From 99b744ba52f538752bb0966e6d8b50d9f5a2f032 Mon Sep 17 00:00:00 2001
From: Brandon Millman <brandon.millman@gmail.com>
Date: Mon, 13 Aug 2018 18:31:41 -0700
Subject: Update sortingUtils to support Order and SignedOrder

---
 packages/order-utils/src/sorting_utils.ts | 70 ++++++++++++-------------------
 1 file changed, 26 insertions(+), 44 deletions(-)

(limited to 'packages')

diff --git a/packages/order-utils/src/sorting_utils.ts b/packages/order-utils/src/sorting_utils.ts
index f019aa4a8..8811bcaf8 100644
--- a/packages/order-utils/src/sorting_utils.ts
+++ b/packages/order-utils/src/sorting_utils.ts
@@ -1,5 +1,5 @@
 import { schemas } from '@0xproject/json-schemas';
-import { SignedOrder } from '@0xproject/types';
+import { Order } from '@0xproject/types';
 import { BigNumber } from '@0xproject/utils';
 import * as _ from 'lodash';
 
@@ -9,64 +9,46 @@ import { rateUtils } from './rate_utils';
 
 export const sortingUtils = {
     /**
-     * Takes an array of signed orders and sorts them by takerAsset/makerAsset rate in ascending order (best rate first).
+     * Takes an array of orders and sorts them by takerAsset/makerAsset rate in ascending order (best rate first).
      * Adjusts the rate of each order according to the feeRate and takerFee for that order.
-     * @param   signedFeeOrders     An array of objects that conform to the SignedOrder interface. All orders should specify ZRX as
-     *                              the makerAsset and WETH as the takerAsset.
-     * @param   feeRate             The market rate of ZRX denominated in takerAssetAmount
-     *                              (ex. feeRate is 0.1 takerAsset/ZRX if it takes 1 unit of takerAsset to buy 10 ZRX)
-     *                              Defaults to 0
+     * @param   orders      An array of objects that extend the Order interface. All orders should specify ZRX as
+     *                      the makerAsset and WETH as the takerAsset.
+     * @param   feeRate     The market rate of ZRX denominated in takerAssetAmount
+     *                      (ex. feeRate is 0.1 takerAsset/ZRX if it takes 1 unit of takerAsset to buy 10 ZRX)
+     *                      Defaults to 0
      * @return  The input orders sorted by rate in ascending order
      */
-    sortOrdersByFeeAdjustedRate(
-        signedOrders: SignedOrder[],
-        feeRate: BigNumber = constants.ZERO_AMOUNT,
-    ): SignedOrder[] {
-        assert.doesConformToSchema('signedOrders', signedOrders, schemas.signedOrdersSchema);
+    sortOrdersByFeeAdjustedRate<T extends Order>(orders: T[], feeRate: BigNumber = constants.ZERO_AMOUNT): T[] {
+        assert.doesConformToSchema('orders', orders, schemas.ordersSchema);
         assert.isBigNumber('feeRate', feeRate);
-        const rateCalculator = (signedOrder: SignedOrder) => rateUtils.getFeeAdjustedRateOfOrder(signedOrder, feeRate);
-        const sortedOrders = sortOrders(signedOrders, rateCalculator);
+        const rateCalculator = (order: Order) => rateUtils.getFeeAdjustedRateOfOrder(order, feeRate);
+        const sortedOrders = sortOrders(orders, rateCalculator);
         return sortedOrders;
     },
     /**
-     * Takes an array of signed fee orders (makerAssetData corresponds to ZRX and takerAssetData corresponds to WETH)
+     * Takes an array of fee orders (makerAssetData corresponds to ZRX and takerAssetData corresponds to WETH)
      * and sorts them by rate in ascending order (best rate first). Adjusts the rate according to the takerFee.
-     * @param   signedFeeOrders     An array of objects that conform to the SignedOrder interface. All orders should specify ZRX as
-     *                              the makerAsset and WETH as the takerAsset.
+     * @param   feeOrders       An array of objects that extend the Order interface. All orders should specify ZRX as
+     *                          the makerAsset and WETH as the takerAsset.
      * @return  The input orders sorted by rate in ascending order
      */
-    sortFeeOrdersByFeeAdjustedRate(signedFeeOrders: SignedOrder[]): SignedOrder[] {
-        assert.doesConformToSchema('signedFeeOrders', signedFeeOrders, schemas.signedOrdersSchema);
+    sortFeeOrdersByFeeAdjustedRate(feeOrders: Order[]): Order[] {
+        assert.doesConformToSchema('feeOrders', feeOrders, schemas.ordersSchema);
         const rateCalculator = rateUtils.getFeeAdjustedRateOfFeeOrder.bind(rateUtils);
-        const sortedOrders = sortOrders(signedFeeOrders, rateCalculator);
+        const sortedOrders = sortOrders(feeOrders, rateCalculator);
         return sortedOrders;
     },
 };
 
-type RateCalculator = (signedOrder: SignedOrder) => BigNumber;
+type RateCalculator = (order: Order) => BigNumber;
 
 // takes an array of orders, copies them, and sorts the copy based on the rate definition provided by rateCalculator
-const sortOrders = (signedOrders: SignedOrder[], rateCalculator: RateCalculator): SignedOrder[] => {
-    const copiedOrders = _.cloneDeep(signedOrders);
-    const feeOrderComparator = getOrderComparator(rateCalculator);
-    copiedOrders.sort(feeOrderComparator);
+function sortOrders<T extends Order>(orders: T[], rateCalculator: RateCalculator): T[] {
+    const copiedOrders = _.cloneDeep(orders);
+    copiedOrders.sort((firstOrder, secondOrder) => {
+        const firstOrderRate = rateCalculator(firstOrder);
+        const secondOrderRate = rateCalculator(secondOrder);
+        return firstOrderRate.comparedTo(secondOrderRate);
+    });
     return copiedOrders;
-};
-
-type Comparator<T> = (first: T, second: T) => number;
-
-// takes a function that calculates rate for a signed order and returns a comparator that sorts based on rate
-const getOrderComparator = (rateCalculator: RateCalculator): Comparator<SignedOrder> => (
-    firstSignedOrder,
-    secondSignedOrder,
-) => {
-    const firstOrderRate = rateCalculator(firstSignedOrder);
-    const secondOrderRate = rateCalculator(secondSignedOrder);
-    if (firstOrderRate.lt(secondOrderRate)) {
-        return -1;
-    } else if (firstOrderRate.gt(secondOrderRate)) {
-        return 1;
-    } else {
-        return 0;
-    }
-};
+}
-- 
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