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Filename : icon.php
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<?php
/**
 * Server-side rendering of the `core/icon` block.
 *
 * @package WordPress
 */

/**
 * Renders the `core/icon` block on server.
 *
 * @since 7.0.0
 *
 * @param array    $attributes The block attributes.
 * @param string   $content    The block content.
 * @param WP_Block $block      The block instance.
 *
 * @return string Returns the Icon.
 */
function render_block_core_icon( $attributes ) {
	if ( empty( $attributes['icon'] ) ) {
		return;
	}

	$registry = WP_Icons_Registry::get_instance();
	$icon     = $registry->get_registered_icon( $attributes['icon'] );

	if ( is_null( $icon ) ) {
		return;
	}

	// Text color and background color.
	$color_styles = array();

	$preset_text_color    = array_key_exists( 'textColor', $attributes ) ? "var:preset|color|{$attributes['textColor']}" : null;
	$custom_text_color    = $attributes['style']['color']['text'] ?? null;
	$color_styles['text'] = $preset_text_color ? $preset_text_color : $custom_text_color;

	$preset_background_color    = array_key_exists( 'backgroundColor', $attributes ) ? "var:preset|color|{$attributes['backgroundColor']}" : null;
	$custom_background_color    = $attributes['style']['color']['background'] ?? null;
	$color_styles['background'] = $preset_background_color ? $preset_background_color : $custom_background_color;

	// Border.
	$border_styles = array();
	$sides         = array( 'top', 'right', 'bottom', 'left' );

	if ( isset( $attributes['style']['border']['radius'] ) ) {
		$border_styles['radius'] = $attributes['style']['border']['radius'];
	}
	if ( isset( $attributes['style']['border']['style'] ) ) {
		$border_styles['style'] = $attributes['style']['border']['style'];
	}
	if ( isset( $attributes['style']['border']['width'] ) ) {
		$border_styles['width'] = $attributes['style']['border']['width'];
	}

	$preset_color           = array_key_exists( 'borderColor', $attributes ) ? "var:preset|color|{$attributes['borderColor']}" : null;
	$custom_color           = $attributes['style']['border']['color'] ?? null;
	$border_styles['color'] = $preset_color ? $preset_color : $custom_color;

	foreach ( $sides as $side ) {
		$border                 = $attributes['style']['border'][ $side ] ?? null;
		$border_styles[ $side ] = array(
			'color' => $border['color'] ?? null,
			'style' => $border['style'] ?? null,
			'width' => $border['width'] ?? null,
		);
	}

	// Spacing (Padding).
	$spacing_styles = array();
	if ( isset( $attributes['style']['spacing']['padding'] ) ) {
		$spacing_styles['padding'] = $attributes['style']['spacing']['padding'];
	}

	// Dimensions (Width).
	$dimensions_styles = array();
	if ( isset( $attributes['style']['dimensions']['width'] ) ) {
		$dimensions_styles['width'] = $attributes['style']['dimensions']['width'];
	}

	// Generate styles and classes.
	$styles = wp_style_engine_get_styles(
		array(
			'color'      => $color_styles,
			'border'     => $border_styles,
			'spacing'    => $spacing_styles,
			'dimensions' => $dimensions_styles,
		),
	);

	$processor = new WP_HTML_Tag_Processor( $icon['content'] );
	$processor->next_tag( 'svg' );

	if ( ! empty( $styles['css'] ) ) {
		$processor->set_attribute( 'style', $styles['css'] );
	}
	if ( ! empty( $styles['classnames'] ) ) {
		$processor->add_class( $styles['classnames'] );
	}

	$aria_label = ! empty( $attributes['ariaLabel'] ) ? $attributes['ariaLabel'] : '';

	if ( ! $aria_label ) {
		// Icon is decorative, hide it from screen readers.
		$processor->set_attribute( 'aria-hidden', 'true' );
		$processor->set_attribute( 'focusable', 'false' );
	} else {
		$processor->set_attribute( 'role', 'img' );
		$processor->set_attribute( 'aria-label', $aria_label );
	}

	// Return the updated SVG markup.
	$svg        = $processor->get_updated_html();
	$attributes = get_block_wrapper_attributes();
	return sprintf( '<div %s>%s</div>', $attributes, $svg );
}


/**
 * Registers the `core/icon` block on server.
 *
 * @since 7.0.0
 */
function register_block_core_icon() {
	register_block_type_from_metadata(
		__DIR__ . '/icon',
		array(
			'render_callback' => 'render_block_core_icon',
		)
	);
}
add_action( 'init', 'register_block_core_icon' );