//============================================================
private static int SeekWithoutClamping(this StringView str, int start, SeekMode mode, Ward1D ward)
{
if (mode == SeekMode.MoveOneChar)
{
return(start + ward.GetOffset());
}
else if (mode == SeekMode.UntilNewline)
{
if (ward == Ward1D.Backward)
{
return(str.FindLast('\n', start + 1));
}
else if (ward == Ward1D.Forward)
{
return(str.FindFirst('\n', start));
}
}
else
{
Debug.Assert((mode
& (SeekMode.LiterallySpaced | SeekMode.PassingQuotation | SeekMode.BracketBalanced)) != 0);
if (ward == Ward1D.Backward)
{
return(str.SeekToSpaceBalanced(start, mode, -1, -1) - 1);
}
else if (ward == Ward1D.Forward)
{
return(str.SeekToSpaceBalanced(start + 1, mode, 1, 0));
}
}
throw new Exception();
}
//============================================================
public static IEnumerable <StringView> GetWords(this StringView str, Predicate <char> whitespacePred)
{
int p = str.GetFirstSpaceBoundary();
int n = str.GetLastSpaceBoundary();
// if all are whitespaces
if (p > n)
{
yield break;
}
for (int i = p; i != n; ++i)
{
if (str[i] == ' ')
{
yield return(str.GetSubView(p, i));
p = i = str.FindFirst((char c) => c != ' ', i);
}
}
yield return(str.GetSubView(p, n));
}
//============================================================
public static int GetFirstSpaceBoundary(this StringView str)
{
//return str.FindFirst(ChrCategory.WhitespacePredicate);
return(str.FindFirst(ChrCategory.WhitespacePredicate.InvertCondition()));
}
public static int FindFirst(this StringView str, char c, int start = 0)
{
return(str.FindFirst((char chr) => chr == c, start));
}