private ReadOnlySpan <char> AppendNewline(ReadOnlySpan <char> chars)
{
m_buffer.Clear();
m_buffer.Fill(chars.Length + Environment.NewLine.Length, default);
chars.CopyTo(m_buffer.AsSpan());
Environment.NewLine.AsSpan().CopyTo(m_buffer.AsSpan().Slice(chars.Length));
return(m_buffer.AsSpan());
}
/// <summary>
/// Get a span of values at the given ID.
/// </summary>
protected Span <TValue> GetSpan(TId id)
{
int offset = Offsets[id.FromId() - 1];
int count = SingleValues[id.FromId() - 1];
return(MultiValues.AsSpan().Slice(offset, count));
}
/// <summary>
/// Get a span of values at the given ID.
/// </summary>
private Span <TValue> GetSpan(TId id)
{
int offset = Offsets[id.Value - 1];
int count = SingleValues[id.Value - 1];
return(MultiValues.AsSpan().Slice(offset, count));
}
/// <summary>
/// All relationships have been added; sort them all and build the final relation table.
/// </summary>
public void Complete()
{
m_list.AsSpan().Sort((tuple1, tuple2) =>
{
int fromIdCompare = tuple1.fromId.FromId().CompareTo(tuple2.fromId.FromId());
if (fromIdCompare != 0)
{
return(fromIdCompare);
}
return(tuple1.toId.FromId().CompareTo(tuple2.toId.FromId()));
});
// and bin them by groups
int listIndex = 0;
SpannableList <TToId> buffer = new SpannableList <TToId>();
int listCount = m_list.Count;
Table.SetMultiValueCapacity(listCount);
foreach (TFromId id in Table.BaseTableOpt.Ids)
{
if (listIndex >= m_list.Count)
{
// ran outta entries, rest all 0
break;
}
// Count up how many are for id.
int count = 0;
buffer.Clear();
// create a to-ID that will never equal any other ID (even default)
TToId lastToId = default(TToId).ToId(-1);
while (listIndex + count < m_list.Count)
{
var(fromId, toId) = m_list[listIndex + count];
if (fromId.Equals(id))
{
// drop duplicates (silently...)
// TODO: are duplicates here a logic bug? Because they do happen in practice.
if (!toId.Equals(lastToId))
{
buffer.Add(toId);
}
count++;
lastToId = toId;
continue;
}
// ok we're done
break;
}
Table.Add(buffer.AsSpan());
listIndex += count;
}
}
/// <summary>
/// Save this list of unmanaged values to the given filename in the given directory.
/// </summary>
public static void SaveToFile <TValue>(string directory, string name, SpannableList <TValue> values)
where TValue : unmanaged
{
string path = Path.Combine(directory, name);
using (Stream writer = File.OpenWrite(path))
{
// kind of a lot of work to write out an int, but whatevs
int[] length = new int[] { values.Count };
writer.Write(MemoryMarshal.Cast <int, byte>(new Span <int>(length)));
writer.Write(MemoryMarshal.Cast <TValue, byte>(values.AsSpan()));
}
}
/// <summary>
/// Load a list of unmanaged values from the given filename in the given directory.
/// </summary>
public static void LoadFromFile <TValue>(string directory, string name, SpannableList <TValue> values)
where TValue : unmanaged
{
values.Clear();
string path = Path.Combine(directory, name);
using (Stream reader = File.OpenRead(path))
{
int[] lengthBuf = new int[1];
reader.Read(MemoryMarshal.Cast <int, byte>(new Span <int>(lengthBuf)));
int length = lengthBuf[0];
values.Capacity = length;
values.Fill(length, default);
Span <TValue> valueSpan = values.AsSpan();
Span <byte> byteValueSpan = MemoryMarshal.Cast <TValue, byte>(valueSpan);
reader.Read(byteValueSpan);
}
}
