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aaf99e6913
WordPress' code just... wasn't. This is now dealt with. Props jrf, pento, netweb, GaryJ, jdgrimes, westonruter, Greg Sherwood from PHPCS, and everyone who's ever contributed to WPCS and PHPCS. Fixes #41057. Built from https://develop.svn.wordpress.org/trunk@42343 git-svn-id: http://core.svn.wordpress.org/trunk@42172 1a063a9b-81f0-0310-95a4-ce76da25c4cd
649 lines
20 KiB
PHP
649 lines
20 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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* 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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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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* 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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* 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 $shortcode_tags;
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$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() . '/', $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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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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}
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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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* 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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* Passing a truthy value to the filter will effectively 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 bool|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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// 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 ) . $back;
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// Now encode any remaining [ or ] chars.
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$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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'[' => '[',
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']' => ']',
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);
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$content = strtr( $content, $trans );
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return $content;
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}
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/**
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* Retrieve the shortcode attributes regex.
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*
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* @since 4.4.0
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*
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* @return string The shortcode attribute regular expression
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*/
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function get_shortcode_atts_regex() {
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return '/([\w-]+)\s*=\s*"([^"]*)"(?:\s|$)|([\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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* 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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// 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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/**
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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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*
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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 $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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}
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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 );
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/**
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* Filters the list of shortcode tags to remove from the content.
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*
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* @since 4.7.0
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*
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* @param array $tag_array Array of shortcode tags to remove.
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* @param string $content Content shortcodes are being removed from.
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*/
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$tags_to_remove = apply_filters( 'strip_shortcodes_tagnames', $tags_to_remove, $content );
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$tagnames = array_intersect( $tags_to_remove, $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, true, $tagnames );
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$pattern = get_shortcode_regex( $tagnames );
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$content = preg_replace_callback( "/$pattern/", 'strip_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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|
* Strips a shortcode tag based on RegEx matches against post content.
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*
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|
* @since 3.3.0
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|
*
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* @param array $m RegEx matches against post content.
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* @return string|false The content stripped of the tag, otherwise false.
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*/
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function strip_shortcode_tag( $m ) {
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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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return $m[1] . $m[6];
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}
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