Source

File: wp-includes/class-wp-block.php

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'];
		}
	}