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.



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# 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.



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

def str
  @str
end

#tokens ⇒ Object

Returns the value of attribute tokens.



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

def tokens
  @tokens
end

Instance Method Details

#abstract_decl ⇒ Object 



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# File 'lib/crokus/parser.rb', line 930

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 



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

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

#additive ⇒ Object 



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# File 'lib/crokus/parser.rb', line 789

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 



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# File 'lib/crokus/parser.rb', line 741

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 



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# File 'lib/crokus/parser.rb', line 1079

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

#array_or_struct_init ⇒ Object 



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# File 'lib/crokus/parser.rb', line 1089

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) 


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# File 'lib/crokus/parser.rb', line 435

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 



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# File 'lib/crokus/parser.rb', line 667

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 



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# File 'lib/crokus/parser.rb', line 813

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



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# File 'lib/crokus/parser.rb', line 869

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 



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# File 'lib/crokus/parser.rb', line 679

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 



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# 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 



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

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

#debug ⇒ Object 



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# File 'lib/crokus/parser.rb', line 645

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



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# File 'lib/crokus/parser.rb', line 388

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 



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# File 'lib/crokus/parser.rb', line 421

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

#define ⇒ Object 



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# File 'lib/crokus/parser.rb', line 151

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 



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# File 'lib/crokus/parser.rb', line 108

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 



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# File 'lib/crokus/parser.rb', line 966

def direct_abstract_declarator
  raise
end

#do_while ⇒ Object 



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# File 'lib/crokus/parser.rb', line 324

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

#eqexp ⇒ Object 



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# File 'lib/crokus/parser.rb', line 753

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 



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# File 'lib/crokus/parser.rb', line 729

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 



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# 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 



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# File 'lib/crokus/parser.rb', line 649

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 



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# File 'lib/crokus/parser.rb', line 635

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

#func_formal_arg ⇒ Object 



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# File 'lib/crokus/parser.rb', line 231

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 



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# File 'lib/crokus/parser.rb', line 241

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 



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# File 'lib/crokus/parser.rb', line 201

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 



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# File 'lib/crokus/parser.rb', line 216

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 



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# File 'lib/crokus/parser.rb', line 717

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 



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# File 'lib/crokus/parser.rb', line 130

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) 


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# File 'lib/crokus/parser.rb', line 451

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

#is_casting? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/crokus/parser.rb', line 848

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])
  cond1 and cond2
end

#linearize_comma_stmt(ary) ⇒ Object 



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# File 'lib/crokus/parser.rb', line 1046

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

#logand ⇒ Object 



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# File 'lib/crokus/parser.rb', line 705

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 



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# File 'lib/crokus/parser.rb', line 693

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 



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

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

#maybe(kind) ⇒ Object 



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

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

#multitive ⇒ Object 



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# File 'lib/crokus/parser.rb', line 801

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 



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# File 'lib/crokus/parser.rb', line 878

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

#parenthesized? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/crokus/parser.rb', line 460

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 .….……



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# File 'lib/crokus/parser.rb', line 67

def parse str
  begin
    @str=str
    @tokens=Lexer.new.tokenize(str)
    @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 



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# File 'lib/crokus/parser.rb', line 625

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

#parse_else ⇒ Object 



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# File 'lib/crokus/parser.rb', line 552

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 



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# File 'lib/crokus/parser.rb', line 582

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 



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# File 'lib/crokus/parser.rb', line 316

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

#parse_if ⇒ Object 



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# File 'lib/crokus/parser.rb', line 525

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 



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# File 'lib/crokus/parser.rb', line 310

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

#parse_return ⇒ Object 



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# File 'lib/crokus/parser.rb', line 366

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

#parse_struct ⇒ Object 



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# File 'lib/crokus/parser.rb', line 172

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 



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# File 'lib/crokus/parser.rb', line 468

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 



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# File 'lib/crokus/parser.rb', line 567

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 



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# File 'lib/crokus/parser.rb', line 611

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

#parseLoopEnd ⇒ Object 



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# File 'lib/crokus/parser.rb', line 618

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

#parseLoopInit ⇒ Object 



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# File 'lib/crokus/parser.rb', line 603

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) 


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# File 'lib/crokus/parser.rb', line 428

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

#pointer ⇒ Object 



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# File 'lib/crokus/parser.rb', line 952

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 



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# File 'lib/crokus/parser.rb', line 1011

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 



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# File 'lib/crokus/parser.rb', line 1057

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 



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# File 'lib/crokus/parser.rb', line 765

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 



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# File 'lib/crokus/parser.rb', line 91

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 



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# File 'lib/crokus/parser.rb', line 777

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 



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# File 'lib/crokus/parser.rb', line 85

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

#show_line(pos) ⇒ Object 



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# 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 



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

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

#sizeof ⇒ Object 



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# File 'lib/crokus/parser.rb', line 996

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) 


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# File 'lib/crokus/parser.rb', line 512

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 



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# File 'lib/crokus/parser.rb', line 897

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 



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# File 'lib/crokus/parser.rb', line 254

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 



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# File 'lib/crokus/parser.rb', line 334

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 



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# File 'lib/crokus/parser.rb', line 911

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 



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# File 'lib/crokus/parser.rb', line 192

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

#typename ⇒ Object 



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# File 'lib/crokus/parser.rb', line 887

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

#unary ⇒ Object 



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# File 'lib/crokus/parser.rb', line 970

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