public sealed override InternalResult <Unit> Parse(ref ParseState <TToken> state)
{
if (state.HasCurrent)
{
state.Error = new InternalError <TToken>(
Maybe.Just(state.Current),
false,
state.Location,
null
);
state.AddExpected(new Expected <TToken>());
return(InternalResult.Failure <Unit>(false));
}
return(InternalResult.Success(Unit.Value, false));
}
public override InternalResult <U> Parse(ref ParseState <TToken> state)
{
var start = state.Location;
state.PushBookmark(); // don't discard input buffer
var result = _parser.Parse(ref state);
if (!result.Success)
{
state.PopBookmark();
return(InternalResult.Failure <U>(result.ConsumedInput));
}
var delta = state.Location - start;
var inputRange = new InputRange <TToken>(state.LookBehind(delta), new Range(start, state.Location));
var val = _selector(inputRange, result.Value);
state.PopBookmark();
return(InternalResult.Success <U>(val, result.ConsumedInput));
}
public override InternalResult <SourcePos> Parse(ref ParseState <TToken> state) => InternalResult.Success(state.ComputeSourcePos(), false);
public sealed override InternalResult <T> Parse(ref ParseState <TToken> state) => InternalResult.Success <T>(_value, false);
internal override InternalResult <SourcePos> Parse(ref ParseState <TToken> state) => InternalResult.Success(state.SourcePos, false);
internal override InternalResult <int> Parse(ref ParseState <TToken> state) => InternalResult.Success(state.Location, false);