woocommerce code for cart button

global $product;

echo apply_filters( 'woocommerce_loop_add_to_cart_link',
    sprintf( '<a href="%s" rel="nofollow" data-product_id="%s" data-product_sku="%s" class="button %s product_type_%s">%s</a>',
        esc_url( $product->add_to_cart_url() ),
        esc_attr( $product->id ),
        esc_attr( $product->get_sku() ),
        $product->is_purchasable() ? 'add_to_cart_button' : '',
        esc_attr( $product->product_type ),
        esc_html( $product->add_to_cart_text() )
    ),
$product );