public IResult <TOutput> Parse(IParseState <TInput> state)
{
Assert.ArgumentNotNull(state, nameof(state));
var startCheckpoint = state.Input.Checkpoint();
try
{
var seqState = new State <TInput>(state);
var result = Function(seqState);
return(state.Success(this, result, seqState.Consumed, startCheckpoint.Location));
}
catch (ParseFailedException spe)
{
// This exception is part of normal flow-control for this parser
// Other exceptions bubble up like normal.
startCheckpoint.Rewind();
if (spe.Result != null)
{
var result = spe.Result;
state.Log(this, $"Parse failed during sequential callback: {result}\n\n{spe.StackTrace}");
return(state.Fail(this, $"Error during parsing: {result.Parser} {result.ErrorMessage} at {result.Location}"));
}
state.Log(this, $"Failure triggered during sequential callback: {spe.Message}");
return(state.Fail(this, $"Failure during parsing: {spe.Message}"));
}
catch (Exception e)
{
startCheckpoint.Rewind();
state.Log(this, $"Parse failed during sequential callback: {e.Message}");
throw;
}
}
/// <summary>
/// Create a Failure result.
/// </summary>
/// <typeparam name="TInput"></typeparam>
/// <param name="state"></param>
/// <param name="parser"></param>
/// <param name="error"></param>
/// <param name="location"></param>
/// <param name="data"></param>
/// <returns></returns>
public static IResult Fail <TInput>(this IParseState <TInput> state, IParser <TInput> parser, string error, Location location, IReadOnlyList <object>?data = null)
{
state.Log(parser, "Failed with error " + error);
return(new FailureResult <object>(parser, location, error, data));
}
/// <summary>
/// Create a Success result.
/// </summary>
/// <typeparam name="TInput"></typeparam>
/// <param name="state"></param>
/// <param name="parser"></param>
/// <param name="output"></param>
/// <param name="consumed"></param>
/// <param name="location"></param>
/// <param name="data"></param>
/// <returns></returns>
public static IResult <object> Success <TInput>(this IParseState <TInput> state, IParser <TInput> parser, object output, int consumed, Location location, IReadOnlyList <object>?data = null)
{
state.Log(parser, "Succeeded");
return(new SuccessResult <object>(parser, output, location, consumed, data));
}