corresponding_syntax_to_kw_do(@tokens, index)
        if syntax_of_do == :method_calling
          spaces_of_nest.push(spaces_at_line_head)
        end
      when 'def', 'case', 'for', 'begin', 'class', 'module'
        spaces_of_nest.push(spaces_at_line_head)
      when 'rescue'
        unless t.state.allbits?(Ripper::EXPR_LABEL)
          corresponding_token_depth = spaces_of_nest.last
        end
      when 'if', 'unless', 'while', 'until'
        # postfix if/unless/while/until must be Ripper::EXPR_LABEL
        unless t.state.allbits?(Ripper::EXPR_LABEL)
          spaces_of_nest.push(spaces_at_line_head)
        end
      when 'else', 'elsif', 'ensure', 'when'
        corresponding_token_depth = spaces_of_nest.last
      when 'in'
        if in_keyword_case_scope?
          corresponding_token_depth = spaces_of_nest.last
        end
      when 'end'
        if is_first_printable_of_line
          corresponding_token_depth = spaces_of_nest.pop
        else
          spaces_of_nest.pop
          corresponding_token_depth = nil
        end
      end
    end
    is_first_spaces_of_line = false
    is_first_printable_of_line = false
  end
  corresponding_token_depth
end

#check_newline_depth_difference ⇒ Object 



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
563
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
 
# File 'lib/irb/ruby-lex.rb', line 527

def check_newline_depth_difference
  depth_difference = 0
  open_brace_on_line = 0
  in_oneliner_def = nil
  @tokens.each_with_index do |t, index|
    # detecting one-liner method definition
    if in_oneliner_def.nil?
      if t.state.allbits?(Ripper::EXPR_ENDFN)
        in_oneliner_def = :ENDFN
      end
    else
      if t.state.allbits?(Ripper::EXPR_ENDFN)
        # continuing
      elsif t.state.allbits?(Ripper::EXPR_BEG)
        if t.tok == '='
          in_oneliner_def = :BODY
        end
      else
        if in_oneliner_def == :BODY
          # one-liner method definition
          depth_difference -= 1
        end
        in_oneliner_def = nil
      end
    end

    case t.event
    when :on_ignored_nl, :on_nl, :on_comment
      if index != (@tokens.size - 1) and in_oneliner_def != :BODY
        depth_difference = 0
        open_brace_on_line = 0
      end
      next
    when :on_sp
      next
    end

    case t.event
    when :on_lbracket, :on_lbrace, :on_lparen, :on_tlambeg
      depth_difference += 1
      open_brace_on_line += 1
    when :on_rbracket, :on_rbrace, :on_rparen
      depth_difference -= 1 if open_brace_on_line > 0
    when :on_kw
      next if index > 0 and @tokens[index - 1].state.allbits?(Ripper::EXPR_FNAME)
      case t.tok
      when 'do'
        syntax_of_do = take_corresponding_syntax_to_kw_do(@tokens, index)
        depth_difference += 1 if syntax_of_do == :method_calling
      when 'def', 'case', 'for', 'begin', 'class', 'module'
        depth_difference += 1
      when 'if', 'unless', 'while', 'until', 'rescue'
        # postfix if/unless/while/until/rescue must be Ripper::EXPR_LABEL
        unless t.state.allbits?(Ripper::EXPR_LABEL)
          depth_difference += 1
        end
      when 'else', 'elsif', 'ensure', 'when'
        depth_difference += 1
      when 'in'
        unless is_the_in_correspond_to_a_for(@tokens, index)
          depth_difference += 1
        end
      when 'end'
        depth_difference -= 1
      end
    end
  end
  depth_difference
end

#check_state(code, tokens = nil, context: nil) ⇒ Object 



212
213
214
215
216
217
218
219
 
# File 'lib/irb/ruby-lex.rb', line 212

def check_state(code, tokens = nil, context: nil)
  tokens = self.class.ripper_lex_without_warning(code, context: context) unless tokens
  ltype = process_literal_type(tokens)
  indent = process_nesting_level(tokens)
  continue = process_continue(tokens)
  code_block_open = check_code_block(code, tokens)
  [ltype, indent, continue, code_block_open]
end

#check_string_literal(tokens) ⇒ Object 



705
706
707
708
709
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
 
# File 'lib/irb/ruby-lex.rb', line 705

def check_string_literal(tokens)
  i = 0
  start_token = []
  end_type = []
  while i < tokens.size
    t = tokens[i]
    case t.event
    when *end_type.last
      start_token.pop
      end_type.pop
    when :on_tstring_beg
      start_token << t
      end_type << [:on_tstring_end, :on_label_end]
    when :on_regexp_beg
      start_token << t
      end_type << :on_regexp_end
    when :on_symbeg
      acceptable_single_tokens = %i{on_ident on_const on_op on_cvar on_ivar on_gvar on_kw on_int on_backtick}
      if (i + 1) < tokens.size
        if acceptable_single_tokens.all?{ |st| tokens[i + 1].event != st }
          start_token << t
          end_type << :on_tstring_end
        else
          i += 1
        end
      end
    when :on_backtick
      start_token << t
      end_type << :on_tstring_end
    when :on_qwords_beg, :on_words_beg, :on_qsymbols_beg, :on_symbols_beg
      start_token << t
      end_type << :on_tstring_end
    when :on_heredoc_beg
      start_token << t
      end_type << :on_heredoc_end
    end
    i += 1
  end
  start_token.last.nil? ? nil : start_token.last
end

#check_termination_in_prev_line(code, context: nil) ⇒ Object 



779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
 
# File 'lib/irb/ruby-lex.rb', line 779

def check_termination_in_prev_line(code, context: nil)
  tokens = self.class.ripper_lex_without_warning(code, context: context)
  past_first_newline = false
  index = tokens.rindex do |t|
    # traverse first token before last line
    if past_first_newline
      if t.tok.include?("\n")
        true
      end
    elsif t.tok.include?("\n")
      past_first_newline = true
      false
    else
      false
    end
  end

  if index
    first_token = nil
    last_line_tokens = tokens[(index + 1)..(tokens.size - 1)]
    last_line_tokens.each do |t|
      unless [:on_sp, :on_ignored_sp, :on_comment].include?(t.event)
        first_token = t
        break
      end
    end

    if first_token.nil?
      return false
    elsif first_token && first_token.state == Ripper::EXPR_DOT
      return false
    else
      tokens_without_last_line = tokens[0..index]
      ltype = process_literal_type(tokens_without_last_line)
      indent = process_nesting_level(tokens_without_last_line)
      continue = process_continue(tokens_without_last_line)
      code_block_open = check_code_block(tokens_without_last_line.map(&:tok).join(''), tokens_without_last_line)
      if ltype or indent > 0 or continue or code_block_open
        return false
      else
        return last_line_tokens.map(&:tok).join('')
      end
    end
  end
  false
end

#each_top_level_statement ⇒ Object 



236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
 
# File 'lib/irb/ruby-lex.rb', line 236

def each_top_level_statement
  initialize_input
  catch(:TERM_INPUT) do
    loop do
      begin
        prompt
        unless l = lex
          throw :TERM_INPUT if @line == ''
        else
          @line_no += l.count("\n")
          if l == "\n"
            @exp_line_no += 1
            next
          end
          @line.concat l
          if @code_block_open or @ltype or @continue or @indent > 0
            next
          end
        end
        if @line != "\n"
          @line.force_encoding(@io.encoding)
          yield @line, @exp_line_no
        end
        raise TerminateLineInput if @io.eof?
        @line = ''
        @exp_line_no = @line_no

        @indent = 0
      rescue TerminateLineInput
        initialize_input
        prompt
      end
    end
  end
end

#find_prev_spaces(line_index) ⇒ Object 



172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
 
# File 'lib/irb/ruby-lex.rb', line 172

def find_prev_spaces(line_index)
  return 0 if @tokens.size == 0
  md = @tokens[0].tok.match(/(\A +)/)
  prev_spaces = md.nil? ? 0 : md[1].count(' ')
  line_count = 0
  @tokens.each_with_index do |t, i|
    if t.tok.include?("\n")
      line_count += t.tok.count("\n")
      if line_count >= line_index
        return prev_spaces
      end
      if (@tokens.size - 1) > i
        md = @tokens[i + 1].tok.match(/(\A +)/)
        prev_spaces = md.nil? ? 0 : md[1].count(' ')
      end
    end
  end
  prev_spaces
end

#initialize_input ⇒ Object 



227
228
229
230
231
232
233
234
 
# File 'lib/irb/ruby-lex.rb', line 227

def initialize_input
  @ltype = nil
  @indent = 0
  @continue = false
  @line = ""
  @exp_line_no = @line_no
  @code_block_open = false
end

#is_method_calling?(tokens, index) ⇒ Boolean

Returns:

  • (Boolean) 


450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
 
# File 'lib/irb/ruby-lex.rb', line 450

def is_method_calling?(tokens, index)
  tk = tokens[index]
  if tk.state.anybits?(Ripper::EXPR_CMDARG) and tk.event == :on_ident
    # The target method call to pass the block with "do".
    return true
  elsif tk.state.anybits?(Ripper::EXPR_ARG) and tk.event == :on_ident
    non_sp_index = tokens[0..(index - 1)].rindex{ |t| t.event != :on_sp }
    if non_sp_index
      prev_tk = tokens[non_sp_index]
      if prev_tk.state.anybits?(Ripper::EXPR_DOT) and prev_tk.event == :on_period
        # The target method call with receiver to pass the block with "do".
        return true
      end
    end
  end
  false
end

#is_the_in_correspond_to_a_for(tokens, index) ⇒ Object 



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
 
# File 'lib/irb/ruby-lex.rb', line 499

def is_the_in_correspond_to_a_for(tokens, index)
  syntax_of_in = nil
  # Finding a syntax corresponding to "do".
  index.downto(0) do |i|
    tk = tokens[i]
    # In "continue", the token isn't the corresponding syntax to "do".
    non_sp_index = tokens[0..(i - 1)].rindex{ |t| t.event != :on_sp }
    first_in_fomula = false
    if non_sp_index.nil?
      first_in_fomula = true
    elsif [:on_ignored_nl, :on_nl, :on_comment].include?(tokens[non_sp_index].event)
      first_in_fomula = true
    end
    if tk.event == :on_kw && tk.tok == 'for'
      # A loop syntax in front of "do" found.
      #
      #   while cond do # also "until" or "for"
      #   end
      #
      # This "do" doesn't increment indent because the loop syntax already
      # incremented.
      syntax_of_in = :for
    end
    break if first_in_fomula
  end
  syntax_of_in
end

#lex ⇒ Object 



272
273
274
275
276
277
278
279
280
281
282
283
284
285
 
# File 'lib/irb/ruby-lex.rb', line 272

def lex
  line = @input.call
  if @io.respond_to?(:check_termination)
    return line # multiline
  end
  code = @line + (line.nil? ? '' : line)
  code.gsub!(/\s*\z/, '').concat("\n")
  @tokens = self.class.ripper_lex_without_warning(code)
  @continue = process_continue
  @code_block_open = check_code_block(code)
  @indent = process_nesting_level
  @ltype = process_literal_type
  line
end

#process_continue(tokens = @tokens) ⇒ Object 



287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
 
# File 'lib/irb/ruby-lex.rb', line 287

def process_continue(tokens = @tokens)
  # last token is always newline
  if tokens.size >= 2 and tokens[-2].event == :on_regexp_end
    # end of regexp literal
    return false
  elsif tokens.size >= 2 and tokens[-2].event == :on_semicolon
    return false
  elsif tokens.size >= 2 and tokens[-2].event == :on_kw and ['begin', 'else', 'ensure'].include?(tokens[-2].tok)
    return false
  elsif !tokens.empty? and tokens.last.tok == "\\\n"
    return true
  elsif tokens.size >= 1 and tokens[-1].event == :on_heredoc_end # "EOH\n"
    return false
  elsif tokens.size >= 2 and tokens[-2].state.anybits?(Ripper::EXPR_BEG | Ripper::EXPR_FNAME) and tokens[-2].tok !~ /\A\.\.\.?\z/
    # end of literal except for regexp
    # endless range at end of line is not a continue
    return true
  end
  false
end

#process_literal_type(tokens = @tokens) ⇒ Object 



746
747
748
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
 
# File 'lib/irb/ruby-lex.rb', line 746

def process_literal_type(tokens = @tokens)
  start_token = check_string_literal(tokens)
  return nil if start_token == ""

  case start_token&.event
  when :on_tstring_beg
    case start_token&.tok
    when ?"      then ?"
    when /^%.$/  then ?"
    when /^%Q.$/ then ?"
    when ?'      then ?'
    when /^%q.$/ then ?'
    end
  when :on_regexp_beg   then ?/
  when :on_symbeg       then ?:
  when :on_backtick     then ?`
  when :on_qwords_beg   then ?]
  when :on_words_beg    then ?]
  when :on_qsymbols_beg then ?]
  when :on_symbols_beg  then ?]
  when :on_heredoc_beg
    start_token&.tok =~ /<<[-~]?(['"`])[_a-zA-Z0-9]+\1/
    case $1
    when ?" then ?"
    when ?' then ?'
    when ?` then ?`
    else         ?"
    end
  else
    nil
  end
end

#process_nesting_level(tokens = @tokens) ⇒ Object 



400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
 
# File 'lib/irb/ruby-lex.rb', line 400

def process_nesting_level(tokens = @tokens)
  indent = 0
  in_oneliner_def = nil
  tokens.each_with_index { |t, index|
    # detecting one-liner method definition
    if in_oneliner_def.nil?
      if t.state.allbits?(Ripper::EXPR_ENDFN)
        in_oneliner_def = :ENDFN
      end
    else
      if t.state.allbits?(Ripper::EXPR_ENDFN)
        # continuing
      elsif t.state.allbits?(Ripper::EXPR_BEG)
        if t.tok == '='
          in_oneliner_def = :BODY
        end
      else
        if in_oneliner_def == :BODY
          # one-liner method definition
          indent -= 1
        end
        in_oneliner_def = nil
      end
    end

    case t.event
    when :on_lbracket, :on_lbrace, :on_lparen, :on_tlambeg
      indent += 1
    when :on_rbracket, :on_rbrace, :on_rparen
      indent -= 1
    when :on_kw
      next if index > 0 and tokens[index - 1].state.allbits?(Ripper::EXPR_FNAME)
      case t.tok
      when 'do'
        syntax_of_do = take_corresponding_syntax_to_kw_do(tokens, index)
        indent += 1 if syntax_of_do == :method_calling
      when 'def', 'case', 'for', 'begin', 'class', 'module'
        indent += 1
      when 'if', 'unless', 'while', 'until'
        # postfix if/unless/while/until must be Ripper::EXPR_LABEL
        indent += 1 unless t.state.allbits?(Ripper::EXPR_LABEL)
      when 'end'
        indent -= 1
      end
    end
    # percent literals are not indented
  }
  indent
end

#prompt ⇒ Object 



221
222
223
224
225
 
# File 'lib/irb/ruby-lex.rb', line 221

def prompt
  if @prompt
    @prompt.call(@ltype, @indent, @continue, @line_no)
  end
end

#set_auto_indent(context) ⇒ Object 



192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
 
# File 'lib/irb/ruby-lex.rb', line 192

def set_auto_indent(context)
  if @io.respond_to?(:auto_indent) and context.auto_indent_mode
    @io.auto_indent do |lines, line_index, byte_pointer, is_newline|
      if is_newline
        @tokens = self.class.ripper_lex_without_warning(lines[0..line_index].join("\n"), context: context)
        prev_spaces = find_prev_spaces(line_index)
        depth_difference = check_newline_depth_difference
        depth_difference = 0 if depth_difference < 0
        prev_spaces + depth_difference * 2
      else
        code = line_index.zero? ? '' : lines[0..(line_index - 1)].map{ |l| l + "\n" }.join
        last_line = lines[line_index]&.byteslice(0, byte_pointer)
        code += last_line if last_line
        @tokens = self.class.ripper_lex_without_warning(code, context: context)
        check_corresponding_token_depth(lines, line_index)
      end
    end
  end
end

#set_input(io, p = nil, context: nil, &block) ⇒ Object

io functions



51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
 
# File 'lib/irb/ruby-lex.rb', line 51

def set_input(io, p = nil, context: nil, &block)
  @io = io
  if @io.respond_to?(:check_termination)
    @io.check_termination do |code|
      if Reline::IOGate.in_pasting?
        lex = RubyLex.new
        rest = lex.check_termination_in_prev_line(code, context: context)
        if rest
          Reline.delete_text
          rest.bytes.reverse_each do |c|
            Reline.ungetc(c)
          end
          true
        else
          false
        end
      else
        code.gsub!(/\s*\z/, '').concat("\n")
        ltype, indent, continue, code_block_open = check_state(code, context: context)
        if ltype or indent > 0 or continue or code_block_open
          false
        else
          true
        end
      end
    end
  end
  if @io.respond_to?(:dynamic_prompt)
    @io.dynamic_prompt do |lines|
      lines << '' if lines.empty?
      result = []
      tokens = self.class.ripper_lex_without_warning(lines.map{ |l| l + "\n" }.join, context: context)
      code = String.new
      partial_tokens = []
      unprocessed_tokens = []
      line_num_offset = 0
      tokens.each do |t|
        partial_tokens << t
        unprocessed_tokens << t
        if t.tok.include?("\n")
          t_str = t.tok
          t_str.each_line("\n") do |s|
            code << s << "\n"
            ltype, indent, continue, code_block_open = check_state(code, partial_tokens, context: context)
            result << @prompt.call(ltype, indent, continue || code_block_open, @line_no + line_num_offset)
            line_num_offset += 1
          end
          unprocessed_tokens = []
        else
          code << t.tok
        end
      end

      unless unprocessed_tokens.empty?
        ltype, indent, continue, code_block_open = check_state(code, unprocessed_tokens, context: context)
        result << @prompt.call(ltype, indent, continue || code_block_open, @line_no + line_num_offset)
      end
      result
    end
  end

  if p.respond_to?(:call)
    @input = p
  elsif block_given?
    @input = block
  else
    @input = Proc.new{@io.gets}
  end
end

#set_prompt(p = nil, &block) ⇒ Object 



121
122
123
124
125
126
127
128
 
# File 'lib/irb/ruby-lex.rb', line 121

def set_prompt(p = nil, &block)
  p = block if block_given?
  if p.respond_to?(:call)
    @prompt = p
  else
    @prompt = Proc.new{print p}
  end
end

#take_corresponding_syntax_to_kw_do(tokens, index) ⇒ Object 



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
 
# File 'lib/irb/ruby-lex.rb', line 468

def take_corresponding_syntax_to_kw_do(tokens, index)
  syntax_of_do = nil
  # Finding a syntax corresponding to "do".
  index.downto(0) do |i|
    tk = tokens[i]
    # In "continue", the token isn't the corresponding syntax to "do".
    non_sp_index = tokens[0..(i - 1)].rindex{ |t| t.event != :on_sp }
    first_in_fomula = false
    if non_sp_index.nil?
      first_in_fomula = true
    elsif [:on_ignored_nl, :on_nl, :on_comment].include?(tokens[non_sp_index].event)
      first_in_fomula = true
    end
    if is_method_calling?(tokens, i)
      syntax_of_do = :method_calling
      break if first_in_fomula
    elsif tk.event == :on_kw && %w{while until for}.include?(tk.tok)
      # A loop syntax in front of "do" found.
      #
      #   while cond do # also "until" or "for"
      #   end
      #
      # This "do" doesn't increment indent because the loop syntax already
      # incremented.
      syntax_of_do = :loop_syntax
      break if first_in_fomula
    end
  end
  syntax_of_do
end