WordPress/wp-includes/shortcodes.php

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<?php
/*
An API for creating shortcode tags that support attributes and enclosed content, such as:
[shortcode /]
[shortcode foo="bar" baz="bing" /]
[shortcode foo="bar"]content[/shortcode]
tag and attrbute parsing regexp code based on the Textpattern tag parser.
To apply shortcode tags to content:
$out = do_shortcode($content);
Simplest example of a shortcode tag using the API:
// [footag foo="bar"]
function footag_func($atts) {
return "foo = {$atts[foo]}";
}
add_shortcode('footag', 'footag_func');
Example with nice attribute defaults:
// [bartag foo="bar"]
function bartag_func($atts) {
extract(shortcode_atts(array(
'foo' => 'no foo',
'baz' => 'default baz',
), $atts));
return "foo = {$foo}";
}
add_shortcode('bartag', 'bartag_func');
Example with enclosed content:
// [baztag]content[/baztag]
function baztag_func($atts, $content='') {
return "content = $content";
}
add_shortcode('baztag', 'baztag_func');
*/
$shortcode_tags = array();
function add_shortcode($tag, $func) {
global $shortcode_tags;
if ( is_callable($func) )
$shortcode_tags[$tag] = $func;
}
function remove_shortcode($tag) {
global $shortcode_tags;
unset($shortcode_tags[$tag]);
}
function remove_all_shortcodes() {
global $shortcode_tags;
$shortcode_tags = array();
}
function do_shortcode($content) {
global $shortcode_tags;
if (empty($shortcode_tags) || !is_array($shortcode_tags))
return $content;
$tagnames = array_keys($shortcode_tags);
$tagregexp = join( '|', array_map('preg_quote', $tagnames) );
$pattern = '/\[('.$tagregexp.')\b(.*?)(?:(\/))?\](?:(.+?)\[\/\1\])?/s';
return preg_replace_callback($pattern, 'do_shortcode_tag', $content);
}
function do_shortcode_tag($m) {
global $shortcode_tags;
$tag = $m[1];
$attr = shortcode_parse_atts($m[2]);
if ( isset($m[4]) ) {
// enclosing tag - extra parameter
return call_user_func($shortcode_tags[$tag], $attr, $m[4]);
} else {
// self-closing tag
return call_user_func($shortcode_tags[$tag], $attr);
}
}
function shortcode_parse_atts($text) {
$atts = array();
$pattern = '/(\w+)\s*=\s*"([^"]*)"(?:\s|$)|(\w+)\s*=\s*\'([^\']*)\'(?:\s|$)|(\w+)\s*=\s*([^\s\'"]+)(?:\s|$)/';
if ( preg_match_all($pattern, $text, $match, PREG_SET_ORDER) ) {
foreach ($match as $m) {
if (!empty($m[1]))
$atts[strtolower($m[1])] = stripcslashes($m[2]);
elseif (!empty($m[3]))
$atts[strtolower($m[3])] = stripcslashes($m[4]);
elseif (!empty($m[5]))
$atts[strtolower($m[5])] = stripcslashes($m[6]);
}
}
return $atts;
}
function shortcode_atts($pairs, $atts) {
$out = array();
foreach($pairs as $name => $default) {
if ( array_key_exists($name, $atts) )
$out[$name] = $atts[$name];
else
$out[$name] = $default;
}
return $out;
}
add_shortcode('gallery', 'gallery_shortcode');
function gallery_shortcode($attr) {
global $post;
// Allow plugins/themes to override the default gallery template.
$output = apply_filters('post_gallery', '', $attr);
if ( $output != '' )
return $output;
$attachments = get_children("post_parent=$post->ID&post_type=attachment&orderby=\"menu_order ASC, ID ASC\"");
/*
foreach ( $attachments as $id => $attachment ) {
$meta = get_post_custom($id);
if ( $meta ) foreach ( $meta as $k => $v )
$attachments[$id]->$k = $v;
if ( isset($attachments[$id]->_wp_attachment_metadata[0]) )
$attachments[$id]->meta = unserialize($attachments[$id]->_wp_attachment_metadata[0]);
}
*/
$output = "
<style type='text/css'>
.gallery {
margin: auto;
}
.gallery div {
float: left;
margin-top: 10px;
text-align: center;
width: 33%; }
.gallery img {
border: 2px solid #cfcfcf;
}
</style>
<div class='gallery'>
";
if ( !empty($attachments) ) foreach ( $attachments as $id => $attachment ) {
$src = wp_get_attachment_thumb_url($id);
$href = get_attachment_link($id);
$output .= "
<div>
<a href='$href'><img src='$src' alt='$attachment->post_title' /></a>
</div>
";
if ( ++$i % 3 == 0 )
$output .= '<br style="clear: both" />';
}
$output .= "
</div>
";
return $output;
}
add_filter('the_content', 'do_shortcode');
?>