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;
}
}
public IResult <IReadOnlyList <TOutput> > Parse(IParseState <TInput> state)
{
Assert.ArgumentNotNull(state, nameof(state));
var startCheckpoint = state.Input.Checkpoint();
var items = new List <TOutput>();
int consumed = 0;
while (Maximum == null || items.Count < Maximum)
{
var result = _parser.Parse(state);
if (!result.Success)
{
break;
}
consumed += result.Consumed;
items.Add(result.Value);
if (items.Count >= Minimum && result.Consumed == 0)
{
break;
}
}
if (Minimum > 0 && items.Count < Minimum)
{
startCheckpoint.Rewind();
return(state.Fail(this, $"Expected at least {Minimum} items but only found {items.Count}", startCheckpoint.Location));
}
return(state.Success(this, items, consumed, startCheckpoint.Location));
}
public IResult <TOutput> Parse(IParseState <TInput> state)
{
Assert.ArgumentNotNull(state, nameof(state));
return(_quantifier switch
{
Quantifier.ExactlyOne => ParseExactlyOne(state),
Quantifier.ZeroOrOne => ParseZeroOrOne(state),
Quantifier.ZeroOrMore => ParseZeroOrMore(state),
_ => state.Fail(this, $"Quantifier value {_quantifier} not supported"),
});
