public void AddFirst(DotItem item, MutableIntSet output)
{
bool isNullable = tables.AddFirst(item.GetPattern(), item.Position, output);
if (isNullable)
{
output.AddAll(item.LA);
}
}
/// <summary>
/// Firsts set of the token chain
/// </summary>
/// <param name="tokenChain"></param>
/// <param name="output"></param>
/// <returns><c>true</c> if chain is nullable, <c>false</c> otherwise</returns>
public bool AddFirst(int[] tokenChain, int startIndex, MutableIntSet output)
{
bool result = true;
while (startIndex != tokenChain.Length)
{
int token = tokenChain[startIndex];
output.AddAll(firsts[token]);
if (!isNullable[token])
{
result = false;
break;
}
++startIndex;
}
return result;
}
