public static int LastIndexOf(this CharSpan chars, char ch)
{
int i = chars.Length - 1;
while (i >= 0 && chars[i] != ch)
{
i--;
}
return(i);
}
public static CharSpan TrimLeft(this CharSpan chars)
{
int skip = 0;
while (skip < chars.Length && char.IsWhiteSpace(chars[skip]))
{
skip++;
}
return(chars.Substring(skip));
}
public static CharSpan TrimRight(this CharSpan chars)
{
int length = chars.Length;
while (length != 0 && char.IsWhiteSpace(chars[length - 1]))
{
length--;
}
return(chars.Substring(0, length));
}
/// <summary>
/// Finds last whitespace character and returns substring that follows.
/// </summary>
public static CharSpan LastWord(this CharSpan chars)
{
for (int i = chars.Length - 1; i >= 0; i--)
{
if (char.IsWhiteSpace(chars[i]))
{
return(Substring(chars, i + 1));
}
}
return(chars);
}
public static CharSpan Substring(this CharSpan chars, int index, int length)
{
if (length == 0)
{
return(CharSpan.Empty);
}
if (length > chars.Length - index)
{
throw new ArgumentOutOfRangeException();
}
return(new CharSpan(chars.Buffer, chars.Start + index, length));
}
public static bool StartsWith(this CharSpan chars, string text)
{
if (text.Length > chars.Length)
{
return(false);
}
for (int i = 0; i < text.Length; i++)
{
if (text[i] != chars[i])
{
return(false);
}
}
return(true);
}
public bool Equals(CharSpan other)
{
if (other != null && other.Length == Length)
{
for (int i = 0; i < Length; i++)
{
if (other[i] != this[i])
{
return(false);
}
}
return(true);
}
return(false);
}
public static bool EndsWith(this CharSpan chars, CharSpan text)
{
if (text.Length > chars.Length)
{
return(false);
}
for (int i = 0; i < text.Length; i++)
{
if (text[i] != chars[chars.Length - text.Length + i])
{
return(false);
}
}
return(true);
}
public static CharSpan Substring(this CharSpan chars, int index)
=> index == 0
? chars
: index >= chars.Length
? CharSpan.Empty
: new CharSpan(chars.Buffer, chars.Start + index, chars.Length - index);
/// <summary>
/// Gets last character of the span or '\0' if span is empty.
/// </summary>
public static char LastChar(this CharSpan chars)
{
return(chars.Length != 0 ? chars[chars.Length - 1] : '\0');
}
public static CharSpan Trim(this CharSpan chars) => chars.TrimLeft().TrimRight();