Extract code for low-level work with order from Sort to OrderHelper

CHANGELOG.md

@@ -26,6 +26,7 @@
 - Chg #166: Remove `EqualsEmpty` filter (@vjik)
 - Bug #173: Make `Like` filter case-sensitive (@arogachev)
 - New #173: Add `ILike` filter (case-insensitive variation of `Like` filter) (@arogachev)
+- New #176: Add `OrderHelper` (@vjik)
 
 ## 1.0.1 January 25, 2023
 

src/Reader/OrderHelper.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Yiisoft\Data\Reader;
+
+use function implode;
+use function preg_split;
+use function substr;
+use function trim;
+
+/**
+ * @psalm-import-type TOrder from Sort
+ */
+final class OrderHelper
+{
+    /**
+     * Create fields order array from an order string.
+     *
+     * The string consists of comma-separated field names.
+     * If the name is prefixed with `-`, field order is descending.
+     * Otherwise, the order is ascending.
+     *
+     * @param string $orderString Logical fields order as comma-separated string.
+     *
+     * @return array Logical fields order as array.
+     *
+     * @psalm-return TOrder
+     */
+    public static function stringToArray(string $orderString): array
+    {
+        $order = [];
+        $parts = preg_split('/\s*,\s*/', trim($orderString), -1, PREG_SPLIT_NO_EMPTY);
+
+        foreach ($parts as $part) {
+            if (str_starts_with($part, '-')) {
+                $order[substr($part, 1)] = 'desc';
+            } else {
+                $order[$part] = 'asc';
+            }
+        }
+
+        return $order;
+    }
+
+    /**
+     * Create an order string based on logical fields order array.
+     *
+     * The string consists of comma-separated field names.
+     * If the name is prefixed with `-`, field order is descending.
+     * Otherwise, the order is ascending.
+     *
+     * @param array $order Logical fields order as array.
+     *
+     * @return string An order string.
+     */
+    public static function arrayToString(array $order): string
+    {
+        $parts = [];
+        foreach ($order as $field => $direction) {
+            $parts[] = ($direction === 'desc' ? '-' : '') . $field;
+        }
+
+        return implode(',', $parts);
+    }
+}

src/Reader/Sort.php

@@ -8,13 +8,9 @@
 
 use function array_key_exists;
 use function array_merge;
-use function implode;
 use function is_array;
 use function is_int;
 use function is_string;
-use function preg_split;
-use function substr;
-use function trim;
 
 /**
  * Sort represents data sorting settings:
@@ -226,18 +222,9 @@ public static function any(array $config = []): self
      */
     public function withOrderString(string $orderString): self
     {
-        $order = [];
-        $parts = preg_split('/\s*,\s*/', trim($orderString), -1, PREG_SPLIT_NO_EMPTY);
-
-        foreach ($parts as $part) {
-            if (str_starts_with($part, '-')) {
-                $order[substr($part, 1)] = 'desc';
-            } else {
-                $order[$part] = 'asc';
-            }
-        }
-
-        return $this->withOrder($order);
+        return $this->withOrder(
+            OrderHelper::stringToArray($orderString)
+        );
     }
 
     /**
@@ -289,13 +276,7 @@ public function getOrder(): array
      */
     public function getOrderAsString(): string
     {
-        $parts = [];
-
-        foreach ($this->currentOrder as $field => $direction) {
-            $parts[] = ($direction === 'desc' ? '-' : '') . $field;
-        }
-
-        return implode(',', $parts);
+        return OrderHelper::arrayToString($this->currentOrder);
     }
 
     /**