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StudipCoreFormat.php 22.64 KiB
<?php
/**
* StudipCoreFormat.php - simple Stud.IP text markup parser
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* @author Elmar Ludwig
* @license http://www.gnu.org/licenses/gpl-2.0.html GPL version 2
* @category Stud.IP
*/
class StudipCoreFormat extends TextFormat
{
/**
* list of global Stud.IP markup rules
*/
private static $studip_rules = [
// heading level 1-4
'heading' => [
'start' => '^(!{1,4})([^\n]+)\n*',
'callback' => 'StudipCoreFormat::markupHeading'
],
// horizontal rule
'hrule' => [
'start' => '^--(\d?)$',
'callback' => 'StudipCoreFormat::markupHorizontalRule'
],
// list and table
'list' => [
'start' => '(^[=-]+ [^\n]+\n?)+',
'callback' => 'StudipCoreFormat::markupList'
],
'table' => [
'start' => '(^\|[^\n]*\|[^\n]*\n?)+',
'callback' => 'StudipCoreFormat::markupTable'
],
// block indent
'indent' => [
'start' => '(^ [^\n]+\n?)+',
'callback' => 'StudipCoreFormat::markupIndent'
],
// basic text formatting
'bold' => [
'start' => '\*\*',
'end' => '\*\*',
'callback' => 'StudipCoreFormat::markupText'
],
'italics' => [
'start' => '%%',
'end' => '%%',
'callback' => 'StudipCoreFormat::markupText'
],
'underline' => [
'start' => '__',
'end' => '__',
'callback' => 'StudipCoreFormat::markupText'
],
'verb' => [
'start' => '##',
'end' => '##',
'callback' => 'StudipCoreFormat::markupText'
], 'big' => [
'start' => '(\+\+)+',
'end' => '(\+\+)+',
'callback' => 'StudipCoreFormat::markupTextSize'
],
'small' => [
'start' => '(--)+',
'end' => '(--)+',
'callback' => 'StudipCoreFormat::markupTextSize'
],
'super' => [
'start' => '>>',
'end' => '>>',
'callback' => 'StudipCoreFormat::markupText'
],
'sub' => [
'start' => '<<',
'end' => '<<',
'callback' => 'StudipCoreFormat::markupText'
],
'strike' => [
'start' => '\{-',
'end' => '-\}',
'callback' => 'StudipCoreFormat::markupText'
],
// basic text formatting (simple form)
'simple_bold' => [
'start' => '(?<=\s|^)\*(\S+)\*(?=\s|$)',
'callback' => 'StudipCoreFormat::markupTextSimple'
],
'simple_italics' => [
'start' => '(?<=\s|^)%(\S+)%(?=\s|$)',
'callback' => 'StudipCoreFormat::markupTextSimple'
],
'simple_underline' => [
'start' => '(?<=\s|^)_(\S+)_(?=\s|$)',
'callback' => 'StudipCoreFormat::markupTextSimple'
],
'simple_verb' => [
'start' => '(?<=\s|^)#(\S+)#(?=\s|$)',
'callback' => 'StudipCoreFormat::markupTextSimple'
],
'simple_big' => [
'start' => '(?<=\s|^)\+(\S+)\+(?=\s|$)',
'callback' => 'StudipCoreFormat::markupTextSimple'
],
'simple_small' => [
'start' => '(?<=\s|^)-(\S+)-(?=\s|$)',
'callback' => 'StudipCoreFormat::markupTextSimple'
],
'simple_super' => [
'start' => '(?<=\s|^)>(\S+)>(?=\s|$)',
'callback' => 'StudipCoreFormat::markupTextSimple'
],
'simple_sub' => [
'start' => '(?<=\s|^)<(\S+)<(?=\s|$)',
'callback' => 'StudipCoreFormat::markupTextSimple'
],
// preformatted text, quote, nop and code
'pre' => [
'start' => '\[pre\]',
'end' => '\[\/pre\]',
'callback' => 'StudipCoreFormat::markupPreformat'
],
'quote' => [
'start' => '\[quote(=.*?)?\]',
'end' => '\[\/quote\]\s*',
'callback' => 'StudipCoreFormat::markupQuote' ],
'nop' => [
'start' => '\[nop\](.*?)\[\/nop\]',
'callback' => 'StudipCoreFormat::markupNoFormat'
],
'code' => [
'start' => '\[code(=.*?)?\](.*?)\[\/code\]',
'callback' => 'StudipCoreFormat::markupCode'
],
'media' => [
'start' => '\[(img|flash|audio|video)(.*?)\](.*?)(?=\s|$)',
'callback' => 'StudipCoreFormat::markupMedia'
],
'emails' => [
'start' => '(?xi:
# ensure block is preceded by whitspace, line start or closing
# tag
(?<=\s|^|\>)
# capture displayed text
(?:\[([^\n\f\]]+?)\])?
# capture actual email address
([\w.!#%+\-]+@([[:alnum:]\-.]+\.[[:alnum:]\-.]{2,}))
# ensure block is succeeded by white space or line end
(?=\s|$)
)',
'callback' => 'StudipCoreFormat::markupEmails'
],
'htmlAnchor' => [
# avoid replacing html links by studip's links-markup
# match <a ...="..."> ... </a>
'start' => '(?xi: <\s* a (?:\s(?:\s* \w+ \s*=\s* "[^"]*" )*)? \s*>)',
'end' => '(?xi: <\s* \/\s* a \s*>)',
'callback' => 'StudipCoreFormat::htmlAnchor'
],
'htmlImg' => [
# avoid replacing img links by studip's links-markup
# match <img ...="..." />
'start' => '(?xi:
# match tag start: <img
<\s*img
# match optional attributes
(\s(\s*
\w+ # attribute name
(\s*=\s*
("[^\"]*"|\'[^\']*\'|[^\s]*) # attribute value
)?
)+)?
# match tag end: \/>
\s*\/?\s*>
)',
'callback' => 'StudipCoreFormat::htmlImg'
],
'links' => [
// markup: [text]url
//
// To set URLs apart from normal text, scheme and host are
// obligatory. URLs are based on, but allow more than RFC3986 in
// order to simplify the regular expression.
//
// http://tools.ietf.org/html/rfc3986
'start' => '(?xi:
# capture 1: displayed text
(?:\[( [^\n\f\]]+ )\])?
# capture 2: URL \b(
# scheme
[a-z][a-z0-9\+\-\.]*:\/\/
# user:password@host:port\/path?query#fragment
[a-zA-Z0-9\x{00a0}-\x{d7ff}\x{f900}-\x{fdcf}\x{fdf0}-\x{ffef}_\-\.~!$&\'\(\)\[\]*+,;=%:@\/?#]+
)
)',
'callback' => 'StudipCoreFormat::markupLinks'
],
'tex' => [
'start' => '\[tex\]',
'end' => '\[\/tex\]',
'callback' => 'StudipCoreFormat::markupTexFormat'
],
];
/**
* Returns the list of global Stud.IP markup rules as an array.
* Each entry has the following attributes: 'start', 'end' and
* 'callback'. The rule name is used as the entry's array key.
*
* @return array list of all markup rules
*/
public static function getStudipMarkups()
{
return self::$studip_rules;
}
/**
* Adds a new markup rule to the global Stud.IP markup set. This can
* also be used to replace an existing markup rule. The end regular
* expression is optional (i.e. may be NULL) to indicate that this
* rule has an empty content model. The callback is called whenever
* the rule matches and is passed the following arguments:
*
* - $markup the markup parser object
* - $matches match results of preg_match for $start
* - $contents (parsed) contents of this markup rule
*
* Sometimes you may want your rule to apply before another specific rule
* will apply. For this case the parameter $before defines a rulename of
* existing markup, before which your rule should apply.
*
* @param string $name name of this rule
* @param string $start start regular expression
* @param string $end end regular expression (optional)
* @param callback $callback function generating output of this rule
* @param string $before mark before which rule this rule should be appended
*/
public static function addStudipMarkup($name, $start, $end, $callback, $before = null)
{
$inserted = false;
foreach (self::$studip_rules as $rule_name => $rule) {
if ($rule_name === $before) {
self::$studip_rules[$name] = compact('start', 'end', 'callback');
$inserted = true;
}
if ($inserted) {
unset(self::$studip_rules[$rule_name]);
self::$studip_rules[$rule_name] = $rule;
}
}
if (!$inserted) {
self::$studip_rules[$name] = $end
? compact('start', 'end', 'callback')
: compact('start', 'callback');
}
}
/**
* Returns a single markup-rule if it exists.
* @return array: array('start' => "...", 'end' => "...", 'callback' => "...")
*/
public static function getStudipMarkup($name) {
return self::$studip_rules[$name];
}
/**
* Removes a markup rule from the global Stud.IP markup set.
*
* @param string $name name of the rule
*/
public static function removeStudipMarkup($name)
{
unset(self::$studip_rules[$name]);
}
/**
* Initializes a new StudipCoreFormat instance.
*/
public function __construct()
{
parent::__construct(self::getStudipMarkups());
}
/**
* Stud.IP markup for headings
*/
protected static function markupHeading($markup, $matches)
{
$level = max(1, 5 - mb_strlen($matches[1]));
$text = $markup->format($matches[2]);
return sprintf('<h%d class="content">%s</h%d>', $level, $text, $level);
}
/**
* Stud.IP markup for horizontal rule
*/
protected static function markupHorizontalRule($markup, $matches)
{
return sprintf('<hr class="content"%s>',
$matches[1] ? ' style="height: '.((int) $matches[1]).'px"' : ""
);
}
/**
* Basic text formatting: bold, italics, underline, sup, sub etc.
*/
protected static function markupText($markup, $matches, $contents)
{
static $tag = [
'**' => 'strong',
'%%' => 'em',
'__' => 'u',
'##' => 'tt',
'>>' => 'sup',
'<<' => 'sub',
'{-' => 's'
];
$key = $matches[0];
return sprintf('<%s>%s</%s>', $tag[$key], $contents, $tag[$key]);
}
/**
* Text size formatting: small and small
*/ protected static function markupTextSize($markup, $matches, $contents)
{
static $tag = [
'++' => 'big',
'--' => 'small',
];
$key = $matches[1];
$level = mb_strlen($matches[0]) / 2;
$open = str_repeat('<' . $tag[$key] . '>', $level);
$close = str_repeat('</' . $tag[$key] . '>', $level);
return $open . $contents . $close;
}
/**
* Basic text formatting: bold, italics, underline etc. (simple form)
*/
protected static function markupTextSimple($markup, $matches)
{
static $tag = [
'*' => 'strong',
'%' => 'em',
'_' => 'u',
'#' => 'tt',
'+' => 'big',
'-' => 'small',
'>' => 'sup',
'<' => 'sub'
];
$key = $matches[0][0];
$text = str_replace($key, ' ', $matches[1]);
return sprintf('<%s>%s</%s>', $tag[$key], $markup->quote($text), $tag[$key]);
}
/**
* Stud.IP markup for lists (may be nested)
*/
protected static function markupList($markup, $matches)
{
$rows = explode("\n", rtrim($matches[0]));
$indent = 0;
$result = '';
foreach ($rows as $row) {
list($level, $text) = explode(' ', $row, 2);
$level = mb_strlen($level);
if ($indent < $level) {
for (; $indent < $level; ++$indent) {
$type = $row[$indent] == '=' ? 'ol' : 'ul';
$result .= sprintf('<%s><li>', $type);
$types[] = $type;
}
} else {
for (; $indent > $level; --$indent) {
$result .= sprintf('</li></%s>', array_pop($types));
}
$result .= '</li><li>';
}
$result .= $markup->format($text);
}
for (; $indent > 0; --$indent) {
$result .= sprintf('</li></%s>', array_pop($types)); }
return $result;
}
/**
* Stud.IP markup for tables
*/
protected static function markupTable($markup, $matches)
{
$rows = explode("\n", rtrim($matches[0]));
$result = '<table class="content">';
foreach ($rows as $row) {
$cells = explode('|', trim(trim($row), '|'));
$result .= '<tr>';
foreach ($cells as $cell) {
$result .= '<td>';
$result .= $markup->format(trim($cell));
$result .= '</td>';
}
$result .= '</tr>';
}
$result .= '</table>';
return $result;
}
/**
* Stud.IP markup for indented paragraphs
*/
protected static function markupIndent($markup, $matches)
{
$text = preg_replace('/^ +/', '', $matches[0]);
$text = preg_replace('/^ /m', '', $text);
return sprintf('<div class="indent">%s</div>', $markup->format($text));
}
/**
* Stud.IP markup for preformatted text
*/
protected static function markupPreformat($markup, $matches, $contents)
{
return sprintf('<pre>%s</pre>', trim($contents));
}
/**
* Stud.IP markup for quoted text
*/
protected static function markupQuote($markup, $matches, $contents)
{
if (mb_strlen($matches[1]) > 1) {
$title = sprintf(_('%s hat geschrieben:'), $markup->format(mb_substr($matches[1], 1)));
return sprintf('<blockquote><div class="author">%s</div>%s</blockquote>',
$title, trim($contents));
} else {
return sprintf('<blockquote>%s</blockquote>',
trim($contents));
}
}
/**
* Stud.IP markup for unformatted text
*/
protected static function markupNoFormat($markup, $matches)
{ return $markup->quote($matches[1]);
}
/**
* Stud.IP markup for (PHP) source code
*/
protected static function markupCode($markup, $matches)
{
$codetype = "";
if (mb_strlen($matches[1])) {
$codetype = " ".decodeHTML(trim(mb_substr($matches[1], 1)), ENT_QUOTES);
}
$code = decodeHTML(trim($matches[2]), ENT_QUOTES);
return sprintf('<pre class="usercode %1$s"><code class="%1$s">%2$s</code></pre>',
htmlReady($codetype),
htmlReady($code));
}
/**
* Stud.IP markup for email-adresses
*/
protected static function markupEmails($markup, $matches)
{
$link_text = $matches[1] ?: $matches[2];
$email = $matches[2];
$domain = $matches[3];
$intern = $domain === $_SERVER['HTTP_HOST'];
return sprintf('<a href="mailto:%1$s">%2$s</a>',
$email,
$link_text
);
}
/**
* Stud.IP markup for images, audio, video and flash-films
*/
protected static function markupMedia($markup, $matches)
{
$tag = $matches[1];
$params = explode(":",$matches[2]);
$url = $matches[3];
$whitespace = $matches[4];
foreach ($params as $key => $param) {
if ($param) {
if (is_numeric($param)) {
$width = $param;
} elseif(in_array($param, words("left center right"))) {
$position = $param;
} elseif($key === 0 && $param[0] === "=") {
$title = mb_substr($param, 1);
} elseif($key < count($params) - 1) {
$virtual_url = $param.":".$params[$key + 1];
if (isURL($virtual_url)) {
$link = $virtual_url;
}
}
}
}
$format_strings = [
'img' => '<img src="%s" style="%s" title="%s" alt="%s">',
'audio' => '<audio src="%s" style="%s" title="%s" alt="%s" controls></audio>',
'video' => '<video src="%s" style="%s" title="%s" alt="%s" controls></video>'
];
$url = TransformInternalLinks($url);
$pu = @parse_url($url); if (($pu['scheme'] == 'http' || $pu['scheme'] == 'https')
&& ($pu['host'] == $_SERVER['HTTP_HOST'] || $pu['host'].':'.$pu['port'] == $_SERVER['HTTP_HOST'])
&& mb_strpos($pu['path'], $GLOBALS['CANONICAL_RELATIVE_PATH_STUDIP']) === 0) {
$intern = true;
$checkpath = urldecode(mb_substr($pu['path'], mb_strlen($GLOBALS['CANONICAL_RELATIVE_PATH_STUDIP'])));
if (mb_strpos($checkpath, '../') === false) {
list($pu['first_target']) = explode('/', $checkpath);
} else {
$pu['first_target'] = false;
}
}
$LOAD_EXTERNAL_MEDIA = Config::GetInstance()->getValue('LOAD_EXTERNAL_MEDIA');
if ($intern
&& !in_array($pu['first_target'], ['sendfile.php','download','assets','pictures'])
&& !($pu['first_target'] === 'dispatch.php' && mb_strpos($pu['path'], 'dispatch.php/document/download') !== false))
{
return $matches[0];
} elseif ((!$LOAD_EXTERNAL_MEDIA || $LOAD_EXTERNAL_MEDIA === 'deny') && !$intern) {
return $matches[0];
}
//Mediaproxy?
if (!$intern && $LOAD_EXTERNAL_MEDIA === "proxy" && Seminar_Session::is_current_session_authenticated()) {
$media_url = $GLOBALS['ABSOLUTE_URI_STUDIP'] . 'dispatch.php/media_proxy?url=' . urlencode(decodeHTML(idna_link($url)));
} else {
$media_url = idna_link($url);
}
if ($tag === "flash") {
$width = $width ? $width : 200;
$height = round($width * 0.75);
$flash_config = $width > 200 ? $GLOBALS['FLASHPLAYER_DEFAULT_CONFIG_MAX'] : $GLOBALS['FLASHPLAYER_DEFAULT_CONFIG_MIN'];
$media = '<object type="application/x-shockwave-flash" id="FlashPlayer" data="'.Assets::url().'flash/player_flv.swf" width="'.$width.'" height="'.$height.'">
<param name="movie" value="'.Assets::url().'flash/player_flv.swf">
<param name="allowFullScreen" value="true">
<param name="FlashVars" value="flv='.urlencode(decodeHTML($media_url)).'&startimage='.$link.$flash_config.'">
<embed src="'.Assets::url().'flash/player_flv.swf" movie="$media_url" type="application/x-shockwave-flash" FlashVars="flv='.urlencode(decodeHTML($media_url)).'&startimage='.$link.$flash_config.'">
</object>';
} else {
$media = sprintf($format_strings[$tag],
$media_url,
isset($width) ? "width: ".$width."px;" : "",
$title,
$title
);
}
if ($tag === 'audio') {
$random_id = 'audio-' . mb_substr(md5(uniqid('audio', true)), -8);
$media = str_replace('<audio ', '<audio id="' . $random_id . '" onerror="STUDIP.Audio.handle(this);" ', $media);
}
if ($link && $tag === "img") {
$media = sprintf('<a href="%s"%s>%s</a>',
$link,
!isLinkIntern($link) ? ' target="_blank" rel="noreferrer noopener"' : "",
$media
);
}
if ($position) {
$media = '<div style="text-align: '.$position.'">'.$media.'</div>';
}
$media .= $whitespace;
return $media;
}
/**
* Stud.IP markup for hyperlinks (intern, extern).
* Has lower priority than [code], [img], etc
*/ protected static function markupLinks($markup, $matches)
{
if ($markup->isInsideOf('htmlAnchor') || $markup->isInsideOf('htmlImg')) {
return $matches[0];
}
$url = $matches[2];
$title = $matches[1] ?: $url;
// Remove closing bracket if not part of url
$postfix = '';
if ($title === $url
&& preg_match('/\)[\.,]?$/', $url, $match)
&& substr_count($url, '(') !== substr_count($url, ')'))
{
$title = $url = mb_substr($url, 0, -mb_strlen($match[0]));
$postfix = $match[0];
}
$intern = isLinkIntern($url);
$url = TransformInternalLinks($url);
$linkmarkup = clone $markup;
$linkmarkup->removeMarkup('links');
$linkmarkup->removeMarkup('wiki-links');
if (strpos($url, 'mailto:') === 0) {
return sprintf(
'<a href="%1$s">%2$s</a>%3$s',
$url,
$linkmarkup->format($title),
$postfix
);
} else {
return sprintf(
'<a class="%s" href="%s"%s>%s</a>%s',
$intern ? 'link-intern' : 'link-extern',
$url,
$intern ? '' : ' target="_blank" rel="noreferrer noopener"',
$linkmarkup->format($title),
$postfix
);
}
}
protected static function htmlAnchor($markup, $matches, $contents)
{
return $matches[0] . $contents . '</a>';
}
protected static function htmlImg($markup, $matches, $contents)
{
return $matches[0];
}
/**
* Stud.IP markup for tex tags
*/
protected static function markupTexformat($markup, $matches, $contents)
{
return sprintf('<span class="math-tex">\\(%s\\)</span>', trim($contents));
}
}