parseOn method
Primitive method doing the actual parsing.
The method is overridden in concrete subclasses to implement the
parser specific logic. The methods takes a parse context
and
returns the resulting context, which is either a Success or
Failure context.
Implementation
@override
Result<R> parseOn(Context context) {
// Check the first choice:
final result = children[0].parseOn(context);
if (result is! Failure) return result;
var failure = result;
// Check all other choices:
for (var i = 1; i < children.length; i++) {
final result = children[i].parseOn(context);
if (result is! Failure) return result;
failure = failureJoiner(failure, result);
}
return failure;
}