feat(custom-page): 为自定义主页添加变量辅助方法 (#115)

* feat(custom-page): 同步上游自定义主页更新

* feat(wip): 大概搭个自定义变量的框架，具体实现有待商榷

* fix: ci

Author: Pigeon0v0

App/CustomVarible.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.IO; 
+using System.Text.Json.Nodes;
+using PCL.Core.IO;
+
+namespace PCL.Core.App;
+
+public class CustomVarible
+{
+    /// <summary>
+    /// 自定义主页变量保存路径。
+    /// </summary>
+    public static string VaribleJsonPath { get; } = Path.Combine(FileService.SharedDataPath, "varibles.json");
+    
+    /// <summary>
+    /// 存放所有自定义主页变量的 JSON 对象。
+    /// </summary>
+    public static JsonNode? VaribleJson;
+
+    public static Dictionary<string, string> VaribleDict = new();
+    
+    public static void Set(string key, string value)
+    {
+        
+    }
+    
+    public static void Get(string key, string value)
+    {
+        
+    }
+
+    public static void Init()
+    {
+        if (!File.Exists(VaribleJsonPath))
+        {
+            File.Create(VaribleJsonPath).Close();
+        }
+        else
+        {
+            try
+            {
+                VaribleJson = JsonNode.Parse(File.ReadAllText(VaribleJsonPath));
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine(e);
+                throw;
+            }
+        }
+    }
+}

Utils/Exts/StringExtension.cs

@@ -6,6 +6,7 @@
 using System.Linq;
 using System.Numerics;
 using System.Reflection;
+using System.Runtime.CompilerServices;
 using System.Text.RegularExpressions;
 
 namespace PCL.Core.Utils.Exts;
@@ -142,6 +143,26 @@ public string FromB32ToB10()
         }
     }
 
+    extension(string input)
+    {
+          
+        public T ParseToEnum<T>() where T : struct, Enum
+        {
+            if (String.IsNullOrWhiteSpace(input))
+            {
+                return (T)(object)0;
+            }
+            else if (int.TryParse(input, out int numericValue))
+            {
+                return (T)(object)numericValue;
+            }
+            else
+            {
+                return Enum.Parse<T>(input, true);
+            }
+        }
+    }
+
     extension([NotNullWhen(false)] string? value)
     {
         /// <summary>