first commit

public/system/library/cart/length.php

@@ -0,0 +1,57 @@
+<?php
+namespace Cart;
+class Length {
+	private $lengths = array();
+
+	public function __construct($registry) {
+		$this->db = $registry->get('db');
+		$this->config = $registry->get('config');
+
+		$length_class_query = $this->db->query("SELECT * FROM " . DB_PREFIX . "length_class mc LEFT JOIN " . DB_PREFIX . "length_class_description mcd ON (mc.length_class_id = mcd.length_class_id) WHERE mcd.language_id = '" . (int)$this->config->get('config_language_id') . "'");
+
+		foreach ($length_class_query->rows as $result) {
+			$this->lengths[$result['length_class_id']] = array(
+				'length_class_id' => $result['length_class_id'],
+				'title'           => $result['title'],
+				'unit'            => $result['unit'],
+				'value'           => $result['value']
+			);
+		}
+	}
+
+	public function convert($value, $from, $to) {
+		if ($from == $to) {
+			return $value;
+		}
+
+		if (isset($this->lengths[$from])) {
+			$from = $this->lengths[$from]['value'];
+		} else {
+			$from = 1;
+		}
+
+		if (isset($this->lengths[$to])) {
+			$to = $this->lengths[$to]['value'];
+		} else {
+			$to = 1;
+		}
+
+		return $value * ($to / $from);
+	}
+
+	public function format($value, $length_class_id, $decimal_point = '.', $thousand_point = ',') {
+		if (isset($this->lengths[$length_class_id])) {
+			return number_format($value, 2, $decimal_point, $thousand_point) . $this->lengths[$length_class_id]['unit'];
+		} else {
+			return number_format($value, 2, $decimal_point, $thousand_point);
+		}
+	}
+
+	public function getUnit($length_class_id) {
+		if (isset($this->lengths[$length_class_id])) {
+			return $this->lengths[$length_class_id]['unit'];
+		} else {
+			return '';
+		}
+	}
+}