<?php
/**
 * Blocks API: WP_Block_List class
 *
 * @package WordPress
 * @since 5.5.0
 */

/**
 * Class representing a list of block instances.
 *
 * @since 5.5.0
 */
class WP_Block_List implements Iterator, ArrayAccess, Countable {

	/**
	 * Original array of parsed block data, or block instances.
	 *
	 * @since 5.5.0
	 * @var array[]|WP_Block[]
	 * @access protected
	 */
	protected $blocks;

	/**
	 * All available context of the current hierarchy.
	 *
	 * @since 5.5.0
	 * @var array
	 * @access protected
	 */
	protected $available_context;

	/**
	 * Block type registry to use in constructing block instances.
	 *
	 * @since 5.5.0
	 * @var WP_Block_Type_Registry
	 * @access protected
	 */
	protected $registry;

	/**
	 * Constructor.
	 *
	 * Populates object properties from the provided block instance argument.
	 *
	 * @since 5.5.0
	 *
	 * @param array[]|WP_Block[]     $blocks            Array of parsed block data, or block instances.
	 * @param array                  $available_context Optional array of ancestry context values.
	 * @param WP_Block_Type_Registry $registry          Optional block type registry.
	 */
	public function __construct( $blocks, $available_context = array(), $registry = null ) {
		if ( ! $registry instanceof WP_Block_Type_Registry ) {
			$registry = WP_Block_Type_Registry::get_instance();
		}

		$this->blocks            = $blocks;
		$this->available_context = $available_context;
		$this->registry          = $registry;
	}

	/**
	 * Returns true if a block exists by the specified block index, or false
	 * otherwise.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/arrayaccess.offsetexists.php
	 *
	 * @param string $index Index of block to check.
	 * @return bool Whether block exists.
	 */
	public function offsetExists( $index ) {
		return isset( $this->blocks[ $index ] );
	}

	/**
	 * Returns the value by the specified block index.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/arrayaccess.offsetget.php
	 *
	 * @param string $index Index of block value to retrieve.
	 * @return mixed|null Block value if exists, or null.
	 */
	public function offsetGet( $index ) {
		$block = $this->blocks[ $index ];

		if ( isset( $block ) && is_array( $block ) ) {
			$block                  = new WP_Block( $block, $this->available_context, $this->registry );
			$this->blocks[ $index ] = $block;
		}

		return $block;
	}

	/**
	 * Assign a block value by the specified block index.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/arrayaccess.offsetset.php
	 *
	 * @param string $index Index of block value to set.
	 * @param mixed  $value Block value.
	 */
	public function offsetSet( $index, $value ) {
		if ( is_null( $index ) ) {
			$this->blocks[] = $value;
		} else {
			$this->blocks[ $index ] = $value;
		}
	}

	/**
	 * Unset a block.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/arrayaccess.offsetunset.php
	 *
	 * @param string $index Index of block value to unset.
	 */
	public function offsetUnset( $index ) {
		unset( $this->blocks[ $index ] );
	}

	/**
	 * Rewinds back to the first element of the Iterator.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/iterator.rewind.php
	 */
	public function rewind() {
		reset( $this->blocks );
	}

	/**
	 * Returns the current element of the block list.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/iterator.current.php
	 *
	 * @return mixed Current element.
	 */
	public function current() {
		return $this->offsetGet( $this->key() );
	}

	/**
	 * Returns the key of the current element of the block list.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/iterator.key.php
	 *
	 * @return mixed Key of the current element.
	 */
	public function key() {
		return key( $this->blocks );
	}

	/**
	 * Moves the current position of the block list to the next element.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/iterator.next.php
	 */
	public function next() {
		next( $this->blocks );
	}

	/**
	 * Checks if current position is valid.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/iterator.valid.php
	 */
	public function valid() {
		return null !== key( $this->blocks );
	}

	/**
	 * Returns the count of blocks in the list.
	 *
	 * @since 5.5.0
	 *
	 * @link https://www.php.net/manual/en/countable.count.php
	 *
	 * @return int Block count.
	 */
	public function count() {
		return count( $this->blocks );
	}

}


<?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>\/)?wp:(?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;
	}
}


<?php
/**
 * Blocks API: WP_Block_Pattern_Categories_Registry class
 *
 * @package WordPress
 * @subpackage Blocks
 * @since 5.5.0
 */

/**
 * Class used for interacting with block pattern categories.
 */
final class WP_Block_Pattern_Categories_Registry {
	/**
	 * Registered block pattern categories array.
	 *
	 * @var array
	 */
	private $registered_categories = array();

	/**
	 * Container for the main instance of the class.
	 *
	 * @var WP_Block_Pattern_Categories_Registry|null
	 */
	private static $instance = null;

	/**
	 * Registers a pattern category.
	 *
	 * @since 5.5.0
	 *
	 * @param string $category_name       Pattern category name.
	 * @param array  $category_properties Array containing the properties of the category: label.
	 * @return bool True if the pattern was registered with success and false otherwise.
	 */
	public function register( $category_name, $category_properties ) {
		if ( ! isset( $category_name ) || ! is_string( $category_name ) ) {
			_doing_it_wrong( __METHOD__, __( 'Block pattern category name must be a string.' ), '5.5.0' );
			return false;
		}

		$this->registered_categories[ $category_name ] = array_merge(
			array( 'name' => $category_name ),
			$category_properties
		);

		return true;
	}

	/**
	 * Unregisters a pattern category.
	 *
	 * @since 5.5.0
	 *
	 * @param string $category_name     Pattern name including namespace.
	 * @return bool True if the pattern was unregistered with success and false otherwise.
	 */
	public function unregister( $category_name ) {
		if ( ! $this->is_registered( $category_name ) ) {
			/* translators: 1: Block pattern name. */
			$message = sprintf( __( 'Block pattern category "%1$s" not found.' ), $category_name );
			_doing_it_wrong( __METHOD__, $message, '5.5.0' );
			return false;
		}

		unset( $this->registered_categories[ $category_name ] );

		return true;
	}

	/**
	 * Retrieves an array containing the properties of a registered pattern category.
	 *
	 * @since 5.5.0
	 *
	 * @param string $category_name Pattern category name.
	 * @return array Registered pattern properties.
	 */
	public function get_registered( $category_name ) {
		if ( ! $this->is_registered( $category_name ) ) {
			return null;
		}

		return $this->registered_categories[ $category_name ];
	}

	/**
	 * Retrieves all registered pattern categories.
	 *
	 * @since 5.5.0
	 *
	 * @return array Array of arrays containing the registered pattern categories properties.
	 */
	public function get_all_registered() {
		return array_values( $this->registered_categories );
	}

	/**
	 * Checks if a pattern category is registered.
	 *
	 * @since 5.5.0
	 *
	 * @param string $category_name       Pattern category name.
	 * @return bool True if the pattern category is registered, false otherwise.
	 */
	public function is_registered( $category_name ) {
		return isset( $this->registered_categories[ $category_name ] );
	}

	/**
	 * Utility method to retrieve the main instance of the class.
	 *
	 * The instance will be created if it does not exist yet.
	 *
	 * @since 5.5.0
	 *
	 * @return WP_Block_Pattern_Categories_Registry The main instance.
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}
}

/**
 * Registers a new pattern category.
 *
 * @since 5.5.0
 *
 * @param string $category_name       Pattern category name.
 * @param array  $category_properties Array containing the properties of the category.
 * @return bool True if the pattern category was registered with success and false otherwise.
 */
function register_block_pattern_category( $category_name, $category_properties ) {
	return WP_Block_Pattern_Categories_Registry::get_instance()->register( $category_name, $category_properties );
}

/**
 * Unregisters a pattern category.
 *
 * @since 5.5.0
 *
 * @param string $category_name       Pattern category name including namespace.
 * @return bool True if the pattern category was unregistered with success and false otherwise.
 */
function unregister_block_pattern_category( $category_name ) {
	return WP_Block_Pattern_Categories_Registry::get_instance()->unregister( $category_name );
}


<?php
/**
 * Blocks API: WP_Block_Patterns_Registry class
 *
 * @package WordPress
 * @subpackage Blocks
 * @since 5.5.0
 */

/**
 * Class used for interacting with patterns.
 *
 * @since 5.5.0
 */
final class WP_Block_Patterns_Registry {
	/**
	 * Registered patterns array.
	 *
	 * @var array
	 */
	private $registered_patterns = array();

	/**
	 * Container for the main instance of the class.
	 *
	 * @var WP_Block_Patterns_Registry|null
	 */
	private static $instance = null;

	/**
	 * Registers a pattern.
	 *
	 * @since 5.5.0
	 *
	 * @param string $pattern_name       Pattern name including namespace.
	 * @param array  $pattern_properties Array containing the properties of the pattern: title,
	 *                                   content, description, viewportWidth, categories, keywords.
	 * @return bool True if the pattern was registered with success and false otherwise.
	 */
	public function register( $pattern_name, $pattern_properties ) {
		if ( ! isset( $pattern_name ) || ! is_string( $pattern_name ) ) {
			_doing_it_wrong( __METHOD__, __( 'Pattern name must be a string.' ), '5.5.0' );
			return false;
		}

		if ( ! isset( $pattern_properties['title'] ) || ! is_string( $pattern_properties['title'] ) ) {
			_doing_it_wrong( __METHOD__, __( 'Pattern title must be a string.' ), '5.5.0' );
			return false;
		}

		if ( ! isset( $pattern_properties['content'] ) || ! is_string( $pattern_properties['content'] ) ) {
			_doing_it_wrong( __METHOD__, __( 'Pattern content must be a string.' ), '5.5.0' );
			return false;
		}

		$this->registered_patterns[ $pattern_name ] = array_merge(
			$pattern_properties,
			array( 'name' => $pattern_name )
		);

		return true;
	}

	/**
	 * Unregisters a pattern.
	 *
	 * @since 5.5.0
	 *
	 * @param string $pattern_name Pattern name including namespace.
	 * @return bool True if the pattern was unregistered with success and false otherwise.
	 */
	public function unregister( $pattern_name ) {
		if ( ! $this->is_registered( $pattern_name ) ) {
			/* translators: 1: Pattern name. */
			$message = sprintf( __( 'Pattern "%1$s" not found.' ), $pattern_name );
			_doing_it_wrong( __METHOD__, $message, '5.5.0' );
			return false;
		}

		unset( $this->registered_patterns[ $pattern_name ] );

		return true;
	}

	/**
	 * Retrieves an array containing the properties of a registered pattern.
	 *
	 * @since 5.5.0
	 *
	 * @param string $pattern_name Pattern name including namespace.
	 * @return array Registered pattern properties.
	 */
	public function get_registered( $pattern_name ) {
		if ( ! $this->is_registered( $pattern_name ) ) {
			return null;
		}

		return $this->registered_patterns[ $pattern_name ];
	}

	/**
	 * Retrieves all registered patterns.
	 *
	 * @since 5.5.0
	 *
	 * @return array Array of arrays containing the registered patterns properties,
	 *               and per style.
	 */
	public function get_all_registered() {
		return array_values( $this->registered_patterns );
	}

	/**
	 * Checks if a pattern is registered.
	 *
	 * @since 5.5.0
	 *
	 * @param string $pattern_name Pattern name including namespace.
	 * @return bool True if the pattern is registered, false otherwise.
	 */
	public function is_registered( $pattern_name ) {
		return isset( $this->registered_patterns[ $pattern_name ] );
	}

	/**
	 * Utility method to retrieve the main instance of the class.
	 *
	 * The instance will be created if it does not exist yet.
	 *
	 * @since 5.5.0
	 *
	 * @return WP_Block_Patterns_Registry The main instance.
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}
}

/**
 * Registers a new pattern.
 *
 * @since 5.5.0
 *
 * @param string $pattern_name       Pattern name including namespace.
 * @param array  $pattern_properties Array containing the properties of the pattern.
 * @return bool True if the pattern was registered with success and false otherwise.
 */
function register_block_pattern( $pattern_name, $pattern_properties ) {
	return WP_Block_Patterns_Registry::get_instance()->register( $pattern_name, $pattern_properties );
}

/**
 * Unregisters a pattern.
 *
 * @since 5.5.0
 *
 * @param string $pattern_name       Pattern name including namespace.
 * @return bool True if the pattern was unregistered with success and false otherwise.
 */
function unregister_block_pattern( $pattern_name ) {
	return WP_Block_Patterns_Registry::get_instance()->unregister( $pattern_name );
}


<?php
/**
 * Blocks API: WP_Block_Styles_Registry class
 *
 * @package WordPress
 * @subpackage Blocks
 * @since 5.3.0
 */

/**
 * Class used for interacting with block styles.
 *
 * @since 5.3.0
 */
final class WP_Block_Styles_Registry {
	/**
	 * Registered block styles, as `$block_name => $block_style_name => $block_style_properties` multidimensional arrays.
	 *
	 * @since 5.3.0
	 * @var array
	 */
	private $registered_block_styles = array();

	/**
	 * Container for the main instance of the class.
	 *
	 * @since 5.3.0
	 * @var WP_Block_Styles_Registry|null
	 */
	private static $instance = null;

	/**
	 * Registers a block style.
	 *
	 * @since 5.3.0
	 *
	 * @param string $block_name       Block type name including namespace.
	 * @param array  $style_properties Array containing the properties of the style name, label,
	 *                                 style (name of the stylesheet to be enqueued),
	 *                                 inline_style (string containing the CSS to be added).
	 * @return boolean True if the block style was registered with success and false otherwise.
	 */
	public function register( $block_name, $style_properties ) {

		if ( ! isset( $block_name ) || ! is_string( $block_name ) ) {
			$message = __( 'Block name must be a string.' );
			_doing_it_wrong( __METHOD__, $message, '5.3.0' );
			return false;
		}

		if ( ! isset( $style_properties['name'] ) || ! is_string( $style_properties['name'] ) ) {
			$message = __( 'Block style name must be a string.' );
			_doing_it_wrong( __METHOD__, $message, '5.3.0' );
			return false;
		}

		$block_style_name = $style_properties['name'];

		if ( ! isset( $this->registered_block_styles[ $block_name ] ) ) {
			$this->registered_block_styles[ $block_name ] = array();
		}
		$this->registered_block_styles[ $block_name ][ $block_style_name ] = $style_properties;

		return true;
	}

	/**
	 * Unregisters a block style.
	 *
	 * @param string $block_name       Block type name including namespace.
	 * @param string $block_style_name Block style name.
	 * @return boolean True if the block style was unregistered with success and false otherwise.
	 */
	public function unregister( $block_name, $block_style_name ) {
		if ( ! $this->is_registered( $block_name, $block_style_name ) ) {
			/* translators: 1: Block name, 2: Block style name. */
			$message = sprintf( __( 'Block "%1$s" does not contain a style named "%2$s".' ), $block_name, $block_style_name );
			_doing_it_wrong( __METHOD__, $message, '5.3.0' );
			return false;
		}

		unset( $this->registered_block_styles[ $block_name ][ $block_style_name ] );

		return true;
	}

	/**
	 * Retrieves an array containing the properties of a registered block style.
	 *
	 * @since 5.3.0
	 *
	 * @param string $block_name       Block type name including namespace.
	 * @param string $block_style_name Block style name.
	 * @return array Registered block style properties.
	 */
	public function get_registered( $block_name, $block_style_name ) {
		if ( ! $this->is_registered( $block_name, $block_style_name ) ) {
			return null;
		}

		return $this->registered_block_styles[ $block_name ][ $block_style_name ];
	}

	/**
	 * Retrieves all registered block styles.
	 *
	 * @since 5.3.0
	 *
	 * @return array Array of arrays containing the registered block styles properties grouped per block,
	 *               and per style.
	 */
	public function get_all_registered() {
		return $this->registered_block_styles;
	}

	/**
	 * Retrieves registered block styles for a specific block.
	 *
	 * @since 5.3.0
	 *
	 * @param string $block_name Block type name including namespace.
	 * @return array Array whose keys are block style names and whose value are block style properties.
	 */
	public function get_registered_styles_for_block( $block_name ) {
		if ( isset( $this->registered_block_styles[ $block_name ] ) ) {
			return $this->registered_block_styles[ $block_name ];
		}
		return array();
	}

	/**
	 * Checks if a block style is registered.
	 *
	 * @since 5.3.0
	 *
	 * @param string $block_name       Block type name including namespace.
	 * @param string $block_style_name Block style name.
	 * @return bool True if the block style is registered, false otherwise.
	 */
	public function is_registered( $block_name, $block_style_name ) {
		return isset( $this->registered_block_styles[ $block_name ][ $block_style_name ] );
	}

	/**
	 * Utility method to retrieve the main instance of the class.
	 *
	 * The instance will be created if it does not exist yet.
	 *
	 * @since 5.3.0
	 *
	 * @return WP_Block_Styles_Registry The main instance.
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}
}


<?php
/**
 * Blocks API: WP_Block_Type_Registry class
 *
 * @package WordPress
 * @subpackage Blocks
 * @since 5.0.0
 */

/**
 * Core class used for interacting with block types.
 *
 * @since 5.0.0
 */
final class WP_Block_Type_Registry {
	/**
	 * Registered block types, as `$name => $instance` pairs.
	 *
	 * @since 5.0.0
	 * @var WP_Block_Type[]
	 */
	private $registered_block_types = array();

	/**
	 * Container for the main instance of the class.
	 *
	 * @since 5.0.0
	 * @var WP_Block_Type_Registry|null
	 */
	private static $instance = null;

	/**
	 * Registers a block type.
	 *
	 * @since 5.0.0
	 *
	 * @param string|WP_Block_Type $name Block type name including namespace, or alternatively
	 *                                   a complete WP_Block_Type instance. In case a WP_Block_Type
	 *                                   is provided, the $args parameter will be ignored.
	 * @param array                $args {
	 *     Optional. Array of block type arguments. Accepts any public property of `WP_Block_Type`.
	 *     Any arguments may be defined, however the ones described below are supported by default.
	 *     Default empty array.
	 *
	 *     @type callable $render_callback Callback used to render blocks of this block type.
	 *     @type array    $attributes      Block attributes mapping, property name to schema.
	 * }
	 * @return WP_Block_Type|false The registered block type on success, or false on failure.
	 */
	public function register( $name, $args = array() ) {
		$block_type = null;
		if ( $name instanceof WP_Block_Type ) {
			$block_type = $name;
			$name       = $block_type->name;
		}

		if ( ! is_string( $name ) ) {
			$message = __( 'Block type names must be strings.' );
			_doing_it_wrong( __METHOD__, $message, '5.0.0' );
			return false;
		}

		if ( preg_match( '/[A-Z]+/', $name ) ) {
			$message = __( 'Block type names must not contain uppercase characters.' );
			_doing_it_wrong( __METHOD__, $message, '5.0.0' );
			return false;
		}

		$name_matcher = '/^[a-z0-9-]+\/[a-z0-9-]+$/';
		if ( ! preg_match( $name_matcher, $name ) ) {
			$message = __( 'Block type names must contain a namespace prefix. Example: my-plugin/my-custom-block-type' );
			_doing_it_wrong( __METHOD__, $message, '5.0.0' );
			return false;
		}

		if ( $this->is_registered( $name ) ) {
			/* translators: %s: Block name. */
			$message = sprintf( __( 'Block type "%s" is already registered.' ), $name );
			_doing_it_wrong( __METHOD__, $message, '5.0.0' );
			return false;
		}

		if ( ! $block_type ) {
			$block_type = new WP_Block_Type( $name, $args );
		}

		$this->registered_block_types[ $name ] = $block_type;

		return $block_type;
	}

	/**
	 * Unregisters a block type.
	 *
	 * @since 5.0.0
	 *
	 * @param string|WP_Block_Type $name Block type name including namespace, or alternatively
	 *                                   a complete WP_Block_Type instance.
	 * @return WP_Block_Type|false The unregistered block type on success, or false on failure.
	 */
	public function unregister( $name ) {
		if ( $name instanceof WP_Block_Type ) {
			$name = $name->name;
		}

		if ( ! $this->is_registered( $name ) ) {
			/* translators: %s: Block name. */
			$message = sprintf( __( 'Block type "%s" is not registered.' ), $name );
			_doing_it_wrong( __METHOD__, $message, '5.0.0' );
			return false;
		}

		$unregistered_block_type = $this->registered_block_types[ $name ];
		unset( $this->registered_block_types[ $name ] );

		return $unregistered_block_type;
	}

	/**
	 * Retrieves a registered block type.
	 *
	 * @since 5.0.0
	 *
	 * @param string $name Block type name including namespace.
	 * @return WP_Block_Type|null The registered block type, or null if it is not registered.
	 */
	public function get_registered( $name ) {
		if ( ! $this->is_registered( $name ) ) {
			return null;
		}

		return $this->registered_block_types[ $name ];
	}

	/**
	 * Retrieves all registered block types.
	 *
	 * @since 5.0.0
	 *
	 * @return WP_Block_Type[] Associative array of `$block_type_name => $block_type` pairs.
	 */
	public function get_all_registered() {
		return $this->registered_block_types;
	}

	/**
	 * Checks if a block type is registered.
	 *
	 * @since 5.0.0
	 *
	 * @param string $name Block type name including namespace.
	 * @return bool True if the block type is registered, false otherwise.
	 */
	public function is_registered( $name ) {
		return isset( $this->registered_block_types[ $name ] );
	}

	/**
	 * Utility method to retrieve the main instance of the class.
	 *
	 * The instance will be created if it does not exist yet.
	 *
	 * @since 5.0.0
	 *
	 * @return WP_Block_Type_Registry The main instance.
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}

		return self::$instance;
	}
}


<?php
/**
 * Blocks API: WP_Block_Type class
 *
 * @package WordPress
 * @subpackage Blocks
 * @since 5.0.0
 */

/**
 * Core class representing a block type.
 *
 * @since 5.0.0
 *
 * @see register_block_type()
 */
class WP_Block_Type {

	/**
	 * Block type key.
	 *
	 * @since 5.0.0
	 * @var string
	 */
	public $name;

	/**
	 * @since 5.5.0
	 * @var string
	 */
	public $title = '';

	/**
	 * @since 5.5.0
	 * @var string|null
	 */
	public $category = null;

	/**
	 * @since 5.5.0
	 * @var array|null
	 */
	public $parent = null;

	/**
	 * @since 5.5.0
	 * @var string|null
	 */
	public $icon = null;

	/**
	 * @since 5.5.0
	 * @var string
	 */
	public $description = '';

	/**
	 * @since 5.5.0
	 * @var array
	 */
	public $keywords = array();

	/**
	 * @since 5.5.0
	 * @var string|null
	 */
	public $textdomain = null;

	/**
	 * @since 5.5.0
	 * @var array
	 */
	public $styles = array();

	/**
	 * @since 5.5.0
	 * @var array|null
	 */
	public $supports = null;

	/**
	 * @since 5.5.0
	 * @var array|null
	 */
	public $example = null;

	/**
	 * Block type render callback.
	 *
	 * @since 5.0.0
	 * @var callable
	 */
	public $render_callback = null;

	/**
	 * Block type attributes property schemas.
	 *
	 * @since 5.0.0
	 * @var array|null
	 */
	public $attributes = null;

	/**
	 * Context values inherited by blocks of this type.
	 *
	 * @since 5.5.0
	 * @var array
	 */
	public $uses_context = array();

	/**
	 * Context provided by blocks of this type.
	 *
	 * @since 5.5.0
	 * @var array|null
	 */
	public $provides_context = null;

	/**
	 * Block type editor script handle.
	 *
	 * @since 5.0.0
	 * @var string|null
	 */
	public $editor_script = null;

	/**
	 * Block type front end script handle.
	 *
	 * @since 5.0.0
	 * @var string|null
	 */
	public $script = null;

	/**
	 * Block type editor style handle.
	 *
	 * @since 5.0.0
	 * @var string|null
	 */
	public $editor_style = null;

	/**
	 * Block type front end style handle.
	 *
	 * @since 5.0.0
	 * @var string|null
	 */
	public $style = null;

	/**
	 * Constructor.
	 *
	 * Will populate object properties from the provided arguments.
	 *
	 * @since 5.0.0
	 *
	 * @see register_block_type()
	 *
	 * @param string       $block_type Block type name including namespace.
	 * @param array|string $args       Optional. Array or string of arguments for registering a block type.
	 *                                 Default empty array.
	 */
	public function __construct( $block_type, $args = array() ) {
		$this->name = $block_type;

		$this->set_props( $args );
	}

	/**
	 * Renders the block type output for given attributes.
	 *
	 * @since 5.0.0
	 *
	 * @param array  $attributes Optional. Block attributes. Default empty array.
	 * @param string $content    Optional. Block content. Default empty string.
	 * @return string Rendered block type output.
	 */
	public function render( $attributes = array(), $content = '' ) {
		if ( ! $this->is_dynamic() ) {
			return '';
		}

		$attributes = $this->prepare_attributes_for_render( $attributes );

		return (string) call_user_func( $this->render_callback, $attributes, $content );
	}

	/**
	 * Returns true if the block type is dynamic, or false otherwise. A dynamic
	 * block is one which defers its rendering to occur on-demand at runtime.
	 *
	 * @since 5.0.0
	 *
	 * @return boolean Whether block type is dynamic.
	 */
	public function is_dynamic() {
		return is_callable( $this->render_callback );
	}

	/**
	 * Validates attributes against the current block schema, populating
	 * defaulted and missing values.
	 *
	 * @since 5.0.0
	 *
	 * @param array $attributes Original block attributes.
	 * @return array Prepared block attributes.
	 */
	public function prepare_attributes_for_render( $attributes ) {
		// If there are no attribute definitions for the block type, skip
		// processing and return vebatim.
		if ( ! isset( $this->attributes ) ) {
			return $attributes;
		}

		foreach ( $attributes as $attribute_name => $value ) {
			// If the attribute is not defined by the block type, it cannot be
			// validated.
			if ( ! isset( $this->attributes[ $attribute_name ] ) ) {
				continue;
			}

			$schema = $this->attributes[ $attribute_name ];

			// Validate value by JSON schema. An invalid value should revert to
			// its default, if one exists. This occurs by virtue of the missing
			// attributes loop immediately following. If there is not a default
			// assigned, the attribute value should remain unset.
			$is_valid = rest_validate_value_from_schema( $value, $schema );
			if ( is_wp_error( $is_valid ) ) {
				unset( $attributes[ $attribute_name ] );
			}
		}

		// Populate values of any missing attributes for which the block type
		// defines a default.
		$missing_schema_attributes = array_diff_key( $this->attributes, $attributes );
		foreach ( $missing_schema_attributes as $attribute_name => $schema ) {
			if ( isset( $schema['default'] ) ) {
				$attributes[ $attribute_name ] = $schema['default'];
			}
		}

		return $attributes;
	}

	/**
	 * Sets block type properties.
	 *
	 * @since 5.0.0
	 *
	 * @param array|string $args Array or string of arguments for registering a block type.
	 */
	public function set_props( $args ) {
		$args = wp_parse_args(
			$args,
			array(
				'render_callback' => null,
			)
		);

		$args['name'] = $this->name;

		/**
		 * Filters the arguments for registering a block type.
		 *
		 * @since 5.5.0
		 *
		 * @param array  $args       Array of arguments for registering a block type.
		 * @param string $block_type Block type name including namespace.
		 */
		$args = apply_filters( 'register_block_type_args', $args, $this->name );

		foreach ( $args as $property_name => $property_value ) {
			$this->$property_name = $property_value;
		}
	}

	/**
	 * Get all available block attributes including possible layout attribute from Columns block.
	 *
	 * @since 5.0.0
	 *
	 * @return array Array of attributes.
	 */
	public function get_attributes() {
		return is_array( $this->attributes ) ?
			$this->attributes :
			array();
	}
}


<?php
/**
 * Blocks API: WP_Block class
 *
 * @package WordPress
 * @since 5.5.0
 */

/**
 * Class representing a parsed instance of a block.
 *
 * @since 5.5.0
 * @property array $attributes
 */
class WP_Block {

	/**
	 * Original parsed array representation of block.
	 *
	 * @since 5.5.0
	 * @var array
	 */
	public $parsed_block;

	/**
	 * Name of block.
	 *
	 * @example "core/paragraph"
	 *
	 * @since 5.5.0
	 * @var string
	 */
	public $name;

	/**
	 * Block type associated with the instance.
	 *
	 * @since 5.5.0
	 * @var WP_Block_Type
	 */
	public $block_type;

	/**
	 * Block context values.
	 *
	 * @since 5.5.0
	 * @var array
	 */
	public $context = array();

	/**
	 * All available context of the current hierarchy.
	 *
	 * @since 5.5.0
	 * @var array
	 * @access protected
	 */
	protected $available_context;

	/**
	 * List of inner blocks (of this same class)
	 *
	 * @since 5.5.0
	 * @var WP_Block[]
	 */
	public $inner_blocks = array();

	/**
	 * Resultant HTML from inside block comment delimiters after removing inner
	 * blocks.
	 *
	 * @example "...Just <!-- wp:test /--> testing..." -> "Just testing..."
	 *
	 * @since 5.5.0
	 * @var string
	 */
	public $inner_html = '';

	/**
	 * List of string fragments and null markers where inner blocks were found
	 *
	 * @example array(
	 *   'inner_html'    => 'BeforeInnerAfter',
	 *   'inner_blocks'  => array( block, block ),
	 *   'inner_content' => array( 'Before', null, 'Inner', null, 'After' ),
	 * )
	 *
	 * @since 5.5.0
	 * @var array
	 */
	public $inner_content = array();

	/**
	 * Constructor.
	 *
	 * Populates object properties from the provided block instance argument.
	 *
	 * The given array of context values will not necessarily be available on
	 * the instance itself, but is treated as the full set of values provided by
	 * the block's ancestry. This is assigned to the private `available_context`
	 * property. Only values which are configured to consumed by the block via
	 * its registered type will be assigned to the block's `context` property.
	 *
	 * @since 5.5.0
	 *
	 * @param array                  $block             Array of parsed block properties.
	 * @param array                  $available_context Optional array of ancestry context values.
	 * @param WP_Block_Type_Registry $registry          Optional block type registry.
	 */
	public function __construct( $block, $available_context = array(), $registry = null ) {
		$this->parsed_block = $block;
		$this->name         = $block['blockName'];

		if ( is_null( $registry ) ) {
			$registry = WP_Block_Type_Registry::get_instance();
		}

		$this->block_type = $registry->get_registered( $this->name );

		$this->available_context = $available_context;

		if ( ! empty( $this->block_type->uses_context ) ) {
			foreach ( $this->block_type->uses_context as $context_name ) {
				if ( array_key_exists( $context_name, $this->available_context ) ) {
					$this->context[ $context_name ] = $this->available_context[ $context_name ];
				}
			}
		}

		if ( ! empty( $block['innerBlocks'] ) ) {
			$child_context = $this->available_context;

			if ( ! empty( $this->block_type->provides_context ) ) {
				foreach ( $this->block_type->provides_context as $context_name => $attribute_name ) {
					if ( array_key_exists( $attribute_name, $this->attributes ) ) {
						$child_context[ $context_name ] = $this->attributes[ $attribute_name ];
					}
				}
			}

			$this->inner_blocks = new WP_Block_List( $block['innerBlocks'], $child_context, $registry );
		}

		if ( ! empty( $block['innerHTML'] ) ) {
			$this->inner_html = $block['innerHTML'];
		}

		if ( ! empty( $block['innerContent'] ) ) {
			$this->inner_content = $block['innerContent'];
		}
	}

	/**
	 * Returns a value from an inaccessible property.
	 *
	 * This is used to lazily initialize the `attributes` property of a block,
	 * such that it is only prepared with default attributes at the time that
	 * the property is accessed. For all other inaccessible properties, a `null`
	 * value is returned.
	 *
	 * @since 5.5.0
	 *
	 * @param string $name Property name.
	 * @return array|null Prepared attributes, or null.
	 */
	public function __get( $name ) {
		if ( 'attributes' === $name ) {
			$this->attributes = isset( $this->parsed_block['attrs'] ) ?
				$this->parsed_block['attrs'] :
				array();

			if ( ! is_null( $this->block_type ) ) {
				$this->attributes = $this->block_type->prepare_attributes_for_render( $this->attributes );
			}

			return $this->attributes;
		}

		return null;
	}

	/**
	 * Generates the render output for the block.
	 *
	 * @since 5.5.0
	 *
	 * @param array $options {
	 *   Optional options object.
	 *
	 *   @type bool $dynamic Defaults to 'true'. Optionally set to false to avoid using the block's render_callback.
	 * }
	 * @return string Rendered block output.
	 */
	public function render( $options = array() ) {
		global $post;
		$options = wp_parse_args(
			$options,
			array(
				'dynamic' => true,
			)
		);

		$is_dynamic    = $options['dynamic'] && $this->name && null !== $this->block_type && $this->block_type->is_dynamic();
		$block_content = '';

		if ( ! $options['dynamic'] || empty( $this->block_type->skip_inner_blocks ) ) {
			$index = 0;
			foreach ( $this->inner_content as $chunk ) {
				$block_content .= is_string( $chunk ) ?
					$chunk :
					$this->inner_blocks[ $index++ ]->render();
			}
		}

		if ( $is_dynamic ) {
			$global_post   = $post;
			$block_content = (string) call_user_func( $this->block_type->render_callback, $this->attributes, $block_content, $this );
			$post          = $global_post;
		}

		if ( ! empty( $this->block_type->script ) ) {
			wp_enqueue_script( $this->block_type->script );
		}

		if ( ! empty( $this->block_type->style ) ) {
			wp_enqueue_style( $this->block_type->style );
		}

		/**
		 * Filters the content of a single block.
		 *
		 * @since 5.0.0
		 *
		 * @param string $block_content The block content about to be appended.
		 * @param array  $block         The full block, including name and attributes.
		 */
		return apply_filters( 'render_block', $block_content, $this->parsed_block );
	}

}


<?php
/**
 * Comment API: WP_Comment_Query class
 *
 * @package WordPress
 * @subpackage Comments
 * @since 4.4.0
 */

/**
 * Core class used for querying comments.
 *
 * @since 3.1.0
 *
 * @see WP_Comment_Query::__construct() for accepted arguments.
 */
class WP_Comment_Query {

	/**
	 * SQL for database query.
	 *
	 * @since 4.0.1
	 * @var string
	 */
	public $request;

	/**
	 * Metadata query container
	 *
	 * @since 3.5.0
	 * @var WP_Meta_Query A meta query instance.
	 */
	public $meta_query = false;

	/**
	 * Metadata query clauses.
	 *
	 * @since 4.4.0
	 * @var array
	 */
	protected $meta_query_clauses;

	/**
	 * SQL query clauses.
	 *
	 * @since 4.4.0
	 * @var array
	 */
	protected $sql_clauses = array(
		'select'  => '',
		'from'    => '',
		'where'   => array(),
		'groupby' => '',
		'orderby' => '',
		'limits'  => '',
	);

	/**
	 * SQL WHERE clause.
	 *
	 * Stored after the {@see 'comments_clauses'} filter is run on the compiled WHERE sub-clauses.
	 *
	 * @since 4.4.2
	 * @var string
	 */
	protected $filtered_where_clause;

	/**
	 * Date query container
	 *
	 * @since 3.7.0
	 * @var WP_Date_Query A date query instance.
	 */
	public $date_query = false;

	/**
	 * Query vars set by the user.
	 *
	 * @since 3.1.0
	 * @var array
	 */
	public $query_vars;

	/**
	 * Default values for query vars.
	 *
	 * @since 4.2.0
	 * @var array
	 */
	public $query_var_defaults;

	/**
	 * List of comments located by the query.
	 *
	 * @since 4.0.0
	 * @var array
	 */
	public $comments;

	/**
	 * The amount of found comments for the current query.
	 *
	 * @since 4.4.0
	 * @var int
	 */
	public $found_comments = 0;

	/**
	 * The number of pages.
	 *
	 * @since 4.4.0
	 * @var int
	 */
	public $max_num_pages = 0;

	/**
	 * Make private/protected methods readable for backward compatibility.
	 *
	 * @since 4.0.0
	 *
	 * @param string $name      Method to call.
	 * @param array  $arguments Arguments to pass when calling.
	 * @return mixed|false Return value of the callback, false otherwise.
	 */
	public function __call( $name, $arguments ) {
		if ( 'get_search_sql' === $name ) {
			return $this->get_search_sql( ...$arguments );
		}
		return false;
	}

	/**
	 * Constructor.
	 *
	 * Sets up the comment query, based on the query vars passed.
	 *
	 * @since 4.2.0
	 * @since 4.4.0 `$parent__in` and `$parent__not_in` were added.
	 * @since 4.4.0 Order by `comment__in` was added. `$update_comment_meta_cache`, `$no_found_rows`,
	 *              `$hierarchical`, and `$update_comment_post_cache` were added.
	 * @since 4.5.0 Introduced the `$author_url` argument.
	 * @since 4.6.0 Introduced the `$cache_domain` argument.
	 * @since 4.9.0 Introduced the `$paged` argument.
	 *
	 * @param string|array $query {
	 *     Optional. Array or query string of comment query parameters. Default empty.
	 *
	 *     @type string       $author_email              Comment author email address. Default empty.
	 *     @type string       $author_url                Comment author URL. Default empty.
	 *     @type array        $author__in                Array of author IDs to include comments for. Default empty.
	 *     @type array        $author__not_in            Array of author IDs to exclude comments for. Default empty.
	 *     @type array        $comment__in               Array of comment IDs to include. Default empty.
	 *     @type array        $comment__not_in           Array of comment IDs to exclude. Default empty.
	 *     @type bool         $count                     Whether to return a comment count (true) or array of
	 *                                                   comment objects (false). Default false.
	 *     @type array        $date_query                Date query clauses to limit comments by. See WP_Date_Query.
	 *                                                   Default null.
	 *     @type string       $fields                    Comment fields to return. Accepts 'ids' for comment IDs
	 *                                                   only or empty for all fields. Default empty.
	 *     @type int          $ID                        Currently unused.
	 *     @type array        $include_unapproved        Array of IDs or email addresses of users whose unapproved
	 *                                                   comments will be returned by the query regardless of
	 *                                                   `$status`. Default empty.
	 *     @type int          $karma                     Karma score to retrieve matching comments for.
	 *                                                   Default empty.
	 *     @type string       $meta_key                  Include comments with a matching comment meta key.
	 *                                                   Default empty.
	 *     @type string       $meta_value                Include comments with a matching comment meta value.
	 *                                                   Requires `$meta_key` to be set. Default empty.
	 *     @type array        $meta_query                Meta query clauses to limit retrieved comments by.
	 *                                                   See WP_Meta_Query. Default empty.
	 *     @type int          $number                    Maximum number of comments to retrieve.
	 *                                                   Default empty (no limit).
	 *     @type int          $paged                     When used with $number, defines the page of results to return.
	 *                                                   When used with $offset, $offset takes precedence. Default 1.
	 *     @type int          $offset                    Number of comments to offset the query. Used to build
	 *                                                   LIMIT clause. Default 0.
	 *     @type bool         $no_found_rows             Whether to disable the `SQL_CALC_FOUND_ROWS` query.
	 *                                                   Default: true.
	 *     @type string|array $orderby                   Comment status or array of statuses. To use 'meta_value'
	 *                                                   or 'meta_value_num', `$meta_key` must also be defined.
	 *                                                   To sort by a specific `$meta_query` clause, use that
	 *                                                   clause's array key. Accepts 'comment_agent',
	 *                                                   'comment_approved', 'comment_author',
	 *                                                   'comment_author_email', 'comment_author_IP',
	 *                                                   'comment_author_url', 'comment_content', 'comment_date',
	 *                                                   'comment_date_gmt', 'comment_ID', 'comment_karma',
	 *                                                   'comment_parent', 'comment_post_ID', 'comment_type',
	 *                                                   'user_id', 'comment__in', 'meta_value', 'meta_value_num',
	 *                                                   the value of $meta_key, and the array keys of
	 *                                                   `$meta_query`. Also accepts false, an empty array, or
	 *                                                   'none' to disable `ORDER BY` clause.
	 *                                                   Default: 'comment_date_gmt'.
	 *     @type string       $order                     How to order retrieved comments. Accepts 'ASC', 'DESC'.
	 *                                                   Default: 'DESC'.
	 *     @type int          $parent                    Parent ID of comment to retrieve children of.
	 *                                                   Default empty.
	 *     @type array        $parent__in                Array of parent IDs of comments to retrieve children for.
	 *                                                   Default empty.
	 *     @type array        $parent__not_in            Array of parent IDs of comments *not* to retrieve
	 *                                                   children for. Default empty.
	 *     @type array        $post_author__in           Array of author IDs to retrieve comments for.
	 *                                                   Default empty.
	 *     @type array        $post_author__not_in       Array of author IDs *not* to retrieve comments for.
	 *                                                   Default empty.
	 *     @type int          $post_ID                   Currently unused.
	 *     @type int          $post_id                   Limit results to those affiliated with a given post ID.
	 *                                                   Default 0.
	 *     @type array        $post__in                  Array of post IDs to include affiliated comments for.
	 *                                                   Default empty.
	 *     @type array        $post__not_in              Array of post IDs to exclude affiliated comments for.
	 *                                                   Default empty.
	 *     @type int          $post_author               Post author ID to limit results by. Default empty.
	 *     @type string|array $post_status               Post status or array of post statuses to retrieve
	 *                                                   affiliated comments for. Pass 'any' to match any value.
	 *                                                   Default empty.
	 *     @type string       $post_type                 Post type or array of post types to retrieve affiliated
	 *                                                   comments for. Pass 'any' to match any value. Default empty.
	 *     @type string       $post_name                 Post name to retrieve affiliated comments for.
	 *                                                   Default empty.
	 *     @type int          $post_parent               Post parent ID to retrieve affiliated comments for.
	 *                                                   Default empty.
	 *     @type string       $search                    Search term(s) to retrieve matching comments for.
	 *                                                   Default empty.
	 *     @type string|array $status                    Comment stati to limit results by. Accepts an array
	 *                                                   or space/comma-separated list of 'hold' (`comment_status=0`),
	 *                                                   'approve' (`comment_status=1`), 'all', or a custom
	 *                                                   comment status. Default 'all'.
	 *     @type string|array $type                      Include comments of a given type, or array of types.
	 *                                                   Accepts 'comment', 'pings' (includes 'pingback' and
	 *                                                   'trackback'), or anycustom type string. Default empty.
	 *     @type array        $type__in                  Include comments from a given array of comment types.
	 *                                                   Default empty.
	 *     @type array        $type__not_in              Exclude comments from a given array of comment types.
	 *                                                   Default empty.
	 *     @type int          $user_id                   Include comments for a specific user ID. Default empty.
	 *     @type bool|string  $hierarchical              Whether to include comment descendants in the results.
	 *                                                   'threaded' returns a tree, with each comment's children
	 *                                                   stored in a `children` property on the `WP_Comment`
	 *                                                   object. 'flat' returns a flat array of found comments plus
	 *                                                   their children. Pass `false` to leave out descendants.
	 *                                                   The parameter is ignored (forced to `false`) when
	 *                                                   `$fields` is 'ids' or 'counts'. Accepts 'threaded',
	 *                                                   'flat', or false. Default: false.
	 *     @type string       $cache_domain              Unique cache key to be produced when this query is stored in
	 *                                                   an object cache. Default is 'core'.
	 *     @type bool         $update_comment_meta_cache Whether to prime the metadata cache for found comments.
	 *                                                   Default true.
	 *     @type bool         $update_comment_post_cache Whether to prime the cache for comment posts.
	 *                                                   Default false.
	 * }
	 */
	public function __construct( $query = '' ) {
		$this->query_var_defaults = array(
			'author_email'              => '',
			'author_url'                => '',
			'author__in'                => '',
			'author__not_in'            => '',
			'include_unapproved'        => '',
			'fields'                    => '',
			'ID'                        => '',
			'comment__in'               => '',
			'comment__not_in'           => '',
			'karma'                     => '',
			'number'                    => '',
			'offset'                    => '',
			'no_found_rows'             => true,
			'orderby'                   => '',
			'order'                     => 'DESC',
			'paged'                     => 1,
			'parent'                    => '',
			'parent__in'                => '',
			'parent__not_in'            => '',
			'post_author__in'           => '',
			'post_author__not_in'       => '',
			'post_ID'                   => '',
			'post_id'                   => 0,
			'post__in'                  => '',
			'post__not_in'              => '',
			'post_author'               => '',
			'post_name'                 => '',
			'post_parent'               => '',
			'post_status'               => '',
			'post_type'                 => '',
			'status'                    => 'all',
			'type'                      => '',
			'type__in'                  => '',
			'type__not_in'              => '',
			'user_id'                   => '',
			'search'                    => '',
			'count'                     => false,
			'meta_key'                  => '',
			'meta_value'                => '',
			'meta_query'                => '',
			'date_query'                => null, // See WP_Date_Query.
			'hierarchical'              => false,
			'cache_domain'              => 'core',
			'update_comment_meta_cache' => true,
			'update_comment_post_cache' => false,
		);

		if ( ! empty( $query ) ) {
			$this->query( $query );
		}
	}

	/**
	 * Parse arguments passed to the comment query with default query parameters.
	 *
	 * @since 4.2.0 Extracted from WP_Comment_Query::query().
	 *
	 * @param string|array $query WP_Comment_Query arguments. See WP_Comment_Query::__construct()
	 */
	public function parse_query( $query = '' ) {
		if ( empty( $query ) ) {
			$query = $this->query_vars;
		}

		$this->query_vars = wp_parse_args( $query, $this->query_var_defaults );

		/**
		 * Fires after the comment query vars have been parsed.
		 *
		 * @since 4.2.0
		 *
		 * @param WP_Comment_Query $this The WP_Comment_Query instance (passed by reference).
		 */
		do_action_ref_array( 'parse_comment_query', array( &$this ) );
	}

	/**
	 * Sets up the WordPress query for retrieving comments.
	 *
	 * @since 3.1.0
	 * @since 4.1.0 Introduced 'comment__in', 'comment__not_in', 'post_author__in',
	 *              'post_author__not_in', 'author__in', 'author__not_in', 'post__in',
	 *              'post__not_in', 'include_unapproved', 'type__in', and 'type__not_in'
	 *              arguments to $query_vars.
	 * @since 4.2.0 Moved parsing to WP_Comment_Query::parse_query().
	 *
	 * @param string|array $query Array or URL query string of parameters.
	 * @return array|int List of comments, or number of comments when 'count' is passed as a query var.
	 */
	public function query( $query ) {
		$this->query_vars = wp_parse_args( $query );
		return $this->get_comments();
	}

	/**
	 * Get a list of comments matching the query vars.
	 *
	 * @since 4.2.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @return int|array List of comments or number of found comments if `$count` argument is true.
	 */
	public function get_comments() {
		global $wpdb;

		$this->parse_query();

		// Parse meta query.
		$this->meta_query = new WP_Meta_Query();
		$this->meta_query->parse_query_vars( $this->query_vars );

		/**
		 * Fires before comments are retrieved.
		 *
		 * @since 3.1.0
		 *
		 * @param WP_Comment_Query $this Current instance of WP_Comment_Query (passed by reference).
		 */
		do_action_ref_array( 'pre_get_comments', array( &$this ) );

		// Reparse query vars, in case they were modified in a 'pre_get_comments' callback.
		$this->meta_query->parse_query_vars( $this->query_vars );
		if ( ! empty( $this->meta_query->queries ) ) {
			$this->meta_query_clauses = $this->meta_query->get_sql( 'comment', $wpdb->comments, 'comment_ID', $this );
		}

		$comment_data = null;

		/**
		 * Filter the comments data before the query takes place.
		 *
		 * Return a non-null value to bypass WordPress's default comment queries.
		 *
		 * The expected return type from this filter depends on the value passed in the request query_vars.
		 * When `$this->query_vars['count']` is set, the filter should return the comment count as an int.
		 * When `'ids' === $this->query_vars['fields']`, the filter should return an array of comment IDs.
		 * Otherwise the filter should return an array of WP_Comment objects.
		 *
		 * @since 5.3.0
		 *
		 * @param array|int|null   $comment_data Return an array of comment data to short-circuit WP's comment query,
		 *                                       the comment count as an integer if `$this->query_vars['count']` is set,
		 *                                       or null to allow WP to run its normal queries.
		 * @param WP_Comment_Query $this         The WP_Comment_Query instance, passed by reference.
		 */
		$comment_data = apply_filters_ref_array( 'comments_pre_query', array( $comment_data, &$this ) );

		if ( null !== $comment_data ) {
			return $comment_data;
		}

		/*
		 * Only use the args defined in the query_var_defaults to compute the key,
		 * but ignore 'fields', which does not affect query results.
		 */
		$_args = wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) );
		unset( $_args['fields'] );

		$key          = md5( serialize( $_args ) );
		$last_changed = wp_cache_get_last_changed( 'comment' );

		$cache_key   = "get_comments:$key:$last_changed";
		$cache_value = wp_cache_get( $cache_key, 'comment' );
		if ( false === $cache_value ) {
			$comment_ids = $this->get_comment_ids();
			if ( $comment_ids ) {
				$this->set_found_comments();
			}

			$cache_value = array(
				'comment_ids'    => $comment_ids,
				'found_comments' => $this->found_comments,
			);
			wp_cache_add( $cache_key, $cache_value, 'comment' );
		} else {
			$comment_ids          = $cache_value['comment_ids'];
			$this->found_comments = $cache_value['found_comments'];
		}

		if ( $this->found_comments && $this->query_vars['number'] ) {
			$this->max_num_pages = ceil( $this->found_comments / $this->query_vars['number'] );
		}

		// If querying for a count only, there's nothing more to do.
		if ( $this->query_vars['count'] ) {
			// $comment_ids is actually a count in this case.
			return intval( $comment_ids );
		}

		$comment_ids = array_map( 'intval', $comment_ids );

		if ( 'ids' === $this->query_vars['fields'] ) {
			$this->comments = $comment_ids;
			return $this->comments;
		}

		_prime_comment_caches( $comment_ids, $this->query_vars['update_comment_meta_cache'] );

		// Fetch full comment objects from the primed cache.
		$_comments = array();
		foreach ( $comment_ids as $comment_id ) {
			$_comment = get_comment( $comment_id );
			if ( $_comment ) {
				$_comments[] = $_comment;
			}
		}

		// Prime comment post caches.
		if ( $this->query_vars['update_comment_post_cache'] ) {
			$comment_post_ids = array();
			foreach ( $_comments as $_comment ) {
				$comment_post_ids[] = $_comment->comment_post_ID;
			}

			_prime_post_caches( $comment_post_ids, false, false );
		}

		/**
		 * Filters the comment query results.
		 *
		 * @since 3.1.0
		 *
		 * @param WP_Comment[]     $_comments An array of comments.
		 * @param WP_Comment_Query $this      Current instance of WP_Comment_Query (passed by reference).
		 */
		$_comments = apply_filters_ref_array( 'the_comments', array( $_comments, &$this ) );

		// Convert to WP_Comment instances.
		$comments = array_map( 'get_comment', $_comments );

		if ( $this->query_vars['hierarchical'] ) {
			$comments = $this->fill_descendants( $comments );
		}

		$this->comments = $comments;
		return $this->comments;
	}

	/**
	 * Used internally to get a list of comment IDs matching the query vars.
	 *
	 * @since 4.4.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @return int|array A single count of comment IDs if a count query. An array of comment IDs if a full query.
	 */
	protected function get_comment_ids() {
		global $wpdb;

		// Assemble clauses related to 'comment_approved'.
		$approved_clauses = array();

		// 'status' accepts an array or a comma-separated string.
		$status_clauses = array();
		$statuses       = wp_parse_list( $this->query_vars['status'] );

		// Empty 'status' should be interpreted as 'all'.
		if ( empty( $statuses ) ) {
			$statuses = array( 'all' );
		}

		// 'any' overrides other statuses.
		if ( ! in_array( 'any', $statuses, true ) ) {
			foreach ( $statuses as $status ) {
				switch ( $status ) {
					case 'hold':
						$status_clauses[] = "comment_approved = '0'";
						break;

					case 'approve':
						$status_clauses[] = "comment_approved = '1'";
						break;

					case 'all':
					case '':
						$status_clauses[] = "( comment_approved = '0' OR comment_approved = '1' )";
						break;

					default:
						$status_clauses[] = $wpdb->prepare( 'comment_approved = %s', $status );
						break;
				}
			}

			if ( ! empty( $status_clauses ) ) {
				$approved_clauses[] = '( ' . implode( ' OR ', $status_clauses ) . ' )';
			}
		}

		// User IDs or emails whose unapproved comments are included, regardless of $status.
		if ( ! empty( $this->query_vars['include_unapproved'] ) ) {
			$include_unapproved = wp_parse_list( $this->query_vars['include_unapproved'] );

			$unapproved_ids    = array();
			$unapproved_emails = array();
			foreach ( $include_unapproved as $unapproved_identifier ) {
				// Numeric values are assumed to be user IDs.
				if ( is_numeric( $unapproved_identifier ) ) {
					$approved_clauses[] = $wpdb->prepare( "( user_id = %d AND comment_approved = '0' )", $unapproved_identifier );
				} else {
					// Otherwise we match against email addresses.
					if ( ! empty( $_GET['unapproved'] ) && ! empty( $_GET['moderation-hash'] ) ) {
						// Only include requested comment.
						$approved_clauses[] = $wpdb->prepare( "( comment_author_email = %s AND comment_approved = '0' AND comment_ID = %d )", $unapproved_identifier, (int) $_GET['unapproved'] );
					} else {
						// Include all of the author's unapproved comments.
						$approved_clauses[] = $wpdb->prepare( "( comment_author_email = %s AND comment_approved = '0' )", $unapproved_identifier );
					}
				}
			}
		}

		// Collapse comment_approved clauses into a single OR-separated clause.
		if ( ! empty( $approved_clauses ) ) {
			if ( 1 === count( $approved_clauses ) ) {
				$this->sql_clauses['where']['approved'] = $approved_clauses[0];
			} else {
				$this->sql_clauses['where']['approved'] = '( ' . implode( ' OR ', $approved_clauses ) . ' )';
			}
		}

		$order = ( 'ASC' === strtoupper( $this->query_vars['order'] ) ) ? 'ASC' : 'DESC';

		// Disable ORDER BY with 'none', an empty array, or boolean false.
		if ( in_array( $this->query_vars['orderby'], array( 'none', array(), false ), true ) ) {
			$orderby = '';
		} elseif ( ! empty( $this->query_vars['orderby'] ) ) {
			$ordersby = is_array( $this->query_vars['orderby'] ) ?
				$this->query_vars['orderby'] :
				preg_split( '/[,\s]/', $this->query_vars['orderby'] );

			$orderby_array            = array();
			$found_orderby_comment_id = false;
			foreach ( $ordersby as $_key => $_value ) {
				if ( ! $_value ) {
					continue;
				}

				if ( is_int( $_key ) ) {
					$_orderby = $_value;
					$_order   = $order;
				} else {
					$_orderby = $_key;
					$_order   = $_value;
				}

				if ( ! $found_orderby_comment_id && in_array( $_orderby, array( 'comment_ID', 'comment__in' ), true ) ) {
					$found_orderby_comment_id = true;
				}

				$parsed = $this->parse_orderby( $_orderby );

				if ( ! $parsed ) {
					continue;
				}

				if ( 'comment__in' === $_orderby ) {
					$orderby_array[] = $parsed;
					continue;
				}

				$orderby_array[] = $parsed . ' ' . $this->parse_order( $_order );
			}

			// If no valid clauses were found, order by comment_date_gmt.
			if ( empty( $orderby_array ) ) {
				$orderby_array[] = "$wpdb->comments.comment_date_gmt $order";
			}

			// To ensure determinate sorting, always include a comment_ID clause.
			if ( ! $found_orderby_comment_id ) {
				$comment_id_order = '';

				// Inherit order from comment_date or comment_date_gmt, if available.
				foreach ( $orderby_array as $orderby_clause ) {
					if ( preg_match( '/comment_date(?:_gmt)*\ (ASC|DESC)/', $orderby_clause, $match ) ) {
						$comment_id_order = $match[1];
						break;
					}
				}

				// If no date-related order is available, use the date from the first available clause.
				if ( ! $comment_id_order ) {
					foreach ( $orderby_array as $orderby_clause ) {
						if ( false !== strpos( 'ASC', $orderby_clause ) ) {
							$comment_id_order = 'ASC';
						} else {
							$comment_id_order = 'DESC';
						}

						break;
					}
				}

				// Default to DESC.
				if ( ! $comment_id_order ) {
					$comment_id_order = 'DESC';
				}

				$orderby_array[] = "$wpdb->comments.comment_ID $comment_id_order";
			}

			$orderby = implode( ', ', $orderby_array );
		} else {
			$orderby = "$wpdb->comments.comment_date_gmt $order";
		}

		$number = absint( $this->query_vars['number'] );
		$offset = absint( $this->query_vars['offset'] );
		$paged  = absint( $this->query_vars['paged'] );
		$limits = '';

		if ( ! empty( $number ) ) {
			if ( $offset ) {
				$limits = 'LIMIT ' . $offset . ',' . $number;
			} else {
				$limits = 'LIMIT ' . ( $number * ( $paged - 1 ) ) . ',' . $number;
			}
		}

		if ( $this->query_vars['count'] ) {
			$fields = 'COUNT(*)';
		} else {
			$fields = "$wpdb->comments.comment_ID";
		}

		$post_id = absint( $this->query_vars['post_id'] );
		if ( ! empty( $post_id ) ) {
			$this->sql_clauses['where']['post_id'] = $wpdb->prepare( 'comment_post_ID = %d', $post_id );
		}

		// Parse comment IDs for an IN clause.
		if ( ! empty( $this->query_vars['comment__in'] ) ) {
			$this->sql_clauses['where']['comment__in'] = "$wpdb->comments.comment_ID IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['comment__in'] ) ) . ' )';
		}

		// Parse comment IDs for a NOT IN clause.
		if ( ! empty( $this->query_vars['comment__not_in'] ) ) {
			$this->sql_clauses['where']['comment__not_in'] = "$wpdb->comments.comment_ID NOT IN ( " . implode( ',', wp_parse_id_list( $this->query_vars['comment__not_in'] ) ) . ' )';
		}

		// Parse comment parent IDs for an IN clause.
		if ( ! empty( $this->query_vars['parent__in'] ) ) {
			$this->sql_clauses['where']['parent__in'] = 'comment_parent IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['parent__in'] ) ) . ' )';
		}

		// Parse comment parent IDs for a NOT IN clause.
		if ( ! empty( $this->query_vars['parent__not_in'] ) ) {
			$this->sql_clauses['where']['parent__not_in'] = 'comment_parent NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['parent__not_in'] ) ) . ' )';
		}

		// Parse comment post IDs for an IN clause.
		if ( ! empty( $this->query_vars['post__in'] ) ) {
			$this->sql_clauses['where']['post__in'] = 'comment_post_ID IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post__in'] ) ) . ' )';
		}

		// Parse comment post IDs for a NOT IN clause.
		if ( ! empty( $this->query_vars['post__not_in'] ) ) {
			$this->sql_clauses['where']['post__not_in'] = 'comment_post_ID NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post__not_in'] ) ) . ' )';
		}

		if ( '' !== $this->query_vars['author_email'] ) {
			$this->sql_clauses['where']['author_email'] = $wpdb->prepare( 'comment_author_email = %s', $this->query_vars['author_email'] );
		}

		if ( '' !== $this->query_vars['author_url'] ) {
			$this->sql_clauses['where']['author_url'] = $wpdb->prepare( 'comment_author_url = %s', $this->query_vars['author_url'] );
		}

		if ( '' !== $this->query_vars['karma'] ) {
			$this->sql_clauses['where']['karma'] = $wpdb->prepare( 'comment_karma = %d', $this->query_vars['karma'] );
		}

		// Filtering by comment_type: 'type', 'type__in', 'type__not_in'.
		$raw_types = array(
			'IN'     => array_merge( (array) $this->query_vars['type'], (array) $this->query_vars['type__in'] ),
			'NOT IN' => (array) $this->query_vars['type__not_in'],
		);

		$comment_types = array();
		foreach ( $raw_types as $operator => $_raw_types ) {
			$_raw_types = array_unique( $_raw_types );

			foreach ( $_raw_types as $type ) {
				switch ( $type ) {
					// An empty translates to 'all', for backward compatibility.
					case '':
					case 'all':
						break;

					case 'comment':
					case 'comments':
						$comment_types[ $operator ][] = "''";
						$comment_types[ $operator ][] = "'comment'";
						break;

					case 'pings':
						$comment_types[ $operator ][] = "'pingback'";
						$comment_types[ $operator ][] = "'trackback'";
						break;

					default:
						$comment_types[ $operator ][] = $wpdb->prepare( '%s', $type );
						break;
				}
			}

			if ( ! empty( $comment_types[ $operator ] ) ) {
				$types_sql = implode( ', ', $comment_types[ $operator ] );
				$this->sql_clauses['where'][ 'comment_type__' . strtolower( str_replace( ' ', '_', $operator ) ) ] = "comment_type $operator ($types_sql)";
			}
		}

		$parent = $this->query_vars['parent'];
		if ( $this->query_vars['hierarchical'] && ! $parent ) {
			$parent = 0;
		}

		if ( '' !== $parent ) {
			$this->sql_clauses['where']['parent'] = $wpdb->prepare( 'comment_parent = %d', $parent );
		}

		if ( is_array( $this->query_vars['user_id'] ) ) {
			$this->sql_clauses['where']['user_id'] = 'user_id IN (' . implode( ',', array_map( 'absint', $this->query_vars['user_id'] ) ) . ')';
		} elseif ( '' !== $this->query_vars['user_id'] ) {
			$this->sql_clauses['where']['user_id'] = $wpdb->prepare( 'user_id = %d', $this->query_vars['user_id'] );
		}

		// Falsey search strings are ignored.
		if ( strlen( $this->query_vars['search'] ) ) {
			$search_sql = $this->get_search_sql(
				$this->query_vars['search'],
				array( 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_author_IP', 'comment_content' )
			);

			// Strip leading 'AND'.
			$this->sql_clauses['where']['search'] = preg_replace( '/^\s*AND\s*/', '', $search_sql );
		}

		// If any post-related query vars are passed, join the posts table.
		$join_posts_table = false;
		$plucked          = wp_array_slice_assoc( $this->query_vars, array( 'post_author', 'post_name', 'post_parent' ) );
		$post_fields      = array_filter( $plucked );

		if ( ! empty( $post_fields ) ) {
			$join_posts_table = true;
			foreach ( $post_fields as $field_name => $field_value ) {
				// $field_value may be an array.
				$esses = array_fill( 0, count( (array) $field_value ), '%s' );

				// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
				$this->sql_clauses['where'][ $field_name ] = $wpdb->prepare( " {$wpdb->posts}.{$field_name} IN (" . implode( ',', $esses ) . ')', $field_value );
			}
		}

		// 'post_status' and 'post_type' are handled separately, due to the specialized behavior of 'any'.
		foreach ( array( 'post_status', 'post_type' ) as $field_name ) {
			$q_values = array();
			if ( ! empty( $this->query_vars[ $field_name ] ) ) {
				$q_values = $this->query_vars[ $field_name ];
				if ( ! is_array( $q_values ) ) {
					$q_values = explode( ',', $q_values );
				}

				// 'any' will cause the query var to be ignored.
				if ( in_array( 'any', $q_values, true ) || empty( $q_values ) ) {
					continue;
				}

				$join_posts_table = true;

				$esses = array_fill( 0, count( $q_values ), '%s' );

				// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
				$this->sql_clauses['where'][ $field_name ] = $wpdb->prepare( " {$wpdb->posts}.{$field_name} IN (" . implode( ',', $esses ) . ')', $q_values );
			}
		}

		// Comment author IDs for an IN clause.
		if ( ! empty( $this->query_vars['author__in'] ) ) {
			$this->sql_clauses['where']['author__in'] = 'user_id IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['author__in'] ) ) . ' )';
		}

		// Comment author IDs for a NOT IN clause.
		if ( ! empty( $this->query_vars['author__not_in'] ) ) {
			$this->sql_clauses['where']['author__not_in'] = 'user_id NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['author__not_in'] ) ) . ' )';
		}

		// Post author IDs for an IN clause.
		if ( ! empty( $this->query_vars['post_author__in'] ) ) {
			$join_posts_table                              = true;
			$this->sql_clauses['where']['post_author__in'] = 'post_author IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post_author__in'] ) ) . ' )';
		}

		// Post author IDs for a NOT IN clause.
		if ( ! empty( $this->query_vars['post_author__not_in'] ) ) {
			$join_posts_table                                  = true;
			$this->sql_clauses['where']['post_author__not_in'] = 'post_author NOT IN ( ' . implode( ',', wp_parse_id_list( $this->query_vars['post_author__not_in'] ) ) . ' )';
		}

		$join    = '';
		$groupby = '';

		if ( $join_posts_table ) {
			$join .= "JOIN $wpdb->posts ON $wpdb->posts.ID = $wpdb->comments.comment_post_ID";
		}

		if ( ! empty( $this->meta_query_clauses ) ) {
			$join .= $this->meta_query_clauses['join'];

			// Strip leading 'AND'.
			$this->sql_clauses['where']['meta_query'] = preg_replace( '/^\s*AND\s*/', '', $this->meta_query_clauses['where'] );

			if ( ! $this->query_vars['count'] ) {
				$groupby = "{$wpdb->comments}.comment_ID";
			}
		}

		if ( ! empty( $this->query_vars['date_query'] ) && is_array( $this->query_vars['date_query'] ) ) {
			$this->date_query                         = new WP_Date_Query( $this->query_vars['date_query'], 'comment_date' );
			$this->sql_clauses['where']['date_query'] = preg_replace( '/^\s*AND\s*/', '', $this->date_query->get_sql() );
		}

		$where = implode( ' AND ', $this->sql_clauses['where'] );

		$pieces = array( 'fields', 'join', 'where', 'orderby', 'limits', 'groupby' );
		/**
		 * Filters the comment query clauses.
		 *
		 * @since 3.1.0
		 *
		 * @param string[]         $pieces An associative array of comment query clauses.
		 * @param WP_Comment_Query $this   Current instance of WP_Comment_Query (passed by reference).
		 */
		$clauses = apply_filters_ref_array( 'comments_clauses', array( compact( $pieces ), &$this ) );

		$fields  = isset( $clauses['fields'] ) ? $clauses['fields'] : '';
		$join    = isset( $clauses['join'] ) ? $clauses['join'] : '';
		$where   = isset( $clauses['where'] ) ? $clauses['where'] : '';
		$orderby = isset( $clauses['orderby'] ) ? $clauses['orderby'] : '';
		$limits  = isset( $clauses['limits'] ) ? $clauses['limits'] : '';
		$groupby = isset( $clauses['groupby'] ) ? $clauses['groupby'] : '';

		$this->filtered_where_clause = $where;

		if ( $where ) {
			$where = 'WHERE ' . $where;
		}

		if ( $groupby ) {
			$groupby = 'GROUP BY ' . $groupby;
		}

		if ( $orderby ) {
			$orderby = "ORDER BY $orderby";
		}

		$found_rows = '';
		if ( ! $this->query_vars['no_found_rows'] ) {
			$found_rows = 'SQL_CALC_FOUND_ROWS';
		}

		$this->sql_clauses['select']  = "SELECT $found_rows $fields";
		$this->sql_clauses['from']    = "FROM $wpdb->comments $join";
		$this->sql_clauses['groupby'] = $groupby;
		$this->sql_clauses['orderby'] = $orderby;
		$this->sql_clauses['limits']  = $limits;

		$this->request = "{$this->sql_clauses['select']} {$this->sql_clauses['from']} {$where} {$this->sql_clauses['groupby']} {$this->sql_clauses['orderby']} {$this->sql_clauses['limits']}";

		if ( $this->query_vars['count'] ) {
			return intval( $wpdb->get_var( $this->request ) );
		} else {
			$comment_ids = $wpdb->get_col( $this->request );
			return array_map( 'intval', $comment_ids );
		}
	}

	/**
	 * Populates found_comments and max_num_pages properties for the current
	 * query if the limit clause was used.
	 *
	 * @since 4.6.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 */
	private function set_found_comments() {
		global $wpdb;

		if ( $this->query_vars['number'] && ! $this->query_vars['no_found_rows'] ) {
			/**
			 * Filters the query used to retrieve found comment count.
			 *
			 * @since 4.4.0
			 *
			 * @param string           $found_comments_query SQL query. Default 'SELECT FOUND_ROWS()'.
			 * @param WP_Comment_Query $comment_query        The `WP_Comment_Query` instance.
			 */
			$found_comments_query = apply_filters( 'found_comments_query', 'SELECT FOUND_ROWS()', $this );

			$this->found_comments = (int) $wpdb->get_var( $found_comments_query );
		}
	}

	/**
	 * Fetch descendants for located comments.
	 *
	 * Instead of calling `get_children()` separately on each child comment, we do a single set of queries to fetch
	 * the descendant trees for all matched top-level comments.
	 *
	 * @since 4.4.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param WP_Comment[] $comments Array of top-level comments whose descendants should be filled in.
	 * @return array
	 */
	protected function fill_descendants( $comments ) {
		global $wpdb;

		$levels = array(
			0 => wp_list_pluck( $comments, 'comment_ID' ),
		);

		$key          = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) );
		$last_changed = wp_cache_get_last_changed( 'comment' );

		// Fetch an entire level of the descendant tree at a time.
		$level        = 0;
		$exclude_keys = array( 'parent', 'parent__in', 'parent__not_in' );
		do {
			// Parent-child relationships may be cached. Only query for those that are not.
			$child_ids           = array();
			$uncached_parent_ids = array();
			$_parent_ids         = $levels[ $level ];
			foreach ( $_parent_ids as $parent_id ) {
				$cache_key        = "get_comment_child_ids:$parent_id:$key:$last_changed";
				$parent_child_ids = wp_cache_get( $cache_key, 'comment' );
				if ( false !== $parent_child_ids ) {
					$child_ids = array_merge( $child_ids, $parent_child_ids );
				} else {
					$uncached_parent_ids[] = $parent_id;
				}
			}

			if ( $uncached_parent_ids ) {
				// Fetch this level of comments.
				$parent_query_args = $this->query_vars;
				foreach ( $exclude_keys as $exclude_key ) {
					$parent_query_args[ $exclude_key ] = '';
				}
				$parent_query_args['parent__in']    = $uncached_parent_ids;
				$parent_query_args['no_found_rows'] = true;
				$parent_query_args['hierarchical']  = false;
				$parent_query_args['offset']        = 0;
				$parent_query_args['number']        = 0;

				$level_comments = get_comments( $parent_query_args );

				// Cache parent-child relationships.
				$parent_map = array_fill_keys( $uncached_parent_ids, array() );
				foreach ( $level_comments as $level_comment ) {
					$parent_map[ $level_comment->comment_parent ][] = $level_comment->comment_ID;
					$child_ids[]                                    = $level_comment->comment_ID;
				}

				foreach ( $parent_map as $parent_id => $children ) {
					$cache_key = "get_comment_child_ids:$parent_id:$key:$last_changed";
					wp_cache_set( $cache_key, $children, 'comment' );
				}
			}

			$level++;
			$levels[ $level ] = $child_ids;
		} while ( $child_ids );

		// Prime comment caches for non-top-level comments.
		$descendant_ids = array();
		for ( $i = 1, $c = count( $levels ); $i < $c; $i++ ) {
			$descendant_ids = array_merge( $descendant_ids, $levels[ $i ] );
		}

		_prime_comment_caches( $descendant_ids, $this->query_vars['update_comment_meta_cache'] );

		// Assemble a flat array of all comments + descendants.
		$all_comments = $comments;
		foreach ( $descendant_ids as $descendant_id ) {
			$all_comments[] = get_comment( $descendant_id );
		}

		// If a threaded representation was requested, build the tree.
		if ( 'threaded' === $this->query_vars['hierarchical'] ) {
			$threaded_comments = array();
			$ref               = array();
			foreach ( $all_comments as $k => $c ) {
				$_c = get_comment( $c->comment_ID );

				// If the comment isn't in the reference array, it goes in the top level of the thread.
				if ( ! isset( $ref[ $c->comment_parent ] ) ) {
					$threaded_comments[ $_c->comment_ID ] = $_c;
					$ref[ $_c->comment_ID ]               = $threaded_comments[ $_c->comment_ID ];

					// Otherwise, set it as a child of its parent.
				} else {

					$ref[ $_c->comment_parent ]->add_child( $_c );
					$ref[ $_c->comment_ID ] = $ref[ $_c->comment_parent ]->get_child( $_c->comment_ID );
				}
			}

			// Set the 'populated_children' flag, to ensure additional database queries aren't run.
			foreach ( $ref as $_ref ) {
				$_ref->populated_children( true );
			}

			$comments = $threaded_comments;
		} else {
			$comments = $all_comments;
		}

		return $comments;
	}

	/**
	 * Used internally to generate an SQL string for searching across multiple columns
	 *
	 * @since 3.1.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string $string
	 * @param array  $cols
	 * @return string
	 */
	protected function get_search_sql( $string, $cols ) {
		global $wpdb;

		$like = '%' . $wpdb->esc_like( $string ) . '%';

		$searches = array();
		foreach ( $cols as $col ) {
			$searches[] = $wpdb->prepare( "$col LIKE %s", $like );
		}

		return ' AND (' . implode( ' OR ', $searches ) . ')';
	}

	/**
	 * Parse and sanitize 'orderby' keys passed to the comment query.
	 *
	 * @since 4.2.0
	 *
	 * @global wpdb $wpdb WordPress database abstraction object.
	 *
	 * @param string $orderby Alias for the field to order by.
	 * @return string|false Value to used in the ORDER clause. False otherwise.
	 */
	protected function parse_orderby( $orderby ) {
		global $wpdb;

		$allowed_keys = array(
			'comment_agent',
			'comment_approved',
			'comment_author',
			'comment_author_email',
			'comment_author_IP',
			'comment_author_url',
			'comment_content',
			'comment_date',
			'comment_date_gmt',
			'comment_ID',
			'comment_karma',
			'comment_parent',
			'comment_post_ID',
			'comment_type',
			'user_id',
		);

		if ( ! empty( $this->query_vars['meta_key'] ) ) {
			$allowed_keys[] = $this->query_vars['meta_key'];
			$allowed_keys[] = 'meta_value';
			$allowed_keys[] = 'meta_value_num';
		}

		$meta_query_clauses = $this->meta_query->get_clauses();
		if ( $meta_query_clauses ) {
			$allowed_keys = array_merge( $allowed_keys, array_keys( $meta_query_clauses ) );
		}

		$parsed = false;
		if ( $this->query_vars['meta_key'] === $orderby || 'meta_value' === $orderby ) {
			$parsed = "$wpdb->commentmeta.meta_value";
		} elseif ( 'meta_value_num' === $orderby ) {
			$parsed = "$wpdb->commentmeta.meta_value+0";
		} elseif ( 'comment__in' === $orderby ) {
			$comment__in = implode( ',', array_map( 'absint', $this->query_vars['comment__in'] ) );
			$parsed      = "FIELD( {$wpdb->comments}.comment_ID, $comment__in )";
		} elseif ( in_array( $orderby, $allowed_keys, true ) ) {

			if ( isset( $meta_query_clauses[ $orderby ] ) ) {
				$meta_clause = $meta_query_clauses[ $orderby ];
				$parsed      = sprintf( 'CAST(%s.meta_value AS %s)', esc_sql( $meta_clause['alias'] ), esc_sql( $meta_clause['cast'] ) );
			} else {
				$parsed = "$wpdb->comments.$orderby";
			}
		}

		return $parsed;
	}

	/**
	 * Parse an 'order' query variable and cast it to ASC or DESC as necessary.
	 *
	 * @since 4.2.0
	 *
	 * @param string $order The 'order' query variable.
	 * @return string The sanitized 'order' query variable.
	 */
	protected function parse_order( $order ) {
		if ( ! is_string( $order ) || empty( $order ) ) {
			return 'DESC';
		}

		if ( 'ASC' === strtoupper( $order ) ) {
			return 'ASC';
		} else {
			return 'DESC';
		}
	}
}