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Current File : /opt/alt/ruby19/lib64/ruby/1.9.1/rdoc/ruby_lex.rb
# coding: US-ASCII

#--
#   irb/ruby-lex.rb - ruby lexcal analyzer
#   	$Release Version: 0.9.5$
#   	$Revision: 17979 $
#   	$Date: 2008-07-09 10:17:05 -0700 (Wed, 09 Jul 2008) $
#   	by Keiju ISHITSUKA(keiju@ruby-lang.org)
#
#++

require "e2mmap"
require "irb/slex"
require "rdoc/ruby_token"
require "stringio"

##
# Ruby lexer adapted from irb.
#
# The internals are not documented because they are scary.

class RDoc::RubyLex

  # :stopdoc:

  extend Exception2MessageMapper

  def_exception(:AlreadyDefinedToken, "Already defined token(%s)")
  def_exception(:TkReading2TokenNoKey, "key nothing(key='%s')")
  def_exception(:TkSymbol2TokenNoKey, "key nothing(key='%s')")
  def_exception(:TkReading2TokenDuplicateError,
                "key duplicate(token_n='%s', key='%s')")
  def_exception(:SyntaxError, "%s")

  def_exception(:TerminateLineInput, "Terminate Line Input")

  include RDoc::RubyToken
  include IRB

  attr_reader :continue
  attr_reader :lex_state
  attr_reader :reader

  class << self
    attr_accessor :debug_level
  end

  def self.debug?
    @debug_level > 0
  end

  self.debug_level = 0

  def initialize(content, options)
    lex_init

    if /\t/ =~ content then
      tab_width = options.tab_width
      content = content.split(/\n/).map do |line|
        1 while line.gsub!(/\t+/) {
          ' ' * (tab_width*$&.length - $`.length % tab_width)
        }  && $~
        line
      end.join("\n")
    end

    content << "\n" unless content[-1, 1] == "\n"

    set_input StringIO.new content

    @base_char_no = 0
    @char_no = 0
    @exp_line_no = @line_no = 1
    @here_readed = []
    @readed = []
    @rests = []
    @seek = 0

    @here_header = false
    @indent = 0
    @indent_stack = []
    @lex_state = EXPR_BEG
    @space_seen = false

    @continue = false
    @line = ""

    @skip_space = false
    @readed_auto_clean_up = false
    @exception_on_syntax_error = true

    @prompt = nil
    @prev_seek = nil
  end

  def inspect # :nodoc:
    "#<%s:0x%x pos %d lex_state %p space_seen %p>" % [
      self.class, object_id,
      @io.pos, @lex_state, @space_seen,
    ]
  end

  attr_accessor :skip_space
  attr_accessor :readed_auto_clean_up
  attr_accessor :exception_on_syntax_error

  attr_reader :seek
  attr_reader :char_no
  attr_reader :line_no
  attr_reader :indent

  # io functions
  def set_input(io, p = nil, &block)
    @io = io
    if p.respond_to?(:call)
      @input = p
    elsif block_given?
      @input = block
    else
      @input = Proc.new{@io.gets}
    end
  end

  def get_readed
    if idx = @readed.reverse.index("\n")
      @base_char_no = idx
    else
      @base_char_no += @readed.size
    end

    readed = @readed.join("")
    @readed = []
    readed
  end

  def getc
    while @rests.empty?
      #      return nil unless buf_input
      @rests.push nil unless buf_input
    end
    c = @rests.shift
    if @here_header
      @here_readed.push c
    else
      @readed.push c
    end
    @seek += 1
    if c == "\n"
      @line_no += 1
      @char_no = 0
    else
      @char_no += 1
    end

    c
  end

  def gets
    l = ""
    while c = getc
      l.concat(c)
      break if c == "\n"
    end
    return nil if l == "" and c.nil?
    l
  end

  def eof?
    @io.eof?
  end

  def getc_of_rests
    if @rests.empty?
      nil
    else
      getc
    end
  end

  def ungetc(c = nil)
    if @here_readed.empty?
      c2 = @readed.pop
    else
      c2 = @here_readed.pop
    end
    c = c2 unless c
    @rests.unshift c #c =
    @seek -= 1
    if c == "\n"
      @line_no -= 1
      if idx = @readed.reverse.index("\n")
        @char_no = @readed.size - idx
      else
        @char_no = @base_char_no + @readed.size
      end
    else
      @char_no -= 1
    end
  end

  def peek_equal?(str)
    chrs = str.split(//)
    until @rests.size >= chrs.size
      return false unless buf_input
    end
    @rests[0, chrs.size] == chrs
  end

  def peek_match?(regexp)
    while @rests.empty?
      return false unless buf_input
    end
    regexp =~ @rests.join("")
  end

  def peek(i = 0)
    while @rests.size <= i
      return nil unless buf_input
    end
    @rests[i]
  end

  def buf_input
    prompt
    line = @input.call
    return nil unless line
    @rests.concat line.split(//)
    true
  end
  private :buf_input

  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

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

  def initialize_input
    @ltype = nil
    @quoted = nil
    @indent = 0
    @indent_stack = []
    @lex_state = EXPR_BEG
    @space_seen = false
    @here_header = false

    @continue = false
    prompt

    @line = ""
    @exp_line_no = @line_no
  end

  def each_top_level_statement
    initialize_input
    catch(:TERM_INPUT) do
      loop do
        begin
          @continue = false
          prompt
          unless l = lex
            throw :TERM_INPUT if @line == ''
          else
            #p l
            @line.concat l
            if @ltype or @continue or @indent > 0
              next
            end
          end
          if @line != "\n"
            yield @line, @exp_line_no
          end
          break unless l
          @line = ''
          @exp_line_no = @line_no

          @indent = 0
          @indent_stack = []
          prompt
        rescue TerminateLineInput
          initialize_input
          prompt
          get_readed
        end
      end
    end
  end

  def lex
    until (((tk = token).kind_of?(TkNL) || tk.kind_of?(TkEND_OF_SCRIPT)) &&
           !@continue or
      tk.nil?)
      #p tk
      #p @lex_state
      #p self
    end
    line = get_readed
    #      print self.inspect
    if line == "" and tk.kind_of?(TkEND_OF_SCRIPT) || tk.nil?
      nil
    else
      line
    end
  end

  def token
    #      require "tracer"
    #      Tracer.on
    @prev_seek = @seek
    @prev_line_no = @line_no
    @prev_char_no = @char_no
    begin
      begin
        tk = @OP.match(self)
        @space_seen = tk.kind_of?(TkSPACE)
      rescue SyntaxError => e
        raise RDoc::Error, "syntax error: #{e.message}" if
          @exception_on_syntax_error

        tk = TkError.new(@seek, @line_no, @char_no)
      end
    end while @skip_space and tk.kind_of?(TkSPACE)

    if @readed_auto_clean_up
      get_readed
    end
    #      Tracer.off
    tk
  end

  ENINDENT_CLAUSE = [
    "case", "class", "def", "do", "for", "if",
    "module", "unless", "until", "while", "begin" #, "when"
  ]

  DEINDENT_CLAUSE = ["end" #, "when"
  ]

  PERCENT_LTYPE = {
    "q" => "\'",
    "Q" => "\"",
    "x" => "\`",
    "r" => "/",
    "w" => "]",
    "W" => "]",
    "s" => ":"
  }

  PERCENT_PAREN = {
    "{" => "}",
    "[" => "]",
    "<" => ">",
    "(" => ")"
  }

  PERCENT_PAREN_REV = PERCENT_PAREN.invert

  Ltype2Token = {
    "\'" => TkSTRING,
    "\"" => TkSTRING,
    "\`" => TkXSTRING,
    "/" => TkREGEXP,
    "]" => TkDSTRING,
    ":" => TkSYMBOL
  }
  DLtype2Token = {
    "\"" => TkDSTRING,
    "\`" => TkDXSTRING,
    "/" => TkDREGEXP,
  }

  def lex_init()
    @OP = IRB::SLex.new
    @OP.def_rules("\0", "\004", "\032") do |op, io|
      Token(TkEND_OF_SCRIPT)
    end

    @OP.def_rules(" ", "\t", "\f", "\r", "\13") do |op, io|
      @space_seen = true
      str = op
      while (ch = getc) =~ /[ \t\f\r\13]/ do
        str << ch
      end
      ungetc
      Token TkSPACE, str
    end

    @OP.def_rule("#") do |op, io|
      identify_comment
    end

    @OP.def_rule("=begin",
                 proc{|op, io| @prev_char_no == 0 && peek(0) =~ /\s/}) do
      |op, io|
      @ltype = "="
      res = ''
      nil until (ch = getc) == "\n"

      until ( peek_equal?("=end") && peek(4) =~ /\s/ ) do
        (ch = getc)
        res << ch
      end

      gets # consume =end

      @ltype = nil
      Token(TkCOMMENT, res)
    end

    @OP.def_rule("\n") do |op, io|
      print "\\n\n" if RDoc::RubyLex.debug?
      case @lex_state
      when EXPR_BEG, EXPR_FNAME, EXPR_DOT
        @continue = true
      else
        @continue = false
        @lex_state = EXPR_BEG
        until (@indent_stack.empty? ||
               [TkLPAREN, TkLBRACK, TkLBRACE,
                 TkfLPAREN, TkfLBRACK, TkfLBRACE].include?(@indent_stack.last))
          @indent_stack.pop
        end
      end
      @here_header = false
      @here_readed = []
      Token(TkNL)
    end

    @OP.def_rules("*", "**",
                  "=", "==", "===",
                  "=~", "<=>",
                  "<", "<=",
                  ">", ">=", ">>") do
      |op, io|
      case @lex_state
      when EXPR_FNAME, EXPR_DOT
        @lex_state = EXPR_ARG
      else
        @lex_state = EXPR_BEG
      end
      Token(op)
    end

    @OP.def_rules("!", "!=", "!~") do
      |op, io|
      @lex_state = EXPR_BEG
      Token(op)
    end

    @OP.def_rules("<<") do
      |op, io|
      tk = nil
      if @lex_state != EXPR_END && @lex_state != EXPR_CLASS &&
        (@lex_state != EXPR_ARG || @space_seen)
        c = peek(0)
        if /\S/ =~ c && (/["'`]/ =~ c || /\w/ =~ c || c == "-")
          tk = identify_here_document
        end
      end
      unless tk
        tk = Token(op)
        case @lex_state
        when EXPR_FNAME, EXPR_DOT
          @lex_state = EXPR_ARG
        else
          @lex_state = EXPR_BEG
        end
      end
      tk
    end

    @OP.def_rules("'", '"') do
      |op, io|
      identify_string(op)
    end

    @OP.def_rules("`") do
      |op, io|
      if @lex_state == EXPR_FNAME
        @lex_state = EXPR_END
        Token(op)
      else
        identify_string(op)
      end
    end

    @OP.def_rules('?') do
      |op, io|
      if @lex_state == EXPR_END
        @lex_state = EXPR_BEG
        Token(TkQUESTION)
      else
        ch = getc
        if @lex_state == EXPR_ARG && ch =~ /\s/
          ungetc
          @lex_state = EXPR_BEG;
          Token(TkQUESTION)
        else
          str = ch
          if ch == '\\'
            str << read_escape
          end
          @lex_state = EXPR_END
          str << (ch.respond_to?(:ord) ? ch.ord : ch[0])
          Token(TkINTEGER, str)
        end
      end
    end

    @OP.def_rules("&", "&&", "|", "||") do
      |op, io|
      @lex_state = EXPR_BEG
      Token(op)
    end

    @OP.def_rules("+=", "-=", "*=", "**=",
                  "&=", "|=", "^=", "<<=", ">>=", "||=", "&&=") do
      |op, io|
      @lex_state = EXPR_BEG
      op =~ /^(.*)=$/
      Token(TkOPASGN, $1)
    end

    @OP.def_rule("+@", proc{|op, io| @lex_state == EXPR_FNAME}) do
      |op, io|
      @lex_state = EXPR_ARG
      Token(op)
    end

    @OP.def_rule("-@", proc{|op, io| @lex_state == EXPR_FNAME}) do
      |op, io|
      @lex_state = EXPR_ARG
      Token(op)
    end

    @OP.def_rules("+", "-") do
      |op, io|
      catch(:RET) do
        if @lex_state == EXPR_ARG
          if @space_seen and peek(0) =~ /[0-9]/
            throw :RET, identify_number(op)
          else
            @lex_state = EXPR_BEG
          end
        elsif @lex_state != EXPR_END and peek(0) =~ /[0-9]/
          throw :RET, identify_number(op)
        else
          @lex_state = EXPR_BEG
        end
        Token(op)
      end
    end

    @OP.def_rule(".") do
      |op, io|
      @lex_state = EXPR_BEG
      if peek(0) =~ /[0-9]/
        ungetc
        identify_number
      else
        # for "obj.if" etc.
        @lex_state = EXPR_DOT
        Token(TkDOT)
      end
    end

    @OP.def_rules("..", "...") do
      |op, io|
      @lex_state = EXPR_BEG
      Token(op)
    end

    lex_int2
  end

  def lex_int2
    @OP.def_rules("]", "}", ")") do
      |op, io|
      @lex_state = EXPR_END
      @indent -= 1
      @indent_stack.pop
      Token(op)
    end

    @OP.def_rule(":") do
      |op, io|
      if @lex_state == EXPR_END || peek(0) =~ /\s/
        @lex_state = EXPR_BEG
        Token(TkCOLON)
      else
        @lex_state = EXPR_FNAME;
        Token(TkSYMBEG)
      end
    end

    @OP.def_rule("::") do
      |op, io|
      #      p @lex_state.id2name, @space_seen
      if @lex_state == EXPR_BEG or @lex_state == EXPR_ARG && @space_seen
        @lex_state = EXPR_BEG
        Token(TkCOLON3)
      else
        @lex_state = EXPR_DOT
        Token(TkCOLON2)
      end
    end

    @OP.def_rule("/") do
      |op, io|
      if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
        identify_string(op)
      elsif peek(0) == '='
        getc
        @lex_state = EXPR_BEG
        Token(TkOPASGN, "/") #/)
      elsif @lex_state == EXPR_ARG and @space_seen and peek(0) !~ /\s/
        identify_string(op)
      else
        @lex_state = EXPR_BEG
        Token("/") #/)
      end
    end

    @OP.def_rules("^") do
      |op, io|
      @lex_state = EXPR_BEG
      Token("^")
    end

    #       @OP.def_rules("^=") do
    # 	@lex_state = EXPR_BEG
    # 	Token(OP_ASGN, :^)
    #       end

    @OP.def_rules(",") do
      |op, io|
      @lex_state = EXPR_BEG
      Token(op)
    end

    @OP.def_rules(";") do
      |op, io|
      @lex_state = EXPR_BEG
      until (@indent_stack.empty? ||
             [TkLPAREN, TkLBRACK, TkLBRACE,
               TkfLPAREN, TkfLBRACK, TkfLBRACE].include?(@indent_stack.last))
        @indent_stack.pop
      end
      Token(op)
    end

    @OP.def_rule("~") do
      |op, io|
      @lex_state = EXPR_BEG
      Token("~")
    end

    @OP.def_rule("~@", proc{|op, io| @lex_state == EXPR_FNAME}) do
      |op, io|
      @lex_state = EXPR_BEG
      Token("~")
    end

    @OP.def_rule("(") do
      |op, io|
      @indent += 1
      if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
        @lex_state = EXPR_BEG
        tk_c = TkfLPAREN
      else
        @lex_state = EXPR_BEG
        tk_c = TkLPAREN
      end
      @indent_stack.push tk_c
      Token tk_c
    end

    @OP.def_rule("[]", proc{|op, io| @lex_state == EXPR_FNAME}) do
      |op, io|
      @lex_state = EXPR_ARG
      Token("[]")
    end

    @OP.def_rule("[]=", proc{|op, io| @lex_state == EXPR_FNAME}) do
      |op, io|
      @lex_state = EXPR_ARG
      Token("[]=")
    end

    @OP.def_rule("[") do
      |op, io|
      @indent += 1
      if @lex_state == EXPR_FNAME
        tk_c = TkfLBRACK
      else
        if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
          tk_c = TkLBRACK
        elsif @lex_state == EXPR_ARG && @space_seen
          tk_c = TkLBRACK
        else
          tk_c = TkfLBRACK
        end
        @lex_state = EXPR_BEG
      end
      @indent_stack.push tk_c
      Token(tk_c)
    end

    @OP.def_rule("{") do
      |op, io|
      @indent += 1
      if @lex_state != EXPR_END && @lex_state != EXPR_ARG
        tk_c = TkLBRACE
      else
        tk_c = TkfLBRACE
      end
      @lex_state = EXPR_BEG
      @indent_stack.push tk_c
      Token(tk_c)
    end

    @OP.def_rule('\\') do
      |op, io|
      if getc == "\n"
        @space_seen = true
        @continue = true
        Token(TkSPACE)
      else
        ungetc
        Token("\\")
      end
    end

    @OP.def_rule('%') do
      |op, io|
      if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
        identify_quotation
      elsif peek(0) == '='
        getc
        Token(TkOPASGN, :%)
      elsif @lex_state == EXPR_ARG and @space_seen and peek(0) !~ /\s/
        identify_quotation
      else
        @lex_state = EXPR_BEG
        Token("%") #))
      end
    end

    @OP.def_rule('$') do
      |op, io|
      identify_gvar
    end

    @OP.def_rule('@') do
      |op, io|
      if peek(0) =~ /[\w@]/
        ungetc
        identify_identifier
      else
        Token("@")
      end
    end

    #       @OP.def_rule("def", proc{|op, io| /\s/ =~ io.peek(0)}) do
    # 	|op, io|
    # 	@indent += 1
    # 	@lex_state = EXPR_FNAME
    # #	@lex_state = EXPR_END
    # #	until @rests[0] == "\n" or @rests[0] == ";"
    # #	  rests.shift
    # #	end
    #       end

    @OP.def_rule("_") do
      if peek_match?(/_END__/) and @lex_state == EXPR_BEG then
        Token(TkEND_OF_SCRIPT)
      else
        ungetc
        identify_identifier
      end
    end

    @OP.def_rule("") do
      |op, io|
      printf "MATCH: start %s: %s\n", op, io.inspect if RDoc::RubyLex.debug?
      if peek(0) =~ /[0-9]/
        t = identify_number
      else
        t = identify_identifier
      end
      printf "MATCH: end %s: %s\n", op, io.inspect if RDoc::RubyLex.debug?
      t
    end

    p @OP if RDoc::RubyLex.debug?
  end

  def identify_gvar
    @lex_state = EXPR_END

    case ch = getc
    when /[~_*$?!@\/\\;,=:<>".]/   #"
      Token(TkGVAR, "$" + ch)
    when "-"
      Token(TkGVAR, "$-" + getc)
    when "&", "`", "'", "+"
      Token(TkBACK_REF, "$"+ch)
    when /[1-9]/
      ref = ch
      while (ch = getc) =~ /[0-9]/ do ref << ch end
      ungetc
      Token(TkNTH_REF, "$#{ref}")
    when /\w/
      ungetc
      ungetc
      identify_identifier
    else
      ungetc
      Token("$")
    end
  end

  IDENT_RE = if defined? Encoding then
               /[\w\u0080-\uFFFF]/u
             else
               /[\w\x80-\xFF]/
             end

  def identify_identifier
    token = ""
    if peek(0) =~ /[$@]/
      token.concat(c = getc)
      if c == "@" and peek(0) == "@"
        token.concat getc
      end
    end

    while (ch = getc) =~ IDENT_RE do
      print " :#{ch}: " if RDoc::RubyLex.debug?
      token.concat ch
    end

    ungetc

    if (ch == "!" || ch == "?") && token[0,1] =~ /\w/ && peek(0) != "="
      token.concat getc
    end

    # almost fix token

    case token
    when /^\$/
      return Token(TkGVAR, token)
    when /^\@\@/
      @lex_state = EXPR_END
      # p Token(TkCVAR, token)
      return Token(TkCVAR, token)
    when /^\@/
      @lex_state = EXPR_END
      return Token(TkIVAR, token)
    end

    if @lex_state != EXPR_DOT
      print token, "\n" if RDoc::RubyLex.debug?

      token_c, *trans = TkReading2Token[token]
      if token_c
        # reserved word?

        if (@lex_state != EXPR_BEG &&
            @lex_state != EXPR_FNAME &&
            trans[1])
          # modifiers
          token_c = TkSymbol2Token[trans[1]]
          @lex_state = trans[0]
        else
          if @lex_state != EXPR_FNAME
            if ENINDENT_CLAUSE.include?(token)
              # check for ``class = val'' etc.
              valid = true
              case token
              when "class"
                valid = false unless peek_match?(/^\s*(<<|\w|::)/)
              when "def"
                valid = false if peek_match?(/^\s*(([+-\/*&\|^]|<<|>>|\|\||\&\&)=|\&\&|\|\|)/)
              when "do"
                valid = false if peek_match?(/^\s*([+-\/*]?=|\*|<|>|\&)/)
              when *ENINDENT_CLAUSE
                valid = false if peek_match?(/^\s*([+-\/*]?=|\*|<|>|\&|\|)/)
              else
                # no nothing
              end
              if valid
                if token == "do"
                  if ![TkFOR, TkWHILE, TkUNTIL].include?(@indent_stack.last)
                    @indent += 1
                    @indent_stack.push token_c
                  end
                else
                  @indent += 1
                  @indent_stack.push token_c
                end
              end

            elsif DEINDENT_CLAUSE.include?(token)
              @indent -= 1
              @indent_stack.pop
            end
            @lex_state = trans[0]
          else
            @lex_state = EXPR_END
          end
        end
        return Token(token_c, token)
      end
    end

    if @lex_state == EXPR_FNAME
      @lex_state = EXPR_END
      if peek(0) == '='
        token.concat getc
      end
    elsif @lex_state == EXPR_BEG || @lex_state == EXPR_DOT
      @lex_state = EXPR_ARG
    else
      @lex_state = EXPR_END
    end

    if token[0, 1] =~ /[A-Z]/
      return Token(TkCONSTANT, token)
    elsif token[token.size - 1, 1] =~ /[!?]/
      return Token(TkFID, token)
    else
      return Token(TkIDENTIFIER, token)
    end
  end

  def identify_here_document
    ch = getc
    #    if lt = PERCENT_LTYPE[ch]
    if ch == "-"
      ch = getc
      indent = true
    end
    if /['"`]/ =~ ch
      lt = ch
      quoted = ""
      while (c = getc) && c != lt
        quoted.concat c
      end
    else
      lt = '"'
      quoted = ch.dup
      while (c = getc) && c =~ /\w/
        quoted.concat c
      end
      ungetc
    end

    ltback, @ltype = @ltype, lt
    reserve = []
    while ch = getc
      reserve.push ch
      if ch == "\\"
        reserve.push ch = getc
      elsif ch == "\n"
        break
      end
    end

    @here_header = false
    doc = ''
    while l = gets
      l = l.sub(/(:?\r)?\n\z/, '')
      if (indent ? l.strip : l) == quoted
        break
      end
      doc << l
    end

    @here_header = true
    @here_readed.concat reserve
    while ch = reserve.pop
      ungetc ch
    end

    @ltype = ltback
    @lex_state = EXPR_END
    Token(Ltype2Token[lt], doc)
  end

  def identify_quotation
    ch = getc
    if lt = PERCENT_LTYPE[ch]
      ch = getc
    elsif ch =~ /\W/
      lt = "\""
    else
      raise RDoc::Error, "unknown type of %string #{ch.inspect}"
    end
    #     if ch !~ /\W/
    #       ungetc
    #       next
    #     end
    #@ltype = lt
    @quoted = ch unless @quoted = PERCENT_PAREN[ch]
    identify_string(lt, @quoted)
  end

  def identify_number(op = "")
    @lex_state = EXPR_END

    num = op

    if peek(0) == "0" && peek(1) !~ /[.eE]/
      num << getc

      case peek(0)
      when /[xX]/
        ch = getc
        match = /[0-9a-fA-F_]/
      when /[bB]/
        ch = getc
        match = /[01_]/
      when /[oO]/
        ch = getc
        match = /[0-7_]/
      when /[dD]/
        ch = getc
        match = /[0-9_]/
      when /[0-7]/
        match = /[0-7_]/
      when /[89]/
        raise RDoc::Error, "Illegal octal digit"
      else
        return Token(TkINTEGER, num)
      end

      num << ch if ch

      len0 = true
      non_digit = false
      while ch = getc
        num << ch
        if match =~ ch
          if ch == "_"
            if non_digit
              raise RDoc::Error, "trailing `#{ch}' in number"
            else
              non_digit = ch
            end
          else
            non_digit = false
            len0 = false
          end
        else
          ungetc
          num[-1, 1] = ''
          if len0
            raise RDoc::Error, "numeric literal without digits"
          end
          if non_digit
            raise RDoc::Error, "trailing `#{non_digit}' in number"
          end
          break
        end
      end
      return Token(TkINTEGER, num)
    end

    type = TkINTEGER
    allow_point = true
    allow_e = true
    non_digit = false
    while ch = getc
      num << ch
      case ch
      when /[0-9]/
        non_digit = false
      when "_"
        non_digit = ch
      when allow_point && "."
        if non_digit
          raise RDoc::Error, "trailing `#{non_digit}' in number"
        end
        type = TkFLOAT
        if peek(0) !~ /[0-9]/
          type = TkINTEGER
          ungetc
          num[-1, 1] = ''
          break
        end
        allow_point = false
      when allow_e && "e", allow_e && "E"
        if non_digit
          raise RDoc::Error, "trailing `#{non_digit}' in number"
        end
        type = TkFLOAT
        if peek(0) =~ /[+-]/
          num << getc
        end
        allow_e = false
        allow_point = false
        non_digit = ch
      else
        if non_digit
          raise RDoc::Error, "trailing `#{non_digit}' in number"
        end
        ungetc
        num[-1, 1] = ''
        break
      end
    end

    Token(type, num)
  end

  def identify_string(ltype, quoted = ltype)
    @ltype = ltype
    @quoted = quoted

    str = if ltype == quoted then
            ltype.dup
          else
            "%#{PERCENT_PAREN_REV[quoted]}"
          end

    subtype = nil
    begin
      nest = 0

      while ch = getc
        str << ch

        if @quoted == ch and nest == 0
          break
        elsif @ltype != "'" && @ltype != "]" && @ltype != ":" and ch == "#"
          ch = getc
          subtype = true
          if ch == "{" then
            str << ch << skip_inner_expression
            next
          else
            ungetc
          end
        elsif ch == '\\' and @ltype == "'" #'
          case ch = getc
          when "\\", "\n", "'"
          else
            ungetc
          end
        elsif ch == '\\' #'
          str << read_escape
        end

        if PERCENT_PAREN.values.include?(@quoted)
          if PERCENT_PAREN[ch] == @quoted
            nest += 1
          elsif ch == @quoted
            nest -= 1
          end
        end
      end

      if @ltype == "/"
        if peek(0) =~ /i|m|x|o|e|s|u|n/
          getc
        end
      end

      if subtype
        Token(DLtype2Token[ltype], str)
      else
        Token(Ltype2Token[ltype], str)
      end
    ensure
      @ltype = nil
      @quoted = nil
      @lex_state = EXPR_END
    end
  end

  def skip_inner_expression
    res = ""
    nest = 0
    while ch = getc
      res << ch
      if ch == '}'
        break if nest.zero?
        nest -= 1
      elsif ch == '{'
        nest += 1
      end
    end
    res
  end

  def identify_comment
    @ltype = "#"

    comment = '#'

    while ch = getc
      # if ch == "\\" #"
      #   read_escape
      # end
      if ch == "\n"
        @ltype = nil
        ungetc
        break
      end

      comment << ch
    end

    return Token(TkCOMMENT, comment)
  end

  def read_escape
    escape = ''
    ch = getc
    escape << ch

    case ch
    when "\n", "\r", "\f"
    when "\\", "n", "t", "r", "f", "v", "a", "e", "b", "s" #"
    when /[0-7]/
      ungetc ch
      3.times do
        ch = getc
        escape << ch
        case ch
        when /[0-7]/
        when nil
          break
        else
          ungetc
          break
        end
      end

    when "x"
      2.times do
        ch = getc
        escape << ch
        case ch
        when /[0-9a-fA-F]/
        when nil
          break
        else
          ungetc
          break
        end
      end

    when "M"
      ch = getc
      escape << ch
      if ch != '-'
        ungetc
      else
        ch = getc
        escape << ch
        if ch == "\\" #"
          escape << read_escape
        end
      end

    when "C", "c" #, "^"
      if ch == "C" and (ch = getc) != "-"
        escape << ch
        ungetc
      elsif (ch = getc) == "\\" #"
        escape << ch << read_escape
      end
    else
      # other characters
    end

    escape
  end

  # :startdoc:

end

#RDoc::RubyLex.debug_level = 1


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