+ if ( $ignore_html || '<!--' === substr( $element, 0, 4 ) || '<![CDATA[' === substr( $element, 0, 9 ) ) {
+ // Encode all [ and ] chars.
+ $element = strtr( $element, $trans );
+ continue;
+ }
+
+ $attributes = wp_kses_attr_parse( $element );
+ if ( false === $attributes ) {
+ // Some plugins are doing things like [name] <[email]>.
+ if ( 1 === preg_match( '%^<\s*\[\[?[^\[\]]+\]%', $element ) ) {
+ $element = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $element );
+ }
+
+ // Looks like we found some crazy unfiltered HTML. Skipping it for sanity.
+ $element = strtr( $element, $trans );
+ continue;
+ }
+
+ // Get element name
+ $front = array_shift( $attributes );
+ $back = array_pop( $attributes );
+ $matches = array();
+ preg_match('%[a-zA-Z0-9]+%', $front, $matches);
+ $elname = $matches[0];
+
+ // Look for shortcodes in each attribute separately.
+ foreach ( $attributes as &$attr ) {
+ $open = strpos( $attr, '[' );
+ $close = strpos( $attr, ']' );
+ if ( false === $open || false === $close ) {
+ continue; // Go to next attribute. Square braces will be escaped at end of loop.
+ }
+ $double = strpos( $attr, '"' );
+ $single = strpos( $attr, "'" );
+ if ( ( false === $single || $open < $single ) && ( false === $double || $open < $double ) ) {
+ // $attr like '[shortcode]' or 'name = [shortcode]' implies unfiltered_html.
+ // In this specific situation we assume KSES did not run because the input
+ // was written by an administrator, so we should avoid changing the output
+ // and we do not need to run KSES here.
+ $attr = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $attr );
+ } else {
+ // $attr like 'name = "[shortcode]"' or "name = '[shortcode]'"
+ // We do not know if $content was unfiltered. Assume KSES ran before shortcodes.
+ $count = 0;
+ $new_attr = preg_replace_callback( "/$pattern/", 'do_shortcode_tag', $attr, -1, $count );
+ if ( $count > 0 ) {
+ // Sanitize the shortcode output using KSES.
+ $new_attr = wp_kses_one_attr( $new_attr, $elname );
+ if ( '' !== trim( $new_attr ) ) {
+ // The shortcode is safe to use now.
+ $attr = $new_attr;
+ }
+ }
+ }
+ }
+ $element = $front . implode( '', $attributes ) . $back;
+
+ // Now encode any remaining [ or ] chars.
+ $element = strtr( $element, $trans );