93 lines
2.4 KiB
C#
93 lines
2.4 KiB
C#
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime.CompilerServices;
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namespace PCL.Core.App.Cli;
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/// <summary>
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/// 无泛型的命令行参数模型
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/// </summary>
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/// <seealso cref="CommandArgument{TValue}"/>
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public abstract class CommandArgument
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{
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/// <summary>
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/// 参数键
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/// </summary>
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public required string Key { get; init; }
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/// <summary>
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/// 参数值文本
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/// </summary>
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public required string ValueText { get; init; }
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/// <summary>
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/// 参数值类型
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/// </summary>
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public abstract ArgumentValueKind ValueKind { get; }
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/// <summary>
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/// 尝试以指定类型获取参数值
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/// </summary>
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/// <param name="value">参数值，若尝试失败则为该类型默认值</param>
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/// <typeparam name="T">参数值的类型</typeparam>
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/// <returns>是否成功，若类型不匹配则失败</returns>
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public abstract bool TryCastValue<T>([NotNullWhen(true)] out T? value);
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public T? CastValue<T>()
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{
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var result = TryCastValue(out T? value);
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return result ? value : throw new InvalidCastException("Value type mismatch or cannot cast");
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}
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}
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/// <summary>
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/// 命令行参数模型
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/// </summary>
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/// <typeparam name="TValue">参数值的类型</typeparam>
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public abstract class CommandArgument<TValue> : CommandArgument
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{
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/// <summary>
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/// 从参数值文本中解析参数类型
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/// </summary>
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/// <returns>对应类型的参数值</returns>
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protected abstract TValue ParseValueText();
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private bool _isValueParsed = false;
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/// <summary>
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/// 参数值
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/// </summary>
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public TValue Value
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{
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get
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{
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if (_isValueParsed) return field;
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_isValueParsed = true;
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return field = ParseValueText();
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}
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protected init
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{
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field = value;
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_isValueParsed = true;
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}
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} = default!;
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public override bool TryCastValue<T>([NotNullWhen(true)] out T value)
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{
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if (Value is T v)
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{
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value = v;
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return true;
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}
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value = default!;
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if (typeof(T) == typeof(string))
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{
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Unsafe.As<T, string>(ref value) = ValueText;
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#pragma warning disable CS8762 // The analyzer sucks.
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return true;
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#pragma warning restore CS8762
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}
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return false;
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}
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}
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