Hack Woocommerce to add product custom fields - updated

woocommerce_template_functions.php

<form action="<?php echo esc_url( $_product->add_to_cart_url() ); ?>" class="variations_form cart" method="post">
			<table class="variations" cellspacing="0">
				<tbody>
				<?php foreach ($attributes as $name => $options) : ?>
					<tr>
						<td><label for="<?php echo sanitize_title($name); ?>"><?php echo $woocommerce->attribute_label($name); ?></label></td>

// START HACK HERE

						<?php if(is_array($options) && $options[0] == "CUSTOM_TEXT") : ?>
							<td> <input type="text" id="<?php echo esc_attr( sanitize_title($name) ); ?>" name="attribute_<?php echo sanitize_title($name); ?>"/></td>
						<?php else: ?>
							<td><select id="<?php echo esc_attr( sanitize_title($name) ); ?>" name="attribute_<?php echo sanitize_title($name); ?>">
								<option value=""><?php echo __('Choose an option', 'woothemes') ?>&hellip;</option>
								<?php if(is_array($options)) : ?>
									<?php
										// Get terms if this is a taxonomy - ordered
										if (taxonomy_exists(sanitize_title($name))) :
											$args = array('menu_order' => 'ASC');
											$terms = get_terms( sanitize_title($name), $args );
		
											foreach ($terms as $term) : 
												if (!in_array($term->slug, $options)) continue;
												echo '<option value="'.$term->slug.'">'.$term->name.'</option>';
											endforeach; 
										else :
											foreach ($options as $option) : 
												echo '<option value="'.$option.'">'.$option.'</option>';
											endforeach;
										endif;
									?>
								<?php endif;?>
							</td>
						<?php endif;?>

// END HACK HERE

					</tr>
                <?php endforeach;?>
				</tbody>
			</table>
			<div class="single_variation_wrap" style="display:none;">
				<div class="single_variation"></div>
				<div class="variations_button">
					<input type="hidden" name="variation_id" value="" />
					<div class="quantity"><input name="quantity" value="1" size="4" title="Qty" class="input-text qty text" maxlength="12" /></div>
					<button type="submit" class="button alt"><?php _e('Add to cart', 'woothemes'); ?></button>
				</div>
			</div>
			<div><input type="hidden" name="product_id" value="<?php echo esc_attr( $post->ID ); ?>" /></div>
			<?php do_action('woocommerce_add_to_cart_form'); ?>
		</form>

Just compared this script with version 2.0.3 script and it looks different. Seems this script is not updated.

Hi, I'm searching a way to add 2 number input fields in WooC. , validate price based on both values from inputs, and save values on order pages, I've aadded fields to single-product, but i can't set price and save those numbers, can you,please, help me/look at my code?