<?php

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/**

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* Server-side rendering of the `core/button` block.

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*

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* @package WordPress

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*/

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/**

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* Renders the `core/button` block on the server,

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*

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* @since 6.6.0

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*

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* @param array $attributes The block attributes.

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* @param string $content The block content.

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* @param WP_Block $block The block object.

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*

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* @return string The block content.

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*/

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function render_block_core_button( $attributes, $content ) {

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$p = new WP_HTML_Tag_Processor( $content );

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/*

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* The button block can render an `<a>` or `<button>` and also has a

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* `<div>` wrapper. Find the a or button tag.

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*/

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$tag = null;

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while ( $p->next_tag() ) {

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$tag = $p->get_tag();

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if ( 'A' === $tag || 'BUTTON' === $tag ) {

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break;

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}

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}

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/*

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* If this happens, the likelihood is there's no block content,

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* or the block has been modified by a plugin.

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*/

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if ( null === $tag ) {

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return $content;

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}

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// If the next token is the closing tag, the button is empty.

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$is_empty = true;

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while ( $p->next_token() && $tag !== $p->get_token_name() && $is_empty ) {

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if ( '#comment' !== $p->get_token_type() ) {

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/**

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* Anything else implies this is not empty.

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* This might include any text content (including a space),

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* inline images or other HTML.

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*/

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$is_empty = false;

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}

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}

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/*

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* When there's no text, render nothing for the block.

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* See https://github.com/WordPress/gutenberg/issues/17221 for the

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* reasoning behind this.

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*/

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if ( $is_empty ) {

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return '';

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}

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return $content;

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}

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/**

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* Registers the `core/button` block on server.

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*

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* @since 6.6.0

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*/

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function register_block_core_button() {

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register_block_type_from_metadata(

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__DIR__ . '/button',

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array(

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'render_callback' => 'render_block_core_button',

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)

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);

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}

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add_action( 'init', 'register_block_core_button' );

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