private void AddTerms(ReadOnlyMemory <char> txt, char[] separators, List <ReadOnlyMemory <char> > terms)
{
Host.AssertNonEmpty(separators);
var rest = txt;
if (separators.Length > 1)
{
while (!rest.IsEmpty)
{
ReadOnlyMemory <char> term;
ReadOnlyMemoryUtils.SplitOne(rest, separators, out term, out rest);
term = ReadOnlyMemoryUtils.TrimSpaces(term);
if (!term.IsEmpty)
{
terms.Add(term);
}
}
}
else
{
var separator = separators[0];
while (!rest.IsEmpty)
{
ReadOnlyMemory <char> term;
ReadOnlyMemoryUtils.SplitOne(rest, separator, out term, out rest);
term = ReadOnlyMemoryUtils.TrimSpaces(term);
if (!term.IsEmpty)
{
terms.Add(term);
}
}
}
}
private int[][] CompileSlotMap(string slotMapString, int srcSlotCount)
{
var parts = ReadOnlyMemoryUtils.Split(slotMapString.AsMemory(), new[] { ';' }).ToArray();
var slotMap = new int[parts.Length][];
for (int i = 0; i < slotMap.Length; i++)
{
var slotIndices = ReadOnlyMemoryUtils.Split(parts[i], new[] { ',' }).ToArray();
var slots = new int[slotIndices.Length];
slotMap[i] = slots;
for (int j = 0; j < slots.Length; j++)
{
int index;
if (!int.TryParse(slotIndices[j].ToString(), out index) || index < 0 || index >= srcSlotCount)
{
throw Host.Except("Unexpected slot index '{1}' in group {0}. Expected 0 to {2}", i, slotIndices[j], srcSlotCount - 1);
}
slots[j] = index;
}
if (slots.Distinct().Count() < slots.Length)
{
throw Host.Except("Group '{0}' has duplicate slot indices", parts[i]);
}
}
return(slotMap);
}
/// <summary>
/// Returns the set of column ids which match the value of specified metadata kind.
/// The metadata type should be of type text.
/// </summary>
public static IEnumerable <int> GetColumnSet(this Schema schema, string metadataKind, string value)
{
for (int col = 0; col < schema.Count; col++)
{
var columnType = schema.GetMetadataTypeOrNull(metadataKind, col);
if (columnType != null && columnType.IsText)
{
ReadOnlyMemory <char> val = default;
schema.GetMetadata(metadataKind, col, ref val);
if (ReadOnlyMemoryUtils.EqualsStr(value, val))
{
yield return(col);
}
}
}
}