558 lines
17 KiB
PHP
558 lines
17 KiB
PHP
<?php
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/**
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* WordPress API for creating bbcode like tags or what WordPress calls
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* "shortcodes." The tag and attribute parsing or regular expression code is
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* based on the Textpattern tag parser.
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*
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* A few examples are below:
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*
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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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*
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* Shortcode tags support attributes and enclosed content, but does not entirely
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* support inline shortcodes in other shortcodes. You will have to call the
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* shortcode parser in your function to account for that.
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*
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* {@internal
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* Please be aware that the above note was made during the beta of WordPress 2.6
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* and in the future may not be accurate. Please update the note when it is no
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* longer the case.}}
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*
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* To apply shortcode tags to content:
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*
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* $out = do_shortcode( $content );
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*
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* @link https://codex.wordpress.org/Shortcode_API
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*
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* @package WordPress
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* @subpackage Shortcodes
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* @since 2.5.0
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*/
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/**
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* Container for storing shortcode tags and their hook to call for the shortcode
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*
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* @since 2.5.0
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*
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* @name $shortcode_tags
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* @var array
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* @global array $shortcode_tags
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*/
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$shortcode_tags = array();
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/**
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* Add hook for shortcode tag.
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*
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* There can only be one hook for each shortcode. Which means that if another
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* plugin has a similar shortcode, it will override yours or yours will override
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* theirs depending on which order the plugins are included and/or ran.
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*
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* Simplest example of a shortcode tag using the API:
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*
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* // [footag foo="bar"]
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* function footag_func( $atts ) {
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* return "foo = {
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* $atts[foo]
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* }";
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* }
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* add_shortcode( 'footag', 'footag_func' );
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*
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* Example with nice attribute defaults:
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*
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* // [bartag foo="bar"]
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* function bartag_func( $atts ) {
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* $args = shortcode_atts( array(
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* 'foo' => 'no foo',
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* 'baz' => 'default baz',
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* ), $atts );
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*
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* return "foo = {$args['foo']}";
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* }
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* add_shortcode( 'bartag', 'bartag_func' );
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*
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* Example with enclosed content:
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*
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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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* @since 2.5.0
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*
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* @uses $shortcode_tags
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*
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* @param string $tag Shortcode tag to be searched in post content.
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* @param callable $func Hook to run when shortcode is found.
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*/
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function add_shortcode($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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/**
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* Removes hook for shortcode.
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*
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* @since 2.5.0
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*
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* @uses $shortcode_tags
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*
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* @param string $tag Shortcode tag to remove hook for.
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*/
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function remove_shortcode($tag) {
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global $shortcode_tags;
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unset($shortcode_tags[$tag]);
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}
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/**
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* Clear all shortcodes.
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*
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* This function is simple, it clears all of the shortcode tags by replacing the
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* shortcodes global by a empty array. This is actually a very efficient method
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* for removing all shortcodes.
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*
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* @since 2.5.0
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*
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* @uses $shortcode_tags
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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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/**
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* Whether a registered shortcode exists named $tag
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*
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* @since 3.6.0
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*
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* @global array $shortcode_tags List of shortcode tags and their callback hooks.
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*
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* @param string $tag Shortcode tag to check.
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* @return bool Whether the given shortcode exists.
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*/
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function shortcode_exists( $tag ) {
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global $shortcode_tags;
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return array_key_exists( $tag, $shortcode_tags );
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}
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/**
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* Whether the passed content contains the specified shortcode
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*
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* @since 3.6.0
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*
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* @global array $shortcode_tags
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*
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* @param string $content Content to search for shortcodes.
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* @param string $tag Shortcode tag to check.
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* @return bool Whether the passed content contains the given shortcode.
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*/
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function has_shortcode( $content, $tag ) {
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if ( false === strpos( $content, '[' ) ) {
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return false;
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}
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if ( shortcode_exists( $tag ) ) {
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preg_match_all( '/' . get_shortcode_regex() . '/s', $content, $matches, PREG_SET_ORDER );
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if ( empty( $matches ) )
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return false;
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foreach ( $matches as $shortcode ) {
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if ( $tag === $shortcode[2] ) {
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return true;
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} elseif ( ! empty( $shortcode[5] ) && has_shortcode( $shortcode[5], $tag ) ) {
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return true;
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}
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}
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}
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return false;
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}
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/**
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* Search content for shortcodes and filter shortcodes through their hooks.
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*
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* If there are no shortcode tags defined, then the content will be returned
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* without any filtering. This might cause issues when plugins are disabled but
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* the shortcode will still show up in the post or content.
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*
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* @since 2.5.0
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*
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* @global array $shortcode_tags List of shortcode tags and their callback hooks.
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*
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* @param string $content Content to search for shortcodes.
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* @param bool $ignore_html When true, shortcodes inside HTML elements will be skipped.
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* @return string Content with shortcodes filtered out.
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*/
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function do_shortcode( $content, $ignore_html = false ) {
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global $shortcode_tags;
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if ( false === strpos( $content, '[' ) ) {
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return $content;
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}
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if (empty($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)/s";
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if ( 1 !== preg_match( $pattern, $content ) ) {
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// Avoids parsing HTML when there are no shortcodes or embeds anyway.
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return $content;
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}
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$content = do_shortcodes_in_html_tags( $content, $ignore_html );
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$pattern = get_shortcode_regex();
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$content = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $content );
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// Always restore square braces so we don't break things like <!--[if IE ]>
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$content = unescape_invalid_shortcodes( $content );
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return $content;
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}
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/**
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* Retrieve the shortcode regular expression for searching.
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*
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* The regular expression combines the shortcode tags in the regular expression
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* in a regex class.
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*
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* The regular expression contains 6 different sub matches to help with parsing.
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*
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* 1 - An extra [ to allow for escaping shortcodes with double [[]]
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* 2 - The shortcode name
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* 3 - The shortcode argument list
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* 4 - The self closing /
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* 5 - The content of a shortcode when it wraps some content.
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* 6 - An extra ] to allow for escaping shortcodes with double [[]]
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*
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* @since 2.5.0
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*
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* @uses $shortcode_tags
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*
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* @return string The shortcode search regular expression
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*/
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function get_shortcode_regex() {
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global $shortcode_tags;
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$tagnames = array_keys($shortcode_tags);
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$tagregexp = join( '|', array_map('preg_quote', $tagnames) );
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// WARNING! Do not change this regex without changing do_shortcode_tag() and strip_shortcode_tag()
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// Also, see shortcode_unautop() and shortcode.js.
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return
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'\\[' // Opening bracket
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. '(\\[?)' // 1: Optional second opening bracket for escaping shortcodes: [[tag]]
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. "($tagregexp)" // 2: Shortcode name
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. '(?![\\w-])' // Not followed by word character or hyphen
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. '(' // 3: Unroll the loop: Inside the opening shortcode tag
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. '[^\\]\\/]*' // Not a closing bracket or forward slash
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. '(?:'
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. '\\/(?!\\])' // A forward slash not followed by a closing bracket
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. '[^\\]\\/]*' // Not a closing bracket or forward slash
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. ')*?'
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. ')'
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. '(?:'
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. '(\\/)' // 4: Self closing tag ...
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. '\\]' // ... and closing bracket
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. '|'
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. '\\]' // Closing bracket
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. '(?:'
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. '(' // 5: Unroll the loop: Optionally, anything between the opening and closing shortcode tags
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. '[^\\[]*+' // Not an opening bracket
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. '(?:'
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. '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag
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. '[^\\[]*+' // Not an opening bracket
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. ')*+'
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. ')'
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. '\\[\\/\\2\\]' // Closing shortcode tag
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. ')?'
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. ')'
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. '(\\]?)'; // 6: Optional second closing brocket for escaping shortcodes: [[tag]]
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}
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/**
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* Regular Expression callable for do_shortcode() for calling shortcode hook.
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* @see get_shortcode_regex for details of the match array contents.
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*
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* @since 2.5.0
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* @access private
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* @uses $shortcode_tags
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*
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* @param array $m Regular expression match array
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* @return mixed False on failure.
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*/
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function do_shortcode_tag( $m ) {
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global $shortcode_tags;
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// allow [[foo]] syntax for escaping a tag
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if ( $m[1] == '[' && $m[6] == ']' ) {
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return substr($m[0], 1, -1);
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}
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$tag = $m[2];
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$attr = shortcode_parse_atts( $m[3] );
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if ( isset( $m[5] ) ) {
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// enclosing tag - extra parameter
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return $m[1] . call_user_func( $shortcode_tags[$tag], $attr, $m[5], $tag ) . $m[6];
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} else {
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// self-closing tag
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return $m[1] . call_user_func( $shortcode_tags[$tag], $attr, null, $tag ) . $m[6];
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}
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}
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/**
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* Search only inside HTML elements for shortcodes and process them.
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*
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* Any [ or ] characters remaining inside elements will be HTML encoded
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* to prevent interference with shortcodes that are outside the elements.
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* Assumes $content processed by KSES already. Users with unfiltered_html
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* capability may get unexpected output if angle braces are nested in tags.
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*
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* @since 4.2.3
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*
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* @param string $content Content to search for shortcodes
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* @param bool $ignore_html When true, all square braces inside elements will be encoded.
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* @return string Content with shortcodes filtered out.
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*/
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function do_shortcodes_in_html_tags( $content, $ignore_html ) {
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// Normalize entities in unfiltered HTML before adding placeholders.
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$trans = array( '[' => '[', ']' => ']' );
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$content = strtr( $content, $trans );
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$trans = array( '[' => '[', ']' => ']' );
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$pattern = get_shortcode_regex();
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$textarr = wp_html_split( $content );
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foreach ( $textarr as &$element ) {
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if ( '' == $element || '<' !== $element[0] ) {
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continue;
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}
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$noopen = false === strpos( $element, '[' );
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$noclose = false === strpos( $element, ']' );
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if ( $noopen || $noclose ) {
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// This element does not contain shortcodes.
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if ( $noopen xor $noclose ) {
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// Need to encode stray [ or ] chars.
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$element = strtr( $element, $trans );
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}
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continue;
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}
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if ( $ignore_html || '<!--' === substr( $element, 0, 4 ) || '<![CDATA[' === substr( $element, 0, 9 ) ) {
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// Encode all [ and ] chars.
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$element = strtr( $element, $trans );
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continue;
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}
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$attributes = wp_kses_attr_parse( $element );
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if ( false === $attributes ) {
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// Some plugins are doing things like [name] <[email]>.
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if ( 1 === preg_match( '%^<\s*\[\[?[^\[\]]+\]%', $element ) ) {
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$element = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $element );
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}
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// Looks like we found some crazy unfiltered HTML. Skipping it for sanity.
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$element = strtr( $element, $trans );
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continue;
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}
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// Get element name
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$front = array_shift( $attributes );
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$back = array_pop( $attributes );
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$matches = array();
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preg_match('%[a-zA-Z0-9]+%', $front, $matches);
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$elname = $matches[0];
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// Look for shortcodes in each attribute separately.
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foreach ( $attributes as &$attr ) {
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$open = strpos( $attr, '[' );
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$close = strpos( $attr, ']' );
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if ( false === $open || false === $close ) {
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continue; // Go to next attribute. Square braces will be escaped at end of loop.
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}
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$double = strpos( $attr, '"' );
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$single = strpos( $attr, "'" );
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if ( ( false === $single || $open < $single ) && ( false === $double || $open < $double ) ) {
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// $attr like '[shortcode]' or 'name = [shortcode]' implies unfiltered_html.
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// In this specific situation we assume KSES did not run because the input
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// was written by an administrator, so we should avoid changing the output
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// and we do not need to run KSES here.
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$attr = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $attr );
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} else {
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// $attr like 'name = "[shortcode]"' or "name = '[shortcode]'"
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// We do not know if $content was unfiltered. Assume KSES ran before shortcodes.
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$count = 0;
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$new_attr = preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $attr, -1, $count );
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if ( $count > 0 ) {
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// Sanitize the shortcode output using KSES.
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$new_attr = wp_kses_one_attr( $new_attr, $elname );
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if ( '' !== $new_attr ) {
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// The shortcode is safe to use now.
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$attr = $new_attr;
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}
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}
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}
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}
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$element = $front . implode( '', $attributes ) . $back;
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// Now encode any remaining [ or ] chars.
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$element = strtr( $element, $trans );
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}
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$content = implode( '', $textarr );
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return $content;
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}
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/**
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* Remove placeholders added by do_shortcodes_in_html_tags().
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*
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* @since 4.2.3
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*
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* @param string $content Content to search for placeholders.
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* @return string Content with placeholders removed.
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*/
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function unescape_invalid_shortcodes( $content ) {
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// Clean up entire string, avoids re-parsing HTML.
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$trans = array( '[' => '[', ']' => ']' );
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$content = strtr( $content, $trans );
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return $content;
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}
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/**
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* Retrieve all attributes from the shortcodes tag.
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*
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* The attributes list has the attribute name as the key and the value of the
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* attribute as the value in the key/value pair. This allows for easier
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* retrieval of the attributes, since all attributes have to be known.
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*
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* @since 2.5.0
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*
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* @param string $text
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* @return array List of attributes and their value.
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*/
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function shortcode_parse_atts($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|$)/';
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$text = preg_replace("/[\x{00a0}\x{200b}]+/u", " ", $text);
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if ( preg_match_all($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]) && 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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// Reject any unclosed HTML elements
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foreach( $atts as &$value ) {
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if ( false !== strpos( $value, '<' ) ) {
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if ( 1 !== preg_match( '/^[^<]*+(?:<[^>]*+>[^<]*+)*+$/', $value ) ) {
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$value = '';
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}
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}
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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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/**
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* Combine user attributes with known attributes and fill in defaults when needed.
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*
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* The pairs should be considered to be all of the attributes which are
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* supported by the caller and given as a list. The returned attributes will
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* only contain the attributes in the $pairs list.
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*
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* If the $atts list has unsupported attributes, then they will be ignored and
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* removed from the final returned list.
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*
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* @since 2.5.0
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*
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* @param array $pairs Entire list of supported attributes and their defaults.
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* @param array $atts User defined attributes in shortcode tag.
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* @param string $shortcode Optional. The name of the shortcode, provided for context to enable filtering
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* @return array Combined and filtered attribute list.
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*/
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function shortcode_atts( $pairs, $atts, $shortcode = '' ) {
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$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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/**
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* Filter a shortcode's default attributes.
|
|
*
|
|
* If the third parameter of the shortcode_atts() function is present then this filter is available.
|
|
* The third parameter, $shortcode, is the name of the shortcode.
|
|
*
|
|
* @since 3.6.0
|
|
*
|
|
* @param array $out The output array of shortcode attributes.
|
|
* @param array $pairs The supported attributes and their defaults.
|
|
* @param array $atts The user defined shortcode attributes.
|
|
*/
|
|
if ( $shortcode )
|
|
$out = apply_filters( "shortcode_atts_{$shortcode}", $out, $pairs, $atts );
|
|
|
|
return $out;
|
|
}
|
|
|
|
/**
|
|
* Remove all shortcode tags from the given content.
|
|
*
|
|
* @since 2.5.0
|
|
*
|
|
* @uses $shortcode_tags
|
|
*
|
|
* @param string $content Content to remove shortcode tags.
|
|
* @return string Content without shortcode tags.
|
|
*/
|
|
function strip_shortcodes( $content ) {
|
|
global $shortcode_tags;
|
|
|
|
if ( false === strpos( $content, '[' ) ) {
|
|
return $content;
|
|
}
|
|
|
|
if (empty($shortcode_tags) || !is_array($shortcode_tags))
|
|
return $content;
|
|
|
|
$content = do_shortcodes_in_html_tags( $content, true );
|
|
|
|
$pattern = get_shortcode_regex();
|
|
$content = preg_replace_callback( "/$pattern/s", 'strip_shortcode_tag', $content );
|
|
|
|
// Always restore square braces so we don't break things like <!--[if IE ]>
|
|
$content = unescape_invalid_shortcodes( $content );
|
|
|
|
return $content;
|
|
}
|
|
|
|
function strip_shortcode_tag( $m ) {
|
|
// allow [[foo]] syntax for escaping a tag
|
|
if ( $m[1] == '[' && $m[6] == ']' ) {
|
|
return substr($m[0], 1, -1);
|
|
}
|
|
|
|
return $m[1] . $m[6];
|
|
}
|