/// <summary>
/// Gets the index of the first occurrence of any element in the specified array.
/// </summary>
/// <param name="rope">The target rope.</param>
/// <param name="anyOf">Array of characters being searched.</param>
/// <param name="startIndex">Start index of the search.</param>
/// <param name="length">Length of the area to search.</param>
/// <returns>The first index where any character was found; or -1 if no occurrence was found.</returns>
public static int IndexOfAny(this Rope <char> rope, char[] anyOf, int startIndex, int length)
{
if (rope == null)
{
throw new ArgumentNullException("rope");
}
if (anyOf == null)
{
throw new ArgumentNullException("anyOf");
}
rope.VerifyRange(startIndex, length);
while (length > 0)
{
var entry = rope.FindNodeUsingCache(startIndex).PeekOrDefault();
char[] contents = entry.node.contents;
int startWithinNode = startIndex - entry.nodeStartIndex;
int nodeLength = Math.Min(entry.node.length, startWithinNode + length);
for (int i = startIndex - entry.nodeStartIndex; i < nodeLength; i++)
{
char element = contents[i];
foreach (char needle in anyOf)
{
if (element == needle)
{
return(entry.nodeStartIndex + i);
}
}
}
length -= nodeLength - startWithinNode;
startIndex = entry.nodeStartIndex + nodeLength;
}
return(-1);
}
/// <summary>
/// Retrieves the text for a portion of the rope and writes it to the specified text writer.
/// Runs in O(lg N + M), where M=<paramref name="length"/>.
/// </summary>
/// <exception cref="ArgumentOutOfRangeException">offset or length is outside the valid range.</exception>
/// <remarks>
/// This method counts as a read access and may be called concurrently to other read accesses.
/// </remarks>
public static void WriteTo(this Rope <char> rope, TextWriter output, int startIndex, int length)
{
if (rope == null)
{
throw new ArgumentNullException("rope");
}
if (output == null)
{
throw new ArgumentNullException("output");
}
rope.VerifyRange(startIndex, length);
rope.root.WriteTo(startIndex, output, length);
}
/// <summary>
/// Gets the index of the last occurrence of the search text.
/// </summary>
public static int LastIndexOf(this Rope <char> rope, string searchText, int startIndex, int length, StringComparison comparisonType)
{
if (rope == null)
{
throw new ArgumentNullException("rope");
}
if (searchText == null)
{
throw new ArgumentNullException("searchText");
}
rope.VerifyRange(startIndex, length);
int pos = rope.ToString(startIndex, length).LastIndexOf(searchText, comparisonType);
if (pos < 0)
{
return(-1);
}
else
{
return(pos + startIndex);
}
}