Class: Crokus::Parser

Inherits:
Object
  • Object
show all
Includes:
Indent
Defined in:
lib/crokus/parser.rb

Constant Summary collapse

STARTERS_ARRAY_OR_STRUCT_INIT = 
[:lbrace]
STARTERS_PRIMARY = 
[:ident,:integer_lit,:float_lit,:string_lit,:char_lit,:lparen]+STARTERS_ARRAY_OR_STRUCT_INIT
UNARY_OP = 
[:and,:mul,:add,:sub,:tilde,:not]
STARTERS_UNARY = 
[:inc_op,:dec_op,:sizeof]+STARTERS_PRIMARY+UNARY_OP
ASSIGN_OP = 
[:assign,:add_assign,:sub_assign,:mul_assign,:div_assign,:mod_assign,:xor_assign]
STARTERS_TYPE_SPECIFIER = 
[:void,:char,:short,:int,:long,:float,:signed,:unsigned,:struct,:union,:enum,:ident]
STARTERS_ABSTRACT_DECLARATOR =

: pointer

| direct_abstract_declarator
| pointer direct_abstract_declarator
;

[:mul,:lparen,:lbrack]
STARTERS_TYPE_QUALIFIER =

pointer : ‘*’ | ‘*’ type_qualifier_list | ‘*’ pointer | ‘*’ type_qualifier_list pointer ;

[:const,:volatile]

Constants included from Indent

Indent::INDENT

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Indent

#dedent, #indent, #say

Constructor Details

#initialize ⇒ Parser

Returns a new instance of Parser.



15
16
17
18
19
 
# File 'lib/crokus/parser.rb', line 15

def initialize
  @ppr=PrettyPrinter.new
  @verbose=false
  #@verbose=true
end

Instance Attribute Details

#str ⇒ Object

Returns the value of attribute str.



12
13
14
 
# File 'lib/crokus/parser.rb', line 12

def str
  @str
end

#tokens ⇒ Object

Returns the value of attribute tokens.



12
13
14
 
# File 'lib/crokus/parser.rb', line 12

def tokens
  @tokens
end

Instance Method Details

#abstract_decl ⇒ Object 



931
932
933
934
935
936
937
938
939
940
941
942
943
944
 
# File 'lib/crokus/parser.rb', line 931

def abstract_decl
  indent "abstract_decl"
  if showNext.is? STARTERS_ABSTRACT_DECLARATOR
    case showNext.kind
    when :mul
      pointer
    else
      direct_abstract_declarator
    end
  else
    raise "ERROR : in abstract_declarator. Expecting one of #{STARTERS_ABSTRACT_DECLARATOR}"
  end
  dedent
end

#acceptIt ⇒ Object 



21
22
23
24
 
# File 'lib/crokus/parser.rb', line 21

def acceptIt
  say showNext.kind.to_s+" "+showNext.val
  tokens.shift
end

#additive ⇒ Object 



790
791
792
793
794
795
796
797
798
799
800
 
# File 'lib/crokus/parser.rb', line 790

def additive
  indent "addititve : #{showNext}"
  e1=multitive
  while showNext.is? [:add,:sub]
    op=acceptIt
    e2=multitive
    e1=Binary.new(e1,op,e2)
  end
  dedent
  e1
end

#andexp ⇒ Object 



742
743
744
745
746
747
748
749
750
751
752
 
# File 'lib/crokus/parser.rb', line 742

def andexp
  indent "andexp : #{showNext}"
  e1=eqexp
  while showNext.is? :and
    op=acceptIt
    e2=eqexp
    e1=Binary.new(e1,op,e2)
  end
  dedent
  e1
end

#argument_expr_list ⇒ Object 



1080
1081
1082
1083
1084
1085
1086
1087
1088
 
# File 'lib/crokus/parser.rb', line 1080

def argument_expr_list
  list=[]
  list << expression
  while showNext.is? :comma
    acceptIt
    list << expression
  end
  list
end

#array_or_struct_init ⇒ Object 



1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
 
# File 'lib/crokus/parser.rb', line 1090

def array_or_struct_init
  indent "array_or_struct_init"
  expect :lbrace
  elements=[]
  while !showNext.is? :rbrace
    elements << (e=expression)
    if showNext.is? :comma
      acceptIt
    end
  end
  expect :rbrace
  dedent
  return ArrayOrStructInit.new(elements)
end

#arrayed?(type) ⇒ Boolean

Returns:

  • (Boolean) 


436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
 
# File 'lib/crokus/parser.rb', line 436

def arrayed?(type)
  return if tokens.empty?
  while showNext.is? :lbrack
    acceptIt
    if showNext.is? :rbrack
      acceptIt
      type=ArrayOf.new(type,IntLit.new(ZERO))
    else
      e=expression
      type=ArrayOf.new(type,e)
      expect :rbrack
    end
  end
  return type
end

#assign ⇒ Object 



668
669
670
671
672
673
674
675
676
677
678
 
# File 'lib/crokus/parser.rb', line 668

def assign
  indent "assign : #{showNext}"
  e1=cond_expr
  while showNext.is? ASSIGN_OP
    op=acceptIt
    e2=assign
    e1=Assign.new(e1,op,e2)
  end
  dedent
  return e1
end

#castexp ⇒ Object 



814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
 
# File 'lib/crokus/parser.rb', line 814

def castexp
  indent "castexpr : #{showNext}"
  case showNext.kind
  when :lparen # parenth expr OR casting !
    res=is_casting?
    if res
      e=casting
    else
      e=parenthesized
    end
  else
    e=unary
  end
  dedent
  return e
end

#casting ⇒ Object

def is_casting?

i=0
tok=DUMMY
while tok.kind!=:rparen
  tok=@tokens[i]
  i+=1
end
pp tok=@tokens[i]
return false if tok.is? [:mul,:add,:sub]
pp cond=STARTERS_UNARY-STARTERS_ARRAY_OR_STRUCT_INIT
return true if tok.is? cond
return false

end



870
871
872
873
874
875
876
877
 
# File 'lib/crokus/parser.rb', line 870

def casting
  puts "casting : #{showNext}" if $options[:verbose]
  expect :lparen
  t=parse_type
  expect :rparen
  u=unary
  CastedExpr.new(t,u)
end

#cond_expr ⇒ Object 



680
681
682
683
684
685
686
687
688
689
690
691
692
 
# File 'lib/crokus/parser.rb', line 680

def cond_expr
  indent "cond_expr : #{showNext}"
  e1=logor
  while showNext.is? :qmark
    acceptIt
    e2=expression
    expect :colon
    e3=cond_expr
    e1=CondExpr.new(e1,e2,e3)
  end
  dedent
  return e1
end

#dbg_print(node) ⇒ Object 



61
62
63
64
65
 
# File 'lib/crokus/parser.rb', line 61

def dbg_print node
  puts "debug ast node".center(60,'-')
  puts node.accept(@ppr)
  puts "-"*60
end

#dbg_print_next(n) ⇒ Object 



57
58
59
 
# File 'lib/crokus/parser.rb', line 57

def dbg_print_next n
  pp tokens[0..n-1].collect{|tok| tok.inspect}
end

#debug ⇒ Object 



646
647
648
 
# File 'lib/crokus/parser.rb', line 646

def debug
  puts " "*@indentation+@tokens[0..4].map{|t| "'#{t.val}'"}.join(" ")
end

#declaration ⇒ Object

int a int * a int a=1,b=2; int a[] int* f() struct name *ptr; paire_t paire = 1,2; int a,b,*c

TYPE ident ident ident



389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
 
# File 'lib/crokus/parser.rb', line 389

def declaration
  ret=[]
  @current_type=type=parse_type()
  d=declarator()
  a=arrayed?(type)
  if a
    type=a
  end
  func=parenthesized?
  if func
    func.type=type
    ret << func #func
    return ret
  end
  init=initialization?
  ret << Decl.new(type,d,init)
  while tokens.any? and showNext.is?(:comma)
    acceptIt
    ptr=pointed?
    if ptr
      type2=PointerTo.new(type)
    end
    d2=declarator
    a2=arrayed?(type)
    i2=initialization?
    ret << Decl.new(type2||type,d2)
  end
  if tokens.any?
    maybe :semicolon
  end
  return ret
end

#declarator ⇒ Object 



422
423
424
425
426
427
 
# File 'lib/crokus/parser.rb', line 422

def declarator
  if showNext.is? :ident
    ret=@current_ident=Ident.new(acceptIt)
  end
  return ret
end

#define ⇒ Object 



152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
 
# File 'lib/crokus/parser.rb', line 152

def define
  indent "define"
  expect :sharp
  expect :ident #define
  name=expect :ident
  args=[]
  if showNext.is? :lparen
    acceptIt
    while !showNext.is?(:rparen)
      args << acceptIt
      if showNext.is?(:comma)
        acceptIt
      end
    end
    expect :rparen
  end
  e=expression()
  dedent
  return Define.new(name,args,e)
end

#design_unit ⇒ Object 



109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
 
# File 'lib/crokus/parser.rb', line 109

def design_unit
  indent "designUnit"
  du=DesignUnit.new
  while tokens.any?
    case showNext.kind
    when :sharp
      case showNext(2).val
      when "include"
        du << include()
      when "define"
        du << define()
      end
    else
      du << declaration
      maybe :semicolon if tokens.any?
    end
  end
  dedent
  du.list.flatten!
  return du
end

#direct_abstract_declarator ⇒ Object 



967
968
969
 
# File 'lib/crokus/parser.rb', line 967

def direct_abstract_declarator
  raise
end

#do_while ⇒ Object 



325
326
327
328
329
330
331
332
333
 
# File 'lib/crokus/parser.rb', line 325

def do_while
  indent "do_while"
  expect :do
  body=statement()
  expect :while
  e=expression
  dedent
  DoWhile.new(e,body)
end

#eqexp ⇒ Object 



754
755
756
757
758
759
760
761
762
763
764
 
# File 'lib/crokus/parser.rb', line 754

def eqexp
  indent "eqexp : #{showNext}"
  e1=relexp
  while showNext.is? [:eq,:neq]
    op=acceptIt
    e2=relexp
    e1=Binary.new(e1,op,e2)
  end
  dedent
  e1
end

#exclor ⇒ Object 



730
731
732
733
734
735
736
737
738
739
740
 
# File 'lib/crokus/parser.rb', line 730

def exclor
  indent "exclor : #{showNext}"
  e1=andexp
  while showNext.is? :xor
    op=acceptIt
    e2=andexp
    e1=Binary.new(e1,op,e2)
  end
  dedent
  e1
end

#expect(kind) ⇒ Object 



30
31
32
33
34
35
36
37
38
 
# File 'lib/crokus/parser.rb', line 30

def expect kind
  if ((actual=tokens.shift).kind)!=kind
    puts "ERROR :"
    show_line(actual.pos)
    raise "expecting '#{kind}'. Received '#{actual.val}' around #{actual.pos}"
  end
  say actual.kind.to_s+" "+actual.val
  return actual
end

#expression ⇒ Object 



650
651
652
653
654
655
656
657
658
659
660
 
# File 'lib/crokus/parser.rb', line 650

def expression
  indent "expression : #{showNext}"
  e1=assign()
  while showNext.is? :comma
    acceptIt
    e2=assign()
    e1=CommaStmt.new(e1,e2)
  end
  dedent
  return e1
end

#expression_statement ⇒ Object 



636
637
638
639
640
641
642
643
644
 
# File 'lib/crokus/parser.rb', line 636

def expression_statement
  if showNext.is? :semicolon
    acceptIt
  else
    e=expression
    expect :semicolon
    return e
  end
end

#func_formal_arg ⇒ Object 



232
233
234
235
236
237
238
239
240
 
# File 'lib/crokus/parser.rb', line 232

def func_formal_arg
  @current_type=type=parse_type()
  d=declarator
  a=arrayed?(type)
  if a
    type=a
  end
  return FormalArg.new(type,d)
end

#function_body ⇒ Object 



242
243
244
245
246
247
248
249
250
251
252
253
 
# File 'lib/crokus/parser.rb', line 242

def function_body
  indent "function_body"
  body=Body.new
  expect :lbrace
  while showNext.kind!=:rbrace
    s=statement()
    body << s if s
  end
  expect :rbrace
  dedent
  return body
end

#function_decl(name, type_) ⇒ Object 



202
203
204
205
206
207
208
209
210
211
212
213
214
215
 
# File 'lib/crokus/parser.rb', line 202

def function_decl name,type_
  indent "function"
  args=function_formal_args()
  case showNext.kind
  when :semicolon
    acceptIt
    ret =FunctionProto.new(name,type_,args)
  else
    body=function_body()
    ret= Function.new(name,type_,args,body)
  end
  dedent
  return ret
end

#function_formal_args ⇒ Object 



217
218
219
220
221
222
223
224
225
226
227
228
229
230
 
# File 'lib/crokus/parser.rb', line 217

def function_formal_args
  indent "function_formal_args"
  args=[]
  expect :lparen
  while !showNext.is? :rparen
    args << func_formal_arg()
    if !showNext.is? :rparen
      expect :comma
    end
  end
  expect :rparen
  dedent
  return args
end

#inclor ⇒ Object 



718
719
720
721
722
723
724
725
726
727
728
 
# File 'lib/crokus/parser.rb', line 718

def inclor
  indent "inclor : #{showNext}"
  e1=exclor
  while showNext.is? :or
    op=acceptIt
    e2=exclor
    e1=Binary.new(e1,op,e2)
  end
  dedent
  e1
end

#include ⇒ Object 



131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
 
# File 'lib/crokus/parser.rb', line 131

def include
  indent "include"
  expect :sharp
  expect :ident #include
  case showNext.kind
  when :lt
    acceptIt
    id1=expect :ident
    expect :dot
    id2=expect :ident
    expect :gt
    name=Token.new [:ident,id1.val+"."+id2.val,id1.pos]
    env=:env
  when :string_lit
    name=acceptIt
    env=:local
  end
  dedent
  return Include.new(name,env)
end

#initialization? ⇒ Boolean

Returns:

  • (Boolean) 


452
453
454
455
456
457
458
459
 
# File 'lib/crokus/parser.rb', line 452

def initialization?
  return if tokens.empty?
  if showNext.is? :assign
    expect :assign
    e=expression
    return e
  end
end

#is_casting? ⇒ Boolean

Returns:

  • (Boolean) 


849
850
851
852
853
854
 
# File 'lib/crokus/parser.rb', line 849

def is_casting?
  #puts "is_casting? : #{pp @tokens[0..1]}"
  cond1= @tokens[0].is?(:lparen)
  cond2= @tokens[1].is?([:int,:uint,:short,:byte,:float,:long,:double])
  cond1 and cond2
end

#linearize_comma_stmt(ary) ⇒ Object 



1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
 
# File 'lib/crokus/parser.rb', line 1047

def linearize_comma_stmt ary
  ary.collect do |stmt|
    case stmt
    when CommaStmt
      stmt.to_list
    else
      stmt
    end
  end.flatten
end

#logand ⇒ Object 



706
707
708
709
710
711
712
713
714
715
716
 
# File 'lib/crokus/parser.rb', line 706

def logand
  indent "logand : #{showNext}"
  e1=inclor
  while showNext.is? :andand
    op=acceptIt
    e2=inclor
    e1=Binary.new(e1,op,e2)
  end
  dedent
  e1
end

#logor ⇒ Object 



694
695
696
697
698
699
700
701
702
703
704
 
# File 'lib/crokus/parser.rb', line 694

def logor
  indent "logor : #{showNext}"
  e1=logand
  while showNext.is? :oror
    op=acceptIt
    e2=logand
    e1=Binary.new(e1,op,e2)
  end
  dedent
  return e1
end

#lookahead(n = 2) ⇒ Object 



44
45
46
 
# File 'lib/crokus/parser.rb', line 44

def lookahead(n=2)
  tokens[n] if tokens.any?
end

#maybe(kind) ⇒ Object 



26
27
28
 
# File 'lib/crokus/parser.rb', line 26

def maybe kind
  return acceptIt if showNext.is? kind
end

#multitive ⇒ Object 



802
803
804
805
806
807
808
809
810
811
812
 
# File 'lib/crokus/parser.rb', line 802

def multitive
  indent "multitive : #{showNext}"
  e1=castexp
  while showNext.is? [:mul,:div,:mod]
    op=acceptIt
    e2=castexp
    e1=Binary.new(e1,op,e2)
  end
  dedent
  e1
end

#parenthesized ⇒ Object 



879
880
881
882
883
884
885
886
 
# File 'lib/crokus/parser.rb', line 879

def parenthesized
  indent "parenthesized : #{showNext}"
  expect :lparen
  e=expression
  expect :rparen
  dedent
  return Parenth.new(e)
end

#parenthesized? ⇒ Boolean

Returns:

  • (Boolean) 


461
462
463
464
465
466
467
 
# File 'lib/crokus/parser.rb', line 461

def parenthesized?
  return if tokens.empty?
  if showNext.is? :lparen
    f=function_decl(@current_ident,@current_type)
    return f
  end
end

#parse(str) ⇒ Object

.….….… parsing methods .….……



67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
 
# File 'lib/crokus/parser.rb', line 67

def parse str
  begin
    @str=str
    @tokens=Lexer.new.tokenize(str)
    #pp @tokens
    @tokens=@tokens.reject{|tok| tok==[nil,nil,nil]}
    @tokens=remove_comments()
    warnings=@tokens.select{|tok| tok.is? :lexer_warning}
    show_lexer_warnings(warnings)
    @tokens=@tokens.select{|tok| !tok.is? [:newline]}
    ast=design_unit()
  rescue Exception => e
    puts "PARSING ERROR : #{e}"
    puts "in C source at line/col #{showNext.pos}"
    puts e.backtrace
    abort
  end
end

#parse_body ⇒ Object 



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

def parse_body
  body=Body.new
  expect :lbrace
  while !showNext.is? :rbrace
    body << statement()
  end
  expect :rbrace
  return body
end

#parse_else ⇒ Object 



553
554
555
556
557
558
559
560
561
562
563
564
565
566
 
# File 'lib/crokus/parser.rb', line 553

def parse_else
  indent "parse else"
  expect :else
  ret=Else.new
  stmt=statement()
  case stmt
  when Body
    ret.body=stmt
  else
    ret.body=Body.new([stmt])
  end
  dedent
  return ret
end

#parse_for ⇒ Object 



583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
 
# File 'lib/crokus/parser.rb', line 583

def parse_for
  indent "parse_for"
  forloop=For.new
  expect :for
  expect :lparen
  forloop.init << expression_statement
  forloop.cond = expression()
  expect :semicolon
  forloop.increment=expression()
  expect :rparen
  stmt=statement()
  case stmt
  when Body
    forloop.body=stmt
  else
    forloop.body=Body.new([stmt])
  end
  dedent
  forloop
end

#parse_goto ⇒ Object 



317
318
319
320
321
322
323
 
# File 'lib/crokus/parser.rb', line 317

def parse_goto
  indent "goto"
  expect :goto #label
  id=expect(:ident)
  dedent
  Goto.new(id)
end

#parse_if ⇒ Object 



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
 
# File 'lib/crokus/parser.rb', line 526

def parse_if
  indent "parse_if"
  expect :if
  if showNext.is? :lparen # helps wrt casting.
    acceptIt
    lparen=true
  end
  cond=expression()
  expect :rparen if lparen
  body=Body.new
  if showNext.is? :lbrace
    lbrace=acceptIt
  end
  body << statement()
  if lbrace
    until showNext.is? :rbrace
      body << statement
    end
    expect :rbrace
  end
  if showNext.is? :else
    else_=parse_else()
  end
  dedent
  return If.new(cond,body,else_)
end

#parse_label ⇒ Object 



311
312
313
314
315
 
# File 'lib/crokus/parser.rb', line 311

def parse_label
  id=expect(:ident)
  expect(:colon)
  Ident.new(id)
end

#parse_return ⇒ Object 



367
368
369
370
371
372
373
374
375
 
# File 'lib/crokus/parser.rb', line 367

def parse_return
  indent "parse_return"
  expect :return
  unless showNext.is? :semicolon
    e=expression
  end
  dedent
  Return.new(e)
end

#parse_struct ⇒ Object 



173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
 
# File 'lib/crokus/parser.rb', line 173

def parse_struct
  indent "struct"
  expect :struct
  name=nil
  if showNext.is? :ident
    name=acceptIt
  end
  ret=Struct.new(name)
  if showNext.is? :lbrace
    acceptIt
    while !showNext.is? :rbrace
      ret.decls << declaration()
    end
    ret.decls.flatten!
    expect :rbrace
  end
  dedent
  return ret
end

#parse_type ⇒ Object 



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
 
# File 'lib/crokus/parser.rb', line 469

def parse_type
  indent "parse_type"
  ret=Type.new(nil)

  ret.precisions << spec_qualifier?() # const, volatile
  if showNext.is? [:signed,:unsigned]
    ret.precisions << acceptIt
  end

  case showNext.kind
  when :ident,:char,:int,:short,:long,:float,:double,:void
    ret.name=acceptIt
    while showNext.is? [:char,:int,:short,:long,:float,:double,:void]
      ret.precisions << ret.name
      ret.name=acceptIt
    end
    ret.precisions.flatten!
  when :struct
    ret=parse_struct()
  when :typedef
    ret=typedef()
  else
    raise "Parsing ERROR in type declaration: '#{showNext}' #{showNext.pos}"
  end

  while showNext.is? [:mul,:lparen]
    case showNext.kind
    when :mul
      acceptIt
      ret=PointerTo.new(ret)
    when :lparen
      acceptIt
      if showNext.is? :rparen
        acceptIt
      else
        expression
        expect :rparen
      end
    end
  end
  dedent
  return ret
end

#parse_while ⇒ Object 



568
569
570
571
572
573
574
575
576
577
578
579
580
581
 
# File 'lib/crokus/parser.rb', line 568

def parse_while
  indent "parse_while"
  expect :while
  cond=expression()
  stmt=statement()
  case stmt
  when Body
    body=stmt
  else
    body=Body.new([stmt])
  end
  dedent
  return While.new(cond,body)
end

#parseLoopCond ⇒ Object 



612
613
614
615
616
617
 
# File 'lib/crokus/parser.rb', line 612

def parseLoopCond
  indent "parseLoopCond"
  e=expression()
  dedent
  return e
end

#parseLoopEnd ⇒ Object 



619
620
621
622
623
624
 
# File 'lib/crokus/parser.rb', line 619

def parseLoopEnd
  indent "parseLoopEnd"
  s=statement()
  dedent
  return s
end

#parseLoopInit ⇒ Object 



604
605
606
607
608
609
610
 
# File 'lib/crokus/parser.rb', line 604

def parseLoopInit
  indent "parseLoopInit"
  ret=statement()
  dedent
  return [ret] # because for (int a,b=0;i<10;i++) is also possible.
  # then parser returns an array of Decl
end

#pointed? ⇒ Boolean

Returns:

  • (Boolean) 


429
430
431
432
433
434
 
# File 'lib/crokus/parser.rb', line 429

def pointed?
  return if tokens.empty?
  while showNext.is? :mul
    acceptIt
  end
end

#pointer ⇒ Object 



953
954
955
956
957
958
959
960
961
962
963
964
965
 
# File 'lib/crokus/parser.rb', line 953

def pointer
  expect :mul
  while showNext.is? STARTERS_TYPE_QUALIFIER+[:mul]
    case showNext.kind
    when :volatile
      acceptIt
    when :const
      acceptIt
    when :mult
      acceptIt
    end
  end
end

#postfix ⇒ Object 



1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
 
# File 'lib/crokus/parser.rb', line 1012

def postfix
  indent "postfix : #{showNext}"
  e1=primary
  while showNext.is? [:lbrack,:lparen,:dot,:inc_op,:dec_op,:ptr_op]
    case showNext.kind
    when :lbrack
      acceptIt
      e2=expression
      expect :rbrack
      e1=Indexed.new(e1,e2)
    when :lparen
      acceptIt
      args=[]
      if !showNext.is? :rparen
        args=argument_expr_list
      end
      expect :rparen
      args=linearize_comma_stmt(args)
      e1=FunCall.new(e1,args)
    when :dot
      acceptIt
      e2=Ident.new(expect :ident)
      e1=Dotted.new(e1,e2)
    when :ptr_op
      op=acceptIt
      expect :ident
    when :inc_op,:dec_op
      op=acceptIt
      e1=PostFixAccu.new(e1,op)
    end
  end
  dedent
  e1
end

#primary ⇒ Object 



1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
 
# File 'lib/crokus/parser.rb', line 1058

def primary
  case showNext.kind
  when :ident
    return Ident.new(acceptIt)
  when :integer_lit
    return IntLit.new(acceptIt)
  when :float_lit
    return FloatLit.new(acceptIt)
  when :string_lit
    return StrLit.new(acceptIt)
  when :char_lit
    return CharLit.new(acceptIt)
  when :lparen
    acceptIt
    e=expression
    expect :rparen
    return Parenth.new(e)
  when :lbrace
    return array_or_struct_init()
  end
end

#relexp ⇒ Object 



766
767
768
769
770
771
772
773
774
775
776
 
# File 'lib/crokus/parser.rb', line 766

def relexp
  indent "relexp : #{showNext}"
  e1=shiftexp
  while showNext.is? [:lte,:lt,:gte,:gt ]
    op=acceptIt
    e2=shiftexp
    e1=Binary.new(e1,op,e2)
  end
  dedent
  e1
end

#remove_comments ⇒ Object 



92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
 
# File 'lib/crokus/parser.rb', line 92

def remove_comments
  ret=[]
  in_comment=false
  tokens.each do |tok|
    case tok.kind
    when :comment
    when :lcomment
      in_comment=true
    when :rcomment
      in_comment=false
    else
      ret << tok unless in_comment
    end
  end
  ret
end

#shiftexp ⇒ Object 



778
779
780
781
782
783
784
785
786
787
788
 
# File 'lib/crokus/parser.rb', line 778

def shiftexp
  indent "shiftexp : #{showNext}"
  e1=additive
  while showNext.is? [:shift_l,:shift_r]
    op=acceptIt
    e2=additive
    e1=Binary.new(e1,op,e2)
  end
  dedent
  e1
end

#show_lexer_warnings(warnings) ⇒ Object 



86
87
88
89
90
 
# File 'lib/crokus/parser.rb', line 86

def show_lexer_warnings warnings
  warnings.each do |warn|
    puts "lexer warning : #{warn.val} at #{warn.pos}"
  end
end

#show_line(pos) ⇒ Object 



48
49
50
51
52
53
54
55
 
# File 'lib/crokus/parser.rb', line 48

def show_line pos
  l,c=*pos
  show_lines(str,l-2)
  line=str.split(/\n/)[l-1]
  pointer="-"*(5+c)+ "^"
  puts "#{l.to_s.ljust(5)}|#{line}"
  puts pointer
end

#showNext(n = 1) ⇒ Object 



40
41
42
 
# File 'lib/crokus/parser.rb', line 40

def showNext(n=1)
  tokens[n-1] if tokens.any?
end

#sizeof ⇒ Object 



997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
 
# File 'lib/crokus/parser.rb', line 997

def sizeof
  expect :sizeof
  case showNext.kind
  when :lparen
    acceptIt
    #e=typename
    e=parse_type
    expect :rparen
  else
    #e=unary
    e=expression
  end
  Sizeof.new(e)
end

#spec_qualifier? ⇒ Boolean

Returns:

  • (Boolean) 


513
514
515
516
517
518
519
520
521
522
523
524
 
# File 'lib/crokus/parser.rb', line 513

def spec_qualifier?
  list=[]
  while showNext.is? STARTERS_TYPE_QUALIFIER
    case showNext.kind
    when :volatile
      list << acceptIt
    when :const
      list << acceptIt
    end
  end
  list
end

#spec_qualifier_list ⇒ Object 



898
899
900
901
902
903
904
905
906
907
908
909
 
# File 'lib/crokus/parser.rb', line 898

def spec_qualifier_list
  indent "spec_qualifier_list #{showNext.inspect}"
  while showNext.is? STARTERS_TYPE_SPECIFIER+STARTERS_TYPE_QUALIFIER
    if showNext.is? STARTERS_TYPE_SPECIFIER
      list << type_specifier
    else
      list << type_qualifier
    end
  end
  dedent
  list
end

#statement(arg = nil) ⇒ Object 



255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
 
# File 'lib/crokus/parser.rb', line 255

def statement(arg=nil)
  indent "statement ...#{showNext.kind} #{showNext.pos.first}"
  case showNext.kind
  when :lbrace
    ret=parse_body()
  when :unsigned,:signed,:int,:short,:float,:double,:long,:char,:void
    ret=declaration()
  when :struct
    ret=declaration()
  when :if
    ret=parse_if()
  when :while
    ret=parse_while()
  when :for
    ret=parse_for()
  when :switch
    ret=switch()
  when :return
    ret=parse_return
  when :break
    acceptIt
    ret=Break.new
  when :continue
    acceptIt
    ret=Continue.new
  when :do
    ret=do_while()
  when :goto
    ret=parse_goto()
  when :ident
    case showNext(2).kind
    when :ident
      ret=declaration
    when :colon
      l=parse_label
      s=statement
      ret=LabeledStmt.new(l,s)
    else
      ret=expression_statement
    end
  when :const,:volatile
    ret=declaration()
  when :semicolon
    acceptIt
    #ret=expression_statement
  when :inc_op,:dec_op,:mul
    ret=expression_statement
  else
    show_line(showNext.pos)
    raise "unknown statement start at #{showNext.pos} .Got #{showNext.kind} #{showNext.val}"
  end
  maybe :semicolon
  dedent
  return ret
end

#switch ⇒ Object 



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
 
# File 'lib/crokus/parser.rb', line 335

def switch
  indent "switch"
  expect :switch
  expect :lparen
  e=expression
  ret=Switch.new(e,cases=[],default=nil)
  expect :rparen
  expect :lbrace
  while showNext.is? :case
    expect :case
    case_e=expression
    case_body=Body.new
    expect :colon
    while showNext.kind!=:rbrace and showNext.kind!=:case and showNext.kind!=:default
      case_body << statement()
    end
    cases << Case.new(case_e,case_body)
  end
  if showNext.is? :default
    acceptIt
    expect :colon
    default_body=Body.new
    while showNext.kind!=:rbrace
      default_body << statement()
    end
    ret.default=default_body
  end
  expect :rbrace
  dedent
  return ret
end

#type_specifier ⇒ Object 



912
913
914
915
916
917
918
919
920
921
922
923
 
# File 'lib/crokus/parser.rb', line 912

def type_specifier
  type=Type.new(nil,[])
  indent "type_specifier #{showNext}"
  if showNext.is? STARTERS_TYPE_SPECIFIER
    ret=acceptIt
    type.name=ret
  else
    raise "ERROR : type_specifier. Expecting one of '#{STARTERS_TYPE_SPECIFIER}' at #{showNext.pos}"
  end
  dedent
  type
end

#typedef ⇒ Object 



193
194
195
196
197
198
199
200
 
# File 'lib/crokus/parser.rb', line 193

def typedef
  indent "typedef"
  expect :typedef
  type=parse_type()
  id=expect(:ident)
  dedent
  return Typedef.new(type,id)
end

#typename ⇒ Object 



888
889
890
891
892
893
894
895
896
 
# File 'lib/crokus/parser.rb', line 888

def typename
  indent "typename"
  type=specifier_qualifier
  while showNext.is? STARTERS_ABSTRACT_DECLARATOR
    list << abstract_decl
  end
  dedent
  list
end

#unary ⇒ Object 



971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
 
# File 'lib/crokus/parser.rb', line 971

def unary
  if STARTERS_PRIMARY.include? showNext.kind
    u=postfix
  elsif showNext.is? [:and,:mul,:add,:sub,:tilde,:not]
    op=acceptIt
    e=castexp
    u=Unary.new(op,e)
  else
    case showNext.kind
    when :inc_op
      op=acceptIt
      u=unary
      u=PreFixAccu.new(op,u)
    when :dec_op
      op=acceptIt
      u=unary
      u=PreFixAccu.new(op,u)
    when :sizeof
      u=sizeof()
    else
      raise "not an unary. showNext : #{showNext}"
    end
  end
  return u
end