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Editing: class-wp-block-processor.php
<?php /** * Efficiently scan through block structure in document without parsing * the entire block tree and all of its JSON attributes into memory. * * @package WordPress * @subpackage Blocks * @since 6.9.0 */ /** * Class for efficiently scanning through block structure in a document * without parsing the entire block tree and JSON attributes into memory. * * ## Overview * * This class is designed to help analyze and modify block structure in a * streaming fashion and to bridge the gap between parsed block trees and * the text representing them. * * Use-cases for this class include but are not limited to: * * - Counting block types in a document. * - Queuing stylesheets based on the presence of various block types. * - Modifying blocks of a given type, i.e. migrations, updates, and styling. * - Searching for content of specific kinds, e.g. checking for blocks * with certain theme support attributes, or block bindings. * - Adding CSS class names to the element wrapping a block’s inner blocks. * * > *Note!* If a fully-parsed block tree of a document is necessary, including * > all the parsed JSON attributes, nested blocks, and HTML, consider * > using {@see \parse_blocks()} instead which will parse the document * > in one swift pass. * * For typical usage, jump first to the methods {@see self::next_block()}, * {@see self::next_delimiter()}, or {@see self::next_token()}. * * ### Values * * As a lower-level interface than {@see parse_blocks()} this class follows * different performance-focused values: * * - Minimize allocations so that documents of any size may be processed * on a fixed or marginal amount of memory. * - Make hidden costs explicit so that calling code only has to pay the * performance penalty for features it needs. * - Operate with a streaming and re-entrant design to make it possible * to operate on chunks of a document and to resume after pausing. * * This means that some operations might appear more cumbersome than one * might expect. This design tradeoff opens up opportunity to wrap this in * a convenience class to add higher-level functionality. * * ## Concepts * * All text documents can be considered a block document containing a combination * of “freeform HTML” and explicit block structure. Block structure forms through * special HTML comments called _delimiters_ which include a block type and, * optionally, block attributes encoded as a JSON object payload. * * This processor is designed to scan through a block document from delimiter to * delimiter, tracking how the delimiters impact the structure of the document. * Spans of HTML appear between delimiters. If these spans exist at the top level * of the document, meaning there is no containing block around them, they are * considered freeform HTML content. If, however, they appear _inside_ block * structure they are interpreted as `innerHTML` for the containing block. * * ### Tokens and scanning * * As the processor scans through a document is reports information about the token * on which is pauses. Tokens represent spans of text in the input comprising block * delimiters and spans of HTML. * * - {@see self::next_token()} visits every contiguous subspan of text in the * input document. This includes all explicit block comment delimiters and spans * of HTML content (whether freeform or inner HTML). * - {@see self::next_delimiter()} visits every explicit block comment delimiter * unless passed a block type which covers freeform HTML content. In these cases * it will stop at top-level spans of HTML and report a `null` block type. * - {@see self::next_block()} visits every block delimiter which _opens_ a block. * This includes opening block delimiters as well as void block delimiters. With * the same exception as above for freeform HTML block types, this will visit * top-level spans of HTML content. * * When matched on a particular token, the following methods provide structural * and textual information about it: * * - {@see self::get_delimiter_type()} reports whether the delimiter is an opener, * a closer, or if it represents a whole void block. * - {@see self::get_block_type()} reports the fully-qualified block type which * the delimiter represents. * - {@see self::get_printable_block_type()} reports the fully-qualified block type, * but returns `core/freeform` instead of `null` for top-level freeform HTML content. * - {@see self::is_block_type()} indicates if the delimiter represents a block of * the given block type, or wildcard or pseudo-block type described below. * - {@see self::opens_block()} indicates if the delimiter opens a block of one * of the provided block types. Opening, void, and top-level freeform HTML content * all open blocks. * - {@see static::get_attributes()} is currently reserved for a future streaming * JSON parser class. * - {@see self::allocate_and_return_parsed_attributes()} extracts the JSON attributes * for delimiters which open blocks and return the fully-parsed attributes as an * associative array. {@see static::get_last_json_error()} for when this fails. * - {@see self::is_html()} indicates if the token is a span of HTML which might * be top-level freeform content or a block’s inner HTML. * - {@see self::get_html_content()} returns the span of HTML. * - {@see self::get_span()} for the byte offset and length into the input document * representing the token. * * It’s possible for the processor to fail to scan forward if the input document ends * in a proper prefix of an explicit block comment delimiter. For example, if the input * ends in `<!-- wp:` then it _might_ be the start of another delimiter. The parser * cannot know, however, and therefore refuses to proceed. {@see static::get_last_error()} * to distinguish between a failure to find the next token and an incomplete input. * * ### Block types * * A block’s “type” comprises an optional _namespace_ and _name_. If the namespace * isn’t provided it will be interpreted as the implicit `core` namespace. For example, * the type `gallery` is the name of the block in the `core` namespace, but the type * `abc/gallery` is the _fully-qualified_ block type for the block whose name is still * `gallery`, but in the `abc` namespace. * * Methods on this class are aware of this block naming semantic and anywhere a block * type is an argument to a method it will be normalized to account for implicit namespaces. * Passing `paragraph` is the same as passing `core/paragraph`. On the contrary, anywhere * this class returns a block type, it will return the fully-qualified and normalized form. * For example, for the `<!-- wp:group -->` delimiter it will return `core/group` as the * block type. * * There are two special block types that change the behavior of the processor: * * - The wildcard `*` represents _any block_. In addition to matching all block types, * it also represents top-level freeform HTML whose block type is reported as `null`. * * - The `core/freeform` block type is a pseudo-block type which explicitly matches * top-level freeform HTML. * * These special block types can be passed into any method which searches for blocks. * * There is one additional special block type which may be returned from * {@see self::get_printable_block_type()}. This is the `#innerHTML` type, which * indicates that the HTML span on which the processor is paused is inner HTML for * a containing block. * * ### Spans of HTML * * Non-block content plays a complicated role in processing block documents. This * processor exposes tools to help work with these spans of HTML. * * - {@see self::is_html()} indicates if the processor is paused at a span of * HTML but does not differentiate between top-level freeform content and inner HTML. * - {@see self::is_non_whitespace_html()} indicates not only if the processor * is paused at a span of HTML, but also whether that span incorporates more than * whitespace characters. Because block serialization often inserts newlines between * block comment delimiters, this is useful for distinguishing “real” freeform * content from purely aesthetic syntax. * - {@see self::is_block_type()} matches top-level freeform HTML content when * provided one of the special block types described above. * * ### Block structure * * As the processor traverses block delimiters it maintains a stack of which blocks are * open at the given place in the document where it’s paused. This stack represents the * block structure of a document and is used to determine where blocks end, which blocks * represent inner blocks, whether a span of HTML is top-level freeform content, and * more. Investigate the stack with {@see self::get_breadcrumbs()}, which returns an * array of block types starting at the outermost-open block and descending to the * currently-visited block. * * Unlike {@parse_blocks()}, spans of HTML appear in this structure as the special * reported block type `#html`. Such a span represents inner HTML for a block if the * depth reported by {@see self::get_depth()} is greater than one. * * It will generally not be necessary to inspect the stack of open blocks, though * depth may be important for finding where blocks end. When visiting a block opener, * the depth will have been increased before pausing; in contrast the depth is * decremented before visiting a closer. This makes the following an easy way to * determine if a block is still open. * * Example: * * $depth = $processor->get_depth(); * while ( $processor->next_token() && $processor->get_depth() > $depth ) { * continue * } * // Processor is now paused at the token immediately following the closed block. * * #### Extracting blocks * * A unique feature of this processor is the ability to return the same output as * {@see \parse_blocks()} would produce, but for a subset of the input document. * For example, it’s possible to extract an image block, manipulate that parsed * block, and re-serialize it into the original document. It’s possible to do so * while skipping over the parse of the rest of the document. * * {@see self::extract_full_block_and_advance()} will scan forward from the current block opener * and build the parsed block structure until the current block is closed. It will * include all inner HTML and inner blocks, and parse all of the inner blocks. It * can be used to extract a block at any depth in the document, helpful for operating * on blocks within nested structure. * * Example: * * if ( ! $processor->next_block( 'gallery' ) ) { * return $post_content; * } * * $gallery_at = $processor->get_span()->start; * $gallery_block = $processor->extract_full_block_and_advance(); * $after_gallery = $processor->get_span()->start; * return ( * substr( $post_content, 0, $gallery_at ) . * serialize_block( modify_gallery( $gallery_block ) . * substr( $post_content, $after_gallery ) * ); * * #### Handling of malformed structure * * There are situations where closing block delimiters appear for which no open block * exists, or where a document ends before a block is closed, or where a closing block * delimiter appears but references a different block type than the most-recently * opened block does. In all of these cases, the stack of open blocks should mirror * the behavior in {@see \parse_blocks()}. * * Unlike {@see \parse_blocks()}, however, this processor can still operate on the * invalid block delimiters. It provides a few functions which can be used for building * custom and non-spec-compliant error handling. * * - {@see self::has_closing_flag()} indicates if the block delimiter contains the * closing flag at the end. Some invalid block delimiters might contain both the * void and closing flag, in which case {@see self::get_delimiter_type()} will * report that it’s a void block. * - {@see static::get_last_error()} indicates if the processor reached an invalid * block closing. Depending on the context, {@see \parse_blocks()} might instead * ignore the token or treat it as freeform HTML content. * * ## Static helpers * * This class provides helpers for performing semantic block-related operations. * * - {@see self::normalize_block_type()} takes a block type with or without the * implicit `core` namespace and returns a fully-qualified block type. * - {@see self::are_equal_block_types()} indicates if two spans across one or * more input texts represent the same fully-qualified block type. * * ## Subclassing * * This processor is designed to accurately parse a block document. Therefore, many * of its methods are not meant for subclassing. However, overall this class supports * building higher-level convenience classes which may choose to subclass it. For those * classes, avoid re-implementing methods except for the list below. Instead, create * new names representing the higher-level concepts being introduced. For example, instead * of creating a new method named `next_block()` which only advances to blocks of a given * kind, consider creating a new method named something like `next_layout_block()` which * won’t interfere with the base class method. * * - {@see static::get_last_error()} may be reimplemented to report new errors in the subclass * which aren’t intrinsic to block parsing. * - {@see static::get_attributes()} may be reimplemented to provide a streaming interface * to reading and modifying a block’s JSON attributes. It should be fast and memory efficient. * - {@see static::get_last_json_error()} may be reimplemented to report new errors introduced * with a reimplementation of {@see static::get_attributes()}. * * @since 6.9.0 */ class WP_Block_Processor { /** * Indicates if the last operation failed, otherwise * will be `null` for success. * * @since 6.9.0 * * @var string|null */ private $last_error = null; /** * Indicates failures from decoding JSON attributes. * * @since 6.9.0 * * @see \json_last_error() * * @var int */ private $last_json_error = JSON_ERROR_NONE; /** * Source text provided to processor. * * @since 6.9.0 * * @var string */ protected $source_text; /** * Byte offset into source text where a matched delimiter starts. * * Example: * * 5 10 15 20 25 30 35 40 45 50 * <!-- wp:group --><!-- wp:void /--><!-- /wp:group --> * ╰─ Starts at byte offset 17. * * @since 6.9.0 * * @var int */ private $matched_delimiter_at = 0; /** * Byte length of full span of a matched delimiter. * * Example: * * 5 10 15 20 25 30 35 40 45 50 * <!-- wp:group --><!-- wp:void /--><!-- /wp:group --> * ╰───────────────╯ * 17 bytes long. * * @since 6.9.0 * * @var int */ private $matched_delimiter_length = 0; /** * First byte offset into source text following any previously-matched delimiter. * Used to indicate where an HTML span starts. * * Example: * * 5 10 15 20 25 30 35 40 45 50 55 * <!-- wp:paragraph --><p>Content</p><⃨!⃨-⃨-⃨ ⃨/⃨w⃨p⃨:⃨p⃨a⃨r⃨a⃨g⃨r⃨a⃨p⃨h⃨ ⃨-⃨-⃨>⃨ * │ ╰─ This delimiter was matched, and after matching, * │ revealed the preceding HTML span. * │ * ╰─ The first byte offset after the previous matched delimiter * is 21. Because the matched delimiter starts at 55, which is after * this, a span of HTML must exist between these boundaries. * * @since 6.9.0 * * @var int */ private $after_previous_delimiter = 0; /** * Byte offset where namespace span begins. * * When no namespace is present, this will be the same as the starting * byte offset for the block name. * * Example: * * <!-- wp:core/gallery --> * │ ╰─ Name starts here. * ╰─ Namespace starts here. * * <!-- wp:gallery --> * ├─ The namespace would start here but is implied as “core.” * ╰─ The name starts here. * * @since 6.9.0 * * @var int */ private $namespace_at = 0; /** * Byte offset where block name span begins. * * When no namespace is present, this will be the same as the starting * byte offset for the block namespace. * * Example: * * <!-- wp:core/gallery --> * │ ╰─ Name starts here. * ╰─ Namespace starts here. * * <!-- wp:gallery --> * ├─ The namespace would start here but is implied as “core.” * ╰─ The name starts here. * * @since 6.9.0 * * @var int */ private $name_at = 0; /** * Byte length of block name span. * * Example: * * 5 10 15 20 25 * <!-- wp:core/gallery --> * ╰─────╯ * 7 bytes long. * * @since 6.9.0 * * @var int */ private $name_length = 0; /** * Whether the delimiter contains the block-closing flag. * * This may be erroneous if present within a void block, * therefore the {@see self::has_closing_flag()} can be used by * calling code to perform custom error-handling. * * @since 6.9.0 * * @var bool */ private $has_closing_flag = false; /** * Byte offset where JSON attributes span begins. * * Example: * * 5 10 15 20 25 30 35 40 * <!-- wp:paragraph {"dropCaps":true} --> * ╰─ Starts at byte offset 18. * * @since 6.9.0 * * @var int */ private $json_at; /** * Byte length of JSON attributes span, or 0 if none are present. * * Example: * * 5 10 15 20 25 30 35 40 * <!-- wp:paragraph {"dropCaps":true} --> * ╰───────────────╯ * 17 bytes long. * * @since 6.9.0 * * @var int */ private $json_length = 0; /** * Internal parser state, differentiating whether the instance is currently matched, * on an implicit freeform node, in error, or ready to begin parsing. * * @see self::READY * @see self::MATCHED * @see self::HTML_SPAN * @see self::INCOMPLETE_INPUT * @see self::COMPLETE * * @since 6.9.0 * * @var string */ protected $state = self::READY; /** * Indicates what kind of block comment delimiter was matched. * * One of: * * - {@see self::OPENER} If the delimiter is opening a block. * - {@see self::CLOSER} If the delimiter is closing an open block. * - {@see self::VOID} If the delimiter represents a void block with no inner content. * * If a parsed comment delimiter contains both the closing and the void * flags then it will be interpreted as a void block to match the behavior * of the official block parser, however, this is a syntax error and probably * the block ought to close an open block of the same name, if one is open. * * @since 6.9.0 * * @var string */ private $type; /** * Whether the last-matched delimiter acts like a void block and should be * popped from the stack of open blocks as soon as the parser advances. * * This applies to void block delimiters and to HTML spans. * * @since 6.9.0 * * @var bool */ private $was_void = false; /** * For every open block, in hierarchical order, this stores the byte offset * into the source text where the block type starts, including for HTML spans. * * To avoid allocating and normalizing block names when they aren’t requested, * the stack of open blocks is stored as the byte offsets and byte lengths of * each open block’s block type. This allows for minimal tracking and quick * reading or comparison of block types when requested. * * @since 6.9.0 * * @see self::$open_blocks_length * * @var int[] */ private $open_blocks_at = array(); /** * For every open block, in hierarchical order, this stores the byte length * of the block’s block type in the source text. For HTML spans this is 0. * * @since 6.9.0 * * @see self::$open_blocks_at * * @var int[] */ private $open_blocks_length = array(); /** * Indicates which operation should apply to the stack of open blocks after * processing any pending spans of HTML. * * Since HTML spans are discovered after matching block delimiters, those * delimiters need to defer modifying the stack of open blocks. This value, * if set, indicates what operation should be applied. The properties * associated with token boundaries still point to the delimiters even * when processing HTML spans, so there’s no need to track them independently. * * @var 'push'|'void'|'pop'|null */ private $next_stack_op = null; /** * Creates a new block processor. * * Example: * * $processor = new WP_Block_Processor( $post_content ); * if ( $processor->next_block( 'core/image' ) ) { * echo "Found an image!\n"; * } * * @see self::next_block() to advance to the start of the next block (skips closers). * @see self::next_delimiter() to advance to the next explicit block delimiter. * @see self::next_token() to advance to the next block delimiter or HTML span. * * @since 6.9.0 * * @param string $source_text Input document potentially containing block content. */ public function __construct( string $source_text ) { $this->source_text = $source_text; } /** * Advance to the next block delimiter which opens a block, indicating if one was found. * * Delimiters which open blocks include opening and void block delimiters. To visit * freeform HTML content, pass the wildcard “*” as the block type. * * Use this function to walk through the blocks in a document, pausing where they open. * * Example blocks: * * // The first delimiter opens the paragraph block. * <⃨!⃨-⃨-⃨ ⃨w⃨p⃨:⃨p⃨a⃨r⃨a⃨g⃨r⃨a⃨p⃨h⃨ ⃨-⃨-⃨>⃨<p>Content</p><!-- /wp:paragraph--> * * // The void block is the first opener in this sequence of closers. * <!-- /wp:group --><⃨!⃨-⃨-⃨ ⃨w⃨p⃨:⃨s⃨p⃨a⃨c⃨e⃨r⃨ ⃨{⃨"⃨h⃨e⃨i⃨g⃨h⃨t⃨"⃨:⃨"⃨2⃨0⃨0⃨p⃨x⃨"⃨}⃨ ⃨/⃨-⃨-⃨>⃨<!-- /wp:group --> * * // If, however, `*` is provided as the block type, freeform content is matched. * <⃨h⃨2⃨>⃨M⃨y⃨ ⃨s⃨y⃨n⃨o⃨p⃨s⃨i⃨s⃨<⃨/⃨h⃨2⃨>⃨\⃨n⃨<!-- wp:my/table-of-contents /--> * * // Inner HTML is never freeform content, and will not be matched even with the wildcard. * <!-- /wp:list-item --></ul><!-- /wp:list --><⃨!⃨-⃨-⃨ ⃨w⃨p⃨:⃨p⃨a⃨r⃨a⃨g⃨r⃨a⃨p⃨h⃨ ⃨-⃨>⃨<p> * * Example: * * // Find all textual ranges of image block opening delimiters. * $images = array(); * $processor = new WP_Block_Processor( $html ); * while ( $processor->next_block( 'core/image' ) ) { * $images[] = $processor->get_span(); * } * * In some cases it may be useful to conditionally visit the implicit freeform * blocks, such as when determining if a post contains freeform content that * isn’t purely whitespace. * * Example: * * $seen_block_types = []; * $block_type = '*'; * $processor = new WP_Block_Processor( $html ); * while ( $processor->next_block( $block_type ) { * // Stop wasting time visiting freeform blocks after one has been found. * if ( * '*' === $block_type && * null === $processor->get_block_type() && * $processor->is_non_whitespace_html() * ) { * $block_type = null; * $seen_block_types['core/freeform'] = true; * continue; * } * * $seen_block_types[ $processor->get_block_type() ] = true; * } * * @since 6.9.0 * * @see self::next_delimiter() to advance to the next explicit block delimiter. * @see self::next_token() to advance to the next block delimiter or HTML span. * * @param string|null $block_type Optional. If provided, advance until a block of this type is found. * Default is to stop at any block regardless of its type. * @return bool Whether an opening delimiter for a block was found. */ public function next_block( ?string $block_type = null ): bool { while ( $this->next_delimiter( $block_type ) ) { if ( self::CLOSER !== $this->get_delimiter_type() ) { return true; } } return false; } /** * Advance to the next block delimiter in a document, indicating if one was found. * * Delimiters may include invalid JSON. This parser does not attempt to parse the * JSON attributes until requested; when invalid, the attributes will be null. This * matches the behavior of {@see \parse_blocks()}. To visit freeform HTML content, * pass the wildcard “*” as the block type. * * Use this function to walk through the block delimiters in a document. * * Example delimiters: * * <!-- wp:paragraph {"dropCap": true} --> * <!-- wp:separator /--> * <!-- /wp:paragraph --> * * // If the wildcard `*` is provided as the block type, freeform content is matched. * <⃨h⃨2⃨>⃨M⃨y⃨ ⃨s⃨y⃨n⃨o⃨p⃨s⃨i⃨s⃨<⃨/⃨h⃨2⃨>⃨\⃨n⃨<!-- wp:my/table-of-contents /--> * * // Inner HTML is never freeform content, and will not be matched even with the wildcard. * ...</ul><⃨!⃨-⃨-⃨ ⃨/⃨w⃨p⃨:⃨l⃨i⃨s⃨t⃨ ⃨-⃨-⃨>⃨<!-- wp:paragraph --><p> * * Example: * * $html = '<!-- wp:void /-->\n<!-- wp:void /-->'; * $processor = new WP_Block_Processor( $html ); * while ( $processor->next_delimiter() { * // Runs twice, seeing both void blocks of type “core/void.” * } * * $processor = new WP_Block_Processor( $html ); * while ( $processor->next_delimiter( '*' ) ) { * // Runs thrice, seeing the void block, the newline span, and the void block. * } * * @since 6.9.0 * * @param string|null $block_name Optional. Keep searching until a block of this name is found. * Defaults to visit every block regardless of type. * @return bool Whether a block delimiter was matched. */ public function next_delimiter( ?string $block_name = null ): bool { if ( ! isset( $block_name ) ) { while ( $this->next_token() ) { if ( ! $this->is_html() ) { return true; } } return false; } while ( $this->next_token() ) { if ( $this->is_block_type( $block_name ) ) { return true; } } return false; } /** * Advance to the next block delimiter or HTML span in a document, indicating if one was found. * * This function steps through every syntactic chunk in a document. This includes explicit * block comment delimiters, freeform non-block content, and inner HTML segments. * * Example tokens: * * <!-- wp:paragraph {"dropCap": true} --> * <!-- wp:separator /--> * <!-- /wp:paragraph --> * <p>Normal HTML content</p> * Plaintext content too! * * Example: * * // Find span containing wrapping HTML element surrounding inner blocks. * $processor = new WP_Block_Processor( $html ); * if ( ! $processor->next_block( 'gallery' ) ) { * return null; * } * * $containing_span = null; * while ( $processor->next_token() && $processor->is_html() ) { * $containing_span = $processor->get_span(); * } * * This method will visit all HTML spans including those forming freeform non-block * content as well as those which are part of a block’s inner HTML. * * @since 6.9.0 * * @return bool Whether a token was matched or the end of the document was reached without finding any. */ public function next_token(): bool { if ( $this->last_error || 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; } return array_any( $block_type, fn( $block ) => $this->is_block_type( $block ) ); } /** * 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 str_contains( $block_type, '/' ) ? $block_type : "core/{$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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