25 lines
980 B
C#
25 lines
980 B
C#
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using CanonSharp.Combinator.Abstractions;
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namespace CanonSharp.Combinator.Parsers.Bases;
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/// <summary>
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/// 恢复解析器
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/// 在上游解析器失败的情况下调用指定恢复函数返回的解析器
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/// </summary>
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/// <param name="parser">上游解析器</param>
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/// <param name="failedHandler">返回新解析器的恢复函数</param>
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/// <typeparam name="TToken">输入令牌类型</typeparam>
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/// <typeparam name="T">解析结果类型</typeparam>
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internal sealed class ResumeParser<TToken, T>(
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Parser<TToken, T> parser,
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Func<FailedResult<TToken, T>, Parser<TToken, T>> failedHandler) : Parser<TToken, T>
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{
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internal override ParseResult<TToken, TResult> Run<TState, TResult>(TState state,
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Func<ParseResult<TToken, T>, ParseResult<TToken, TResult>> continuation)
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{
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return parser.Run(state,
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result => result.CaseOf(continuation,
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failedResult => failedHandler(failedResult).Run(state, continuation)));
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}
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}
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