lex_init

# File lib/irb/ruby-lex.rb, line 339
  def lex_init()
    @OP = IRB::SLex.new
    @OP.def_rules("\00"", "\0004", "\0032") do |op, io|
      Token(TkEND_OF_SCRIPT)
    end

    @OP.def_rules(" ", "\t", "\f", "\r", "\113"") do |op, io|
      @space_seen = true
      while getc =~ /[ \t\f\r\113]]/; end
      ungetc
      Token(TkSPACE)
    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 = "="
      until getc == "\n"; end
      until peek_equal?("=end") && peek(4) =~ /\s/
        until getc == "\n"; end
      end
      gets
      @ltype = nil
      Token(TkRD_COMMENT)
    end

    @OP.def_rule("\n") do |op, io|
      print "\\n\n" if 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|
      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
          if (ch == '\') 
            read_escape
          end
          @lex_state = EXPR_END
          Token(TkINTEGER)
        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
          else
            @lex_state = EXPR_BEG
          end
        elsif @lex_state != EXPR_END and peek(0) =~ /[0-9]/
          throw :RET, identify_number
        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