remove_action('init', 'register_block_core_search');

function render_cocoon_block_search( $attributes ) {
	$input_markup = sprintf(
		'<input type="text" class="search-edit" name="s" placeholder="%s" aria-label="input">',
		esc_attr( $attributes['placeholder'] )
	);
	$button_markup = '<button type="submit" class="search-submit" role="button" aria-label="button"></button>';
	return sprintf(
		'<form class="%s" role="search" method="get" action="%s">%s</form>',
		'search-box input-box',
		esc_url( home_url( '/' ) ),
		$input_markup . $button_markup
	);
}

function register_cocoon_block_search() {
	if (!is_amp() || !is_ssl())
	register_block_type(
		'core/search',
		array(
			'attributes'      => array(
				'placeholder' => array(
					'type'    => 'string',
					'default' => __( 'サイト内を検索', THEME_NAME ),
				),
			),
			'render_callback' => 'render_cocoon_block_search',
		)
	);
}
add_action('init', 'register_cocoon_block_search');