Implement auto-detect lyric's language.

osu.Game.Rulesets.Karaoke.Tests/Edit/Generator/Languages/LanguageDetectorTest.cs

@@ -0,0 +1,39 @@
+// Copyright (c) andy840119 <[email protected]>. Licensed under the GPL Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+using osu.Game.Rulesets.Karaoke.Edit.Generator.Languages;
+using osu.Game.Rulesets.Karaoke.Objects;
+using System.Globalization;
+
+namespace osu.Game.Rulesets.Karaoke.Tests.Edit.Generator.Languages
+{
+    [TestFixture]
+    public class LanguageDetectorTest
+    {
+        [TestCase("花火大会", "zh-CN")]
+        [TestCase("花火大會", "zh-TW")]
+        [TestCase("Testing", "en-US")]
+        public void TestDetectLanguage(string text, string language)
+        {
+            var detector = new LanguageDetector(generageConfig());
+            var result = detector.DetectLanguage(new Lyric { Text = text });
+            Assert.AreEqual(result, new CultureInfo(language));
+        }
+
+        [Ignore("Japanese text not supported now")]
+        [TestCase("ハナビ", "ja-jp")]
+        [TestCase("はなび", "ja-jp")]
+        public void TestJapaneseLanguage(string text, string language)
+        {
+            // todo : should fix this dictionary to add all Hiragana and Katakana
+            // https://github.com/pdonald/language-detection/blob/master/LanguageDetection/Profiles/ja
+            TestDetectLanguage(text, language);
+        }
+
+        private LanguageDetectorConfig generageConfig()
+        {
+            return new LanguageDetectorConfig();
+        }
+    }
+}

osu.Game.Rulesets.Karaoke/Edit/Generator/Languages/LanguageDetector.cs

@@ -0,0 +1,47 @@
+// Copyright (c) andy840119 <[email protected]>. Licensed under the GPL Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Game.Rulesets.Karaoke.Objects;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+
+namespace osu.Game.Rulesets.Karaoke.Edit.Generator.Languages
+{
+    public class LanguageDetector
+    {
+        private readonly LanguageDetection.LanguageDetector detector = new LanguageDetection.LanguageDetector();
+
+        public LanguageDetector(LanguageDetectorConfig config)
+        {
+            var targetLanguages = config?.AcceptLanguage?.Where(x => x != null).ToList() ?? new List<CultureInfo>();
+            if (targetLanguages.Any())
+            {
+                detector.AddLanguages(targetLanguages.Select(x => x.Name).ToArray());
+            }
+            else
+            {
+                detector.AddAllLanguages();
+            }
+        }
+
+        public CultureInfo DetectLanguage(Lyric lyric)
+        {
+            var result = detector.DetectAll(lyric.Text);
+            var languageCode = result.FirstOrDefault()?.Language;
+
+            if (languageCode == null)
+                return null;
+
+            // make some language conversion here
+            switch (languageCode)
+            {
+                // todo : need to think about is this needed?
+                case "en":
+                    return new CultureInfo("en-US");
+                default:
+                    return new CultureInfo(languageCode);
+            }
+        }
+    }
+}

osu.Game.Rulesets.Karaoke/Edit/Generator/Languages/LanguageDetectorConfig.cs

@@ -0,0 +1,12 @@
+// Copyright (c) andy840119 <[email protected]>. Licensed under the GPL Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Globalization;
+
+namespace osu.Game.Rulesets.Karaoke.Edit.Generator.Languages
+{
+    public class LanguageDetectorConfig
+    {
+        public CultureInfo[] AcceptLanguage { get; set; }
+    }
+}

osu.Game.Rulesets.Karaoke/osu.Game.Rulesets.Karaoke.csproj

@@ -11,6 +11,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="ILRepack.MSBuild.Task" Version="2.0.13" />
+    <PackageReference Include="LanguageDetection" Version="1.2.0" />
     <PackageReference Include="Octokit" Version="0.48.0" />
     <PackageReference Include="osu.Framework.KaraokeFont" Version="1.2.0" />
     <PackageReference Include="osu.Framework.Microphone" Version="1.0.10" />