<?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.
*
* @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 '';
}
$width = $attributes['style']['dimensions']['width'] ?? null;
if ( $width ) {
// Resolve preset references to their actual values.
$resolved_width = $width;
$is_preset = str_starts_with( $width, 'var:preset|dimension|' );
if ( $is_preset ) {
$slug = substr( $width, strlen( 'var:preset|dimension|' ) );
$dimension_presets = wp_get_global_settings(
array( 'dimensions', 'dimensionSizes' ),
array( 'block_name' => 'core/button' )
);
// Search origins in priority order: custom > theme > default.
if ( is_array( $dimension_presets ) ) {
foreach ( array( 'custom', 'theme', 'default' ) as $origin ) {
if ( empty( $dimension_presets[ $origin ] ) || ! is_array( $dimension_presets[ $origin ] ) ) {
continue;
}
foreach ( $dimension_presets[ $origin ] as $preset ) {
if ( isset( $preset['slug'] ) && $preset['slug'] === $slug ) {
$resolved_width = $preset['size'] ?? $width;
break 2;
}
}
}
}
}
$is_percentage = str_ends_with( $resolved_width, '%' );
$processor = new WP_HTML_Tag_Processor( $content );
// Target the outer wrapper div.
if ( $processor->next_tag( array( 'class_name' => 'wp-block-button' ) ) ) {
$processor->add_class( 'has-custom-width' );
$existing_style = $processor->get_attribute( 'style' );
$existing_style = is_string( $existing_style ) ? $existing_style : '';
if ( $is_percentage ) {
$numeric_width = (float) $resolved_width;
$processor->add_class( 'wp-block-button__width' );
// Maintain legacy class for the standard percentage widths.
$legacy_widths = array(
'25%' => 'wp-block-button__width-25',
'50%' => 'wp-block-button__width-50',
'75%' => 'wp-block-button__width-75',
'100%' => 'wp-block-button__width-100',
);
if ( isset( $legacy_widths[ $resolved_width ] ) ) {
$processor->add_class( $legacy_widths[ $resolved_width ] );
}
$width_style = "--wp--block-button--width: $numeric_width;";
$processor->set_attribute( 'style', $width_style . ( $existing_style ? ' ' . $existing_style : '' ) );
} else {
$css_value = $is_preset
? 'var(--wp--preset--dimension--' . _wp_to_kebab_case( $slug ) . ')'
: $width;
$width_style = "width: $css_value;";
$processor->set_attribute( 'style', $width_style . ( $existing_style ? ' ' . $existing_style : '' ) );
}
$content = $processor->get_updated_html();
}
}
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' );