public void RemoveAt(Cindex cindex, int length)
{
while (length > 0)
{
length = RemoveAtPartial(cindex, length);
UpdateChunksToCindex(cindex + length);
}
}
public void AddAt(string text, Cindex cindex)
{
int chunkIndex = GetChunkIndexByCindex(cindex);
DocumentChunk chunk = chunks[chunkIndex];
chunk.InsertText(text, cindex);
updatedToChunkIndex = Math.Min(updatedToChunkIndex, chunkIndex);
CheckChunkLength(chunkIndex, chunk);
}
private string SubStringWithConcat(int startChunkIndex, int endChunkIndex, Cindex from, Cindex to)
{
string subString = chunks[startChunkIndex].SubStringFromCharIndex(from);
for (int i = startChunkIndex + 1; i < endChunkIndex; i++)
{
subString += chunks[i].Text;
}
subString += chunks[endChunkIndex].SubStringToCharIndex(to);
return(subString);
}
private int RemoveAtPartial(Cindex cindex, int length)
{
int chunkIndex = GetChunkIndexByCindex(cindex);
DocumentChunk chunk = chunks[chunkIndex];
int availableLength = Math.Min(length, chunk.End + 1 - cindex);
if (availableLength == 0)
{
return(0);
}
chunk.RemoveText(cindex, availableLength);
updatedToChunkIndex = chunkIndex;
CheckChunkLength(chunkIndex, chunk);
return(length - availableLength);
}
private int GetChunkIndexByCindex(Cindex cindex)
{
UpdateChunksToCindex(cindex);
for (int chunkIndex = 0; chunkIndex < chunks.Count; chunkIndex++)
{
if (chunks[chunkIndex].Contains(cindex))
{
return(chunkIndex);
}
}
if (cindex == Length)
{
return(chunks.Count - 1);
}
throw new Exception(String.Format("Cindex {0} not found in DocumentChunkCollection of length {1}.", cindex, Length));
}
/* private void Display()
* {
* Console.WriteLine("==========================");
* foreach(DocumentChunk chunk in chunks)
* {
* Console.WriteLine(chunk);
* }
* } */
public string SubString(Cindex from, Cindex to)
{
if (to < from)
{
throw new Exception(String.Format("Document 'to' ({0}) is less than 'from' ({1}).", to, from));
}
int startChunkIndex = GetChunkIndexByCindex(from);
int endChunkIndex = GetChunkIndexByCindex(to);
if (startChunkIndex == endChunkIndex)
{
return(chunks[startChunkIndex].SubStringByCharIndex(from, to));
}
if (endChunkIndex - startChunkIndex < 3)
{
return(SubStringWithConcat(startChunkIndex, endChunkIndex, from, to));
}
else
{
return(SubStringWithStringBuilder(startChunkIndex, endChunkIndex, from, to));
}
}
private string SubStringWithStringBuilder(int startChunkIndex, int endChunkIndex, Cindex from, Cindex to)
{
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.Append(chunks[startChunkIndex].SubStringFromCharIndex(from));
for (int i = startChunkIndex + 1; i < endChunkIndex; i++)
{
stringBuilder.Append(chunks[i].Text);
}
stringBuilder.Append(chunks[endChunkIndex].SubStringToCharIndex(to));
return(stringBuilder.ToString());
}
