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650 lines
20 KiB
650 lines
20 KiB
<?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://developer.wordpress.org/plugins/shortcodes/ |
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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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/** |
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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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/** |
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* Adds a new shortcode. |
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* |
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* Care should be taken through prefixing or other means to ensure that the |
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* shortcode tag being added is unique and will not conflict with other, |
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* already-added shortcode tags. In the event of a duplicated tag, the tag |
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* loaded last will take precedence. |
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* |
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* @since 2.5.0 |
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* |
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* @global array $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 $callback The callback function to run when the shortcode is found. |
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* Every shortcode callback is passed three parameters by default, |
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* including an array of attributes (`$atts`), the shortcode content |
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* or null if not set (`$content`), and finally the shortcode tag |
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* itself (`$shortcode_tag`), in that order. |
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*/ |
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function add_shortcode( $tag, $callback ) { |
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global $shortcode_tags; |
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|
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if ( '' == trim( $tag ) ) { |
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$message = __( 'Invalid shortcode name: Empty name given.' ); |
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_doing_it_wrong( __FUNCTION__, $message, '4.4.0' ); |
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return; |
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} |
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if ( 0 !== preg_match( '@[<>&/\[\]\x00-\x20=]@', $tag ) ) { |
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/* translators: 1: Shortcode name, 2: Space-separated list of reserved characters. */ |
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$message = sprintf( __( 'Invalid shortcode name: %1$s. Do not use spaces or reserved characters: %2$s' ), $tag, '& / < > [ ] =' ); |
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_doing_it_wrong( __FUNCTION__, $message, '4.4.0' ); |
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return; |
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} |
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$shortcode_tags[ $tag ] = $callback; |
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} |
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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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* @global array $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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/** |
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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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* @global array $shortcode_tags |
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*/ |
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function remove_all_shortcodes() { |
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global $shortcode_tags; |
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|
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$shortcode_tags = array(); |
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} |
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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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/** |
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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() . '/', $content, $matches, PREG_SET_ORDER ); |
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if ( empty( $matches ) ) { |
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return false; |
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} |
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|
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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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/** |
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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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} |
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// Find all registered tag names in $content. |
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preg_match_all( '@\[([^<>&/\[\]\x00-\x20=]++)@', $content, $matches ); |
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$tagnames = array_intersect( array_keys( $shortcode_tags ), $matches[1] ); |
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if ( empty( $tagnames ) ) { |
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return $content; |
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} |
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$content = do_shortcodes_in_html_tags( $content, $ignore_html, $tagnames ); |
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$pattern = get_shortcode_regex( $tagnames ); |
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$content = preg_replace_callback( "/$pattern/", '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 $content; |
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} |
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/** |
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* Retrieve the shortcode regular expression for searching. |
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* |
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* The regular expression combines the shortcode tags in the regular expression |
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* in a regex class. |
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* |
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* The regular expression contains 6 different sub matches to help with parsing. |
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* |
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* 1 - An extra [ to allow for escaping shortcodes with double [[]] |
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* 2 - The shortcode name |
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* 3 - The shortcode argument list |
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* 4 - The self closing / |
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* 5 - The content of a shortcode when it wraps some content. |
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* 6 - An extra ] to allow for escaping shortcodes with double [[]] |
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* |
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* @since 2.5.0 |
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* @since 4.4.0 Added the `$tagnames` parameter. |
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* |
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* @global array $shortcode_tags |
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* |
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* @param array $tagnames Optional. List of shortcodes to find. Defaults to all registered shortcodes. |
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* @return string The shortcode search regular expression |
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*/ |
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function get_shortcode_regex( $tagnames = null ) { |
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global $shortcode_tags; |
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if ( empty( $tagnames ) ) { |
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$tagnames = array_keys( $shortcode_tags ); |
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} |
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$tagregexp = join( '|', array_map( 'preg_quote', $tagnames ) ); |
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// WARNING! Do not change this regex without changing do_shortcode_tag() and strip_shortcode_tag() |
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// Also, see shortcode_unautop() and shortcode.js. |
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// phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation |
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return |
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'\\[' // Opening bracket |
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. '(\\[?)' // 1: Optional second opening bracket for escaping shortcodes: [[tag]] |
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. "($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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// phpcs:enable |
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} |
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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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* |
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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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* |
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* @global array $shortcode_tags |
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* |
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* @param array $m Regular expression match array |
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* @return string|false 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 ( ! is_callable( $shortcode_tags[ $tag ] ) ) { |
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/* translators: %s: Shortcode tag. */ |
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$message = sprintf( __( 'Attempting to parse a shortcode without a valid callback: %s' ), $tag ); |
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_doing_it_wrong( __FUNCTION__, $message, '4.3.0' ); |
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return $m[0]; |
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} |
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/** |
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* Filters whether to call a shortcode callback. |
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* |
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* Returning a non-false value from filter will short-circuit the |
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* shortcode generation process, returning that value instead. |
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* |
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* @since 4.7.0 |
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* |
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* @param false|string $return Short-circuit return value. Either false or the value to replace the shortcode with. |
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* @param string $tag Shortcode name. |
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* @param array|string $attr Shortcode attributes array or empty string. |
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* @param array $m Regular expression match array. |
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*/ |
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$return = apply_filters( 'pre_do_shortcode_tag', false, $tag, $attr, $m ); |
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if ( false !== $return ) { |
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return $return; |
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} |
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$content = isset( $m[5] ) ? $m[5] : null; |
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$output = $m[1] . call_user_func( $shortcode_tags[ $tag ], $attr, $content, $tag ) . $m[6]; |
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/** |
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* Filters the output created by a shortcode callback. |
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* |
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* @since 4.7.0 |
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* |
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* @param string $output Shortcode output. |
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* @param string $tag Shortcode name. |
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* @param array|string $attr Shortcode attributes array or empty string. |
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* @param array $m Regular expression match array. |
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*/ |
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return apply_filters( 'do_shortcode_tag', $output, $tag, $attr, $m ); |
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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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* @param array $tagnames List of shortcodes to find. |
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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, $tagnames ) { |
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// Normalize entities in unfiltered HTML before adding placeholders. |
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$trans = array( |
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'[' => '[', |
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']' => ']', |
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); |
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$content = strtr( $content, $trans ); |
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$trans = array( |
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'[' => '[', |
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']' => ']', |
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); |
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$pattern = get_shortcode_regex( $tagnames ); |
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$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/", '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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|
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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/", '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/", '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 ( '' !== trim( $new_attr ) ) { |
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// The shortcode is safe to use now. |
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$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 ) . $back; |
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|
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// Now encode any remaining [ or ] chars. |
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$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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/** |
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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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'[' => '[', |
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']' => ']', |
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); |
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$content = strtr( $content, $trans ); |
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|
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return $content; |
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} |
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|
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/** |
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* Retrieve the shortcode attributes regex. |
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* |
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* @since 4.4.0 |
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* |
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* @return string The shortcode attribute regular expression |
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*/ |
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function get_shortcode_atts_regex() { |
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return '/([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\w-]+)\s*=\s*\'([^\']*)\'(?:\s|$)|([\w-]+)\s*=\s*([^\s\'"]+)(?:\s|$)|"([^"]*)"(?:\s|$)|\'([^\']*)\'(?:\s|$)|(\S+)(?:\s|$)/'; |
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} |
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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|string List of attribute values. |
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* Returns empty array if trim( $text ) == '""'. |
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* Returns empty string if trim( $text ) == ''. |
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* All other matches are checked for not empty(). |
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*/ |
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function shortcode_parse_atts( $text ) { |
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$atts = array(); |
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$pattern = get_shortcode_atts_regex(); |
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$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] ) && strlen( $m[8] ) ) { |
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$atts[] = stripcslashes( $m[8] ); |
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} elseif ( isset( $m[9] ) ) { |
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$atts[] = stripcslashes( $m[9] ); |
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} |
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} |
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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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|
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return $atts; |
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} |
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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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/** |
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* Filters a shortcode's default attributes. |
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* |
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* If the third parameter of the shortcode_atts() function is present then this filter is available. |
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* The third parameter, $shortcode, is the name of the shortcode. |
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* |
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* @since 3.6.0 |
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* @since 4.4.0 Added the `$shortcode` parameter. |
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* |
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* @param array $out The output array of shortcode attributes. |
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* @param array $pairs The supported attributes and their defaults. |
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* @param array $atts The user defined shortcode attributes. |
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* @param string $shortcode The shortcode name. |
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*/ |
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if ( $shortcode ) { |
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$out = apply_filters( "shortcode_atts_{$shortcode}", $out, $pairs, $atts, $shortcode ); |
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} |
|
|
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return $out; |
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} |
|
|
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/** |
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* Remove all shortcode tags from the given content. |
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* |
|
* @since 2.5.0 |
|
* |
|
* @global array $shortcode_tags |
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* |
|
* @param string $content Content to remove shortcode tags. |
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* @return string Content without shortcode tags. |
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*/ |
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function strip_shortcodes( $content ) { |
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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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} |
|
|
|
// Find all registered tag names in $content. |
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preg_match_all( '@\[([^<>&/\[\]\x00-\x20=]++)@', $content, $matches ); |
|
|
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$tags_to_remove = array_keys( $shortcode_tags ); |
|
|
|
/** |
|
* Filters the list of shortcode tags to remove from the content. |
|
* |
|
* @since 4.7.0 |
|
* |
|
* @param array $tags_to_remove Array of shortcode tags to remove. |
|
* @param string $content Content shortcodes are being removed from. |
|
*/ |
|
$tags_to_remove = apply_filters( 'strip_shortcodes_tagnames', $tags_to_remove, $content ); |
|
|
|
$tagnames = array_intersect( $tags_to_remove, $matches[1] ); |
|
|
|
if ( empty( $tagnames ) ) { |
|
return $content; |
|
} |
|
|
|
$content = do_shortcodes_in_html_tags( $content, true, $tagnames ); |
|
|
|
$pattern = get_shortcode_regex( $tagnames ); |
|
$content = preg_replace_callback( "/$pattern/", 'strip_shortcode_tag', $content ); |
|
|
|
// Always restore square braces so we don't break things like <!--[if IE ]> |
|
$content = unescape_invalid_shortcodes( $content ); |
|
|
|
return $content; |
|
} |
|
|
|
/** |
|
* Strips a shortcode tag based on RegEx matches against post content. |
|
* |
|
* @since 3.3.0 |
|
* |
|
* @param array $m RegEx matches against post content. |
|
* @return string|false The content stripped of the tag, otherwise false. |
|
*/ |
|
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]; |
|
}
|
|
|