Merge pull request #24 from dotnet-campus/t/lvyi/parse

支持解析字符串到日志级别

src/dotnetCampus.Logger/LogLevelParser.cs

@@ -0,0 +1,51 @@
+namespace dotnetCampus.Logging;
+
+/// <summary>
+/// 辅助将字符串解析为日志级别。
+/// </summary>
+public static class LogLevelParser
+{
+    /// <summary>
+    /// 尝试解析字符串为日志级别，支持常用的日志级别别名，大小写不敏感。
+    /// </summary>
+    /// <param name="text">要解析的字符串。</param>
+    /// <returns>日志级别。</returns>
+    /// <remarks>
+    /// 目前已支持的别名有：
+    /// <list type="bullet">
+    /// <item><description>追踪级：0, trace, tracing</description></item>
+    /// <item><description>调试级：1, debug, debugging</description></item>
+    /// <item><description>一般级：2, info, information</description></item>
+    /// <item><description>警告级：3, warn, warning</description></item>
+    /// <item><description>错误级：4, err, error</description></item>
+    /// <item><description>崩溃级：5, critical, fatal</description></item>
+    /// <item><description>无日志：6, no, none</description></item>
+    /// </list>
+    /// 其他所有字符串均返回 <see langword="null"/>。
+    /// </remarks>
+    public static LogLevel? Parse(string text) => text.ToLowerInvariant() switch
+    {
+        "trace" => LogLevel.Trace,
+        "tracing" => LogLevel.Trace,
+        "debug" => LogLevel.Debug,
+        "debugging" => LogLevel.Debug,
+        "info" => LogLevel.Information,
+        "information" => LogLevel.Information,
+        "warn" => LogLevel.Warning,
+        "warning" => LogLevel.Warning,
+        "err" => LogLevel.Error,
+        "error" => LogLevel.Error,
+        "critical" => LogLevel.Critical,
+        "fatal" => LogLevel.Critical,
+        "no" => LogLevel.None,
+        "none" => LogLevel.None,
+        "0" => LogLevel.Trace,
+        "1" => LogLevel.Debug,
+        "2" => LogLevel.Information,
+        "3" => LogLevel.Warning,
+        "4" => LogLevel.Error,
+        "5" => LogLevel.Critical,
+        "6" => LogLevel.None,
+        _ => null,
+    };
+}