Add WP_Block_Bindings_Processor class

src/wp-includes/class-wp-block-bindings-processor.php

@@ -0,0 +1,34 @@
+<?php
+
+class WP_Block_Bindings_Processor extends WP_HTML_Processor {
+	private $output         = '';
+	private $end_of_flushed = 0;
+
+	public function build() {
+		return $this->output . substr( $this->html, $this->end_of_flushed );
+	}
+
+	public function replace_rich_text( $rich_text ) {
+		if ( $this->is_tag_closer() ) {
+			return false;
+		}
+
+		$tag_name = $this->get_tag();
+		$depth    = $this->get_current_depth();
+
+		$this->set_bookmark( '_wp_block_bindings_tag_opener' );
+		// The bookmark names are prefixed with `_` so the key below has an extra `_`.
+		$bm            = $this->bookmarks['__wp_block_bindings_tag_opener'];
+		$this->output .= substr( $this->html, $this->end_of_flushed, $bm->start + $bm->length );
+		$this->output .= $rich_text;
+		$this->release_bookmark( '_wp_block_bindings_tag_opener' );
+
+		while ( $this->next_token() && $this->get_current_depth() >= $depth ) {
+		}
+
+		$this->set_bookmark( '_wp_block_bindings_tag_closer' );
+		$bm                   = $this->bookmarks['__wp_block_bindings_tag_closer'];
+		$this->end_of_flushed = $bm->start;
+		$this->release_bookmark( '_wp_block_bindings_tag_closer' );
+	}
+}

src/wp-settings.php

@@ -346,6 +346,7 @@
 require ABSPATH . WPINC . '/sitemaps/providers/class-wp-sitemaps-posts.php';
 require ABSPATH . WPINC . '/sitemaps/providers/class-wp-sitemaps-taxonomies.php';
 require ABSPATH . WPINC . '/sitemaps/providers/class-wp-sitemaps-users.php';
+require ABSPATH . WPINC . '/class-wp-block-bindings-processor.php';
 require ABSPATH . WPINC . '/class-wp-block-bindings-source.php';
 require ABSPATH . WPINC . '/class-wp-block-bindings-registry.php';
 require ABSPATH . WPINC . '/class-wp-block-editor-context.php';