135 lines
3.0 KiB
PHP
135 lines
3.0 KiB
PHP
<?php
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/*
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An API for creating shortcode tags that support attributes and enclosed content, such as:
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[shortcode /]
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[shortcode foo="bar" baz="bing" /]
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[shortcode foo="bar"]content[/shortcode]
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tag and attrbute parsing regexp code based on the Textpattern tag parser.
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To apply shortcode tags to content:
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$out = do_shortcode($content);
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Simplest example of a shortcode tag using the API:
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// [footag foo="bar"]
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function footag_func($atts) {
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return "foo = {$atts[foo]}";
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}
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add_shortcode('footag', 'footag_func');
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Example with nice attribute defaults:
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// [bartag foo="bar"]
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function bartag_func($atts) {
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extract(shortcode_atts(array(
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'foo' => 'no foo',
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'baz' => 'default baz',
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), $atts));
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return "foo = {$foo}";
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}
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add_shortcode('bartag', 'bartag_func');
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Example with enclosed content:
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// [baztag]content[/baztag]
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function baztag_func($atts, $content='') {
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return "content = $content";
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}
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add_shortcode('baztag', 'baztag_func');
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*/
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$shortcode_tags = array();
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function add_shortcode($tag, $func) {
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global $shortcode_tags;
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if ( is_callable($func) )
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$shortcode_tags[$tag] = $func;
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}
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function remove_shortcode($tag) {
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global $shortcode_tags;
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unset($shortcode_tags[$tag]);
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}
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function remove_all_shortcodes() {
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global $shortcode_tags;
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$shortcode_tags = array();
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}
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function do_shortcode($content) {
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global $shortcode_tags;
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if (empty($shortcode_tags) || !is_array($shortcode_tags))
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return $content;
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$tagnames = array_keys($shortcode_tags);
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$tagregexp = join( '|', array_map('preg_quote', $tagnames) );
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$pattern = '/\[('.$tagregexp.')\b(.*?)(?:(\/))?\](?:(.+?)\[\/\1\])?/s';
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return preg_replace_callback($pattern, 'do_shortcode_tag', $content);
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}
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function do_shortcode_tag($m) {
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global $shortcode_tags;
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$tag = $m[1];
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$attr = shortcode_parse_atts($m[2]);
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if ( isset($m[4]) ) {
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// enclosing tag - extra parameter
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return call_user_func($shortcode_tags[$tag], $attr, $m[4]);
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} else {
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// self-closing tag
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return call_user_func($shortcode_tags[$tag], $attr);
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}
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}
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function shortcode_parse_atts($text) {
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$atts = array();
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$pattern = '/(\w+)\s*=\s*"([^"]*)"(?:\s|$)|(\w+)\s*=\s*\'([^\']*)\'(?:\s|$)|(\w+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|(\S+)(?:\s|$)/';
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if ( preg_match_all($pattern, $text, $match, PREG_SET_ORDER) ) {
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foreach ($match as $m) {
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if (!empty($m[1]))
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$atts[strtolower($m[1])] = stripcslashes($m[2]);
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elseif (!empty($m[3]))
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$atts[strtolower($m[3])] = stripcslashes($m[4]);
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elseif (!empty($m[5]))
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$atts[strtolower($m[5])] = stripcslashes($m[6]);
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elseif (isset($m[7]) and strlen($m[7]))
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$atts[] = stripcslashes($m[7]);
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elseif (isset($m[8]))
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$atts[] = stripcslashes($m[8]);
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}
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} else {
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$atts = ltrim($text);
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}
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return $atts;
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}
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function shortcode_atts($pairs, $atts) {
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$atts = (array)$atts;
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$out = array();
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foreach($pairs as $name => $default) {
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if ( array_key_exists($name, $atts) )
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$out[$name] = $atts[$name];
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else
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$out[$name] = $default;
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}
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return $out;
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}
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add_filter( 'the_content', 'do_shortcode', 9 );
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?>
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