private static ValuePos _lastValuePos(StringBuilder sb, params char[] separators)
{
var res = new ValuePos();
if (sb.Length < 1)
return res;
res.EndIndex = sb.Length - 1;
// omit ending spaces: "aaa bbb ccc "
while (separators.Contains(sb[res.EndIndex]) && (res.EndIndex >= 0))
{
res.EndIndex--;
}
// Empty string without words " "
if ((res.EndIndex == 0) && separators.Contains(sb[0]))
{
res.EndIndex = -1;
return res;
}
// "Another words and an A"
res.StartIndex = res.EndIndex;
// "A "
if (res.StartIndex == 0)
return res;
// search for starting spaces: " aaa"
while (separators.Contains(sb[res.StartIndex]) && (res.StartIndex >= 0))
{
res.StartIndex--;
}
return res;
}
private static ValuePos _firstValuePos(StringBuilder sb, params char[] separators)
{
var res = new ValuePos();
if (sb.Length < 1)
return res;
res.StartIndex = 0;
// omit beginning spaces: " aaa bbb ccc"
while (separators.Contains(sb[res.StartIndex]) && (res.StartIndex < sb.Length))
{
res.StartIndex++;
}
// Empty string without words " "
if ((res.StartIndex == sb.Length) && separators.Contains(sb[res.StartIndex]))
{
res.StartIndex = -1;
return res;
}
// It could be one-char-word: " A and another words "
res.EndIndex = res.StartIndex;
// " A"
if (res.EndIndex == sb.Length - 1)
return res;
// search for ending spaces: "aaa "
while (!separators.Contains(sb[res.EndIndex]) && (res.EndIndex < sb.Length))
{
res.EndIndex++;
}
return res;
}