1 files changed, 678 insertions, 0 deletions
diff --git a/phpBB/phpbb/textformatter/s9e/factory.php b/phpBB/phpbb/textformatter/s9e/factory.php
new file mode 100644
index 0000000000..f82c7b0771
--- /dev/null
+++ b/phpBB/phpbb/textformatter/s9e/factory.php
@@ -0,0 +1,678 @@
+<?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.
+*
+*/
+
+namespace phpbb\textformatter\s9e;
+
+use s9e\TextFormatter\Configurator;
+use s9e\TextFormatter\Configurator\Items\AttributeFilters\RegexpFilter;
+use s9e\TextFormatter\Configurator\Items\UnsafeTemplate;
+
+/**
+* Creates s9e\TextFormatter objects
+*/
+class factory implements \phpbb\textformatter\cache_interface
+{
+	/**
+	* @var \phpbb\textformatter\s9e\link_helper
+	*/
+	protected $link_helper;
+
+	/**
+	* @var \phpbb\cache\driver\driver_interface
+	*/
+	protected $cache;
+
+	/**
+	* @var string Path to the cache dir
+	*/
+	protected $cache_dir;
+
+	/**
+	* @var string Cache key used for the parser
+	*/
+	protected $cache_key_parser;
+
+	/**
+	* @var string Cache key used for the renderer
+	*/
+	protected $cache_key_renderer;
+
+	/**
+	* @var \phpbb\config\config
+	*/
+	protected $config;
+
+	/**
+	* @var array Custom tokens used in bbcode.html and their corresponding token from the definition
+	*/
+	protected $custom_tokens = array(
+		'email' => array('{DESCRIPTION}' => '{TEXT}'),
+		'flash' => array('{WIDTH}' => '{NUMBER1}', '{HEIGHT}' => '{NUMBER2}'),
+		'img'   => array('{URL}' => '{IMAGEURL}'),
+		'list'  => array('{LIST_TYPE}' => '{HASHMAP}'),
+		'quote' => array('{USERNAME}' => '{TEXT1}'),
+		'size'  => array('{SIZE}' => '{FONTSIZE}'),
+		'url'   => array('{DESCRIPTION}' => '{TEXT}'),
+	);
+
+	/**
+	* @var \phpbb\textformatter\data_access
+	*/
+	protected $data_access;
+
+	/**
+	* @var array Default BBCode definitions
+	*/
+	protected $default_definitions = array(
+		'attachment' => '[ATTACHMENT index={NUMBER} filename={TEXT;useContent}]',
+		'b'     => '[B]{TEXT}[/B]',
+		'code'  => '[CODE lang={IDENTIFIER;optional}]{TEXT}[/CODE]',
+		'color' => '[COLOR={COLOR}]{TEXT}[/COLOR]',
+		'email' => '[EMAIL={EMAIL;useContent} subject={TEXT1;optional;postFilter=rawurlencode} body={TEXT2;optional;postFilter=rawurlencode}]{TEXT}[/EMAIL]',
+		'flash' => '[FLASH={NUMBER1},{NUMBER2} width={NUMBER1;postFilter=#flashwidth} height={NUMBER2;postFilter=#flashheight} url={URL;useContent} /]',
+		'i'     => '[I]{TEXT}[/I]',
+		'img'   => '[IMG src={IMAGEURL;useContent}]',
+		'list'  => '[LIST type={HASHMAP=1:decimal,a:lower-alpha,A:upper-alpha,i:lower-roman,I:upper-roman;optional;postFilter=#simpletext} #createChild=LI]{TEXT}[/LIST]',
+		'li'    => '[* $tagName=LI]{TEXT}[/*]',
+		'quote' =>
+			"[QUOTE
+				author={TEXT1;optional}
+				post_id={UINT;optional}
+				post_url={URL;optional;postFilter=#false}
+				msg_id={UINT;optional}
+				msg_url={URL;optional;postFilter=#false}
+				profile_url={URL;optional;postFilter=#false}
+				time={UINT;optional}
+				url={URL;optional}
+				user_id={UINT;optional}
+				author={PARSE=/^\\[url=(?'url'.*?)](?'author'.*)\\[\\/url]$/i}
+				author={PARSE=/^\\[url](?'author'(?'url'.*?))\\[\\/url]$/i}
+				author={PARSE=/(?'url'https?:\\/\\/[^[\\]]+)/i}
+			]{TEXT2}[/QUOTE]",
+		'size'  => '[SIZE={FONTSIZE}]{TEXT}[/SIZE]',
+		'u'     => '[U]{TEXT}[/U]',
+		'url'   => '[URL={URL;useContent} $forceLookahead=true]{TEXT}[/URL]',
+	);
+
+	/**
+	* @var array Default templates, taken from bbcode::bbcode_tpl()
+	*/
+	protected $default_templates = array(
+		'b'     => '<span style="font-weight: bold"><xsl:apply-templates/></span>',
+		'i'     => '<span style="font-style: italic"><xsl:apply-templates/></span>',
+		'u'     => '<span style="text-decoration: underline"><xsl:apply-templates/></span>',
+		'img'   => '<img src="{IMAGEURL}" class="postimage" alt="{L_IMAGE}"/>',
+		'size'	=> '<span><xsl:attribute name="style"><xsl:text>font-size: </xsl:text><xsl:value-of select="substring(@size, 1, 4)"/><xsl:text>%; line-height: normal</xsl:text></xsl:attribute><xsl:apply-templates/></span>',
+		'color' => '<span style="color: {COLOR}"><xsl:apply-templates/></span>',
+		'email' => '<a>
+			<xsl:attribute name="href">
+				<xsl:text>mailto:</xsl:text>
+				<xsl:value-of select="@email"/>
+				<xsl:if test="@subject or @body">
+					<xsl:text>?</xsl:text>
+					<xsl:if test="@subject">subject=<xsl:value-of select="@subject"/></xsl:if>
+					<xsl:if test="@body"><xsl:if test="@subject">&amp;</xsl:if>body=<xsl:value-of select="@body"/></xsl:if>
+				</xsl:if>
+			</xsl:attribute>
+			<xsl:apply-templates/>
+		</a>',
+	);
+
+	/**
+	* @var \phpbb\event\dispatcher_interface
+	*/
+	protected $dispatcher;
+
+	/**
+	* @var \phpbb\log\log_interface
+	*/
+	protected $log;
+
+	/**
+	* Constructor
+	*
+	* @param \phpbb\textformatter\data_access $data_access
+	* @param \phpbb\cache\driver\driver_interface $cache
+	* @param \phpbb\event\dispatcher_interface $dispatcher
+	* @param \phpbb\config\config $config
+	* @param \phpbb\textformatter\s9e\link_helper $link_helper
+	* @param \phpbb\log\log_interface $log
+	* @param string $cache_dir          Path to the cache dir
+	* @param string $cache_key_parser   Cache key used for the parser
+	* @param string $cache_key_renderer Cache key used for the renderer
+	*/
+	public function __construct(\phpbb\textformatter\data_access $data_access, \phpbb\cache\driver\driver_interface $cache, \phpbb\event\dispatcher_interface $dispatcher, \phpbb\config\config $config, \phpbb\textformatter\s9e\link_helper $link_helper, \phpbb\log\log_interface $log, $cache_dir, $cache_key_parser, $cache_key_renderer)
+	{
+		$this->link_helper = $link_helper;
+		$this->cache = $cache;
+		$this->cache_dir = $cache_dir;
+		$this->cache_key_parser = $cache_key_parser;
+		$this->cache_key_renderer = $cache_key_renderer;
+		$this->config = $config;
+		$this->data_access = $data_access;
+		$this->dispatcher = $dispatcher;
+		$this->log = $log;
+	}
+
+	/**
+	* {@inheritdoc}
+	*/
+	public function invalidate()
+	{
+		$this->regenerate();
+	}
+
+	/**
+	* {@inheritdoc}
+	*
+	* Will remove old renderers from the cache dir but won't touch the current renderer
+	*/
+	public function tidy()
+	{
+		// Get the name of current renderer
+		$renderer_data = $this->cache->get($this->cache_key_renderer);
+		$renderer_file = ($renderer_data) ? $renderer_data['class'] . '.php' : null;
+
+		foreach (glob($this->cache_dir . 's9e_*') as $filename)
+		{
+			// Only remove the file if it's not the current renderer
+			if (!$renderer_file || substr($filename, -strlen($renderer_file)) !== $renderer_file)
+			{
+				unlink($filename);
+			}
+		}
+	}
+
+	/**
+	* Generate and return a new configured instance of s9e\TextFormatter\Configurator
+	*
+	* @return Configurator
+	*/
+	public function get_configurator()
+	{
+		// Create a new Configurator
+		$configurator = new Configurator;
+
+		/**
+		* Modify the s9e\TextFormatter configurator before the default settings are set
+		*
+		* @event core.text_formatter_s9e_configure_before
+		* @var \s9e\TextFormatter\Configurator configurator Configurator instance
+		* @since 3.2.0-a1
+		*/
+		$vars = array('configurator');
+		extract($this->dispatcher->trigger_event('core.text_formatter_s9e_configure_before', compact($vars)));
+
+		// Reset the list of allowed schemes
+		foreach ($configurator->urlConfig->getAllowedSchemes() as $scheme)
+		{
+			$configurator->urlConfig->disallowScheme($scheme);
+		}
+		foreach (explode(',', $this->config['allowed_schemes_links']) as $scheme)
+		{
+			$configurator->urlConfig->allowScheme(trim($scheme));
+		}
+
+		// Convert newlines to br elements by default
+		$configurator->rootRules->enableAutoLineBreaks();
+
+		// Don't automatically ignore text in places where text is not allowed
+		$configurator->rulesGenerator->remove('IgnoreTextIfDisallowed');
+
+		// Don't remove comments and instead convert them to xsl:comment elements
+		$configurator->templateNormalizer->remove('RemoveComments');
+		$configurator->templateNormalizer->add('TransposeComments');
+
+		// Set the rendering engine and configure it to save to the cache dir
+		$configurator->rendering->engine = 'PHP';
+		$configurator->rendering->engine->cacheDir = $this->cache_dir;
+		$configurator->rendering->engine->defaultClassPrefix = 's9e_renderer_';
+		$configurator->rendering->engine->enableQuickRenderer = true;
+
+		// Create custom filters for BBCode tokens that are supported in phpBB but not in
+		// s9e\TextFormatter
+		$filter = new RegexpFilter('#^' . get_preg_expression('relative_url') . '$#Du');
+		$configurator->attributeFilters->add('#local_url', $filter);
+		$configurator->attributeFilters->add('#relative_url', $filter);
+
+		// INTTEXT regexp from acp_bbcodes
+		$filter = new RegexpFilter('!^([\p{L}\p{N}\-+,_. ]+)$!Du');
+		$configurator->attributeFilters->add('#inttext', $filter);
+
+		// Create custom filters for Flash restrictions, which use the same values as the image
+		// restrictions but have their own error message
+		$configurator->attributeFilters
+			->add('#flashheight', __NAMESPACE__ . '\\parser::filter_flash_height')
+			->addParameterByName('max_img_height')
+			->addParameterByName('logger');
+
+		$configurator->attributeFilters
+			->add('#flashwidth', __NAMESPACE__ . '\\parser::filter_flash_width')
+			->addParameterByName('max_img_width')
+			->addParameterByName('logger');
+
+		// Create a custom filter for phpBB's per-mode font size limits
+		$configurator->attributeFilters
+			->add('#fontsize', __NAMESPACE__ . '\\parser::filter_font_size')
+			->addParameterByName('max_font_size')
+			->addParameterByName('logger')
+			->markAsSafeInCSS();
+
+		// Create a custom filter for image URLs
+		$configurator->attributeFilters
+			->add('#imageurl', __NAMESPACE__ . '\\parser::filter_img_url')
+			->addParameterByName('urlConfig')
+			->addParameterByName('logger')
+			->addParameterByName('max_img_height')
+			->addParameterByName('max_img_width')
+			->markAsSafeAsURL()
+			->setJS('UrlFilter.filter');
+
+		// Add default BBCodes
+		foreach ($this->get_default_bbcodes($configurator) as $bbcode)
+		{
+			$this->add_bbcode($configurator, $bbcode['usage'], $bbcode['template']);
+		}
+		if (isset($configurator->tags['QUOTE']))
+		{
+			// Remove the nesting limit and let other services remove quotes at parsing time
+			$configurator->tags['QUOTE']->nestingLimit = PHP_INT_MAX;
+		}
+
+		// Modify the template to disable images/flash depending on user's settings
+		foreach (array('FLASH', 'IMG') as $name)
+		{
+			$tag = $configurator->tags[$name];
+			$tag->template = '<xsl:choose><xsl:when test="$S_VIEW' . $name . '">' . $tag->template . '</xsl:when><xsl:otherwise><xsl:apply-templates/></xsl:otherwise></xsl:choose>';
+		}
+
+		// Load custom BBCodes
+		foreach ($this->data_access->get_bbcodes() as $row)
+		{
+			// Insert the board's URL before {LOCAL_URL} tokens
+			$tpl = preg_replace_callback(
+				'#\\{LOCAL_URL\\d*\\}#',
+				function ($m)
+				{
+					return generate_board_url() . '/' . $m[0];
+				},
+				$row['bbcode_tpl']
+			);
+			$this->add_bbcode($configurator, $row['bbcode_match'], $tpl);
+		}
+
+		// Load smilies
+		foreach ($this->data_access->get_smilies() as $row)
+		{
+			$configurator->Emoticons->set(
+				$row['code'],
+				'<img class="smilies" src="{$T_SMILIES_PATH}/' . $this->escape_html_attribute($row['smiley_url']) . '" width="' . $row['smiley_width'] . '" height="' . $row['smiley_height'] . '" alt="{.}" title="' . $this->escape_html_attribute($row['emotion']) . '"/>'
+			);
+		}
+
+		if (isset($configurator->Emoticons))
+		{
+			// Force emoticons to be rendered as text if $S_VIEWSMILIES is not set
+			$configurator->Emoticons->notIfCondition = 'not($S_VIEWSMILIES)';
+
+			// Only parse emoticons at the beginning of the text or if they're preceded by any
+			// one of: a new line, a space, a dot, or a right square bracket
+			$configurator->Emoticons->notAfter = '[^\\n .\\]]';
+
+			// Ignore emoticons that are immediately followed by a "word" character
+			$configurator->Emoticons->notBefore = '\\w';
+		}
+
+		// Load the censored words
+		$censor = $this->data_access->get_censored_words();
+		if (!empty($censor))
+		{
+			// Use a namespaced tag to avoid collisions
+			$configurator->plugins->load('Censor', array('tagName' => 'censor:tag'));
+			foreach ($censor as $row)
+			{
+				$configurator->Censor->add($row['word'], $row['replacement']);
+			}
+		}
+
+		// Load the magic links plugins. We do that after BBCodes so that they use the same tags
+		$this->configure_autolink($configurator);
+
+		// Register some vars with a default value. Those should be set at runtime by whatever calls
+		// the parser
+		$configurator->registeredVars['max_font_size'] = 0;
+		$configurator->registeredVars['max_img_height'] = 0;
+		$configurator->registeredVars['max_img_width'] = 0;
+
+		// Load the Emoji plugin and modify its tag's template to obey viewsmilies
+		$tag = $configurator->Emoji->getTag();
+		$tag->template = '<xsl:choose>
+			<xsl:when test="@tseq">
+				<img alt="{.}" class="emoji" draggable="false" src="//twemoji.maxcdn.com/2/svg/{@tseq}.svg"/>
+			</xsl:when>
+			<xsl:otherwise>
+				<img alt="{.}" class="emoji" draggable="false" src="https://cdn.jsdelivr.net/gh/s9e/emoji-assets-twemoji@11.2/dist/svgz/{@seq}.svgz"/>
+			</xsl:otherwise>
+		</xsl:choose>';
+		$tag->template = '<xsl:choose><xsl:when test="$S_VIEWSMILIES">' . str_replace('class="emoji"', 'class="emoji smilies"', $tag->template) . '</xsl:when><xsl:otherwise><xsl:value-of select="."/></xsl:otherwise></xsl:choose>';
+
+		/**
+		* Modify the s9e\TextFormatter configurator after the default settings are set
+		*
+		* @event core.text_formatter_s9e_configure_after
+		* @var \s9e\TextFormatter\Configurator configurator Configurator instance
+		* @since 3.2.0-a1
+		*/
+		$vars = array('configurator');
+		extract($this->dispatcher->trigger_event('core.text_formatter_s9e_configure_after', compact($vars)));
+
+		return $configurator;
+	}
+
+	/**
+	* Regenerate and cache a new parser and renderer
+	*
+	* @return array Associative array with at least two elements: "parser" and "renderer"
+	*/
+	public function regenerate()
+	{
+		$configurator = $this->get_configurator();
+
+		// Get the censor helper and remove the Censor plugin if applicable
+		if (isset($configurator->Censor))
+		{
+			$censor = $configurator->Censor->getHelper();
+			unset($configurator->Censor);
+			unset($configurator->tags['censor:tag']);
+		}
+
+		$objects = $configurator->finalize();
+
+		/**
+		* Access the objects returned by finalize() before they are saved to cache
+		*
+		* @event core.text_formatter_s9e_configure_finalize
+		* @var array objects Array containing a "parser" object, a "renderer" object and optionally a "js" string
+		* @since 3.2.2-RC1
+		*/
+		$vars = array('objects');
+		extract($this->dispatcher->trigger_event('core.text_formatter_s9e_configure_finalize', compact($vars)));
+
+		$parser   = $objects['parser'];
+		$renderer = $objects['renderer'];
+
+		// Cache the parser as-is
+		$this->cache->put($this->cache_key_parser, $parser);
+
+		// We need to cache the name of the renderer's generated class
+		$renderer_data = array('class' => get_class($renderer));
+		if (isset($censor))
+		{
+			$renderer_data['censor'] = $censor;
+		}
+		$this->cache->put($this->cache_key_renderer, $renderer_data);
+
+		return array('parser' => $parser, 'renderer' => $renderer);
+	}
+
+	/**
+	* Add a BBCode to given configurator
+	*
+	* @param  Configurator $configurator
+	* @param  string       $usage
+	* @param  string       $template
+	* @return void
+	*/
+	protected function add_bbcode(Configurator $configurator, $usage, $template)
+	{
+		try
+		{
+			$configurator->BBCodes->addCustom($usage, new UnsafeTemplate($template));
+		}
+		catch (\Exception $e)
+		{
+			$this->log->add('critical', null, null, 'LOG_BBCODE_CONFIGURATION_ERROR', false, [$usage, $e->getMessage()]);
+		}
+	}
+
+	/**
+	* Configure the Autolink / Autoemail plugins used to linkify text
+	*
+	* @param  \s9e\TextFormatter\Configurator $configurator
+	* @return void
+	*/
+	protected function configure_autolink(Configurator $configurator)
+	{
+		$configurator->plugins->load('Autoemail');
+		$configurator->plugins->load('Autolink', array('matchWww' => true));
+
+		// Add a tag filter that creates a tag that stores and replace the
+		// content of a link created by the Autolink plugin
+		$configurator->Autolink->getTag()->filterChain
+			->add(array($this->link_helper, 'generate_link_text_tag'))
+			->resetParameters()
+			->addParameterByName('tag')
+			->addParameterByName('parser');
+
+		// Create a tag that will be used to display the truncated text by
+		// replacing the original content with the content of the @text attribute
+		$tag = $configurator->tags->add('LINK_TEXT');
+		$tag->attributes->add('text');
+		$tag->template = '<xsl:value-of select="@text"/>';
+
+		$tag->filterChain
+			->add(array($this->link_helper, 'truncate_local_url'))
+			->resetParameters()
+			->addParameterByName('tag')
+			->addParameterByValue(generate_board_url() . '/');
+		$tag->filterChain
+			->add(array($this->link_helper, 'truncate_text'))
+			->resetParameters()
+			->addParameterByName('tag');
+		$tag->filterChain
+			->add(array($this->link_helper, 'cleanup_tag'))
+			->resetParameters()
+			->addParameterByName('tag')
+			->addParameterByName('parser');
+	}
+
+	/**
+	* Escape a literal to be used in an HTML attribute in an XSL template
+	*
+	* Escapes "HTML special chars" for obvious reasons and curly braces to avoid them
+	* being interpreted as an attribute value template
+	*
+	* @param  string $value Original string
+	* @return string        Escaped string
+	*/
+	protected function escape_html_attribute($value)
+	{
+		return htmlspecialchars(strtr($value, ['{' => '{{', '}' => '}}']), ENT_COMPAT | ENT_XML1, 'UTF-8');
+	}
+
+	/**
+	* Return the default BBCodes configuration
+	*
+	* @return array 2D array. Each element has a 'usage' key, a 'template' key, and an optional 'options' key
+	*/
+	protected function get_default_bbcodes($configurator)
+	{
+		// For each BBCode, build an associative array matching style_ids to their template
+		$templates = array();
+		foreach ($this->data_access->get_styles_templates() as $style_id => $data)
+		{
+			foreach ($this->extract_templates($data['template']) as $bbcode_name => $template)
+			{
+				$templates[$bbcode_name][$style_id] = $template;
+			}
+
+			// Add default templates wherever missing, or for BBCodes that were not specified in
+			// this template's bitfield. For instance, prosilver has a custom template for b but its
+			// bitfield does not enable it so the default template is used instead
+			foreach ($this->default_templates as $bbcode_name => $template)
+			{
+				if (!isset($templates[$bbcode_name][$style_id]) || !in_array($bbcode_name, $data['bbcodes'], true))
+				{
+					$templates[$bbcode_name][$style_id] = $template;
+				}
+			}
+		}
+
+		// Replace custom tokens and normalize templates
+		foreach ($templates as $bbcode_name => $style_templates)
+		{
+			foreach ($style_templates as $i => $template)
+			{
+				if (isset($this->custom_tokens[$bbcode_name]))
+				{
+					$template = strtr($template, $this->custom_tokens[$bbcode_name]);
+				}
+
+				$templates[$bbcode_name][$i] = $configurator->templateNormalizer->normalizeTemplate($template);
+			}
+		}
+
+		$bbcodes = array();
+		foreach ($this->default_definitions as $bbcode_name => $usage)
+		{
+			$bbcodes[$bbcode_name] = array(
+				'usage'    => $usage,
+				'template' => $this->merge_templates($templates[$bbcode_name]),
+			);
+		}
+
+		return $bbcodes;
+	}
+
+	/**
+	* Extract and recompose individual BBCode templates from a style's template file
+	*
+	* @param  string $template Style template (bbcode.html)
+	* @return array Associative array matching BBCode names to their template
+	*/
+	protected function extract_templates($template)
+	{
+		// Capture the template fragments
+		// Allow either phpBB template or the Twig syntax
+		preg_match_all('#<!-- BEGIN (.*?) -->(.*?)<!-- END .*? -->#s', $template, $matches, PREG_SET_ORDER) ?:
+			preg_match_all('#{% for (.*?) in .*? %}(.*?){% endfor %}#s', $template, $matches, PREG_SET_ORDER);
+
+		$fragments = array();
+		foreach ($matches as $match)
+		{
+			// Normalize the whitespace
+			$fragment = preg_replace('#>\\n\\t*<#', '><', trim($match[2]));
+
+			$fragments[$match[1]] = $fragment;
+		}
+
+		// Automatically recompose templates split between *_open and *_close
+		foreach ($fragments as $fragment_name => $fragment)
+		{
+			if (preg_match('#^(\\w+)_close$#', $fragment_name, $match))
+			{
+				$bbcode_name = $match[1];
+
+				if (isset($fragments[$bbcode_name . '_open']))
+				{
+					$templates[$bbcode_name] = $fragments[$bbcode_name . '_open'] . '<xsl:apply-templates/>' . $fragment;
+				}
+			}
+		}
+
+		// Manually recompose and overwrite irregular templates
+		$templates['list'] =
+			'<xsl:choose>
+				<xsl:when test="not(@type)">
+					' . $fragments['ulist_open_default'] . '<xsl:apply-templates/>' . $fragments['ulist_close'] . '
+				</xsl:when>
+				<xsl:when test="contains(\'upperlowerdecim\',substring(@type,1,5))">
+					' . $fragments['olist_open'] . '<xsl:apply-templates/>' . $fragments['olist_close'] . '
+				</xsl:when>
+				<xsl:otherwise>
+					' . $fragments['ulist_open'] . '<xsl:apply-templates/>' . $fragments['ulist_close'] . '
+				</xsl:otherwise>
+			</xsl:choose>';
+
+		$templates['li'] = $fragments['listitem'] . '<xsl:apply-templates/>' . $fragments['listitem_close'];
+
+		// Replace the regular quote template with the extended quote template if available
+		if (isset($fragments['quote_extended']))
+		{
+			$templates['quote'] = $fragments['quote_extended'];
+		}
+
+		// The [attachment] BBCode uses the inline_attachment template to output a comment that
+		// is post-processed by parse_attachments()
+		$templates['attachment'] = $fragments['inline_attachment_open'] . '<xsl:comment> ia<xsl:value-of select="@index"/> </xsl:comment><xsl:value-of select="@filename"/><xsl:comment> ia<xsl:value-of select="@index"/> </xsl:comment>' . $fragments['inline_attachment_close'];
+
+		// Add fragments as templates
+		foreach ($fragments as $fragment_name => $fragment)
+		{
+			if (preg_match('#^\\w+$#', $fragment_name))
+			{
+				$templates[$fragment_name] = $fragment;
+			}
+		}
+
+		// Keep only templates that are named after an existing BBCode
+		$templates = array_intersect_key($templates, $this->default_definitions);
+
+		return $templates;
+	}
+
+	/**
+	* Merge the templates from any number of styles into one BBCode template
+	*
+	* When multiple templates are available for the same BBCode (because of multiple styles) we
+	* merge them into a single template that uses an xsl:choose construct that determines which
+	* style to use at rendering time.
+	*
+	* @param  array  $style_templates Associative array matching style_ids to their template
+	* @return string
+	*/
+	protected function merge_templates(array $style_templates)
+	{
+		// Return the template as-is if there's only one style or all styles share the same template
+		if (count(array_unique($style_templates)) === 1)
+		{
+			return end($style_templates);
+		}
+
+		// Group identical templates together
+		$grouped_templates = array();
+		foreach ($style_templates as $style_id => $style_template)
+		{
+			$grouped_templates[$style_template][] = '$STYLE_ID=' . $style_id;
+		}
+
+		// Sort templates by frequency descending
+		$templates_cnt = array_map('sizeof', $grouped_templates);
+		array_multisort($grouped_templates, $templates_cnt);
+
+		// Remove the most frequent template from the list; It becomes the default
+		reset($grouped_templates);
+		$default_template = key($grouped_templates);
+		unset($grouped_templates[$default_template]);
+
+		// Build an xsl:choose switch
+		$template = '<xsl:choose>';
+		foreach ($grouped_templates as $style_template => $exprs)
+		{
+			$template .= '<xsl:when test="' . implode(' or ', $exprs) . '">' . $style_template . '</xsl:when>';
+		}
+		$template .= '<xsl:otherwise>' . $default_template . '</xsl:otherwise></xsl:choose>';
+
+		return $template;
+	}
+}