public static void PrintKernelItems <TTokenKind>(
this LrItemsDfa <TTokenKind> dfa,
TextWriter writer
) where TTokenKind : struct, Enum
{
dfa.PrintItemsHelper(writer, itemSet => itemSet.KernelItems);
}
private static void PrintItemsHelper <TTokenKind>(
this LrItemsDfa <TTokenKind> dfa,
TextWriter writer,
Func <ProductionItemSet <TTokenKind>, IEnumerable <ProductionItem <TTokenKind> > > itemsResolver
) where TTokenKind : struct, Enum
{
string maximalStateIndex = $"s{dfa.MaxState - 1}: ";
// Trimmed states are ordered 1,2,3,...,MaxState (because we neglect the dead state at index zero)
// To be consistent with dragon book we order states 0,1,2,...,MaxState-1 (as if dead state does not exist)
foreach (int state in dfa.GetTrimmedStates())
{
var itemSet = dfa.GetUnderlyingState(state);
var items = itemsResolver(itemSet);
string stateIndex = $"s{state - 1}:".PadRight(maximalStateIndex.Length);
writer.Write(stateIndex);
writer.WriteLine(items.First());
foreach (var kernelItem in items.Skip(1))
{
writer.Write(new string(' ', maximalStateIndex.Length));
writer.WriteLine(kernelItem);
}
}
}
