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<?php /** * Server-side rendering of the `core/button` block. * * @package WordPress */ /** * Renders the `core/button` block on the server, * * @since 6.6.0 * * @param array $attributes The block attributes. * @param string $content The block content. * @param WP_Block $block The block object. * * @return string The block content. */ function render_block_core_button( $attributes, $content ) { $p = new WP_HTML_Tag_Processor( $content ); /* * The button block can render an `<a>` or `<button>` and also has a * `<div>` wrapper. Find the a or button tag. */ $tag = null; while ( $p->next_tag() ) { $tag = $p->get_tag(); if ( 'A' === $tag || 'BUTTON' === $tag ) { break; } } /* * If this happens, the likelihood is there's no block content, * or the block has been modified by a plugin. */ if ( null === $tag ) { return $content; } // If the next token is the closing tag, the button is empty. $is_empty = true; while ( $p->next_token() && $tag !== $p->get_token_name() && $is_empty ) { if ( '#comment' !== $p->get_token_type() ) { /** * Anything else implies this is not empty. * This might include any text content (including a space), * inline images or other HTML. */ $is_empty = false; } } /* * When there's no text, render nothing for the block. * See https://github.com/WordPress/gutenberg/issues/17221 for the * reasoning behind this. */ if ( $is_empty ) { return ''; } return $content; } /** * Registers the `core/button` block on server. * * @since 6.6.0 */ function register_block_core_button() { register_block_type_from_metadata( __DIR__ . '/button', array( 'render_callback' => 'render_block_core_button', ) ); } add_action( 'init', 'register_block_core_button' );