X-Git-Url: https://scripts.mit.edu/gitweb/autoinstalls/wordpress.git/blobdiff_plain/76aea3697c6043c1613370f172395b4f65ee71f0..bf5c68485ef07868ad0a91168ecd0092af7661ae:/wp-includes/shortcodes.php

diff --git a/wp-includes/shortcodes.php b/wp-includes/shortcodes.php
index 2cc808ce..1cb36137 100644
--- a/wp-includes/shortcodes.php
+++ b/wp-includes/shortcodes.php
@@ -48,7 +48,7 @@ $shortcode_tags = array();
  * There can only be one hook for each shortcode. Which means that if another
  * plugin has a similar shortcode, it will override yours or yours will override
  * theirs depending on which order the plugins are included and/or ran.
- * 
+ *
  * Simplest example of a shortcode tag using the API:
  *
  * <code>
@@ -148,7 +148,7 @@ function do_shortcode($content) {
 		return $content;
 
 	$pattern = get_shortcode_regex();
-	return preg_replace_callback('/'.$pattern.'/s', 'do_shortcode_tag', $content);
+	return preg_replace_callback( "/$pattern/s", 'do_shortcode_tag', $content );
 }
 
 /**
@@ -157,6 +157,15 @@ function do_shortcode($content) {
  * The regular expression combines the shortcode tags in the regular expression
  * in a regex class.
  *
+ * The regular expression contains 6 different sub matches to help with parsing.
+ *
+ * 1 - An extra [ to allow for escaping shortcodes with double [[]]
+ * 2 - The shortcode name
+ * 3 - The shortcode argument list
+ * 4 - The self closing /
+ * 5 - The content of a shortcode when it wraps some content.
+ * 6 - An extra ] to allow for escaping shortcodes with double [[]]
+ *
  * @since 2.5
  * @uses $shortcode_tags
  *
@@ -167,11 +176,41 @@ function get_shortcode_regex() {
 	$tagnames = array_keys($shortcode_tags);
 	$tagregexp = join( '|', array_map('preg_quote', $tagnames) );
 
-	return '\[('.$tagregexp.')\b(.*?)(?:(\/))?\](?:(.+?)\[\/\1\])?';
+	// WARNING! Do not change this regex without changing do_shortcode_tag() and strip_shortcode_tag()
+	return
+		  '\\['                              // Opening bracket
+		. '(\\[?)'                           // 1: Optional second opening bracket for escaping shortcodes: [[tag]]
+		. "($tagregexp)"                     // 2: Shortcode name
+		. '\\b'                              // Word boundary
+		. '('                                // 3: Unroll the loop: Inside the opening shortcode tag
+		.     '[^\\]\\/]*'                   // Not a closing bracket or forward slash
+		.     '(?:'
+		.         '\\/(?!\\])'               // A forward slash not followed by a closing bracket
+		.         '[^\\]\\/]*'               // Not a closing bracket or forward slash
+		.     ')*?'
+		. ')'
+		. '(?:'
+		.     '(\\/)'                        // 4: Self closing tag ...
+		.     '\\]'                          // ... and closing bracket
+		. '|'
+		.     '\\]'                          // Closing bracket
+		.     '(?:'
+		.         '('                        // 5: Unroll the loop: Optionally, anything between the opening and closing shortcode tags
+		.             '[^\\[]*+'             // Not an opening bracket
+		.             '(?:'
+		.                 '\\[(?!\\/\\2\\])' // An opening bracket not followed by the closing shortcode tag
+		.                 '[^\\[]*+'         // Not an opening bracket
+		.             ')*+'
+		.         ')'
+		.         '\\[\\/\\2\\]'             // Closing shortcode tag
+		.     ')?'
+		. ')'
+		. '(\\]?)';                          // 6: Optional second closing brocket for escaping shortcodes: [[tag]]
 }
 
 /**
  * Regular Expression callable for do_shortcode() for calling shortcode hook.
+ * @see get_shortcode_regex for details of the match array contents.
  *
  * @since 2.5
  * @access private
@@ -180,18 +219,23 @@ function get_shortcode_regex() {
  * @param array $m Regular expression match array
  * @return mixed False on failure.
  */
-function do_shortcode_tag($m) {
+function do_shortcode_tag( $m ) {
 	global $shortcode_tags;
 
-	$tag = $m[1];
-	$attr = shortcode_parse_atts($m[2]);
+	// allow [[foo]] syntax for escaping a tag
+	if ( $m[1] == '[' && $m[6] == ']' ) {
+		return substr($m[0], 1, -1);
+	}
+
+	$tag = $m[2];
+	$attr = shortcode_parse_atts( $m[3] );
 
-	if ( isset($m[4]) ) {
+	if ( isset( $m[5] ) ) {
 		// enclosing tag - extra parameter
-		return call_user_func($shortcode_tags[$tag], $attr, $m[4]);
+		return $m[1] . call_user_func( $shortcode_tags[$tag], $attr, $m[5], $tag ) . $m[6];
 	} else {
 		// self-closing tag
-		return call_user_func($shortcode_tags[$tag], $attr);
+		return $m[1] . call_user_func( $shortcode_tags[$tag], $attr, NULL,  $tag ) . $m[6];
 	}
 }
 
@@ -204,7 +248,7 @@ function do_shortcode_tag($m) {
  *
  * @since 2.5
  *
- * @param string $text 
+ * @param string $text
  * @return array List of attributes and their value.
  */
 function shortcode_parse_atts($text) {
@@ -275,9 +319,18 @@ function strip_shortcodes( $content ) {
 
 	$pattern = get_shortcode_regex();
 
-	return preg_replace('/'.$pattern.'/s', '', $content);
+	return preg_replace_callback( "/$pattern/s", 'strip_shortcode_tag', $content );
+}
+
+function strip_shortcode_tag( $m ) {
+	// allow [[foo]] syntax for escaping a tag
+	if ( $m[1] == '[' && $m[6] == ']' ) {
+		return substr($m[0], 1, -1);
+	}
+
+	return $m[1] . $m[6];
 }
 
-add_filter('the_content', 'do_shortcode', 11); // AFTER wpautop() 
+add_filter('the_content', 'do_shortcode', 11); // AFTER wpautop()
 
-?>
\ No newline at end of file
+?>