Merge branch 'html-api/add-spawn-fragment-parser-method' into html-api/js-add-set-inner-html

Author: sirreal

src/wp-includes/html-api/class-wp-html-processor.php

@@ -517,6 +517,61 @@ function ( WP_HTML_Token $token ): void {
 		};
 	}
 
+	/**
+	 * Creates a fragment processor with the current node as its context element.
+	 *
+	 * @see https://html.spec.whatwg.org/multipage/parsing.html#html-fragment-parsing-algorithm
+	 *
+	 * @param string $html     Input HTML fragment to process.
+	 * @return static|null     The created processor if successful, otherwise null.
+	 */
+	public function spawn_fragment_parser( string $html ): ?self {
+		if ( $this->get_token_type() !== '#tag' ) {
+			return null;
+		}
+
+		$namespace = $this->get_namespace();
+
+		/*
+		 * Prevent creating fragments at "self-contained" nodes.
+		 *
+		 * @see https://github.com/WordPress/wordpress-develop/pull/7141
+		 * @see https://github.com/WordPress/wordpress-develop/pull/7198
+		 */
+		if (
+			'html' === $namespace &&
+			in_array( $this->get_tag(), array( 'IFRAME', 'NOEMBED', 'NOFRAMES', 'SCRIPT', 'STYLE', 'TEXTAREA', 'TITLE', 'XMP' ), true )
+		) {
+			return null;
+		}
+
+		$fragment_processor              = self::create_fragment( $html );
+		$fragment_processor->compat_mode = $this->compat_mode;
+
+		$fragment_processor->context_node                = clone $this->state->current_token;
+		$fragment_processor->context_node->bookmark_name = 'context-node';
+		$fragment_processor->context_node->on_destroy    = null;
+
+		$context_element = array( $fragment_processor->context_node->node_name, array() );
+		foreach ( $this->get_attribute_names_with_prefix( '' ) as $name => $value ) {
+			$context_element[1][ $name ] = $value;
+		}
+
+		$fragment_processor->breadcrumbs = array();
+
+		if ( 'TEMPLATE' === $context_element[0] ) {
+			$fragment_processor->state->stack_of_template_insertion_modes[] = WP_HTML_Processor_State::INSERTION_MODE_IN_TEMPLATE;
+		}
+
+		$fragment_processor->reset_insertion_mode_appropriately();
+
+		// @todo Set the parser's form element pointer.
+
+		$fragment_processor->state->encoding_confidence = 'irrelevant';
+
+		return $fragment_processor;
+	}
+
 	/**
 	 * Stops the parser and terminates its execution when encountering unsupported markup.
 	 *

tests/phpunit/tests/html-api/wpHtmlProcessorHtml5lib.php

@@ -138,10 +138,6 @@ public function data_external_html5lib_tests() {
 	 * @return bool True if the test case should be skipped. False otherwise.
 	 */
 	private static function should_skip_test( ?string $test_context_element, string $test_name ): bool {
-		if ( null !== $test_context_element && 'body' !== $test_context_element ) {
-			return true;
-		}
-
 		if ( array_key_exists( $test_name, self::SKIP_TESTS ) ) {
 			return true;
 		}
@@ -157,11 +153,77 @@ private static function should_skip_test( ?string $test_context_element, string
 	 * @return string|null Tree structure of parsed HTML, if supported, else null.
 	 */
 	private static function build_tree_representation( ?string $fragment_context, string $html ) {
-		$processor = $fragment_context
-			? WP_HTML_Processor::create_fragment( $html, "<{$fragment_context}>" )
-			: WP_HTML_Processor::create_full_parser( $html );
-		if ( null === $processor ) {
-			throw new WP_HTML_Unsupported_Exception( "Could not create a parser with the given fragment context: {$fragment_context}.", '', 0, '', array(), array() );
+		$processor = null;
+		if ( $fragment_context ) {
+			if ( 'body' === $fragment_context ) {
+				$processor = WP_HTML_Processor::create_fragment( $html );
+			} else {
+
+				/*
+				 * If the string of characters starts with "svg ", the context
+				 * element is in the SVG namespace and the substring after
+				 * "svg " is the local name. If the string of characters starts
+				 * with "math ", the context element is in the MathML namespace
+				 * and the substring after "math " is the local name.
+				 * Otherwise, the context element is in the HTML namespace and
+				 * the string is the local name.
+				 */
+				if ( str_starts_with( $fragment_context, 'svg ' ) ) {
+					$tag_name = substr( $fragment_context, 4 );
+					if ( 'svg' === $tag_name ) {
+						$parent_processor = WP_HTML_Processor::create_full_parser( '<!DOCTYPE html><svg>' );
+					} else {
+						$parent_processor = WP_HTML_Processor::create_full_parser( "<!DOCTYPE html><svg><{$tag_name}>" );
+					}
+					$parent_processor->next_tag( $tag_name );
+				} elseif ( str_starts_with( $fragment_context, 'math ' ) ) {
+					$tag_name = substr( $fragment_context, 5 );
+					if ( 'math' === $tag_name ) {
+						$parent_processor = WP_HTML_Processor::create_full_parser( '<!DOCTYPE html><math>' );
+					} else {
+						$parent_processor = WP_HTML_Processor::create_full_parser( "<!DOCTYPE html><math><{$tag_name}>" );
+					}
+					$parent_processor->next_tag( $tag_name );
+				} else {
+					if ( in_array(
+						$fragment_context,
+						array(
+							'caption',
+							'col',
+							'colgroup',
+							'tbody',
+							'td',
+							'tfoot',
+							'th',
+							'thead',
+							'tr',
+						),
+						true
+					) ) {
+						$parent_processor = WP_HTML_Processor::create_full_parser( "<!DOCTYPE html><table><{$fragment_context}>" );
+						$parent_processor->next_tag();
+					} else {
+						$parent_processor = WP_HTML_Processor::create_full_parser( "<!DOCTYPE html><{$fragment_context}>" );
+					}
+					$parent_processor->next_tag( $fragment_context );
+				}
+				if ( null !== $parent_processor->get_unsupported_exception() ) {
+					throw $parent_processor->get_unsupported_exception();
+				}
+				if ( null !== $parent_processor->get_last_error() ) {
+					throw new Exception( $parent_processor->get_last_error() );
+				}
+				$processor = $parent_processor->spawn_fragment_parser( $html );
+			}
+
+			if ( null === $processor ) {
+				throw new WP_HTML_Unsupported_Exception( "Could not create a parser with the given fragment context: {$fragment_context}.", '', 0, '', array(), array() );
+			}
+		} else {
+			$processor = WP_HTML_Processor::create_full_parser( $html );
+			if ( null === $processor ) {
+				throw new Exception( 'Could not create a full parser.' );
+			}
 		}
 
 		/*