jackfiled
cf19f8197e
Reviewed-on: https://git.bupt-hpc.cn/jackfiled/CanonSharp/pulls/3 Co-authored-by: jackfiled <xcrenchangjun@outlook.com> Co-committed-by: jackfiled <xcrenchangjun@outlook.com>
26 lines
1.0 KiB
C#
26 lines
1.0 KiB
C#
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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IParser<TToken, T> parser,
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Func<IFailedResult<TToken, T>, IParser<TToken, T>> failedHandler) : IParser<TToken, T>
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{
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public IParseResult<TToken, TResult> Run<TState, TResult>(TState state,
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Func<IParseResult<TToken, T>, IParseResult<TToken, TResult>> continuation)
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where TState : IReadState<TToken, TState>
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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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