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next_token() private

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# File lib/net/imap.rb, line 3366
      def next_token
        case @lex_state
        when EXPR_BEG
          if @str.index(BEG_REGEXP, @pos)
            @pos = $~.end(0)
            if $1
              return Token.new(T_SPACE, $+)
            elsif $2
              return Token.new(T_NIL, $+)
            elsif $3
              return Token.new(T_NUMBER, $+)
            elsif $4
              return Token.new(T_ATOM, $+)
            elsif $5
              return Token.new(T_QUOTED,
                               $+.gsub(/\\(["\\])/, "\\1"))
            elsif $6
              return Token.new(T_LPAR, $+)
            elsif $7
              return Token.new(T_RPAR, $+)
            elsif $8
              return Token.new(T_BSLASH, $+)
            elsif $9
              return Token.new(T_STAR, $+)
            elsif $10
              return Token.new(T_LBRA, $+)
            elsif $11
              return Token.new(T_RBRA, $+)
            elsif $12
              len = $+.to_i
              val = @str[@pos, len]
              @pos += len
              return Token.new(T_LITERAL, val)
            elsif $13
              return Token.new(T_PLUS, $+)
            elsif $14
              return Token.new(T_PERCENT, $+)
            elsif $15
              return Token.new(T_CRLF, $+)
            elsif $16
              return Token.new(T_EOF, $+)
            else
              parse_error("[Net::IMAP BUG] BEG_REGEXP is invalid")
            end
          else
            @str.index(/\S*/, @pos)
            parse_error("unknown token - %s", $&.dump)
          end
        when EXPR_DATA
          if @str.index(DATA_REGEXP, @pos)
            @pos = $~.end(0)
            if $1
              return Token.new(T_SPACE, $+)
            elsif $2
              return Token.new(T_NIL, $+)
            elsif $3
              return Token.new(T_NUMBER, $+)
            elsif $4
              return Token.new(T_QUOTED,
                               $+.gsub(/\\(["\\])/, "\\1"))
            elsif $5
              len = $+.to_i
              val = @str[@pos, len]
              @pos += len
              return Token.new(T_LITERAL, val)
            elsif $6
              return Token.new(T_LPAR, $+)
            elsif $7
              return Token.new(T_RPAR, $+)
            else
              parse_error("[Net::IMAP BUG] DATA_REGEXP is invalid")
            end
          else
            @str.index(/\S*/, @pos)
            parse_error("unknown token - %s", $&.dump)
          end
        when EXPR_TEXT
          if @str.index(TEXT_REGEXP, @pos)
            @pos = $~.end(0)
            if $1
              return Token.new(T_TEXT, $+)
            else
              parse_error("[Net::IMAP BUG] TEXT_REGEXP is invalid")
            end
          else
            @str.index(/\S*/, @pos)
            parse_error("unknown token - %s", $&.dump)
          end
        when EXPR_RTEXT
          if @str.index(RTEXT_REGEXP, @pos)
            @pos = $~.end(0)
            if $1
              return Token.new(T_LBRA, $+)
            elsif $2
              return Token.new(T_TEXT, $+)
            else
              parse_error("[Net::IMAP BUG] RTEXT_REGEXP is invalid")
            end
          else
            @str.index(/\S*/, @pos)
            parse_error("unknown token - %s", $&.dump)
          end
        when EXPR_CTEXT
          if @str.index(CTEXT_REGEXP, @pos)
            @pos = $~.end(0)
            if $1
              return Token.new(T_TEXT, $+)
            else
              parse_error("[Net::IMAP BUG] CTEXT_REGEXP is invalid")
            end
          else
            @str.index(/\S*/, @pos) #/
            parse_error("unknown token - %s", $&.dump)
          end
        else
          parse_error("invalid @lex_state - %s", @lex_state.inspect)
        end
      end
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