|| self::COMPLETE === $this->state || self::INCOMPLETE_INPUT === $this->state ) {
			return false;
		}

		// Void tokens automatically pop off the stack of open blocks.
		if ( $this->was_void ) {
			array_pop( $this->open_blocks_at );
			array_pop( $this->open_blocks_length );
			$this->was_void = false;
		}

		$text = $this->source_text;
		$end  = strlen( $text );

		/*
		 * Because HTML spans are inferred after finding the next delimiter, it means that
		 * the parser must transition out of that HTML state and reuse the token boundaries
		 * it found after the HTML span. If those boundaries are before the end of the
		 * document it implies that a real delimiter was found; otherwise this must be the
		 * terminating HTML span and the parsing is complete.
		 */
		if ( self::HTML_SPAN === $this->state ) {
			if ( $this->matched_delimiter_at >= $end ) {
				$this->state = self::COMPLETE;
				return false;
			}

			switch ( $this->next_stack_op ) {
				case 'void':
					$this->was_void             = true;
					$this->open_blocks_at[]     = $this->namespace_at;
					$this->open_blocks_length[] = $this->name_at + $this->name_length - $this->namespace_at;
					break;

				case 'push':
					$this->open_blocks_at[]     = $this->namespace_at;
					$this->open_blocks_length[] = $this->name_at + $this->name_length - $this->namespace_at;
					break;

				case 'pop':
					array_pop( $this->open_blocks_at );
					array_pop( $this->open_blocks_length );
					break;
			}

			$this->next_stack_op = null;
			$this->state         = self::MATCHED;
			return true;
		}

		$this->state          = self::READY;
		$after_prev_delimiter = $this->matched_delimiter_at + $this->matched_delimiter_length;
		$at                   = $after_prev_delimiter;

		while ( $at < $end ) {
			/*
			 * Find the next possible start of a delimiter.
			 *
			 * This follows the behavior in the official block parser, which segments a post
			 * by the block comment delimiters. It is possible for an HTML attribute to contain
			 * what looks like a block comment delimiter but which is actually an HTML attribute
			 * value. In such a case, the parser here will break apart the HTML and create the
			 * block boundary inside the HTML attribute. In other words, the block parser
			 * isolates sections of HTML from each other, even if that leads to malformed markup.
			 *
			 * For a more robust parse, scan through the document with the HTML API and parse
			 * comments once they are matched to see if they are also block delimiters. In
			 * practice, this nuance has not caused any known problems since developing blocks.
			 *
			 * <⃨!⃨-⃨-⃨ /wp:core/paragraph {"dropCap":true} /-->
			 */
			$comment_opening_at = strpos( $text, '<!--', $at );

			/*
			 * Even if the start of a potential block delimiter is not found, the document
			 * might end in a prefix of such, and in that case there is incomplete input.
			 */
			if ( false === $comment_opening_at ) {
				if ( str_ends_with( $text, '<!-' ) ) {
					$backup = 3;
				} elseif ( str_ends_with( $text, '<!' ) ) {
					$backup = 2;
				} elseif ( str_ends_with( $text, '<' ) ) {
					$backup = 1;
				} else {
					$backup = 0;
				}

				// Whether or not there is a potential delimiter, there might be an HTML span.
				if ( $after_prev_delimiter < ( $end - $backup ) ) {
					$this->state                    = self::HTML_SPAN;
					$this->after_previous_delimiter = $after_prev_delimiter;
					$this->matched_delimiter_at     = $end - $backup;
					$this->matched_delimiter_length = $backup;
					$this->open_blocks_at[]         = $after_prev_delimiter;
					$this->open_blocks_length[]     = 0;
					$this->was_void                 = true;
					return true;
				}

				/*
				 * In the case that there is the start of an HTML comment, it means that there
				 * might be a block delimiter, but it’s not possible know, therefore it’s incomplete.
				 */
				if ( $backup > 0 ) {
					goto incomplete;
				}

				// Otherwise this is the end.
				$this->state = self::COMPLETE;
				return false;
			}

			// <!-- ⃨/wp:core/paragraph {"dropCap":true} /-->
			$opening_whitespace_at = $comment_opening_at + 4;
			if ( $opening_whitespace_at >= $end ) {
				goto incomplete;
			}

			$opening_whitespace_length = strspn( $text, " \t\f\r\n", $opening_whitespace_at );

			/*
			 * The `wp` prefix cannot come before this point, but it may come after it
			 * depending on the presence of the closer. This is detected next.
			 */
			$wp_prefix_at = $opening_whitespace_at + $opening_whitespace_length;
			if ( $wp_prefix_at >= $end ) {
				goto incomplete;
			}

			if ( 0 === $opening_whitespace_length ) {
				$at = $this->find_html_comment_end( $comment_opening_at, $end );
				continue;
			}

			// <!-- /⃨wp:core/paragraph {"dropCap":true} /-->
			$has_closer = false;
			if ( '/' === $text[ $wp_prefix_at ] ) {
				$has_closer = true;
				++$wp_prefix_at;
			}

			// <!-- /w⃨p⃨:⃨core/paragraph {"dropCap":true} /-->
			if ( $wp_prefix_at < $end && 0 !== substr_compare( $text, 'wp:', $wp_prefix_at, 3 ) ) {
				if (
					( $wp_prefix_at + 2 >= $end && str_ends_with( $text, 'wp' ) ) ||
					( $wp_prefix_at + 1 >= $end && str_ends_with( $text, 'w' ) )
				) {
					goto incomplete;
				}

				$at = $this->find_html_comment_end( $comment_opening_at, $end );
				continue;
			}

			/*
			 * If the block contains no namespace, this will end up masquerading with
			 * the block name. It’s easier to first detect the span and then determine
			 * if it’s a namespace of a name.
			 *
			 * <!-- /wp:c⃨o⃨r⃨e⃨/paragraph {"dropCap":true} /-->
			 */
			$namespace_at = $wp_prefix_at + 3;
			if ( $namespace_at >= $end ) {
				goto incomplete;
			}

			$start_of_namespace = $text[ $namespace_at ];

			// The namespace must start with a-z.
			if ( 'a' > $start_of_namespace || 'z' < $start_of_namespace ) {
				$at = $this->find_html_comment_end( $comment_opening_at, $end );
				continue;
			}

			$namespace_length = 1 + strspn( $text, 'abcdefghijklmnopqrstuvwxyz0123456789-_', $namespace_at + 1 );
			$separator_at     = $namespace_at + $namespace_length;
			if ( $separator_at >= $end ) {
				goto incomplete;
			}

			// <!-- /wp:core/⃨paragraph {"dropCap":true} /-->
			$has_separator = '/' === $text[ $separator_at ];
			if ( $has_separator ) {
				$name_at = $separator_at + 1;

				if ( $name_at >= $end ) {
					goto incomplete;
				}

				// <!-- /wp:core/p⃨a⃨r⃨a⃨g⃨r⃨a⃨p⃨h⃨ {"dropCap":true} /-->
				$start_of_name = $text[ $name_at ];
				if ( 'a' > $start_of_name || 'z' < $start_of_name ) {
					$at = $this->find_html_comment_end( $comment_opening_at, $end );
					continue;
				}

				$name_length = 1 + strspn( $text, 'abcdefghijklmnopqrstuvwxyz0123456789-_', $name_at + 1 );
			} else {
				$name_at     = $namespace_at;
				$name_length = $namespace_length;
			}

			if ( $name_at + $name_length >= $end ) {
				goto incomplete;
			}

			/*
			 * For this next section of the delimiter, it could be the JSON attributes
			 * or it could be the end of the comment. Assume that the JSON is there and
			 * update if it’s not.
			 */

			// <!-- /wp:core/paragraph ⃨{"dropCap":true} /-->
			$after_name_whitespace_at     = $name_at + $name_length;
			$after_name_whitespace_length = strspn( $text, " \t\f\r\n", $after_name_whitespace_at );
			$json_at                      = $after_name_whitespace_at + $after_name_whitespace_length;

			if ( $json_at >= $end ) {
				goto incomplete;
			}

			if ( 0 === $after_name_whitespace_length ) {
				$at = $this->find_html_comment_end( $comment_opening_at, $end );
				continue;
			}

			// <!-- /wp:core/paragraph {⃨"dropCap":true} /-->
			$has_json    = '{' === $text[ $json_at ];
			$json_length = 0;

			/*
			 * For the final span of the delimiter it's most efficient to find the end of the
			 * HTML comment and work backwards. This prevents complicated parsing inside the
			 * JSON span, which is not allowed to contain the HTML comment terminator.
			 *
			 * This also matches the behavior in the official block parser,
			 * even though it allows for matching invalid JSON content.
			 *
			 * <!-- /wp:core/paragraph {"dropCap":true} /-⃨-⃨>⃨
			 */
			$comment_closing_at = strpos( $text, '-->', $json_at );
			if ( false === $comment_closing_at ) {
				goto incomplete;
			}

			// <!-- /wp:core/paragraph {"dropCap":true} /⃨-->
			if ( '/' === $text[ $comment_closing_at - 1 ] ) {
				$has_void_flag    = true;
				$void_flag_length = 1;
			} else {
				$has_void_flag    = false;
				$void_flag_length = 0;
			}

			/*
			 * If there's no JSON, then the span of text after the name
			 * until the comment closing must be completely whitespace.
			 * Otherwise it’s a normal HTML comment.
			 */
			if ( ! $has_json ) {
				if ( $after_name_whitespace_at + $after_name_whitespace_length === $comment_closing_at - $void_flag_length ) {
					// This must be a block delimiter!
					$this->state = self::MATCHED;
					break;
				}

				$at = $this->find_html_comment_end( $comment_opening_at, $end );
				continue;
			}

			/*
			 * There's JSON, so attempt to find its boundary.
			 *
			 * @todo It’s likely faster to scan forward instead of in reverse.
			 *
			 * <!-- /wp:core/paragraph {"dropCap":true}⃨ ⃨/-->
			 */
			$after_json_whitespace_length = 0;
			for ( $char_at = $comment_closing_at - $void_flag_length - 1; $char_at > $json_at; $char_at-- ) {
				$char = $text[ $char_at ];

				switch ( $char ) {
					case ' ':
					case "\t":
					case "\f":
					case "\r":
					case "\n":
						++$after_json_whitespace_length;
						continue 2;

					case '}':
						$json_length = $char_at - $json_at + 1;
						break 2;

					default:
						++$at;
						continue 3;
				}
			}

			/*
			 * This covers cases where there is no terminating “}” or where
			 * mandatory whitespace is missing.
			 */
			if ( 0 === $json_length || 0 === $after_json_whitespace_length ) {
				$at = $this->find_html_comment_end( $comment_opening_at, $end );
				continue;
			}

			// This must be a block delimiter!
			$this->state = self::MATCHED;
			break;
		}

		// The end of the document was reached without a match.
		if ( self::MATCHED !== $this->state ) {
			$this->state = self::COMPLETE;
			return false;
		}

		/*
		 * From this point forward, a delimiter has been matched. There
		 * might also be an HTML span that appears before the delimiter.
		 */

		$this->after_previous_delimiter = $after_prev_delimiter;

		$this->matched_delimiter_at     = $comment_opening_at;
		$this->matched_delimiter_length = $comment_closing_at + 3 - $comment_opening_at;

		$this->namespace_at = $namespace_at;
		$this->name_at      = $name_at;
		$this->name_length  = $name_length;

		$this->json_at     = $json_at;
		$this->json_length = $json_length;

		/*
		 * When delimiters contain both the void flag and the closing flag
		 * they shall be interpreted as void blocks, per the spec parser.
		 */
		if ( $has_void_flag ) {
			$this->type          = self::VOID;
			$this->next_stack_op = 'void';
		} elseif ( $has_closer ) {
			$this->type          = self::CLOSER;
			$this->next_stack_op = 'pop';

			/*
			 * @todo Check if the name matches and bail according to the spec parser.
			 *       The default parser doesn’t examine the names.
			 */
		} else {
			$this->type          = self::OPENER;
			$this->next_stack_op = 'push';
		}

		$this->has_closing_flag = $has_closer;

		// HTML spans are visited before the delimiter that follows them.
		if ( $comment_opening_at > $after_prev_delimiter ) {
			$this->state                = self::HTML_SPAN;
			$this->open_blocks_at[]     = $after_prev_delimiter;
			$this->open_blocks_length[] = 0;
			$this->was_void             = true;

			return true;
		}

		// If there were no HTML spans then flush the enqueued stack operations immediately.
		switch ( $this->next_stack_op ) {
			case 'void':
				$this->was_void             = true;
				$this->open_blocks_at[]     = $namespace_at;
				$this->open_blocks_length[] = $name_at + $name_length - $namespace_at;
				break;

			case 'push':
				$this->open_blocks_at[]     = $namespace_at;
				$this->open_blocks_length[] = $name_at + $name_length - $namespace_at;
				break;

			case 'pop':
				array_pop( $this->open_blocks_at );
				array_pop( $this->open_blocks_length );
				break;
		}

		$this->next_stack_op = null;

		return true;

		incomplete:
		$this->state      = self::COMPLETE;
		$this->last_error = self::INCOMPLETE_INPUT;
		return false;
	}

	/**
	 * Returns an array containing the names of the currently-open blocks, in order
	 * from outermost to innermost, with HTML spans indicated as “#html”.
	 *
	 * Example:
	 *
	 *     // Freeform HTML content is an HTML span.
	 *     $processor = new WP_Block_Processor( 'Just text' );
	 *     $processor->next_token();
	 *     array( '#text' ) === $processor->get_breadcrumbs();
	 *
	 *     $processor = new WP_Block_Processor( '<!-- wp:a --><!-- wp:b --><!-- wp:c /--><!-- /wp:b --><!-- /wp:a -->' );
	 *     $processor->next_token();
	 *     array( 'core/a' ) === $processor->get_breadcrumbs();
	 *     $processor->next_token();
	 *     array( 'core/a', 'core/b' ) === $processor->get_breadcrumbs();
	 *     $processor->next_token();
	 *     // Void blocks are only open while visiting them.
	 *     array( 'core/a', 'core/b', 'core/c' ) === $processor->get_breadcrumbs();
	 *     $processor->next_token();
	 *     // Blocks are closed before visiting their closing delimiter.
	 *     array( 'core/a' ) === $processor->get_breadcrumbs();
	 *     $processor->next_token();
	 *     array() === $processor->get_breadcrumbs();
	 *
	 *     // Inner HTML is also an HTML span.
	 *     $processor = new WP_Block_Processor( '<!-- wp:a -->Inner HTML<!-- /wp:a -->' );
	 *     $processor->next_token();
	 *     $processor->next_token();
	 *     array( 'core/a', '#html' ) === $processor->get_breadcrumbs();
	 *
	 * @since 6.9.0
	 *
	 * @return string[]
	 */
	public function get_breadcrumbs(): array {
		$breadcrumbs = array_fill( 0, count( $this->open_blocks_at ), null );

		/*
		 * Since HTML spans can only be at the very end, set the normalized block name for
		 * each open element and then work backwards after creating the array. This allows
		 * for the elimination of a conditional on each iteration of the loop.
		 */
		foreach ( $this->open_blocks_at as $i => $at ) {
			$block_type        = substr( $this->source_text, $at, $this->open_blocks_length[ $i ] );
			$breadcrumbs[ $i ] = self::normalize_block_type( $block_type );
		}

		if ( isset( $i ) && 0 === $this->open_blocks_length[ $i ] ) {
			$breadcrumbs[ $i ] = '#html';
		}

		return $breadcrumbs;
	}

	/**
	 * Returns the depth of the open blocks where the processor is currently matched.
	 *
	 * Depth increases before visiting openers and void blocks and decreases before
	 * visiting closers. HTML spans behave like void blocks.
	 *
	 * @since 6.9.0
	 *
	 * @return int
	 */
	public function get_depth(): int {
		return count( $this->open_blocks_at );
	}

	/**
	 * Extracts a block object, and all inner content, starting at a matched opening
	 * block delimiter, or at a matched top-level HTML span as freeform HTML content.
	 *
	 * Use this function to extract some blocks within a document, but not all. For example,
	 * one might want to find image galleries, parse them, modify them, and then reserialize
	 * them in place.
	 *
	 * Once this function returns, the parser will be matched on token following the close
	 * of the given block.
	 *
	 * The return type of this method is compatible with the return of {@see \parse_blocks()}.
	 *
	 * Example:
	 *
	 *     $processor = new WP_Block_Processor( $post_content );
	 *     if ( ! $processor->next_block( 'gallery' ) ) {
	 *         return $post_content;
	 *     }
	 *
	 *     $gallery_at  = $processor->get_span()->start;
	 *     $gallery     = $processor->extract_full_block_and_advance();
	 *     $ends_before = $processor->get_span();
	 *     $ends_before = $ends_before->start ?? strlen( $post_content );
	 *
	 *     $new_gallery = update_gallery( $gallery );
	 *     $new_gallery = serialize_block( $new_gallery );
	 *
	 *     return (
	 *         substr( $post_content, 0, $gallery_at ) .
	 *         $new_gallery .
	 *         substr( $post_content, $ends_before )
	 *     );
	 *
	 * @since 6.9.0
	 *
	 * @return array[]|null {
	 *     Array of block structures.
	 *
	 *     @type array ...$0 {
	 *         An associative array of a single parsed block object. See WP_Block_Parser_Block.
	 *
	 *         @type string|null $blockName    Name of block.
	 *         @type array       $attrs        Attributes from block comment delimiters.
	 *         @type array[]     $innerBlocks  List of inner blocks. An array of arrays that
	 *                                         have the same structure as this one.
	 *         @type string      $innerHTML    HTML from inside block comment delimiters.
	 *         @type array       $innerContent List of string fragments and null markers where
	 *                                         inner blocks were found.
	 *     }
	 * }
	 */
	public function extract_full_block_and_advance(): ?array {
		if ( $this->is_html() ) {
			$chunk = $this->get_html_content();

			return array(
				'blockName'    => null,
				'attrs'        => array(),
				'innerBlocks'  => array(),
				'innerHTML'    => $chunk,
				'innerContent' => array( $chunk ),
			);
		}

		$block = array(
			'blockName'    => $this->get_block_type(),
			'attrs'        => $this->allocate_and_return_parsed_attributes() ?? array(),
			'innerBlocks'  => array(),
			'innerHTML'    => '',
			'innerContent' => array(),
		);

		$depth = $this->get_depth();
		while ( $this->next_token() && $this->get_depth() > $depth ) {
			if ( $this->is_html() ) {
				$chunk                   = $this->get_html_content();
				$block['innerHTML']     .= $chunk;
				$block['innerContent'][] = $chunk;
				continue;
			}

			/**
			 * Inner blocks.
			 *
			 * @todo This is a decent place to call {@link \render_block()}
			 * @todo Use iteration instead of recursion, or at least refactor to tail-call form.
			 */
			if ( $this->opens_block() ) {
				$inner_block             = $this->extract_full_block_and_advance();
				$block['innerBlocks'][]  = $inner_block;
				$block['innerContent'][] = null;
			}

			/*
			 * Because the parser has advanced past the closing block token, it
			 * may be matched on an HTML span. This needs to be processed before
			 * moving on to the next token at the start of the next loop iteration.
			 */
			if ( $this->is_html() ) {
				$chunk                   = $this->get_html_content();
				$block['innerHTML']     .= $chunk;
				$block['innerContent'][] = $chunk;
			}
		}

		return $block;
	}

	/**
	 * Returns the byte-offset after the ending character of an HTML comment,
	 * assuming the proper starting byte offset.
	 *
	 * @since 6.9.0
	 *
	 * @param int $comment_starting_at Where the HTML comment started, the leading `<`.
	 * @param int $search_end          Last offset in which to search, for limiting search span.
	 * @return int Offset after the current HTML comment ends, or `$search_end` if no end was found.
	 */
	private function find_html_comment_end( int $comment_starting_at, int $search_end ): int {
		$text = $this->source_text;

		// Find span-of-dashes comments which look like `<!----->`.
		$span_of_dashes = strspn( $text, '-', $comment_starting_at + 2 );
		if (
			$comment_starting_at + 2 + $span_of_dashes < $search_end &&
			'>' === $text[ $comment_starting_at + 2 + $span_of_dashes ]
		) {
			return $comment_starting_at + $span_of_dashes + 1;
		}

		// Otherwise, there are other characters inside the comment, find the first `-->` or `--!>`.
		$now_at = $comment_starting_at + 4;
		while ( $now_at < $search_end ) {
			$dashes_at = strpos( $text, '--', $now_at );
			if ( false === $dashes_at ) {
				return $search_end;
			}

			$closer_must_be_at = $dashes_at + 2 + strspn( $text, '-', $dashes_at + 2 );
			if ( $closer_must_be_at < $search_end && '!' === $text[ $closer_must_be_at ] ) {
				++$closer_must_be_at;
			}

			if ( $closer_must_be_at < $search_end && '>' === $text[ $closer_must_be_at ] ) {
				return $closer_must_be_at + 1;
			}

			++$now_at;
		}

		return $search_end;
	}

	/**
	 * Indicates if the last attempt to parse a block comment delimiter
	 * failed, if set, otherwise `null` if the last attempt succeeded.
	 *
	 * @since 6.9.0
	 *
	 * @return string|null Error from last attempt at parsing next block delimiter,
	 *                     or `null` if last attempt succeeded.
	 */
	public function get_last_error(): ?string {
		return $this->last_error;
	}

	/**
	 * Indicates if the last attempt to parse a block’s JSON attributes failed.
	 *
	 * @see \json_last_error()
	 *
	 * @since 6.9.0
	 *
	 * @return int JSON_ERROR_ code from last attempt to parse block JSON attributes.
	 */
	public function get_last_json_error(): int {
		return $this->last_json_error;
	}

	/**
	 * Returns the type of the block comment delimiter.
	 *
	 * One of:
	 *
	 *  - {@see self::OPENER}
	 *  - {@see self::CLOSER}
	 *  - {@see self::VOID}
	 *  - `null`
	 *
	 * @since 6.9.0
	 *
	 * @return string|null type of the block comment delimiter, if currently matched.
	 */
	public function get_delimiter_type(): ?string {
		switch ( $this->state ) {
			case self::HTML_SPAN:
				return self::VOID;

			case self::MATCHED:
				return $this->type;

			default:
				return null;
		}
	}

	/**
	 * Returns whether the delimiter contains the closing flag.
	 *
	 * This should be avoided except in cases of custom error-handling
	 * with block closers containing the void flag. For normative use,
	 * {@see self::get_delimiter_type()}.
	 *
	 * @since 6.9.0
	 *
	 * @return bool Whether the currently-matched block delimiter contains the closing flag.
	 */
	public function has_closing_flag(): bool {
		return $this->has_closing_flag;
	}

	/**
	 * Indicates if the block delimiter represents a block of the given type.
	 *
	 * Since the “core” namespace may be implicit, it’s allowable to pass
	 * either the fully-qualified block type with namespace and block name
	 * as well as the shorthand version only containing the block name, if
	 * the desired block is in the “core” namespace.
	 *
	 * Since freeform HTML content is non-block content, it has no block type.
	 * Passing the wildcard “*” will, however, return true for all block types,
	 * even the implicit freeform content, though not for spans of inner HTML.
	 *
	 * Example:
	 *
	 *     $is_core_paragraph = $processor->is_block_type( 'paragraph' );
	 *     $is_core_paragraph = $processor->is_block_type( 'core/paragraph' );
	 *     $is_formula        = $processor->is_block_type( 'math-block/formula' );
	 *
	 * @param string $block_type Block type name for the desired block.
	 *                           E.g. "paragraph", "core/paragraph", "math-blocks/formula".
	 * @return bool Whether this delimiter represents a block of the given type.
	 */
	public function is_block_type( string $block_type ): bool {
		if ( '*' === $block_type ) {
			return true;
		}

		if ( $this->is_html() ) {
			// This is a core/freeform text block, it’s special.
			if ( 0 === ( $this->open_blocks_length[0] ?? null ) ) {
				return (
					'core/freeform' === $block_type ||
					'freeform' === $block_type
				);
			}

			// Otherwise this is innerHTML and not a block.
			return false;
		}

		return $this->are_equal_block_types( $this->source_text, $this->namespace_at, $this->name_at - $this->namespace_at + $this->name_length, $block_type, 0, strlen( $block_type ) );
	}

	/**
	 * Given two spans of text, indicate if they represent identical block types.
	 *
	 * This function normalizes block types to account for implicit core namespacing.
	 *
	 * Note! This function only returns valid results when the complete block types are
	 *       represented in the span offsets and lengths. This means that the full optional
	 *       namespace and block name must be represented in the input arguments.
	 *
	 * Example:
	 *
	 *              0    5   10   15   20   25   30   35   40
	 *     $text = '<!-- wp:block --><!-- /wp:core/block -->';
	 *
	 *     true  === WP_Block_Processor::are_equal_block_types( $text, 9, 5, $text, 27, 10 );
	 *     false === WP_Block_Processor::are_equal_block_types( $text, 9, 5, 'my/block', 0, 8 );
	 *
	 * @since 6.9.0
	 *
	 * @param string $a_text   Text in which first block type appears.
	 * @param int    $a_at     Byte offset into text in which first block type starts.
	 * @param int    $a_length Byte length of first block type.
	 * @param string $b_text   Text in which second block type appears (may be the same as the first text).
	 * @param int    $b_at     Byte offset into text in which second block type starts.
	 * @param int    $b_length Byte length of second block type.
	 * @return bool Whether the spans of text represent identical block types, normalized for namespacing.
	 */
	public static function are_equal_block_types( string $a_text, int $a_at, int $a_length, string $b_text, int $b_at, int $b_length ): bool {
		$a_ns_length = strcspn( $a_text, '/', $a_at, $a_length );
		$b_ns_length = strcspn( $b_text, '/', $b_at, $b_length );

		$a_has_ns = $a_ns_length !== $a_length;
		$b_has_ns = $b_ns_length !== $b_length;

		// Both contain namespaces.
		if ( $a_has_ns && $b_has_ns ) {
			if ( $a_length !== $b_length ) {
				return false;
			}

			$a_block_type = substr( $a_text, $a_at, $a_length );

			return 0 === substr_compare( $b_text, $a_block_type, $b_at, $b_length );
		}

		if ( $a_has_ns ) {
			$b_block_type = 'core/' . substr( $b_text, $b_at, $b_length );

			return (
				strlen( $b_block_type ) === $a_length &&
				0 === substr_compare( $a_text, $b_block_type, $a_at, $a_length )
			);
		}

		if ( $b_has_ns ) {
			$a_block_type = 'core/' . substr( $a_text, $a_at, $a_length );

			return (
				strlen( $a_block_type ) === $b_length &&
				0 === substr_compare( $b_text, $a_block_type, $b_at, $b_length )
			);
		}

		// Neither contains a namespace.
		if ( $a_length !== $b_length ) {
			return false;
		}

		$a_name = substr( $a_text, $a_at, $a_length );

		return 0 === substr_compare( $b_text, $a_name, $b_at, $b_length );
	}

	/**
	 * Indicates if the matched delimiter is an opening or void delimiter of the given type,
	 * if a type is provided, otherwise if it opens any block or implicit freeform HTML content.
	 *
	 * This is a helper method to ease handling of code inspecting where blocks start, and for
	 * checking if the blocks are of a given type. The function is variadic to allow for
	 * checking if the delimiter opens one of many possible block types.
	 *
	 * To advance to the start of a block {@see self::next_block()}.
	 *
	 * Example:
	 *
	 *     $processor = new WP_Block_Processor( $html );
	 *     while ( $processor->next_delimiter() ) {
	 *         if ( $processor->opens_block( 'core/code', 'syntaxhighlighter/code' ) ) {
	 *             echo "Found code!";
	 *             continue;
	 *         }
	 *
	 *         if ( $processor->opens_block( 'core/image' ) ) {
	 *             echo "Found an image!";
	 *             continue;
	 *         }
	 *
	 *         if ( $processor->opens_block() ) {
	 *             echo "Found a new block!";
	 *         }
	 *     }
	 *
	 * @since 6.9.0
	 *
	 * @see self::is_block_type()
	 *
	 * @param string[] $block_type Optional. Is the matched block type one of these?
	 *                             If none are provided, will not test block type.
	 * @return bool Whether the matched block delimiter opens a block, and whether it
	 *              opens a block of one of the given block types, if provided.
	 */
	public function opens_block( string ...$block_type ): bool {
		// HTML spans only open implicit freeform content at the top level.
		if ( self::HTML_SPAN === $this->state && 1 !== count( $this->open_blocks_at ) ) {
			return false;
		}

		/*
		 * Because HTML spans are discovered after the next delimiter is found,
		 * the delimiter type when visiting HTML spans refers to the type of the
		 * following delimiter. Therefore the HTML case is handled by checking
		 * the state and depth of the stack of open block.
		 */
		if ( self::CLOSER === $this->type && ! $this->is_html() ) {
			return false;
		}

		if ( count( $block_type ) === 0 ) {
			return true;
		}

		foreach ( $block_type as $block ) {
			if ( $this->is_block_type( $block ) ) {
				return true;
			}
		}

		return false;
	}

	/**
	 * Indicates if the matched delimiter is an HTML span.
	 *
	 * @since 6.9.0
	 *
	 * @see self::is_non_whitespace_html()
	 *
	 * @return bool Whether the processor is matched on an HTML span.
	 */
	public function is_html(): bool {
		return self::HTML_SPAN === $this->state;
	}

	/**
	 * Indicates if the matched delimiter is an HTML span and comprises more
	 * than whitespace characters, i.e. contains real content.
	 *
	 * Many block serializers introduce newlines between block delimiters,
	 * so the presence of top-level non-block content does not imply that
	 * there are “real” freeform HTML blocks. Checking if there is content
	 * beyond whitespace is a more certain check, such as for determining
	 * whether to load CSS for the freeform or fallback block type.
	 *
	 * @since 6.9.0
	 *
	 * @see self::is_html()
	 *
	 * @return bool Whether the currently-matched delimiter is an HTML
	 *              span containing non-whitespace text.
	 */
	public function is_non_whitespace_html(): bool {
		if ( ! $this->is_html() ) {
			return false;
		}

		$length = $this->matched_delimiter_at - $this->after_previous_delimiter;

		$whitespace_length = strspn(
			$this->source_text,
			" \t\f\r\n",
			$this->after_previous_delimiter,
			$length
		);

		return $whitespace_length !== $length;
	}

	/**
	 * Returns the string content of a matched HTML span, or `null` otherwise.
	 *
	 * @since 6.9.0
	 *
	 * @return string|null Raw HTML content, or `null` if not currently matched on HTML.
	 */
	public function get_html_content(): ?string {
		if ( ! $this->is_html() ) {
			return null;
		}

		return substr(
			$this->source_text,
			$this->after_previous_delimiter,
			$this->matched_delimiter_at - $this->after_previous_delimiter
		);
	}

	/**
	 * Allocates a substring for the block type and returns the fully-qualified
	 * name, including the namespace, if matched on a delimiter, otherwise `null`.
	 *
	 * This function is like {@see self::get_printable_block_type()} but when
	 * paused on a freeform HTML block, will return `null` instead of “core/freeform”.
	 * The `null` behavior matches what {@see \parse_blocks()} returns but may not
	 * be as useful as having a string value.
	 *
	 * This function allocates a substring for the given block type. This
	 * allocation will be small and likely fine in most cases, but it's
	 * preferable to call {@see self::is_block_type()} if only needing
	 * to know whether the delimiter is for a given block type, as that
	 * function is more efficient for this purpose and avoids the allocation.
	 *
	 * Example:
	 *
	 *     // Avoid.
	 *     'core/paragraph' = $processor->get_block_type();
	 *
	 *     // Prefer.
	 *     $processor->is_block_type( 'core/paragraph' );
	 *     $processor->is_block_type( 'paragraph' );
	 *     $processor->is_block_type( 'core/freeform' );
	 *
	 *     // Freeform HTML content has no block type.
	 *     $processor = new WP_Block_Processor( 'non-block content' );
	 *     $processor->next_token();
	 *     null === $processor->get_block_type();
	 *
	 * @since 6.9.0
	 *
	 * @see self::are_equal_block_types()
	 *
	 * @return string|null Fully-qualified block namespace and type, e.g. "core/paragraph",
	 *                     if matched on an explicit delimiter, otherwise `null`.
	 */
	public function get_block_type(): ?string {
		if (
			self::READY === $this->state ||
			self::COMPLETE === $this->state ||
			self::INCOMPLETE_INPUT === $this->state
		) {
			return null;
		}

		// This is a core/freeform text block, it’s special.
		if ( $this->is_html() ) {
			return null;
		}

		$block_type = substr( $this->source_text, $this->namespace_at, $this->name_at - $this->namespace_at + $this->name_length );
		return self::normalize_block_type( $block_type );
	}

	/**
	 * Allocates a printable substring for the block type and returns the fully-qualified
	 * name, including the namespace, if matched on a delimiter or freeform block, otherwise `null`.
	 *
	 * This function is like {@see self::get_block_type()} but when paused on a freeform
	 * HTML block, will return “core/freeform” instead of `null`. The `null` behavior matches
	 * what {@see \parse_blocks()} returns but may not be as useful as having a string value.
	 *
	 * This function allocates a substring for the given block type. This
	 * allocation will be small and likely fine in most cases, but it's
	 * preferable to call {@see self::is_block_type()} if only needing
	 * to know whether the delimiter is for a given block type, as that
	 * function is more efficient for this purpose and avoids the allocation.
	 *
	 * Example:
	 *
	 *     // Avoid.
	 *     'core/paragraph' = $processor->get_printable_block_type();
	 *
	 *     // Prefer.
	 *     $processor->is_block_type( 'core/paragraph' );
	 *     $processor->is_block_type( 'paragraph' );
	 *     $processor->is_block_type( 'core/freeform' );
	 *
	 *     // Freeform HTML content is given an implicit type.
	 *     $processor = new WP_Block_Processor( 'non-block content' );
	 *     $processor->next_token();
	 *     'core/freeform' === $processor->get_printable_block_type();
	 *
	 * @since 6.9.0
	 *
	 * @see self::are_equal_block_types()
	 *
	 * @return string|null Fully-qualified block namespace and type, e.g. "core/paragraph",
	 *                     if matched on an explicit delimiter or freeform block, otherwise `null`.
	 */
	public function get_printable_block_type(): ?string {
		if (
			self::READY === $this->state ||
			self::COMPLETE === $this->state ||
			self::INCOMPLETE_INPUT === $this->state
		) {
			return null;
		}

		// This is a core/freeform text block, it’s special.
		if ( $this->is_html() ) {
			return 1 === count( $this->open_blocks_at )
				? 'core/freeform'
				: '#innerHTML';
		}

		$block_type = substr( $this->source_text, $this->namespace_at, $this->name_at - $this->namespace_at + $this->name_length );
		return self::normalize_block_type( $block_type );
	}

	/**
	 * Normalizes a block name to ensure that missing implicit “core” namespaces are present.
	 *
	 * Example:
	 *
	 *     'core/paragraph' === WP_Block_Processor::normalize_block_byte( 'paragraph' );
	 *     'core/paragraph' === WP_Block_Processor::normalize_block_byte( 'core/paragraph' );
	 *     'my/paragraph'   === WP_Block_Processor::normalize_block_byte( 'my/paragraph' );
	 *
	 * @since 6.9.0
	 *
	 * @param string $block_type Valid block name, potentially without a namespace.
	 * @return string Fully-qualified block type including namespace.
	 */
	public static function normalize_block_type( string $block_type ): string {
		return false === strpos( $block_type, '/' )
			? "core/{$block_type}"
			: $block_type;
	}

	/**
	 * Returns a lazy wrapper around the block attributes, which can be used
	 * for efficiently interacting with the JSON attributes.
	 *
	 * This stub hints that there should be a lazy interface for parsing
	 * block attributes but doesn’t define it. It serves both as a placeholder
	 * for one to come as well as a guard against implementing an eager
	 * function in its place.
	 *
	 * @throws Exception This function is a stub for subclasses to implement
	 *                   when providing streaming attribute parsing.
	 *
	 * @since 6.9.0
	 *
	 * @see self::allocate_and_return_parsed_attributes()
	 *
	 * @return never
	 */
	public function get_attributes() {
		throw new Exception( 'Lazy attribute parsing not yet supported' );
	}

	/**
	 * Attempts to parse and return the entire JSON attributes from the delimiter,
	 * allocating memory and processing the JSON span in the process.
	 *
	 * This does not return any parsed attributes for a closing block delimiter
	 * even if there is a span of JSON content; this JSON is a parsing error.
	 *
	 * Consider calling {@see static::get_attributes()} instead if it's not
	 * necessary to read all the attributes at the same time, as that provides
	 * a more efficient mechanism for typical use cases.
	 *
	 * Since the JSON span inside the comment delimiter may not be valid JSON,
	 * this function will return `null` if it cannot parse the span and set the
	 * {@see static::get_last_json_error()} to the appropriate JSON_ERROR_ constant.
	 *
	 * If the delimiter contains no JSON span, it will also return `null`,
	 * but the last error will be set to {@see \JSON_ERROR_NONE}.
	 *
	 * Example:
	 *
	 *     $processor = new WP_Block_Processor( '<!-- wp:image {"url": "https://wordpress.org/favicon.ico"} -->' );
	 *     $processor->next_delimiter();
	 *     $memory_hungry_and_slow_attributes = $processor->allocate_and_return_parsed_attributes();
	 *     $memory_hungry_and_slow_attributes === array( 'url' => 'https://wordpress.org/favicon.ico' );
	 *
	 *     $processor = new WP_Block_Processor( '<!-- /wp:image {"url": "https://wordpress.org/favicon.ico"} -->' );
	 *     $processor->next_delimiter();
	 *     null            = $processor->allocate_and_return_parsed_attributes();
	 *     JSON_ERROR_NONE = $processor->get_last_json_error();
	 *
	 *     $processor = new WP_Block_Processor( '<!-- wp:separator {} /-->' );
	 *     $processor->next_delimiter();
	 *     array() === $processor->allocate_and_return_parsed_attributes();
	 *
	 *     $processor = new WP_Block_Processor( '<!-- wp:separator /-->' );
	 *     $processor->next_delimiter();
	 *     null = $processor->allocate_and_return_parsed_attributes();
	 *
	 *     $processor = new WP_Block_Processor( '<!-- wp:image {"url} -->' );
	 *     $processor->next_delimiter();
	 *     null                 = $processor->allocate_and_return_parsed_attributes();
	 *     JSON_ERROR_CTRL_CHAR = $processor->get_last_json_error();
	 *
	 * @since 6.9.0
	 *
	 * @return array|null Parsed JSON attributes, if present and valid, otherwise `null`.
	 */
	public function allocate_and_return_parsed_attributes(): ?array {
		$this->last_json_error = JSON_ERROR_NONE;

		if ( self::CLOSER === $this->type || $this->is_html() || 0 === $this->json_length ) {
			return null;
		}

		$json_span = substr( $this->source_text, $this->json_at, $this->json_length );
		$parsed    = json_decode( $json_span, null, 512, JSON_OBJECT_AS_ARRAY | JSON_INVALID_UTF8_SUBSTITUTE );

		$last_error            = json_last_error();
		$this->last_json_error = $last_error;

		return ( JSON_ERROR_NONE === $last_error && is_array( $parsed ) )
			? $parsed
			: null;
	}

	/**
	 * Returns the span representing the currently-matched delimiter, if matched, otherwise `null`.
	 *
	 * Example:
	 *
	 *     $processor = new WP_Block_Processor( '<!-- wp:void /-->' );
	 *     null     === $processor->get_span();
	 *
	 *     $processor->next_delimiter();
	 *     WP_HTML_Span( 0, 17 ) === $processor->get_span();
	 *
	 * @since 6.9.0
	 *
	 * @return WP_HTML_Span|null Span of text in source text spanning matched delimiter.
	 */
	public function get_span(): ?WP_HTML_Span {
		switch ( $this->state ) {
			case self::HTML_SPAN:
				return new WP_HTML_Span( $this->after_previous_delimiter, $this->matched_delimiter_at - $this->after_previous_delimiter );

			case self::MATCHED:
				return new WP_HTML_Span( $this->matched_delimiter_at, $this->matched_delimiter_length );

			default:
				return null;
		}
	}

	//
	// Constant declarations that would otherwise pollute the top of the class.
	//

	/**
	 * Indicates that the block comment delimiter closes an open block.
	 *
	 * @see self::$type
	 *
	 * @since 6.9.0
	 */
	const CLOSER = 'closer';

	/**
	 * Indicates that the block comment delimiter opens a block.
	 *
	 * @see self::$type
	 *
	 * @since 6.9.0
	 */
	const OPENER = 'opener';

	/**
	 * Indicates that the block comment delimiter represents a void block
	 * with no inner content of any kind.
	 *
	 * @see self::$type
	 *
	 * @since 6.9.0
	 */
	const VOID = 'void';

	/**
	 * Indicates that the processor is ready to start parsing but hasn’t yet begun.
	 *
	 * @see self::$state
	 *
	 * @since 6.9.0
	 */
	const READY = 'processor-ready';

	/**
	 * Indicates that the processor is matched on an explicit block delimiter.
	 *
	 * @see self::$state
	 *
	 * @since 6.9.0
	 */
	const MATCHED = 'processor-matched';

	/**
	 * Indicates that the processor is matched on the opening of an implicit freeform delimiter.
	 *
	 * @see self::$state
	 *
	 * @since 6.9.0
	 */
	const HTML_SPAN = 'processor-html-span';

	/**
	 * Indicates that the parser started parsing a block comment delimiter, but
	 * the input document ended before it could finish. The document was likely truncated.
	 *
	 * @see self::$state
	 *
	 * @since 6.9.0
	 */
	const INCOMPLETE_INPUT = 'incomplete-input';

	/**
	 * Indicates that the processor has finished parsing and has nothing left to scan.
	 *
	 * @see self::$state
	 *
	 * @since 6.9.0
	 */
	const COMPLETE = 'processor-complete';
}
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