dynamic pricing table

dynamic-pricing-table.php

<?php
function display_dynamic_pricing_table(){
	global $post;
	# see line 42 of woocommerce_pricing_by_product.class.php
	
	$pricing_rule_sets = get_option('_a_category_pricing_rules', array());
	$found = false;
	if(count($pricing_rule_sets)){
		global $woocommerce_pricing;
		foreach ($pricing_rule_sets as $pricing_rule_set) {
   			// check for category
   			$collector = isset($pricing_rule_set['collector']) ? $pricing_rule_set['collector'] : array();
   			
   			if($collector){
   				if($collector['type'] == 'cat_product'){
   					$in = false;
   					foreach($collector['args']['cats'] as $cat){
   						if(has_term($cat, 'product_cat', $post->ID)) $in = true;
   					}
   					if(!$in) continue;
   				}
   			}
      
   			$pricing_rule_sets = array(array('rules' => $pricing_rule_set['rules']));
   			$found = true;
   			break;
		}
	}
	if(!$found){
		$pricing_rule_sets = NULL;
	}
	
	$product_pricing_rule_sets = get_post_meta($post->ID, '_pricing_rules', true);
	
	if($product_pricing_rule_sets){
		$pricing_rule_sets = $product_pricing_rule_sets;
	}
	
	if(count($pricing_rule_sets)){
		$pricing = '';
		
		foreach($pricing_rule_sets as $ruleset){
			$rules = $ruleset['rules'];
			
			foreach($rules as $rule){
				$pricing .= '<tr>';
					$pricing .= '<td class="col1">'.$rule['from'];
						$pricing .= $rule['to'] ? ' - '.$rule['to'] : '+';
					$pricing .= '</td>';
					$pricing .= '<td>$'. number_format($rule['amount'], 2).'</td>';
				$pricing .= '</tr>';
			}
		}
		
		if($pricing){
			$output = <<<DYNAMICPRICING
			<div class="dynamic-pricing">
				<table class="pricing-table">
					<thead>
						<tr>
							<th class="col1">quantity</th>
							<th>price</th>
						</tr>
					</thead>
					<tbody>
						$pricing
					</tbody>
				</table>
			</div><!-- .dynamic-pricing -->
DYNAMICPRICING;

			echo $output;
		}
	}
}

I am sorry but this code doesn't seem to be working for me, I cannot find the woocommerce_pricing_by_product.class.php file anywhere and I figure that is why it isn't working. any help will be greatly appreciated.