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<?php
/**
*
* This file is part of the phpBB Forum Software package.
*
* @copyright (c) phpBB Limited <https://www.phpbb.com>
* @license GNU General Public License, version 2 (GPL-2.0)
*
* For full copyright and license information, please see
* the docs/CREDITS.txt file.
*
*/
/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
    exit;
}
/**
* BBCode class
*/
class bbcode
{
    var $bbcode_uid = '';
    var $bbcode_bitfield = '';
    var $bbcode_cache = array();
    var $bbcode_template = array();
    var $bbcodes = array();
    var $template_bitfield;
    /**
    * Constructor
    */
    function __construct($bitfield = '')
    {
        $this->bbcode_set_bitfield($bitfield);
    }
    /**
    * Init bbcode cache entries if bitfield is specified
    *
    * @param    string    $bbcode_bitfield    The bbcode bitfield
    */
    function bbcode_set_bitfield($bitfield = '')
    {
        if ($bitfield)
        {
            $this->bbcode_bitfield = $bitfield;
            $this->bbcode_cache_init();
        }
    }
    /**
    * Second pass bbcodes
    */
    function bbcode_second_pass(&$message, $bbcode_uid = '', $bbcode_bitfield = false)
    {
        if ($bbcode_uid)
        {
            $this->bbcode_uid = $bbcode_uid;
        }
        if ($bbcode_bitfield !== false)
        {
            $this->bbcode_bitfield = $bbcode_bitfield;
            // Init those added with a new bbcode_bitfield (already stored codes will not get parsed again)
            $this->bbcode_cache_init();
        }
        if (!$this->bbcode_bitfield)
        {
            // Remove the uid from tags that have not been transformed into HTML
            if ($this->bbcode_uid)
            {
                $message = str_replace(':' . $this->bbcode_uid, '', $message);
            }
            return;
        }
        $str = array('search' => array(), 'replace' => array());
        $preg = array('search' => array(), 'replace' => array());
        $bitfield = new bitfield($this->bbcode_bitfield);
        $bbcodes_set = $bitfield->get_all_set();
        $undid_bbcode_specialchars = false;
        foreach ($bbcodes_set as $bbcode_id)
        {
            if (!empty($this->bbcode_cache[$bbcode_id]))
            {
                foreach ($this->bbcode_cache[$bbcode_id] as $type => $array)
                {
                    foreach ($array as $search => $replace)
                    {
                        ${$type}['search'][] = str_replace('$uid', $this->bbcode_uid, $search);
                        ${$type}['replace'][] = $replace;
                    }
                    if (count($str['search']))
                    {
                        $message = str_replace($str['search'], $str['replace'], $message);
                        $str = array('search' => array(), 'replace' => array());
                    }
                    if (count($preg['search']))
                    {
                        // we need to turn the entities back into their original form to allow the
                        // search patterns to work properly
                        if (!$undid_bbcode_specialchars)
                        {
                            $message = str_replace(array('&#58;', '&#46;'), array(':', '.'), $message);
                            $undid_bbcode_specialchars = true;
                        }
                        foreach ($preg['search'] as $key => $search)
                        {
                            if (is_callable($preg['replace'][$key]))
                            {
                                $message = preg_replace_callback($search, $preg['replace'][$key], $message);
                            }
                            else
                            {
                                $message = preg_replace($search, $preg['replace'][$key], $message);
                            }
                        }
                        $preg = array('search' => array(), 'replace' => array());
                    }
                }
            }
        }
        // Remove the uid from tags that have not been transformed into HTML
        $message = str_replace(':' . $this->bbcode_uid, '', $message);
    }
    /**
    * Init bbcode cache
    *
    * requires: $this->bbcode_bitfield
    * sets: $this->bbcode_cache with bbcode templates needed for bbcode_bitfield
    */
    function bbcode_cache_init()
    {
        global $user, $phpbb_dispatcher, $phpbb_extension_manager, $phpbb_container, $phpbb_filesystem;
        if (empty($this->template_filename))
        {
            $this->template_bitfield = new bitfield($user->style['bbcode_bitfield']);
            $template = new \phpbb\template\twig\twig(
                $phpbb_container->get('path_helper'),
                $phpbb_container->get('config'),
                new \phpbb\template\context(),
                new \phpbb\template\twig\environment(
                    $phpbb_container->get('config'),
                    $phpbb_container->get('filesystem'),
                    $phpbb_container->get('path_helper'),
                    $phpbb_container->getParameter('core.cache_dir'),
                    $phpbb_container->get('ext.manager'),
                    new \phpbb\template\twig\loader(
                        $phpbb_filesystem
                    )
                ),
                $phpbb_container->getParameter('core.cache_dir'),
                $phpbb_container->get('user'),
                $phpbb_container->get('template.twig.extensions.collection'),
                $phpbb_extension_manager
            );
            $template->set_style();
            $template->set_filenames(array('bbcode.html' => 'bbcode.html'));
            $this->template_filename = $template->get_source_file_for_handle('bbcode.html');
        }
        $bbcode_ids = $rowset = $sql = array();
        $bitfield = new bitfield($this->bbcode_bitfield);
        $bbcodes_set = $bitfield->get_all_set();
        foreach ($bbcodes_set as $bbcode_id)
        {
            if (isset($this->bbcode_cache[$bbcode_id]))
            {
                // do not try to re-cache it if it's already in
                continue;
            }
            $bbcode_ids[] = $bbcode_id;
            if ($bbcode_id > NUM_CORE_BBCODES)
            {
                $sql[] = $bbcode_id;
            }
        }
        if (count($sql))
        {
            global $db;
            $sql = 'SELECT *
                FROM ' . BBCODES_TABLE . '
                WHERE ' . $db->sql_in_set('bbcode_id', $sql);
            $result = $db->sql_query($sql, 3600);
            while ($row = $db->sql_fetchrow($result))
            {
                // To circumvent replacing newlines with <br /> for the generated html,
                // we use carriage returns here. They are later changed back to newlines
                $row['bbcode_tpl'] = str_replace("\n", "\r", $row['bbcode_tpl']);
                $row['second_pass_replace'] = str_replace("\n", "\r", $row['second_pass_replace']);
                $rowset[$row['bbcode_id']] = $row;
            }
            $db->sql_freeresult($result);
        }
        foreach ($bbcode_ids as $bbcode_id)
        {
            switch ($bbcode_id)
            {
                case BBCODE_ID_QUOTE:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'str' => array(
                            '[/quote:$uid]'    => $this->bbcode_tpl('quote_close', $bbcode_id)
                        ),
                        'preg' => array(
                            '#\[quote(?:=&quot;(.*?)&quot;)?:$uid\]((?!\[quote(?:=&quot;.*?&quot;)?:$uid\]).)?#is'    => function ($match) {
                                if (!isset($match[2]))
                                {
                                    $match[2] = '';
                                }
                                return $this->bbcode_second_pass_quote($match[1], $match[2]);
                            },
                        )
                    );
                break;
                case BBCODE_ID_B:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'str' => array(
                            '[b:$uid]'    => $this->bbcode_tpl('b_open', $bbcode_id),
                            '[/b:$uid]'    => $this->bbcode_tpl('b_close', $bbcode_id),
                        )
                    );
                break;
                case BBCODE_ID_I:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'str' => array(
                            '[i:$uid]'    => $this->bbcode_tpl('i_open', $bbcode_id),
                            '[/i:$uid]'    => $this->bbcode_tpl('i_close', $bbcode_id),
                        )
                    );
                break;
                case BBCODE_ID_URL:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'preg' => array(
                            '#\[url:$uid\]((.*?))\[/url:$uid\]#s'            => $this->bbcode_tpl('url', $bbcode_id),
                            '#\[url=([^\[]+?):$uid\](.*?)\[/url:$uid\]#s'    => $this->bbcode_tpl('url', $bbcode_id),
                        )
                    );
                break;
                case BBCODE_ID_IMG:
                    if ($user->optionget('viewimg'))
                    {
                        $this->bbcode_cache[$bbcode_id] = array(
                            'preg' => array(
                                '#\[img:$uid\](.*?)\[/img:$uid\]#s'        => $this->bbcode_tpl('img', $bbcode_id),
                            )
                        );
                    }
                    else
                    {
                        $this->bbcode_cache[$bbcode_id] = array(
                            'preg' => array(
                                '#\[img:$uid\](.*?)\[/img:$uid\]#s'        => str_replace('$2', '[ img ]', $this->bbcode_tpl('url', $bbcode_id, true)),
                            )
                        );
                    }
                break;
                case BBCODE_ID_SIZE:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'preg' => array(
                            '#\[size=([\-\+]?\d+):$uid\](.*?)\[/size:$uid\]#s'    => $this->bbcode_tpl('size', $bbcode_id),
                        )
                    );
                break;
                case BBCODE_ID_COLOR:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'preg' => array(
                            '!\[color=(#[0-9a-f]{3}|#[0-9a-f]{6}|[a-z\-]+):$uid\](.*?)\[/color:$uid\]!is'    => $this->bbcode_tpl('color', $bbcode_id),
                        )
                    );
                break;
                case BBCODE_ID_U:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'str' => array(
                            '[u:$uid]'    => $this->bbcode_tpl('u_open', $bbcode_id),
                            '[/u:$uid]'    => $this->bbcode_tpl('u_close', $bbcode_id),
                        )
                    );
                break;
                case BBCODE_ID_CODE:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'preg' => array(
                            '#\[code(?:=([a-z]+))?:$uid\](.*?)\[/code:$uid\]#is'    => function ($match) {
                                return $this->bbcode_second_pass_code($match[1], $match[2]);
                            },
                        )
                    );
                break;
                case BBCODE_ID_LIST:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'preg' => array(
                            '#(\[\/?(list|\*):[mou]?:?$uid\])[\n]{1}#'    => "\$1",
                            '#(\[list=([^\[]+):$uid\])[\n]{1}#'            => "\$1",
                            '#\[list=([^\[]+):$uid\]#'                    => function ($match) {
                                return $this->bbcode_list($match[1]);
                            },
                        ),
                        'str' => array(
                            '[list:$uid]'        => $this->bbcode_tpl('ulist_open_default', $bbcode_id),
                            '[/list:u:$uid]'    => $this->bbcode_tpl('ulist_close', $bbcode_id),
                            '[/list:o:$uid]'    => $this->bbcode_tpl('olist_close', $bbcode_id),
                            '[*:$uid]'            => $this->bbcode_tpl('listitem', $bbcode_id),
                            '[/*:$uid]'            => $this->bbcode_tpl('listitem_close', $bbcode_id),
                            '[/*:m:$uid]'        => $this->bbcode_tpl('listitem_close', $bbcode_id)
                        ),
                    );
                break;
                case BBCODE_ID_EMAIL:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'preg' => array(
                            '#\[email:$uid\]((.*?))\[/email:$uid\]#is'            => $this->bbcode_tpl('email', $bbcode_id),
                            '#\[email=([^\[]+):$uid\](.*?)\[/email:$uid\]#is'    => $this->bbcode_tpl('email', $bbcode_id)
                        )
                    );
                break;
                case BBCODE_ID_FLASH:
                    if ($user->optionget('viewflash'))
                    {
                        $this->bbcode_cache[$bbcode_id] = array(
                            'preg' => array(
                                '#\[flash=([0-9]+),([0-9]+):$uid\](.*?)\[/flash:$uid\]#'    => $this->bbcode_tpl('flash', $bbcode_id),
                            )
                        );
                    }
                    else
                    {
                        $this->bbcode_cache[$bbcode_id] = array(
                            'preg' => array(
                                '#\[flash=([0-9]+),([0-9]+):$uid\](.*?)\[/flash:$uid\]#'    => str_replace('$1', '$3', str_replace('$2', '[ flash ]', $this->bbcode_tpl('url', $bbcode_id, true)))
                            )
                        );
                    }
                break;
                case BBCODE_ID_ATTACH:
                    $this->bbcode_cache[$bbcode_id] = array(
                        'str'    => array(
                            '[/attachment:$uid]'    => $this->bbcode_tpl('inline_attachment_close', $bbcode_id)
                        ),
                        'preg'    => array(
                            '#\[attachment=([0-9]+):$uid\]#'    => $this->bbcode_tpl('inline_attachment_open', $bbcode_id)
                        )
                    );
                break;
                default:
                    if (isset($rowset[$bbcode_id]))
                    {
                        if ($this->template_bitfield->get($bbcode_id))
                        {
                            // The bbcode requires a custom template to be loaded
                            if (!$bbcode_tpl = $this->bbcode_tpl($rowset[$bbcode_id]['bbcode_tag'], $bbcode_id))
                            {
                                // For some reason, the required template seems not to be available, use the default template
                                $bbcode_tpl = (!empty($rowset[$bbcode_id]['second_pass_replace'])) ? $rowset[$bbcode_id]['second_pass_replace'] : $rowset[$bbcode_id]['bbcode_tpl'];
                            }
                            else
                            {
                                // In order to use templates with custom bbcodes we need
                                // to replace all {VARS} to corresponding backreferences
                                // Note that backreferences are numbered from bbcode_match
                                if (preg_match_all('/\{(URL|LOCAL_URL|EMAIL|TEXT|SIMPLETEXT|INTTEXT|IDENTIFIER|COLOR|NUMBER)[0-9]*\}/', $rowset[$bbcode_id]['bbcode_match'], $m))
                                {
                                    foreach ($m[0] as $i => $tok)
                                    {
                                        $bbcode_tpl = str_replace($tok, '$' . ($i + 1), $bbcode_tpl);
                                    }
                                }
                            }
                        }
                        else
                        {
                            // Default template
                            $bbcode_tpl = (!empty($rowset[$bbcode_id]['second_pass_replace'])) ? $rowset[$bbcode_id]['second_pass_replace'] : $rowset[$bbcode_id]['bbcode_tpl'];
                        }
                        // Replace {L_*} lang strings
                        $bbcode_tpl = preg_replace_callback('/{L_([A-Z0-9_]+)}/', function ($match) use ($user) {
                            return (!empty($user->lang[$match[1]])) ? $user->lang($match[1]) : ucwords(strtolower(str_replace('_', ' ', $match[1])));
                        }, $bbcode_tpl);
                        if (!empty($rowset[$bbcode_id]['second_pass_replace']))
                        {
                            // The custom BBCode requires second-pass pattern replacements
                            $this->bbcode_cache[$bbcode_id] = array(
                                'preg' => array($rowset[$bbcode_id]['second_pass_match'] => $bbcode_tpl)
                            );
                        }
                        else
                        {
                            $this->bbcode_cache[$bbcode_id] = array(
                                'str' => array($rowset[$bbcode_id]['second_pass_match'] => $bbcode_tpl)
                            );
                        }
                    }
                    else
                    {
                        $this->bbcode_cache[$bbcode_id] = false;
                    }
                break;
            }
        }
        $bbcode_cache = $this->bbcode_cache;
        $bbcode_bitfield = $this->bbcode_bitfield;
        $bbcode_uid = $this->bbcode_uid;
        /**
        * Use this event to modify the bbcode_cache
        *
        * @event core.bbcode_cache_init_end
        * @var    array    bbcode_cache        The array of cached search and replace patterns of bbcodes
        * @var    string    bbcode_bitfield        The bbcode bitfield
        * @var    string    bbcode_uid            The bbcode uid
        * @since 3.1.3-RC1
        */
        $vars = array('bbcode_cache', 'bbcode_bitfield', 'bbcode_uid');
        extract($phpbb_dispatcher->trigger_event('core.bbcode_cache_init_end', compact($vars)));
        $this->bbcode_cache = $bbcode_cache;
        $this->bbcode_bitfield = $bbcode_bitfield;
        $this->bbcode_uid = $bbcode_uid;
    }
    /**
    * Return bbcode template
    */
    function bbcode_tpl($tpl_name, $bbcode_id = -1, $skip_bitfield_check = false)
    {
        static $bbcode_hardtpl = array();
        if (empty($bbcode_hardtpl))
        {
            global $user;
            $bbcode_hardtpl = array(
                'b_open'    => '<span style="font-weight: bold">',
                'b_close'    => '</span>',
                'i_open'    => '<span style="font-style: italic">',
                'i_close'    => '</span>',
                'u_open'    => '<span style="text-decoration: underline">',
                'u_close'    => '</span>',
                'img'        => '<img src="$1" class="postimage" alt="' . $user->lang['IMAGE'] . '" />',
                'size'        => '<span style="font-size: $1%; line-height: normal">$2</span>',
                'color'        => '<span style="color: $1">$2</span>',
                'email'        => '<a href="mailto:$1">$2</a>'
            );
        }
        if ($bbcode_id != -1 && !$skip_bitfield_check && !$this->template_bitfield->get($bbcode_id))
        {
            return (isset($bbcode_hardtpl[$tpl_name])) ? $bbcode_hardtpl[$tpl_name] : false;
        }
        if (empty($this->bbcode_template))
        {
            if (($tpl = file_get_contents($this->template_filename)) === false)
            {
                trigger_error('Could not load bbcode template', E_USER_ERROR);
            }
            // replace \ with \\ and then ' with \'.
            $tpl = str_replace('\\', '\\\\', $tpl);
            $tpl = str_replace("'", "\'", $tpl);
            // strip newlines and indent
            $tpl = preg_replace("/\n[\n\r\s\t]*/", '', $tpl);
            // Turn template blocks into PHP assignment statements for the values of $bbcode_tpl..
            $this->bbcode_template = array();
            // Capture the BBCode template matches
            // Allow phpBB template or the Twig syntax
            $matches = (preg_match_all('#<!-- BEGIN (.*?) -->(.*?)<!-- END (?:.*?) -->#', $tpl, $match)) ?:
                            preg_match_all('#{% for (.*?) in .*? %}(.*?){% endfor %}#s', $tpl, $match);
            for ($i = 0; $i < $matches; $i++)
            {
                if (empty($match[1][$i]))
                {
                    continue;
                }
                $this->bbcode_template[$match[1][$i]] = $this->bbcode_tpl_replace($match[1][$i], $match[2][$i]);
            }
        }
        return (isset($this->bbcode_template[$tpl_name])) ? $this->bbcode_template[$tpl_name] : ((isset($bbcode_hardtpl[$tpl_name])) ? $bbcode_hardtpl[$tpl_name] : false);
    }
    /**
    * Return bbcode template replacement
    */
    function bbcode_tpl_replace($tpl_name, $tpl)
    {
        global $user;
        static $replacements = array(
            'quote_username_open'    => array('{USERNAME}'    => '$1'),
            'color'                    => array('{COLOR}'        => '$1', '{TEXT}'            => '$2'),
            'size'                    => array('{SIZE}'        => '$1', '{TEXT}'            => '$2'),
            'img'                    => array('{URL}'        => '$1'),
            'flash'                    => array('{WIDTH}'        => '$1', '{HEIGHT}'            => '$2', '{URL}'    => '$3'),
            'url'                    => array('{URL}'        => '$1', '{DESCRIPTION}'    => '$2'),
            'email'                    => array('{EMAIL}'        => '$1', '{DESCRIPTION}'    => '$2')
        );
        $tpl = preg_replace_callback('/{L_([A-Z0-9_]+)}/', function ($match) use ($user) {
            return (!empty($user->lang[$match[1]])) ? $user->lang($match[1]) : ucwords(strtolower(str_replace('_', ' ', $match[1])));
        }, $tpl);
        if (!empty($replacements[$tpl_name]))
        {
            $tpl = strtr($tpl, $replacements[$tpl_name]);
        }
        return trim($tpl);
    }
    /**
    * Second parse list bbcode
    */
    function bbcode_list($type)
    {
        if ($type == '')
        {
            $tpl = 'ulist_open_default';
            $type = 'default';
        }
        else if ($type == 'i')
        {
            $tpl = 'olist_open';
            $type = 'lower-roman';
        }
        else if ($type == 'I')
        {
            $tpl = 'olist_open';
            $type = 'upper-roman';
        }
        else if (preg_match('#^(disc|circle|square)$#i', $type))
        {
            $tpl = 'ulist_open';
            $type = strtolower($type);
        }
        else if (preg_match('#^[a-z]$#', $type))
        {
            $tpl = 'olist_open';
            $type = 'lower-alpha';
        }
        else if (preg_match('#[A-Z]#', $type))
        {
            $tpl = 'olist_open';
            $type = 'upper-alpha';
        }
        else if (is_numeric($type))
        {
            $tpl = 'olist_open';
            $type = 'decimal';
        }
        else
        {
            $tpl = 'olist_open';
            $type = 'decimal';
        }
        return str_replace('{LIST_TYPE}', $type, $this->bbcode_tpl($tpl));
    }
    /**
    * Second parse quote tag
    */
    function bbcode_second_pass_quote($username, $quote)
    {
        // when using the /e modifier, preg_replace slashes double-quotes but does not
        // seem to slash anything else
        $quote = str_replace('\"', '"', $quote);
        $username = str_replace('\"', '"', $username);
        // remove newline at the beginning
        if ($quote == "\n")
        {
            $quote = '';
        }
        $quote = (($username) ? str_replace('$1', $username, $this->bbcode_tpl('quote_username_open')) : $this->bbcode_tpl('quote_open')) . $quote;
        return $quote;
    }
    /**
    * Second parse code tag
    */
    function bbcode_second_pass_code($type, $code)
    {
        // when using the /e modifier, preg_replace slashes double-quotes but does not
        // seem to slash anything else
        $code = str_replace('\"', '"', $code);
        switch ($type)
        {
            case 'php':
                // Not the english way, but valid because of hardcoded syntax highlighting
                if (strpos($code, '<span class="syntaxdefault"><br /></span>') === 0)
                {
                    $code = substr($code, 41);
                }
            // no break;
            default:
                $code = str_replace("\t", '&nbsp; &nbsp;', $code);
                $code = str_replace('  ', '&nbsp; ', $code);
                $code = str_replace('  ', ' &nbsp;', $code);
                $code = str_replace("\n ", "\n&nbsp;", $code);
                // keep space at the beginning
                if (!empty($code) && $code[0] == ' ')
                {
                    $code = '&nbsp;' . substr($code, 1);
                }
                // remove newline at the beginning
                if (!empty($code) && $code[0] == "\n")
                {
                    $code = substr($code, 1);
                }
            break;
        }
        $code = $this->bbcode_tpl('code_open') . $code . $this->bbcode_tpl('code_close');
        return $code;
    }
    /**
    * Function to perform custom bbcode second pass by extensions
    * can be used to assign bbcode pattern replacement
    * Example: '#\[list=([^\[]+):$uid\]#e'    => "\$this->bbcode_second_pass_by_extension('\$1')"
    *
    * Accepts variable number of parameters
    *
    * @return mixed Second pass result
    *
    * @deprecated 3.2.10 (To be removed 4.0.0)
    */
    function bbcode_second_pass_by_extension()
    {
        global $phpbb_dispatcher;
        $return = false;
        $params_array = func_get_args();
        /**
        * Event to perform bbcode second pass with
        * the custom validating methods provided by extensions
        *
        * @event core.bbcode_second_pass_by_extension
        * @var array    params_array    Array with the function parameters
        * @var mixed    return            Second pass result to return
        *
        * @since 3.1.5-RC1
        */
        $vars = array('params_array', 'return');
        extract($phpbb_dispatcher->trigger_event('core.bbcode_second_pass_by_extension', compact($vars)));
        return $return;
    }
}