27 lines
1.2 KiB
C#
27 lines
1.2 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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/// 成功映射的解析器
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/// </summary>
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/// <param name="parser">上游解析器</param>
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/// <param name="successfulHandler">当上游成功时的处理函数</param>
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/// <param name="failedHandler">当上游失败时的处理函数</param>
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/// <typeparam name="TToken">输入流类型</typeparam>
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/// <typeparam name="TIntermediate">上游解析器解析结果类型</typeparam>
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/// <typeparam name="T">最终的解析结果类型</typeparam>
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internal sealed class SuccessfulMapParser<TToken, TIntermediate, T>(
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Parser<TToken, TIntermediate> parser,
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Func<TIntermediate, T> successfulHandler,
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Func<FailedResult<TToken, TIntermediate>, T> failedHandler) : 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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=> successfulResult.Map(successfulHandler);
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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>(failedHandler(failedResult), state);
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}
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