fix path

QuickLook.Common/Helpers/TranslationHelper.cs

@@ -0,0 +1,86 @@
+// Copyright © 2017 Paddy Xu
+// 
+// This file is part of QuickLook program.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Xml.XPath;
+
+namespace QuickLook.Common.Helpers
+{
+    public class TranslationHelper
+    {
+        private static readonly CultureInfo CurrentCultureInfo = CultureInfo.CurrentUICulture;
+        //private static readonly CultureInfo CurrentCultureInfo = CultureInfo.GetCultureInfo("zh-CN");
+
+        private static readonly Dictionary<string, XPathNavigator> FileCache = new Dictionary<string, XPathNavigator>();
+
+        [MethodImpl(MethodImplOptions.NoInlining)]
+        public static string Get(string id, string file = null, CultureInfo locale = null, string failsafe = null,
+            Assembly calling = null)
+        {
+            if (file == null)
+                file = Path.Combine(Path.GetDirectoryName((calling ?? Assembly.GetCallingAssembly()).Location),
+                    "Translations.config");
+
+            if (!File.Exists(file))
+                return failsafe ?? id;
+
+            if (locale == null)
+                locale = CurrentCultureInfo;
+
+            var nav = GetLangFile(file);
+
+            // try to get string
+            var s = GetStringFromXml(nav, id, locale);
+            if (s != null)
+                return s;
+
+            // try again for parent language
+            if (locale.Parent.Name != string.Empty)
+                s = GetStringFromXml(nav, id, locale.Parent);
+            if (s != null)
+                return s;
+
+            // use fallback language
+            s = GetStringFromXml(nav, id, CultureInfo.GetCultureInfo("en"));
+            if (s != null)
+                return s;
+
+            return failsafe ?? id;
+        }
+
+        private static string GetStringFromXml(XPathNavigator nav, string id, CultureInfo locale)
+        {
+            var result = nav.SelectSingleNode($@"/Translations/{locale.Name}/{id}");
+
+            return result?.Value;
+        }
+
+        private static XPathNavigator GetLangFile(string file)
+        {
+            if (FileCache.ContainsKey(file))
+                return FileCache[file];
+
+            var res = new XPathDocument(file).CreateNavigator();
+            FileCache.Add(file, res);
+            return res;
+        }
+    }
+}