/// <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(length, from, to) || (target == null))
{
return;
}
if (!(target is GapSourceText))
{ // convert
int s = to - from;
char[] buf = new char[s + 1];
CopyTo(buf, 0, from, to);
buf[to - from] = '\0';
target.ReplaceWithStr(buf, s);
return;
}
GapSourceText ft = (GapSourceText)target;
int nSize = to - from;
ft.Empty();
if (ft.size < nSize)
{
ft.Expand(nSize, 0);
}
CopyTo(ft.body, 0, from, to);
ft.length = to - from;
ft.Update(to - from);
}
/// <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)
{
if (!CheckRange(length, from, to))
{
return;
}
GapSourceText ft;
char[] buf = null;
if (!(paste is GapSourceText))
{ // convert the text into a GapText
int s = paste.Size;
buf = new char[s];
paste.CopyInStr(buf, s, 0, s);
ft = new GapSourceText(buf, s, true);
}
else
{
ft = (GapSourceText)paste;
}
int shift = ft.length - (to - from);
if ((to - from) > 0)
{
Send(new TextChangeInfo(TextChanges.TextAboutDeleted, from, to));
}
if (HighWaterMark(shift))
{
Expand(GrowBy(size + shift), from);
}
else
{
MoveGap(from);
}
ft.CopyTo(body, from, 0, ft.length);
length += shift;
gaplen -= shift;
part1len += ft.length;
part2body -= shift;
part2len = length - part1len;
body2 = part2body + part1len;
if (LowWaterMark())
{
Shrink();
}
base.Insert(paste, from, to);
base.Send(new TextChangeInfo(TextChanges.TextReplaced, from, to, paste.Size), paste);
}
/// <summary>
/// Save a text portion of this SourceText in another SourceText
/// </summary>
/// <param name="from">The start position of the portion</param>
/// <param name="to">The end position of the portion</param>
/// <returns>The SourceText containing the portion</returns>
public override SourceText Save(int from, int to)
{
if (!CheckRange(length, from, to))
{
return(null);
}
GapSourceText t = new GapSourceText(to - from);
Copy(t, from, to);
return(t);
}
/// <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 text)
{
if (!(text is GapSourceText))
{
return(false);
}
GapSourceText t = (GapSourceText)text;
if (length != t.length)
{
return(false);
}
MoveGap(length);
t.MoveGap(t.length);
return(CompareArrays(body, t.body, length));
}
