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<?php
/**
* Utility class for preserving shortcode content. This prevents filters
* like wptexturize and wpautop from affecting your content.
*/
class CS_Shortcode_Preserver {
/**
* I am a singleton
* @var object
*/
private static $instance;
/**
* By default we hook into the_content
* By specifying a hook, you can create a sandboxed equivilant of
* the_content with only WordPress native
* @var string
*/
private $hook;
/**
* List of shortcode tags.
* @var array
*/
private $shortcodes;
/**
* Internal cache of placeholders and content.
* @var array
*/
private $cache;
/**
* Setup shortcode preservation
* @param string $hook hook to use. Defaults to the_content
*/
public function __construct( $hook = '' ) {
$this->shortcodes = array();
$this->cache = array();
$this->attach_hooks( ( '' === $hook ) ? 'the_content' : $hook );
}
/**
* Attach preservation and restoration hooks to the filter being used
* for the_content. If we're using a custom hook, we'll load the sandbox filters.
* @param string $hook Custom hook for filtering
* @return none
*/
public function attach_hooks( $hook ) {
if ( 'the_content' !== $hook ) {
$this->sandbox_hooks( $hook );
}
add_filter( $hook, array( $this, 'preserve_shortcodes' ), 9 );
add_filter( $hook, array( $this, 'restore_shortcodes' ), 11 );
}
/**
* Wire-up WordPress native filters to a custom hook to emulate the_content
* as closely as possible.
* @param string $hook Custom hook for the_content emulation.
* @return none
*/
public function sandbox_hooks( $hook ) {
add_filter( $hook, array( $GLOBALS['wp_embed'], 'run_shortcode' ), 8 );
add_filter( $hook, array( $GLOBALS['wp_embed'], 'autoembed' ), 8 );
add_filter( $hook, 'capital_P_dangit', 11 );
add_filter( $hook, 'wptexturize' );
add_filter( $hook, 'convert_smilies' );
add_filter( $hook, 'wpautop' );
add_filter( $hook, 'shortcode_unautop' );
add_filter( $hook, 'prepend_attachment' );
if ( function_exists( 'wp_make_content_images_responsive' ) ) {
add_filter( $hook, 'wp_make_content_images_responsive' ); // Added in WP 4.4
}
add_filter( $hook, 'do_shortcode', 11 ); // AFTER wpautop()
}
/**
* Pre-filter the_content and replace our shortcodes with placeholders using
* a regex filter similar to the original WordPress shortcode replacements.
* @param string $content Original content, before WordPress filters applied.
* @return string Content with placeholders
*/
public function preserve_shortcodes( $content ) {
$this->shortcodes = apply_filters( 'cs_preserve_shortcodes', $this->shortcodes );
if ( empty( $this->shortcodes ) ) {
return $content;
}
global $shortcode_tags;
$original = $shortcode_tags;
remove_all_shortcodes();
foreach ( $this->shortcodes as $shortcode ) {
add_shortcode( $shortcode, '__return_empty_string' );
}
$pattern = get_shortcode_regex();
$content = preg_replace_callback( "/$pattern/s", array( $this, 'preserve_shortcode' ), $content );
$shortcode_tags = $original; // WPCS: override ok.
return $content;
}
/**
* Swap out placeholders for the original unscathed content.
* @param string $content Content after WordPress filters have been applied.
* @return string Final content
*/
public function restore_shortcodes( $content ) {
foreach ($this->cache as $key => $value) {
if ( apply_filters( 'cs_preserve_shortcodes_no_wrap', false ) ) {
$content = str_replace( '<p>' . $key . '</p>', $key, $content );
}
$content = str_replace( $key, $value, $content );
}
return do_shortcode( $content, true );
}
/**
* Callback for regex replacement. This caches the match, and returns a placeholder.
* @param array $matches Matches for an individual shortcode
* @return string A placeholder we can target later.
*/
public function preserve_shortcode( $matches ) {
$placeholder = '{{{'. uniqid() . '}}}';
$this->cache[ $placeholder ] = $matches[0];
return $placeholder;
}
/**
* Alias for ::instance
* For semantics. init can be called when the intention is the first initialization
* @return object CS_Shortcode_Preserver::$instance
*/
public static function init( $hook = '' ) {
if ( ! isset( self::$instance ) ) {
self::$instance = new CS_Shortcode_Preserver( $hook );
}
return self::$instance;
}
/**
* Create an isolated filter equivalent to the_content but with only WordPress
* native filters. This can help with custom formatting in areas sensitive to
* plugin conflicts.
* @param string $hook Name of filter to use
* @return none
*/
public static function sandbox( $hook = '' ) {
if ( 'the_content' !== $hook ) {
self::init()->attach_hooks( $hook );
}
}
/**
* Mark a shortcode for preservation. A more direct approach than using the filter.
* @param string $shortcode Tag of shortcode to preserve.
* @return none
*/
public static function preserve( $shortcode ) {
if ( ! isset( self::$instance ) || in_array( $shortcode, self::$instance->shortcodes, true ) ) {
return;
}
self::$instance->shortcodes[] = $shortcode;
}
}