27 lines
1.1 KiB
C#
27 lines
1.1 KiB
C#
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using CanonSharp.Combinator.Abstractions;
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namespace CanonSharp.Combinator.Parsers.Modifiers;
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/// <summary>
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/// 翻转结果的解析器
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/// 当成功时失败
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/// 当失败时返回指定的成功结果
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/// </summary>
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/// <param name="parser">上游解析器</param>
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/// <param name="result">期望中的结果</param>
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/// <typeparam name="TToken">输入流的类型</typeparam>
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/// <typeparam name="TIntermediate">上游解析器结果类型</typeparam>
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/// <typeparam name="T">最终的返回结果</typeparam>
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internal sealed class ReverseParser<TToken, TIntermediate, T>(Parser<TToken, TIntermediate> parser, T result)
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: ModifiedParser<TToken, TIntermediate, T>(parser)
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{
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protected override ParseResult<TToken, T> Succeed<TState>(TState state,
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SuccessfulResult<TToken, TIntermediate> successfulResult)
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=> ParseResultBuilder.Fail<TToken, TState, T>($"Unexpected successful result: {successfulResult.Value}",
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state);
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protected override ParseResult<TToken, T> Fail<TState>(TState state,
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FailedResult<TToken, TIntermediate> failedResult)
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=> ParseResultBuilder.Succeed<TToken, TState, T>(result, state);
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}
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