Class: IDL::Scanner

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

Defined Under Namespace

Classes: CharRegistry, Identifier, In, Position, StrIStream, TokenRegistry

Constant Summary collapse

LFCR = 
[ ("\n"), ("\r") ]
SPACES = 
[ ("\ "), ("\t") ]
WHITESPACE = 
SPACES + LFCR
ANNOTATION = 
'@'
ANNOTATION_STR = 
'@'
BREAKCHARS = 
[
'(', ')', '[', ']', '{', '}',
'^', '~',
'*', '%', '&', '|',
'<', '=', '>',
',', ';' ]
SHIFTCHARS = 
[ '<', '>' ]
DIGITS = 
('0'..'9').to_a
ALPHA_LC = 
('a'..'z').to_a
ALPHA_UC = 
('A'..'Z').to_a
OCTALS = 
('0'..'7').to_a
HEXCHARS = 
DIGITS + ('a'..'f').to_a + ('A'..'F').to_a
SIGNS = 
['-', '+']
DOT = 
'.'
IDCHARS = 
['_' ] + ALPHA_LC + ALPHA_UC
FULL_IDCHARS = 
IDCHARS + DIGITS
ESCTBL = 
CharRegistry.new({
  n: "\n", t: "\t", v: "\v", b: "\b",
  r: "\r", f: "\f", a: "\a"
})
KEYWORDS = 
%w(
     abstract alias any attribute boolean case char component connector const consumes context custom default double
     exception emits enum eventtype factory FALSE finder fixed float getraises home import in inout interface local
     long manages mirrorport module multiple native Object octet oneway out port porttype primarykey private provides
     public publishes raises readonly setraises sequence short string struct supports switch TRUE truncatable typedef
     typeid typename typeprefix unsigned union uses ValueBase valuetype void wchar wstring
   ).inject(TokenRegistry.new) { |h, a| h[a.downcase.to_sym] = a
h }
LITERALS = 
[
:integer_literal,
:string_literal,
# :wide_string_literal,
:character_literal,
# :wide_character_literal,
:fixed_pt_literal,
:floating_pt_literal,
:boolean_literal]
BOOL_LITERALS = 
{
  false: false,
  true: true
}

Instance Method Summary collapse

Constructor Details

#initialize(src, directiver, params = {}) ⇒ Scanner

Scanner



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# File 'lib/ridl/scanner.rb', line 274

def initialize(src, directiver, params = {})
  @includepaths = params[:includepaths] || []
  @xincludepaths = params[:xincludepaths] || []
  @idlversion = params[:idlversion]
  @stack = []
  @expansions = []
  @prefix = nil
  @directiver = directiver
  @directiver.instance_variable_get('@d').instance_variable_set('@scanner', self)
  @defined = TokenRegistry.new
  # initialize with predefined macros
  if params[:macros]
    params[:macros].each do |(name, value)|
      @defined[name] = value
    end
  end
  @ifdef = []
  @ifskip = false
  @ifnest = 0
  i = nil
  nm = ''
  case src
  when String
    i = StrIStream.new(src)
    nm = '<string>'
  when File
    i = src
    nm = src.path
  when IO, StringIO
    i = src
    nm = '<io>'
  else
    parse_error "illegal type for input source: #{src.class} "
  end
  @in = In.new(i, nm)
  @scan_comment = false # true if parsing commented annotation
  @in_annotation = false # true if parsing annotation

  # Extend the IDL keywords with IDL4 when enabled
  if @idlversion >= 4
    %w(bitfield bitmask bitset map int8 int16 int32 int64 uint8 uint16 uint32 uint64
).inject(KEYWORDS) { |h, a| h[a.downcase.to_sym] = a
h }
  end
end

Instance Method Details

#check_include(path, fname) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 341

def check_include(path, fname)
  fp = path + fname
  File.file?(fp) && File.readable?(fp)
end

#do_parse? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ridl/scanner.rb', line 405

def do_parse?
  @ifdef.empty? || @ifdef.last
end

#enter_expansion(src, define) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 369

def enter_expansion(src, define)
  IDL.log(2, "** RIDL - enter_expansion > #{define} = #{src}")
  @stack << [:define, nil, nil, @in, nil]
  @expansions << define
  @in = In.new(StrIStream.new(src), @in.position.name, @in.position.line, @in.position.column)
end

#enter_include(src, all = true) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 350

def enter_include(src, all = true)
  if @directiver.is_included?(src)
    @directiver.declare_include(src)
  else
    fpath = find_include(src, all)
    if fpath.nil?
      parse_error "Cannot open include file '#{src}'"
    end
    @stack << [:include, @prefix, @ifdef, @in, @ifskip]
    # record file dir as new searchpath
    @xincludepaths << (File.dirname(fpath) + '/')
    @prefix = nil
    @ifdef = []
    @in = In.new(File.open(fpath, 'r'), fpath)
    @directiver.enter_include(src, fpath)
    @directiver.pragma_prefix(nil)
  end
end

#eval_directive(s) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 806

def eval_directive(s)
  IDL.log(3, "** RIDL - eval_directive(#{s})")
  rc = eval(s)
  case rc
  when FalseClass, TrueClass
    rc
  when Numeric
    rc != 0
  else
    parse_error 'invalid preprocessor expression.'
  end
end

#extract_annotation ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 454

def extract_annotation
  annotation_body = nil
  # next token should be '(' in case of normal/single value annotation
  # or anything else in case of marker annotation
  skip_spaces # skip till next non-space or eol
  if peek_next == '('
    token = next_token # parse '('
    begin
      # identifier or value (in case of single value annotation) expected
      token = next_token
      if token.first == ')' # marker annotation; leave body empty
        annotation_body = { }
      else
        parse_error 'annotation member expected!' unless token.first == :identifier || is_literal?(token.first)
        s1 = token.last
        token = next_token # ')'  (in case of single value annotation) or '='
        if token.first == ')'
          parse_error 'invalid annotation member' if annotation_body
          annotation_body = { value: s1 }
        else
          parse_error 'invalid annotation member' unless token.first == '='
          token, annotation_value = extract_annotation_value
          parse_error 'invalid annotation body' unless token.first == ',' || token.first == ')'
          (annotation_body ||= {})[s1.to_s] = annotation_value
        end
      end
    end until token.first == ')'
    token = next_token_before_eol
  else
    token = next_token_before_eol
    # marker annotation or symbolic value; leave body nil
  end
  [token, annotation_body]
end

#extract_annotation_value ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 423

def extract_annotation_value
  token = next_token # needs '{' (array) or literal or identifier (which means nested annotation object or enum value)
  if token.first == '{'
    # extract array of values (literals or identifiers) separated by ','
    annotation_value = []
    begin
      token, ann_value = extract_annotation_value
      parse_error 'invalid annotation value array' unless token.first == ',' || token.first == '}'
      annotation_value << ann_value
    end until token.first == '}'
    token = next_token
  elsif token.first == :identifier
    member_annotation_id = token.last.to_s
    # get nested body
    token, member_annotation_body = extract_annotation
    # determin vaue type; if it has a body it is an annotation instance
    annotation_value = if member_annotation_body
      { member_annotation_id => member_annotation_body }
    else # otherwise it is a symbolic value
      member_annotation_id.to_sym
    end
    # get next token if needed
    token = next_token unless token
  else
    parse_error 'invalid annotation member' unless is_literal?(token.first)
    annotation_value = token.last
    token = next_token
  end
  [token, annotation_value]
end

#find_include(fname, all = true) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 320

def find_include(fname, all = true)
  if File.file?(fname) && File.readable?(fname)
    File.expand_path(fname)
  else
    # search transient include paths if allowed (quoted includes)
    fp = if all then
           @xincludepaths.find do |p|
             check_include(p, fname)
           end
         else
           nil
         end
    # search system include paths if still needed
    fp = @includepaths.find do |p|
      check_include(p, fname)
    end unless fp
    fp += fname if fp
    fp
  end
end

#getline ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 709

def getline
  s = ''
  while true
    ch = @in.lookc
    break if ch.nil?

    case
    when (ch == "\"") # "
      s << @in.getc # opening quote
      while true
        if @in.lookc == "\\"
          # escape sequence
          s << @in.getc
          _, escstr = next_escape_str(true)
          s << escstr
        elsif @in.lookc == "\"" # "
          break
        elsif @in.lookc
          # normal character
          s << @in.getc
        else
          parse_error 'unterminated string literal'
        end
      end
      s << @in.getc # closing quote
    when (ch == "\'") # ' # quoted character
      s << @in.getc # opening quote
      if @in.lookc == "\\"
        # escape sequence
        s << @in.getc
        _, escstr = next_escape_str(true)
        s << escstr
      elsif @in.lookc && @in.lookc != "\'" # '
        # normal character
        s << @in.getc
      end
      if @in.lookc != "\'" # '
        parse_error "character literal must be single character enclosed in \"'\""
      end
      s << @in.getc # closing quote
    when LFCR.include?(ch)
      @in.skipwhile { |ch_| LFCR.include? ch_ }
      break
    when ch == '/'
      @in.skipc
      if @in.lookc == '/'
        # //-style comment; skip till eol
        @in.gets
        break
      elsif @in.lookc == '*'
        # /*...*/ style comment; skip comment
        ch1 = nil
        @in.skipuntil { |ch_|
          ch0 = ch1; ch1 = ch_
          ch0 == '*' and ch1 == '/' #
        }
        if @in.lookc.nil?
          parse_error "cannot find comment closing brace (\'*/\'). "
        end
        @in.skipc
      else
        s << ch
      end
    when ch == "\\"
      @in.skipc
      if LFCR.include?(@in.lookc)
        # line continuation
        @in.skipwhile { |ch_| LFCR.include? ch_ }
        if @in.lookc.nil?
          parse_error "line continuation character ('\\') not allowed as last character in file."
        end
      else
        s << ch
      end
    else
      @in.skipc
      s << ch
    end
  end
  s
end

#in_expansion? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ridl/scanner.rb', line 384

def in_expansion?
  more_source? and @stack.last[0] == :define
end

#is_expanded?(define) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ridl/scanner.rb', line 376

def is_expanded?(define)
  @expansions.include?(define)
end

#is_literal?(o) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ridl/scanner.rb', line 419

def is_literal?(o)
  LITERALS.include?(o)
end

#leave_source ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 388

def leave_source
  # make sure to close the input source
  @in.close
  # check if we have any previous source still stacked up
  unless @stack.empty?
    if @stack.last[0] == :include
      @xincludepaths.pop # remove directory of finished include
      @directiver.leave_include
      _, @prefix, @ifdef, @in, @ifskip = @stack.pop
      @directiver.pragma_prefix(@prefix)
    else
      _, _, _, @in, _ = @stack.pop
      @expansions.pop
    end
  end
end

#more_source? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ridl/scanner.rb', line 380

def more_source?
  !@stack.empty?
end

#next_escape ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 576

def next_escape
  ret = 0
  case (ch = @in.getc)
  when nil
    parse_error 'illegal escape sequence'
  when '0'..'7'
    ret = ''
    ret << ch
    1.upto(2) {
      ch = @in.lookc
      if ('0'..'7').include? ch
        ret << ch
      else
        break
      end
      @in.skipc
    }
    ret = ret.oct
  when 'x' # i'm not sure '\x' should be 0 or 'x'. currently returns 0.
    ret = ''
    1.upto(2) {
      ch = @in.lookc
      if HEXCHARS.include? ch
        ret << ch
      else
        break
      end
      @in.skipc
    }
    ret = ret.hex
  when 'u'
    ret = ''
    1.upto(4) {
      ch = @in.lookc
      if HEXCHARS.include? ch
        ret << ch
      else
        break
      end
      @in.skipc
    }
    ret = ret.hex
  when 'n', 't', 'v', 'b', 'r', 'f', 'a'
    ret = ESCTBL[ch]
  else
    ret = ('' << ch).unpack('C').first
  end
  ret
end

#next_escape_str(keep_type_ch = false) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 626

def next_escape_str(keep_type_ch = false)
  ret = 0
  case (ch = @in.getc)
  when nil
    parse_error 'illegal escape sequence'
  when '0'..'7'
    ret = ''
    ret << ch
    1.upto(2) {
      ch = @in.lookc
      if ('0'..'7').include? ch
        ret << ch
      else
        break
      end
      @in.skipc
    }
    ret = [ :oct, ret ]
  when 'x' # i'm not sure '\x' should be 0 or 'x'. currently returns 0.
    ret = ''
    ret << ch if keep_type_ch
    1.upto(2) {
      ch = @in.lookc
      if HEXCHARS.include? ch
        ret << ch
      else
        break
      end
      @in.skipc
    }
    ret = [ :hex2, ret ]
  when 'u'
    ret = ''
    ret << ch if keep_type_ch
    1.upto(4) {
      ch = @in.lookc
      if HEXCHARS.include? ch
        ret << ch
      else
        break
      end
      @in.skipc
    }
    ret = [ :hex4, ret ]
  when 'n', 't', 'v', 'b', 'r', 'f', 'a'
    ret = ''
    ret << ch
    ret = [:esc, ret]
  else
    ret = ''
    ret << ch
    ret = [:esc_ch, ch]
  end
  ret
end

#next_identifier(first = nil) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 530

def next_identifier(first = nil)
  @in.mark(first)
  while true
    if FULL_IDCHARS.include?(@in.lookc)
      @in.skipc
    else
      break
    end
  end
  s0 = @in.getregion        # raw IDL id
  s1 = s0.downcase.to_sym   # downcased symbolized
  s2 = s0.dup               # (to be) unescaped id

  # simple check
  if s2.empty?
    parse_error 'identifier expected!'
  else
    if s2[0] == '_'
      s2.slice!(0) ## if starts with CORBA IDL escape => remove
    end
    parse_error "identifier must begin with alphabet character: #{s2}" unless ALPHA_LC.include?(s2[0]) || ALPHA_UC.include?(s2[0])
  end

  # preprocessor check
  if @defined.has_key?(s2) and !is_expanded?(s2)
    # enter expansion as new source
    enter_expansion(@defined[s2], s2)
    # call next_token to parse expanded source
    next_token
  # keyword check
  elsif @in_annotation
    if BOOL_LITERALS.has_key?(s1)
      [:boolean_literal, BOOL_LITERALS[s1]]
    else
      [:identifier, Identifier.new(s2, s2, s0)]
    end
  elsif (a = KEYWORDS.assoc(s1)).nil?
    # check for language mapping keyword
    [:identifier, Identifier.new(s2, chk_identifier(s2), s0)]
  elsif s0 == a[1]
    [a[1], nil]
  else
    parse_error "'#{s0}' collides with IDL keyword '#{a[1]}'"
  end
end

#next_token ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 970

def next_token
  sign = nil
  str = '' # initialize empty string
  while true
    ch = @in.getc
    if ch.nil?
      if !@ifdef.empty? and !in_expansion?
        parse_error 'mismatched #if/#endif'
      end
      if more_source?
        leave_source
        next
      else
        return [false, nil]
      end
    end

    if WHITESPACE.include? ch
      @in.skipwhile { |c| WHITESPACE.include?(c) }
      next
    end

    if str.empty? && ch == "\#"
      parse_directive
      next
    end
    unless do_parse?
      skipline
      next
    end

    str << ch
    case
    when BREAKCHARS.include?(ch)
      if SHIFTCHARS.include?(ch) && @in.lookc == ch
        # '<<' or '>>'
        str << @in.getc
      end
      return [str, str]

    when ch == ANNOTATION
      if @in_annotation
        return [str, str]
      else
        # return token returned by parse_annotation or parse next token recursively
        return parse_annotation || next_token
      end

    when ch == ':' #
      if @in.lookc == ':' #
        @in.skipc
        return %w(:: ::)
      else
        return %w(: :)
      end

    when ch == 'L'
      _nxtc = @in.lookc
      if _nxtc == "\'" # ' #single quote, for a character literal.
        @in.skipc # skip 'L'
        _nxtc = @in.lookc
        ret = if _nxtc == "\\"
          @in.skipc
          next_escape_str
        elsif _nxtc == "\'" # '
          [ nil, nil ]
        else
          [:char, '' << @in.getc]
        end

        if @in.lookc != "\'" # '
          parse_error "wide character literal must be single wide character enclosed in \"'\""
        end

        @in.skipc
        return [:wide_character_literal, ret]

      elsif _nxtc == "\"" # " #double quote, for a string literal.
        ret = []
        chs = ''
        @in.skipc # skip 'L'
        while true
          _nxtc = @in.lookc
          if _nxtc == "\\"
            @in.skipc
            ret << [:char, chs] unless chs.empty?
            chs = ''
            ret << next_escape_str
          elsif _nxtc == "\"" # "
            @in.skipc
            ret << [:char, chs] unless chs.empty?
            return [:wide_string_literal, ret]
          else
            chs << @in.getc
          end
        end

      else
        return next_identifier(ch)
      end

    when IDCHARS.include?(ch)
      return next_identifier(ch)

    when ch == '/' #
      _nxtc = @in.lookc
      if _nxtc == '*'
        # skip comment like a `/* ... */'
        @in.skipc # forward stream beyond `/*'
        ch1 = nil
        @in.skipuntil { |ch_|
          ch0 = ch1; ch1 = ch_
          ch0 == '*' and ch1 == '/' #
        }
        if @in.lookc.nil?
          parse_error "cannot find comment closing brace (\'*/\'). "
        end
        @in.skipc
        str = '' # reset
        next

      elsif _nxtc == '/'
        # skip comment like a `// ...\n'
        @in.skipc
        unless @scan_comment # scan_comment will be true when parsing commented annotations
          _nxtc = @in.lookc
          if _nxtc == ANNOTATION
            @in.skipc
            # return token returned by parse_annotation or parse next token recursively
            return parse_annotation(true) || next_token
          else
            @in.skipuntil { |c| LFCR.include?(c) }
          end
        end
        str = '' # reset
        next

      else
        return %w(/ /)
      end

    when SIGNS.include?(ch)
      _nxtc = @in.lookc
      if DIGITS.include? _nxtc
        sign = ch
        str = '' # reset
        next
      else
        return [str, str]
      end

    when ('1'..'9').include?(ch)
      @in.mark(sign, ch)
      @in.skipwhile { |c| DIGITS.include?(c) }
      num_type = (['.', 'e', 'E', 'd', 'D'].include?(@in.lookc)) ? skipfloat_or_fixed : :integer_literal

      r = @in.getregion

      if num_type == :floating_pt_literal
        return [:floating_pt_literal, r.to_f]
      elsif num_type == :fixed_pt_literal
        return [:fixed_pt_literal, r]
      else
        return [:integer_literal, r.to_i]
      end

    when ch == DOT #
      @in.mark(ch)
      @in.skipwhile { |c| DIGITS.include?(c) }
      num_type = (DOT != @in.lookc) ? skipfloat_or_fixed : nil
      s = @in.getregion
      if s == '.'
        parse_error 'token consisting of single dot (.) is invalid.'
      end
      if num_type == :floating_pt_literal
        return [:floating_pt_literal, s.to_f]
      elsif num_type == :fixed_pt_literal
        return [:fixed_pt_literal, s]
      else
        parse_error 'invalid floating point constant.'
      end

    when ch == '0'
      @in.mark(sign, ch)

      _nxtc = @in.lookc
      if _nxtc == 'x' || _nxtc == 'X'
        @in.skipc
        @in.skipwhile { |ch_| HEXCHARS.include? ch_ }
        s = @in.getregion
        return [:integer_literal, s.hex]
      else
        dec = false
        @in.skipwhile { |c| OCTALS.include?(c) }
        if ('8'..'9').include? @in.lookc
          dec = TRUE
          @in.skipwhile { |c| DIGITS.include?(c) }
        end

        num_type = (['.', 'e', 'E', 'd', 'D'].include?(@in.lookc)) ? skipfloat_or_fixed : :integer_literal

        s = @in.getregion
        ret = if num_type == :floating_pt_literal
          [:floating_pt_literal, s.to_f]
        elsif num_type == :fixed_pt_literal
          [:fixed_pt_literal, s]
        elsif dec
          parse_error "decimal literal starting with '0' should be octal ('0'..'7' only): #{s}"
        else
          [:integer_literal, s.oct]
        end
        return ret
      end

    when ch == "\'" # ' #single quote, for a character literal.
      _nxtc = @in.lookc
      ret = if _nxtc == "\\"
        @in.skipc
        next_escape
      elsif _nxtc == "\'" # '
        0
      elsif _nxtc
        ('' << @in.getc).unpack('C').first
      end

      if @in.lookc != "\'" # '
        parse_error "character literal must be single character enclosed in \"'\""
      end

      @in.skipc
      return [:character_literal, ret]

    when ch == "\"" # " #double quote, for a string literal.
      ret = ''
      while true
        _nxtc = @in.lookc
        if _nxtc == "\\"
          @in.skipc
          ret << next_escape
        elsif _nxtc == "\"" # "
          @in.skipc
          return [:string_literal, ret]
        elsif _nxtc
          ret << @in.getc
        else
          parse_error 'unterminated string literal'
        end
      end

    else
      parse_error 'illegal character [' << ch << ']'

    end # of case

  end # of while
  parse_error 'unexcepted error'
end

#next_token_before_eol ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 965

def next_token_before_eol
  @in.skipwhile { |c| SPACES.include?(c) }
  LFCR.include?(@in.lookc) ? nil : next_token
end

#parse_annotation(in_comment = false) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 489

def parse_annotation(in_comment = false)
  @in_annotation = true
  @scan_comment = in_comment
  begin
    # parse (possibly multiple) annotation(s)
    begin
      annotation_position = self.position.dup
      # next token should be identifier (must be on same line following '@')
      token = next_token
      parse_error 'annotation identifier expected!' unless token.first == :identifier
      annotation_id = token.last.to_s
      token, annotation_body = extract_annotation
      # pass annotation to directiver for processing
      @directiver.define_annotation(annotation_id, annotation_position, in_comment, annotation_body || {})
    end until token.nil? || token.first != ANNOTATION_STR
  ensure
    @in_annotation = false
    @scan_comment = false
  end
  # check identifier for keywords
  if token&.first == :identifier
    # keyword check
    if (a = KEYWORDS.assoc(token.last.to_s)).nil?
      token = [:identifier, Identifier.new(token.last.to_s, chk_identifier(token.last.to_s), token.last.unescaped_name)]
    elsif token.last == a[1]
      token = [a[1], nil]
    else
      parse_error "'#{token.last}' collides with a keyword '#{a[1]}'"
    end
  end
  token
end

#parse_directive ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 819

def parse_directive
  @in.skipwhile { |c| SPACES.include?(c) }
  s = getline
  /^(\w*)\s*/ === s
  s1 = $1
  s2 = $' # '

  if /(else|endif|elif)/ === s1

    if @ifdef.empty?
      parse_error '#else/#elif/#endif must not appear without preceding #if'
    end
    case s1
    when 'else'
      if @ifnest.zero?
        if @ifskip # true branch has already been parsed
          @ifdef[@ifdef.size - 1] = false
        else
          @ifdef[@ifdef.size - 1] ^= true
          @ifskip = @ifdef.last
        end
      end
    when 'endif'
      if @ifnest.zero?
        @ifdef.pop
        @ifskip = @ifdef.last
      else
        @ifnest -= 1
      end
    else
      if @ifnest.zero?
        if @ifskip || @ifdef[@ifdef.size - 1]
          # true branch has already been parsed so skip from now on
          @ifdef[@ifdef.size - 1] = false
          @ifskip = true
        else
          while s2 =~ /(^|[\W])defined\s*\(\s*(\w+)\s*\)/
             def_id = $2
             s2.gsub!(/(^|[\W])(defined\s*\(\s*\w+\s*\))/, '\1' + "#{@defined.has_key?(def_id).to_s}")
          end
          s2.gsub!(/(^|[\W])([A-Za-z_][\w]*)/) do |_| "#{$1}#{resolve_define($2)}" end
          begin
            @ifdef[@ifdef.size - 1] = eval_directive(s2)
            @ifskip = @ifdef[@ifdef.size - 1]
          rescue IDL::ParseError
            raise
          rescue => e
            p e
            puts e.backtrace.join("\n")
            parse_error 'error evaluating #elif'
          end
        end
      end
    end

  elsif /(if|ifn?def)/ === s1

    if /ifn?def/ === s1
      if do_parse?
        parse_error 'no #if(n)def target.' unless /^(\w+)/ === s2
        @ifdef.push(@defined[$1].nil? ^ (s1 == 'ifdef'))
        @ifskip = @ifdef.last
      else
        @ifnest += 1
      end

    else # when 'if'
      if do_parse?
        # match 'defined(Foo)' or 'defined Foo'
        while s2 =~ /(^|[\W])defined(\s*\(\s*(\w+)\s*\)|\s+(\w+))/
          IDL.log(3, "** RIDL - parse_directive : resolving 'defined(#{$3 || $4})'")
          def_id = $3 || $4
          # resolve 'defined' expression to 'true' or 'false' according to actual macro definition
          s2.gsub!(/(^|[\W])(defined\s*[\s\(]\s*#{def_id}(\s*\))?)/, '\1' + "#{@defined.has_key?(def_id).to_s}")
        end
        # match and resolve any macro variables listed in conditional expression
        s2.gsub!(/(^|[\W])([A-Za-z_][\w]*)/) do |_| "#{$1}#{resolve_define($2)}" end
        begin
          @ifdef.push(eval_directive(s2))
          @ifskip = @ifdef.last
        rescue IDL::ParseError
          raise
        rescue => e
          p e
          puts e.backtrace.join("\n")
          parse_error 'error evaluating #if'
        end
      else
        @ifnest += 1
      end
    end

  elsif do_parse?

    case s1
    when 'pragma'
      parse_pragma(s2)

    when 'error'
      parse_error(s2)

    when 'define'
      defid = s2.split.first
      parse_error 'no #define target.' unless defid
      parse_error "#{defid} is already #define-d." if @defined[defid]
      defval = s2.sub(/^\s*#{defid}/, '').strip
      defval = true if defval.empty?
      @defined[defid] = defval

    when 'undef'
      @defined.delete(s2)

    when 'include'
      if s2[0, 1] == '"' || s2[0, 1] == '<'
        quoted_inc = (s2[0, 1] == '"')
        if s2.size > 2
          s2.strip!
          s2 = s2.slice(1..(s2.size - 2))
        else
          s2 = ''
        end
      end
      enter_include(s2, quoted_inc)

    when /[0-9]+/
      # ignore line directive
    else
      parse_error "unknown directive: #{s}."
    end
  end
end

#parse_error(msg, ex = nil) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 413

def parse_error(msg, ex = nil)
  e = IDL::ParseError.new(msg, positions)
  e.set_backtrace(ex.backtrace) unless ex.nil?
  raise e
end

#parse_pragma(s) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 951

def parse_pragma(s)
  case s
  when /^ID\s+(.*)\s+"(.*)"\s*$/
    @directiver.pragma_id($1.strip, $2)
  when /^version\s+(.*)\s+([0-9]+)\.([0-9]+)\s*$/
    @directiver.pragma_version($1.strip, $2, $3)
  when /^prefix\s+"(.*)"\s*$/
    @prefix = $1
    @directiver.pragma_prefix(@prefix)
  else
    @directiver.handle_pragma(s)
  end
end

#peek_next ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 522

def peek_next
  @in.lookc
end

#position ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 346

def position
  @in.position
end

#positions ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 409

def positions
  @stack.reverse.inject(@in.nil? ? [] : [@in.position]) { |pos_arr, (_, _, _, in_, _)| pos_arr << in_.position }
end

#resolve_define(id, stack = []) ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 791

def resolve_define(id, stack = [])
  return id if %w(true false).include?(id)

  IDL.log(3, "*** RIDL - resolve_define(#{id})")
  if @defined.has_key?(id)
    define_ = @defined[id]
    stack << id
    parse_error("circular macro reference detected for [#{define_}]") if stack.include?(define_)
    # resolve any nested macro definitions
    define_.gsub(/(^|[\W])([A-Za-z_][\w]*)/) do |_| "#{$1}#{resolve_define($2, stack)}" end
  else
    '0' # unknown id
  end
end

#skip_spaces ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 526

def skip_spaces
  @in.skipwhile { |c| SPACES.include?(c) }
end

#skipfloat_or_fixed ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 682

def skipfloat_or_fixed
  if @in.lookc == DOT
    @in.skipc
    @in.skipwhile { |c| DIGITS.include?(c) }
  end
  if ['e', 'E'].include? @in.lookc
    @in.skipc
    @in.skipc if SIGNS.include? @in.lookc
    @in.skipwhile { |c| DIGITS.include?(c) }
    return :floating_pt_literal
  elsif ['d', 'D'].include? @in.lookc
    @in.skipc
    @in.skipc if SIGNS.include? @in.lookc
    @in.skipwhile { |c| DIGITS.include?(c) }
    return :fixed_pt_literal
  end
  :floating_pt_literal
end

#skipline ⇒ Object 



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# File 'lib/ridl/scanner.rb', line 701

def skipline
  while true
    s = @in.gets
    until s.chomp!.nil?; end
    break unless s[s.length - 1] == "\\"
  end
end