/// <summary>
/// Accumulates a replacement operation for a specified string span.
/// </summary>
/// <param name="span">The string span to replace.</param>
/// <param name="newValue">The string to use as a replacement.</param>
public void Replace(StringSpan span, string newValue)
{
if (newValue == null)
{
throw new ArgumentNullException(nameof(newValue));
}
ValidateSpan(span, _Value.Length);
_ReplaceCore(span, newValue);
}
/// <summary>
/// Validates a string span.
/// </summary>
/// <param name="span">The span.</param>
/// <param name="size">The string size.</param>
static void ValidateSpan(StringSpan span, int size)
{
if (span.StartIndex < 0)
{
throw new ArgumentOutOfRangeException(nameof(span), "Span start index cannot be less than zero.");
}
if (span.Length < 0)
{
throw new ArgumentOutOfRangeException(nameof(span), "Span length cannot be less than zero.");
}
if (span.Length > size - span.StartIndex)
{
throw new ArgumentOutOfRangeException(nameof(span), "Span start index and length must refer to a location within the string.");
}
}
/// <summary>
/// Replaces a specified string span with a new value.
/// </summary>
/// <param name="s">The string to edit.</param>
/// <param name="span">The string span to replace.</param>
/// <param name="newValue">The string to use as a replacement.</param>
public static string Replace(string s, StringSpan span, string newValue)
{
if (s == null)
{
throw new ArgumentNullException(nameof(s));
}
if (newValue == null)
{
throw new ArgumentNullException(nameof(newValue));
}
ValidateSpan(span, s.Length);
return(_ReplaceCore(s, span, newValue));
}
static string _ReplaceCore(string s, StringSpan span, string newValue)
{
int index = span.StartIndex;
int length = span.Length;
if (length != 0)
{
s = s.Remove(index, length);
}
if (newValue.Length != 0)
{
s = s.Insert(index, newValue);
}
return(s);
}
/// <summary>
/// Returns a new string in which a specified span has been deleted.
/// </summary>
/// <param name="s">The string to edit.</param>
/// <param name="span">The string span to remove.</param>
/// <returns>A new string that is equivalent to <paramref name="s"/> except for the removed characters.</returns>
public static string Remove(string s, StringSpan span)
{
if (s == null)
{
throw new ArgumentNullException(nameof(s));
}
ValidateSpan(span, s.Length);
if (span.Length == 0)
{
return(s);
}
else
{
return(s.Remove(span.StartIndex, span.Length));
}
}
void _ReplaceCore(StringSpan span, string newValue)
{
Operation compatibleOperation = null;
foreach (var i in _Operations)
{
if (i.Span == span)
{
compatibleOperation = i;
break;
}
}
if (compatibleOperation != null)
{
compatibleOperation.NewValue = newValue;
}
else
{
_Operations.Add(new Operation(span, newValue));
}
}
public Operation(StringSpan span, string newValue)
{
Span = span;
NewValue = newValue;
}
/// <summary> /// Accumulates a removal operation for a specified string span. /// </summary> /// <param name="span">The string span to remove.</param> public void Remove(StringSpan span) => Replace(span, string.Empty);