public int Compare(Symbol x, Symbol y)
{
int comparison;
if (x == y)
{
return(0);
}
var xSortKey = x.GetLexicalSortKey();
var ySortKey = y.GetLexicalSortKey();
comparison = LexicalSortKey.Compare(xSortKey, ySortKey);
if (comparison != 0)
{
return(comparison);
}
comparison = ((ISymbol)x).Kind.ToSortOrder() - ((ISymbol)y).Kind.ToSortOrder();
if (comparison != 0)
{
return(comparison);
}
comparison = string.CompareOrdinal(x.Name, y.Name);
Debug.Assert(comparison != 0);
return(comparison);
}
/// <summary>
/// Compare two lexical sort keys in a compilation.
/// </summary>
public static int Compare(LexicalSortKey xSortKey, LexicalSortKey ySortKey)
{
int comparison;
if (xSortKey.TreeOrdinal != ySortKey.TreeOrdinal)
{
if (xSortKey.TreeOrdinal < 0)
{
return(1);
}
else if (ySortKey.TreeOrdinal < 0)
{
return(-1);
}
comparison = xSortKey.TreeOrdinal - ySortKey.TreeOrdinal;
Debug.Assert(comparison != 0);
return(comparison);
}
return(xSortKey.Position - ySortKey.Position);
}
public void SetFrom(LexicalSortKey other)
{
Debug.Assert(other.IsInitialized);
_treeOrdinal = other._treeOrdinal;
Volatile.Write(ref _position, other._position);
}
public static LexicalSortKey First(LexicalSortKey xSortKey, LexicalSortKey ySortKey)
{
int comparison = Compare(xSortKey, ySortKey);
return(comparison > 0 ? ySortKey : xSortKey);
}