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<?php
/**
* Output functions
* Processing text for output, formatting HTML,
*
* @package Elgg
* @subpackage Core
* @author Curverider Ltd <info@elgg.com>
* @link http://elgg.org/
*/
/**
* Takes a string and turns any URLs into formatted links
*
* @param string $text The input string
* @return string The output stirng with formatted links
**/
function parse_urls($text) {
// @todo this causes problems with <attr = "val">
// must be ing <attr="val"> format (no space).
// By default htmlawed rewrites tags to this format.
// if PHP supported conditional negative lookbehinds we could use this:
// $r = preg_replace_callback('/(?<!=)(?<![ ])?(?<!["\'])((ht|f)tps?:\/\/[^\s\r\n\t<>"\'\!\(\),]+)/i',
//
// we can put , in the list of excluded char but need to keep . because of domain names.
// it is removed in the callback.
$r = preg_replace_callback('/(?<!=)(?<!["\'])((ht|f)tps?:\/\/[^\s\r\n\t<>"\'\!\(\),]+)/i',
create_function(
'$matches',
'
$url = $matches[1];
$period = \'\';
if (substr($url, -1, 1) == \'.\') {
$period = \'.\';
$url = trim($url, \'.\');
}
$urltext = str_replace("/", "/<wbr />", $url);
return "<a href=\"$url\" style=\"text-decoration:underline;\">$urltext</a>$period";
'
), $text);
return $r;
}
/**
* Create paragraphs from text with line spacing
* Borrowed from Wordpress.
*
**/
function autop($pee, $br = 1) {
$pee = $pee . "\n"; // just to make things a little easier, pad the end
$pee = preg_replace('|<br />\s*<br />|', "\n\n", $pee);
// Space things out a little
$allblocks = '(?:table|thead|tfoot|caption|colgroup|tbody|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|form|map|area|blockquote|address|math|style|input|p|h[1-6]|hr)';
$pee = preg_replace('!(<' . $allblocks . '[^>]*>)!', "\n$1", $pee);
$pee = preg_replace('!(</' . $allblocks . '>)!', "$1\n\n", $pee);
$pee = str_replace(array("\r\n", "\r"), "\n", $pee); // cross-platform newlines
if ( strpos($pee, '<object') !== false ) {
$pee = preg_replace('|\s*<param([^>]*)>\s*|', "<param$1>", $pee); // no pee inside object/embed
$pee = preg_replace('|\s*</embed>\s*|', '</embed>', $pee);
}
$pee = preg_replace("/\n\n+/", "\n\n", $pee); // take care of duplicates
$pee = preg_replace('/\n?(.+?)(?:\n\s*\n|\z)/s', "<p>$1</p>\n", $pee); // make paragraphs, including one at the end
$pee = preg_replace('|<p>\s*?</p>|', '', $pee); // under certain strange conditions it could create a P of entirely whitespace
$pee = preg_replace('!<p>([^<]+)\s*?(</(?:div|address|form)[^>]*>)!', "<p>$1</p>$2", $pee);
$pee = preg_replace( '|<p>|', "$1<p>", $pee );
$pee = preg_replace('!<p>\s*(</?' . $allblocks . '[^>]*>)\s*</p>!', "$1", $pee); // don't pee all over a tag
$pee = preg_replace("|<p>(<li.+?)</p>|", "$1", $pee); // problem with nested lists
$pee = preg_replace('|<p><blockquote([^>]*)>|i', "<blockquote$1><p>", $pee);
$pee = str_replace('</blockquote></p>', '</p></blockquote>', $pee);
$pee = preg_replace('!<p>\s*(</?' . $allblocks . '[^>]*>)!', "$1", $pee);
$pee = preg_replace('!(</?' . $allblocks . '[^>]*>)\s*</p>!', "$1", $pee);
if ($br) {
$pee = preg_replace_callback('/<(script|style).*?<\/\\1>/s', create_function('$matches', 'return str_replace("\n", "<WPPreserveNewline />", $matches[0]);'), $pee);
$pee = preg_replace('|(?<!<br />)\s*\n|', "<br />\n", $pee); // optionally make line breaks
$pee = str_replace('<WPPreserveNewline />', "\n", $pee);
}
$pee = preg_replace('!(</?' . $allblocks . '[^>]*>)\s*<br />!', "$1", $pee);
$pee = preg_replace('!<br />(\s*</?(?:p|li|div|dl|dd|dt|th|pre|td|ul|ol)[^>]*>)!', '$1', $pee);
// if (strpos($pee, '<pre') !== false) {
// mind the space between the ? and >. Only there because of the comment.
// $pee = preg_replace_callback('!(<pre.*? >)(.*?)</pre>!is', 'clean_pre', $pee );
// }
$pee = preg_replace( "|\n</p>$|", '</p>', $pee );
return $pee;
}
/**
* Returns an excerpt.
* Will return up to n chars stopping at the nearest space.
* If no spaces are found (like in Japanese) will crop off at the
* n char mark. Adds ... if any text was chopped.
*
* @param string $text
* @param int $num_chars Return a string up to $num_chars long
* @return string
* @since 1.7.2
*/
function elgg_make_excerpt($text, $num_chars = 250) {
$text = trim(elgg_strip_tags($text));
$string_length = elgg_strlen($text);
if ($string_length <= $num_chars) {
return $text;
}
// handle cases
$excerpt = elgg_substr($text, 0, $num_chars);
$space = elgg_strrpos($excerpt, ' ', 0);
// don't crop if can't find a space.
if ($space === FALSE) {
$space = $num_chars;
}
$excerpt = trim(elgg_substr($excerpt, 0, $space));
if ($string_length != elgg_strlen($excerpt)) {
$excerpt .= '…';
}
return $excerpt;
}
/**
* Handles formatting of ampersands in urls
*
* @param string $url
* @return string
* @since 1.7.1
*/
function elgg_format_url($url) {
return preg_replace('/&(?!amp;)/', '&', $url);
}
/**
* When given a title, returns a version suitable for inclusion in a URL
*
* @param string $title The title
* @return string The optimised title
*/
function friendly_title($title) {
return elgg_view('output/friendlytitle', array('title' => $title));
}
/**
* Displays a UNIX timestamp in a friendly way (eg "less than a minute ago")
*
* @param int $time A UNIX epoch timestamp
* @return string The friendly time
*/
function friendly_time($time) {
return elgg_view('output/friendlytime', array('time' => $time));
}
/**
* Strip tags and offer plugins the chance.
* Plugins register for output:strip_tags plugin hook.
* Original string included in $params['original_string']
*
* @param string $string Formatted string
* @return string String run through strip_tags() and any plugin hooks.
*/
function elgg_strip_tags($string) {
$params['original_string'] = $string;
$string = strip_tags($string);
$string = trigger_plugin_hook('output', 'strip_tags', $params, $string);
return $string;
}
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