/// <summary>
/// Copy a portion of source text into a target SourceText instance
/// </summary>
/// <param name="target"></param>
/// <param name="from">Start offste of the portion</param>
/// <param name="to">End offset of the portion</param>
public override void Copy(SourceText target, int from, int to)
{
if (!CheckRange(next, from, to) || target == null)
{
return;
}
if (!(target is StringSourceText))
{ // convert
int s = to - from;
char[] buf = new char[s];
Array.Copy(content, from, buf, 0, s);
target.ReplaceWithStr(buf, s);
return;
}
StringSourceText ct = (StringSourceText)target;
int nSave = to - from;
if (ct.size < nSave)
{
ct.Expand(nSave);
}
Array.Copy(content, from, ct.content, 0, nSave);
ct.next = nSave;
}
/// <summary>
/// Insert the content of a SourceText from a position up to a position.
/// </summary>
/// <param name="text">The SourceText to insert</param>
/// <param name="from">The start location</param>
/// <param name="to">The end location</param>
public override void Insert(SourceText paste, int from, int to)
{
StringSourceText ct;
char[] buf = null;
if (!(paste is StringSourceText))
{ // try to convert
int s = paste.Size;
buf = new char[s];
paste.CopyInStr(buf, s, 0, s);
ct = new StringSourceText(buf, s);
}
else
{
ct = (StringSourceText)paste;
}
int shift = ct.next - (to - from);
if (!CheckRange(next, from, to))
{
return;
}
if ((to - from) > 0)
{
Send(new TextChangeInfo(TextChanges.TextAboutDeleted, from, to));
}
if (HighWaterMark(shift))
{
Expand(GrowBy(size + shift));
}
if (shift < 0)
{
Array.Copy(content, to, content, to + shift, next - to);
}
else if (shift > 0)
{
Array.Copy(content, from, content, from + shift, next - from);
}
//---- insert pasted text
Array.Copy(ct.content, 0, content, from, ct.next);
next += shift;
if (LowWaterMark())
{
Expand(size / 2);
}
base.Insert(paste, from, to);
Send(new TextChangeInfo(TextChanges.TextReplaced, from, to, paste.Size), paste);
}
/// <summary>
/// Check if the given source text is equals to this one.
/// </summary>
/// <param name="text">The source text to be checked for equality</param>
/// <returns>true if both the given source text is equals to this one, false otherwise</returns>
public override bool Equals(object obj)
{
if (!(obj is StringSourceText))
{
return(false);
}
StringSourceText t = (StringSourceText)obj;
if (next != t.next)
{
return(false);
}
return(CompareArrays(content, t.content, next));
}
