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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;
$pattern = get_shortcode_regex();
return preg_replace_callback('/'.$pattern.'/s', 'do_shortcode_tag', $content);
}
function get_shortcode_regex() {
global $shortcode_tags;
$tagnames = array_keys($shortcode_tags);
$tagregexp = join( '|', array_map('preg_quote', $tagnames) );
return '\[('.$tagregexp.')\b(.*?)(?:(\/))?\](?:(.+?)\[\/\1\])?';
}
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|$)|(\w+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/';
$text = preg_replace("/[\x{00a0}\x{200b}]+/u", " ", $text);
if ( preg_match_all($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($m[6]);
elseif (isset($m[7]) and strlen($m[7]))
$atts[] = stripcslashes($m[7]);
elseif (isset($m[8]))
$atts[] = stripcslashes($m[8]);
}
} else {
$atts = ltrim($text);
}
return $atts;
}
function shortcode_atts($pairs, $atts) {
$atts = (array)$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_filter('the_content', 'do_shortcode', 11); // AFTER wpautop()
?>
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