unconsume example

$txt .= $tok;
                $tok = $this->scanner->next();
            }
        }
        $len = strlen($sequence);
        $this->scanner->consume($len);
        $len += $this->scanner->whitespace();
        if ('>' !== $this->scanner->current()) {
            $this->parseError('Unclosed RCDATA end tag');
        }

        $this->scanner->unconsume($len);
        $this->events->text($txt);
        $this->setTextMode(0);

        return $this->endTag();
    }

    /** * If the document is read, emit an EOF event. */
    protected function eof()
    {
        

switch ($this->consume())
                {
                    case "\x78":
                    case "\x58":
                        $range = '0123456789ABCDEFabcdef';
                        $hex = true;
                        break;

                    default:
                        $range = '0123456789';
                        $hex = false;
                        $this->unconsume();
                        break;
                }

                if ($codepoint = $this->consume_range($range))
                {
                    static $windows_1252_specials = array(0x0D => "\x0A", 0x80 => "\xE2\x82\xAC", 0x81 => "\xEF\xBF\xBD", 0x82 => "\xE2\x80\x9A", 0x83 => "\xC6\x92", 0x84 => "\xE2\x80\x9E", 0x85 => "\xE2\x80\xA6", 0x86 => "\xE2\x80\xA0", 0x87 => "\xE2\x80\xA1", 0x88 => "\xCB\x86", 0x89 => "\xE2\x80\xB0", 0x8A => "\xC5\xA0", 0x8B => "\xE2\x80\xB9", 0x8C => "\xC5\x92", 0x8D => "\xEF\xBF\xBD", 0x8E => "\xC5\xBD", 0x8F => "\xEF\xBF\xBD", 0x90 => "\xEF\xBF\xBD", 0x91 => "\xE2\x80\x98", 0x92 => "\xE2\x80\x99", 0x93 => "\xE2\x80\x9C", 0x94 => "\xE2\x80\x9D", 0x95 => "\xE2\x80\xA2", 0x96 => "\xE2\x80\x93", 0x97 => "\xE2\x80\x94", 0x98 => "\xCB\x9C", 0x99 => "\xE2\x84\xA2", 0x9A => "\xC5\xA1", 0x9B => "\xE2\x80\xBA", 0x9C => "\xC5\x93", 0x9D => "\xEF\xBF\xBD", 0x9E => "\xC5\xBE", 0x9F => "\xC5\xB8");

                    if ($hex)
                    {
                        $codepoint = hexdec($codepoint);
                    }