/// <summary>
/// Gets the zero-based index of the first occurrence of the character <paramref name="c"/> in this <see cref="StringSegment"/>.
/// The search starts at <paramref name="start"/> and examines a specified number of <paramref name="count"/> character positions.
/// </summary>
/// <param name="c">The Unicode character to seek.</param>
/// <param name="start">The zero-based index position at which the search starts. </param>
/// <param name="count">The number of characters to examine.</param>
/// <returns>The zero-based index position of <paramref name="c"/> from the beginning of the <see cref="StringSegment"/> if that character is found, or -1 if it is not.</returns>
public int IndexOf(char c, int start, int count)
{
if (start < 0 || Offset + start > Buffer.Length)
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
}
if (count < 0 || Offset + start + count > Buffer.Length)
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.count);
}
var index = Buffer.IndexOf(c, start + Offset, count);
if (index != -1)
{
return(index - Offset);
}
else
{
return(index);
}
}
public int IndexOf(char c, int start, int count)
{
int offset = Offset + start;
if (!HasValue || start < 0 || (uint)offset > (uint)Buffer.Length)
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
}
if (count < 0)
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.count);
}
int index = AsSpan().Slice(start, count).IndexOf(c);
if (index >= 0)
{
index += start;
}
return(index);
}
public int IndexOf(char c, int start, int count)
{
var offset = Offset + start;
if (!HasValue || start < 0 || (uint)offset > (uint)Buffer.Length)
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.start);
}
if (count < 0)
{
ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.count);
}
var index = Buffer.IndexOf(c, offset, count);
if (index != -1)
{
index -= Offset;
}
return(index);
}