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/** * List of inner blocks (of this same class) * * @since 5.0.0 * @var WP_Block_Parser_Block[] */ public $innerBlocks; /** * Resultant HTML from inside block comment delimiters * after removing inner blocks * * @example "...Just testing..." -> "Just testing..." * * @since 5.0.0 * @var string */ public $innerHTML; /** * List of string fragments and null markers where inner blocks were found * * @example array( * 'innerHTML' => 'BeforeInnerAfter', * 'innerBlocks' => array( block, block ), * 'innerContent' => array( 'Before', null, 'Inner', null, 'After' ), * ) * * @since 4.2.0 * @var array */ public $innerContent; /** * Constructor. * * Will populate object properties from the provided arguments. * * @since 5.0.0 * * @param string $name Name of block. * @param array $attrs Optional set of attributes from block comment delimiters. * @param array $innerBlocks List of inner blocks (of this same class). * @param string $innerHTML Resultant HTML from inside block comment delimiters after removing inner blocks. * @param array $innerContent List of string fragments and null markers where inner blocks were found. */ function __construct( $name, $attrs, $innerBlocks, $innerHTML, $innerContent ) { $this->blockName = $name; $this->attrs = $attrs; $this->innerBlocks = $innerBlocks; $this->innerHTML = $innerHTML; $this->innerContent = $innerContent; } } /** * Class WP_Block_Parser_Frame * * Holds partial blocks in memory while parsing * * @internal * @since 5.0.0 */ class WP_Block_Parser_Frame { /** * Full or partial block * * @since 5.0.0 * @var WP_Block_Parser_Block */ public $block; /** * Byte offset into document for start of parse token * * @since 5.0.0 * @var int */ public $token_start; /** * Byte length of entire parse token string * * @since 5.0.0 * @var int */ public $token_length; /** * Byte offset into document for after parse token ends * (used during reconstruction of stack into parse production) * * @since 5.0.0 * @var int */ public $prev_offset; /** * Byte offset into document where leading HTML before token starts * * @since 5.0.0 * @var int */ public $leading_html_start; /** * Constructor * * Will populate object properties from the provided arguments. * * @since 5.0.0 * * @param WP_Block_Parser_Block $block Full or partial block. * @param int $token_start Byte offset into document for start of parse token. * @param int $token_length Byte length of entire parse token string. * @param int $prev_offset Byte offset into document for after parse token ends. * @param int $leading_html_start Byte offset into document where leading HTML before token starts. */ function __construct( $block, $token_start, $token_length, $prev_offset = null, $leading_html_start = null ) { $this->block = $block; $this->token_start = $token_start; $this->token_length = $token_length; $this->prev_offset = isset( $prev_offset ) ? $prev_offset : $token_start + $token_length; $this->leading_html_start = $leading_html_start; } } /** * Class WP_Block_Parser * * Parses a document and constructs a list of parsed block objects * * @since 5.0.0 * @since 4.0.0 returns arrays not objects, all attributes are arrays */ class WP_Block_Parser { /** * Input document being parsed * * @example "Pre-text\nThis is inside a block!" * * @since 5.0.0 * @var string */ public $document; /** * Tracks parsing progress through document * * @since 5.0.0 * @var int */ public $offset; /** * List of parsed blocks * * @since 5.0.0 * @var WP_Block_Parser_Block[] */ public $output; /** * Stack of partially-parsed structures in memory during parse * * @since 5.0.0 * @var WP_Block_Parser_Frame[] */ public $stack; /** * Empty associative array, here due to PHP quirks * * @since 4.4.0 * @var array empty associative array */ public $empty_attrs; /** * Parses a document and returns a list of block structures * * When encountering an invalid parse will return a best-effort * parse. In contrast to the specification parser this does not * return an error on invalid inputs. * * @since 5.0.0 * * @param string $document Input document being parsed. * @return WP_Block_Parser_Block[] */ function parse( $document ) { $this->document = $document; $this->offset = 0; $this->output = array(); $this->stack = array(); $this->empty_attrs = json_decode( '{}', true ); do { // twiddle our thumbs. } while ( $this->proceed() ); return $this->output; } /** * Processes the next token from the input document * and returns whether to proceed eating more tokens * * This is the "next step" function that essentially * takes a token as its input and decides what to do * with that token before descending deeper into a * nested block tree or continuing along the document * or breaking out of a level of nesting. * * @internal * @since 5.0.0 * @return bool */ function proceed() { $next_token = $this->next_token(); list( $token_type, $block_name, $attrs, $start_offset, $token_length ) = $next_token; $stack_depth = count( $this->stack ); // we may have some HTML soup before the next block. $leading_html_start = $start_offset > $this->offset ? $this->offset : null; switch ( $token_type ) { case 'no-more-tokens': // if not in a block then flush output. if ( 0 === $stack_depth ) { $this->add_freeform(); return false; } /* * Otherwise we have a problem * This is an error * * we have options * - treat it all as freeform text * - assume an implicit closer (easiest when not nesting) */ // for the easy case we'll assume an implicit closer. if ( 1 === $stack_depth ) { $this->add_block_from_stack(); return false; } /* * for the nested case where it's more difficult we'll * have to assume that multiple closers are missing * and so we'll collapse the whole stack piecewise */ while ( 0 < count( $this->stack ) ) { $this->add_block_from_stack(); } return false; case 'void-block': /* * easy case is if we stumbled upon a void block * in the top-level of the document */ if ( 0 === $stack_depth ) { if ( isset( $leading_html_start ) ) { $this->output[] = (array) $this->freeform( substr( $this->document, $leading_html_start, $start_offset - $leading_html_start ) ); } $this->output[] = (array) new WP_Block_Parser_Block( $block_name, $attrs, array(), '', array() ); $this->offset = $start_offset + $token_length; return true; } // otherwise we found an inner block. $this->add_inner_block( new WP_Block_Parser_Block( $block_name, $attrs, array(), '', array() ), $start_offset, $token_length ); $this->offset = $start_offset + $token_length; return true; case 'block-opener': // track all newly-opened blocks on the stack. array_push( $this->stack, new WP_Block_Parser_Frame( new WP_Block_Parser_Block( $block_name, $attrs, array(), '', array() ), $start_offset, $token_length, $start_offset + $token_length, $leading_html_start ) ); $this->offset = $start_offset + $token_length; return true; case 'block-closer': /* * if we're missing an opener we're in trouble * This is an error */ if ( 0 === $stack_depth ) { /* * we have options * - assume an implicit opener * - assume _this_ is the opener * - give up and close out the document */ $this->add_freeform(); return false; } // if we're not nesting then this is easy - close the block. if ( 1 === $stack_depth ) { $this->add_block_from_stack( $start_offset ); $this->offset = $start_offset + $token_length; return true; } /* * otherwise we're nested and we have to close out the current * block and add it as a new innerBlock to the parent */ $stack_top = array_pop( $this->stack ); $html = substr( $this->document, $stack_top->prev_offset, $start_offset - $stack_top->prev_offset ); $stack_top->block->innerHTML .= $html; $stack_top->block->innerContent[] = $html; $stack_top->prev_offset = $start_offset + $token_length; $this->add_inner_block( $stack_top->block, $stack_top->token_start, $stack_top->token_length, $start_offset + $token_length ); $this->offset = $start_offset + $token_length; return true; default: // This is an error. $this->add_freeform(); return false; } } /** * Scans the document from where we last left off * and finds the next valid token to parse if it exists * * Returns the type of the find: kind of find, block information, attributes * * @internal * @since 5.0.0 * @since 4.6.1 fixed a bug in attribute parsing which caused catastrophic backtracking on invalid block comments * @return array */ function next_token() { $matches = null; /* * aye the magic * we're using a single RegExp to tokenize the block comment delimiters * we're also using a trick here because the only difference between a * block opener and a block closer is the leading `/` before `wp:` (and * a closer has no attributes). we can trap them both and process the * match back in PHP to see which one it was. */ $has_match = preg_match( '/).)*+)?}\s+)?(?P\/)?-->/s', $this->document, $matches, PREG_OFFSET_CAPTURE, $this->offset ); // if we get here we probably have catastrophic backtracking or out-of-memory in the PCRE. if ( false === $has_match ) { return array( 'no-more-tokens', null, null, null, null ); } // we have no more tokens. if ( 0 === $has_match ) { return array( 'no-more-tokens', null, null, null, null ); } list( $match, $started_at ) = $matches[0]; $length = strlen( $match ); $is_closer = isset( $matches['closer'] ) && -1 !== $matches['closer'][1]; $is_void = isset( $matches['void'] ) && -1 !== $matches['void'][1]; $namespace = $matches['namespace']; $namespace = ( isset( $namespace ) && -1 !== $namespace[1] ) ? $namespace[0] : 'core/'; $name = $namespace . $matches['name'][0]; $has_attrs = isset( $matches['attrs'] ) && -1 !== $matches['attrs'][1]; /* * Fun fact! It's not trivial in PHP to create "an empty associative array" since all arrays * are associative arrays. If we use `array()` we get a JSON `[]` */ $attrs = $has_attrs ? json_decode( $matches['attrs'][0], /* as-associative */ true ) : $this->empty_attrs; /* * This state isn't allowed * This is an error */ if ( $is_closer && ( $is_void || $has_attrs ) ) { // we can ignore them since they don't hurt anything. } if ( $is_void ) { return array( 'void-block', $name, $attrs, $started_at, $length ); } if ( $is_closer ) { return array( 'block-closer', $name, null, $started_at, $length ); } return array( 'block-opener', $name, $attrs, $started_at, $length ); } /** * Returns a new block object for freeform HTML * * @internal * @since 3.9.0 * * @param string $innerHTML HTML content of block. * @return WP_Block_Parser_Block freeform block object. */ function freeform( $innerHTML ) { return new WP_Block_Parser_Block( null, $this->empty_attrs, array(), $innerHTML, array( $innerHTML ) ); } /** * Pushes a length of text from the input document * to the output list as a freeform block. * * @internal * @since 5.0.0 * @param null $length how many bytes of document text to output. */ function add_freeform( $length = null ) { $length = $length ? $length : strlen( $this->document ) - $this->offset; if ( 0 === $length ) { return; } $this->output[] = (array) $this->freeform( substr( $this->document, $this->offset, $length ) ); } /** * Given a block structure from memory pushes * a new block to the output list. * * @internal * @since 5.0.0 * @param WP_Block_Parser_Block $block The block to add to the output. * @param int $token_start Byte offset into the document where the first token for the block starts. * @param int $token_length Byte length of entire block from start of opening token to end of closing token. * @param int|null $last_offset Last byte offset into document if continuing form earlier output. */ function add_inner_block( WP_Block_Parser_Block $block, $token_start, $token_length, $last_offset = null ) { $parent = $this->stack[ count( $this->stack ) - 1 ]; $parent->block->innerBlocks[] = (array) $block; $html = substr( $this->document, $parent->prev_offset, $token_start - $parent->prev_offset ); if ( ! empty( $html ) ) { $parent->block->innerHTML .= $html; $parent->block->innerContent[] = $html; } $parent->block->innerContent[] = null; $parent->prev_offset = $last_offset ? $last_offset : $token_start + $token_length; } /** * Pushes the top block from the parsing stack to the output list. * * @internal * @since 5.0.0 * @param int|null $end_offset byte offset into document for where we should stop sending text output as HTML. */ function add_block_from_stack( $end_offset = null ) { $stack_top = array_pop( $this->stack ); $prev_offset = $stack_top->prev_offset; $html = isset( $end_offset ) ? substr( $this->document, $prev_offset, $end_offset - $prev_offset ) : substr( $this->document, $prev_offset ); if ( ! empty( $html ) ) { $stack_top->block->innerHTML .= $html; $stack_top->block->innerContent[] = $html; } if ( isset( $stack_top->leading_html_start ) ) { $this->output[] = (array) $this->freeform( substr( $this->document, $stack_top->leading_html_start, $stack_top->token_start - $stack_top->leading_html_start ) ); } $this->output[] = (array) $stack_top->block; } }