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Edit File : class-wp-block-parser.php \| Size : 14.86 KB
<?php /** * Block Serialization Parser * * @package WordPress / /* * Class WP_Block_Parser_Block * * Holds the block structure in memory * * @since 3.8.0 / class WP_Block_Parser_Block { /* * Name of block * * @example "core/paragraph" * * @since 3.8.0 * @var string / public $blockName; /* * Optional set of attributes from block comment delimiters * * @example null * @example array( 'columns' => 3 ) * * @since 3.8.0 * @var array\|null / public $attrs; /* * List of inner blocks (of this same class) * * @since 3.8.0 * @var WP_Block_Parser_Block[] / public $innerBlocks; /* * Resultant HTML from inside block comment delimiters * after removing inner blocks * * @example "...Just <!-- wp:test /--> testing..." -> "Just testing..." * * @since 3.8.0 * @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 3.8.0 * * @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 3.8.0 / class WP_Block_Parser_Frame { /* * Full or partial block * * @since 3.8.0 * @var WP_Block_Parser_Block / public $block; /* * Byte offset into document for start of parse token * * @since 3.8.0 * @var int / public $token_start; /* * Byte length of entire parse token string * * @since 3.8.0 * @var int / public $token_length; /* * Byte offset into document for after parse token ends * (used during reconstruction of stack into parse production) * * @since 3.8.0 * @var int / public $prev_offset; /* * Byte offset into document where leading HTML before token starts * * @since 3.8.0 * @var int / public $leading_html_start; /* * Constructor * * Will populate object properties from the provided arguments. * * @since 3.8.0 * * @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 3.8.0 * @since 4.0.0 returns arrays not objects, all attributes are arrays / class WP_Block_Parser { /* * Input document being parsed * * @example "Pre-text\n<!-- wp:paragraph -->This is inside a block!<!-- /wp:paragraph -->" * * @since 3.8.0 * @var string / public $document; /* * Tracks parsing progress through document * * @since 3.8.0 * @var int / public $offset; /* * List of parsed blocks * * @since 3.8.0 * @var WP_Block_Parser_Block[] / public $output; /* * Stack of partially-parsed structures in memory during parse * * @since 3.8.0 * @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 3.8.0 * * @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 3.8.0 * @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) self::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 3.8.0 * @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<closer>\/)?[ws]p:(?P<namespace>[a-z][a-z0-9_-]\/)?(?P<name>[a-z][a-z0-9_-])\s+(?P<attrs>{(?:(?:[^}]+\|}+(?=})\|(?!}\s+\/?-->).)+)?}\s+)?(?P<void>\/)?-->/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 3.8.0 * @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) self::freeform( substr( $this->document, $this->offset, $length ) ); } /* * Given a block structure from memory pushes * a new block to the output list. * * @internal * @since 3.8.0 * @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 3.8.0 * @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) self::freeform( substr( $this->document, $stack_top->leading_html_start, $stack_top->token_start - $stack_top->leading_html_start ) ); } $this->output[] = (array) $stack_top->block; } } Back

Edit File : class-wp-block-parser.php | Size : 14.86 KB

<?php
/**
 * Block Serialization Parser
 *
 * @package WordPress
 */

/**
 * Class WP_Block_Parser_Block
 *
 * Holds the block structure in memory
 *
 * @since 3.8.0
 */
class WP_Block_Parser_Block {
	/**
	 * Name of block
	 *
	 * @example "core/paragraph"
	 *
	 * @since 3.8.0
	 * @var string
	 */
	public $blockName;

/**
	 * Optional set of attributes from block comment delimiters
	 *
	 * @example null
	 * @example array( 'columns' => 3 )
	 *
	 * @since 3.8.0
	 * @var array|null
	 */
	public $attrs;

/**
	 * List of inner blocks (of this same class)
	 *
	 * @since 3.8.0
	 * @var WP_Block_Parser_Block[]
	 */
	public $innerBlocks;

/**
	 * Resultant HTML from inside block comment delimiters
	 * after removing inner blocks
	 *
	 * @example "...Just  testing..." -> "Just testing..."
	 *
	 * @since 3.8.0
	 * @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 3.8.0
	 *
	 * @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 3.8.0
 */
class WP_Block_Parser_Frame {
	/**
	 * Full or partial block
	 *
	 * @since 3.8.0
	 * @var WP_Block_Parser_Block
	 */
	public $block;

/**
	 * Byte offset into document for start of parse token
	 *
	 * @since 3.8.0
	 * @var int
	 */
	public $token_start;

/**
	 * Byte length of entire parse token string
	 *
	 * @since 3.8.0
	 * @var int
	 */
	public $token_length;

/**
	 * Byte offset into document for after parse token ends
	 * (used during reconstruction of stack into parse production)
	 *
	 * @since 3.8.0
	 * @var int
	 */
	public $prev_offset;

/**
	 * Byte offset into document where leading HTML before token starts
	 *
	 * @since 3.8.0
	 * @var int
	 */
	public $leading_html_start;

/**
	 * Constructor
	 *
	 * Will populate object properties from the provided arguments.
	 *
	 * @since 3.8.0
	 *
	 * @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 3.8.0
 * @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 3.8.0
	 * @var string
	 */
	public $document;

/**
	 * Tracks parsing progress through document
	 *
	 * @since 3.8.0
	 * @var int
	 */
	public $offset;

/**
	 * List of parsed blocks
	 *
	 * @since 3.8.0
	 * @var WP_Block_Parser_Block[]
	 */
	public $output;

/**
	 * Stack of partially-parsed structures in memory during parse
	 *
	 * @since 3.8.0
	 * @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 3.8.0
	 *
	 * @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 3.8.0
	 * @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) self::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 3.8.0
	 * @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<void>\/)?-->/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 3.8.0
	 * @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) self::freeform( substr( $this->document, $this->offset, $length ) );
	}

/**
	 * Given a block structure from memory pushes
	 * a new block to the output list.
	 *
	 * @internal
	 * @since 3.8.0
	 * @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 3.8.0
	 * @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) self::freeform(
				substr(
					$this->document,
					$stack_top->leading_html_start,
					$stack_top->token_start - $stack_top->leading_html_start
				)
			);
		}

$this->output[] = (array) $stack_top->block;
	}
}

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