public virtual object Clone()
{
var clone = new OutlineRegionCollection(this.TextBufferVersion);
foreach (var item in this)
{
clone.Add(item.Clone() as OutlineRegion);
}
return(clone);
}
private static void BuildRegions(OutlineRegionCollection newRegions, ITextSnapshot snapshot)
{
// Figure out regions based on line indent
if (snapshot.LineCount == 0)
{
return;
}
var regionStack = new Stack <CodeBlock>();
var lineLengths = new int[snapshot.LineCount];
var lastBlockIndent = 0;
for (var i = 0; i < snapshot.LineCount; i++)
{
var line = snapshot.GetLineFromLineNumber(i);
var lineText = line.GetText();
if (string.IsNullOrWhiteSpace(lineText))
{
lineLengths[i] = 0;
continue;
}
lineLengths[i] = line.Length;
var indent = GetLineIndent(line);
if (regionStack.Count > 0)
{
lastBlockIndent = regionStack.Peek().Indent;
}
else
{
lastBlockIndent = 0;
}
if (indent <= lastBlockIndent)
{
// We add regions optimistically since any line can
// start a new region if lines below it are indented
// deeper that this line.
while (regionStack.Count > 0)
{
// If we have line with the same indent, remove previously added region
// and replace it with a new one potentially starting with the current line.
var prevCodeBlock = regionStack.Pop();
var startLine = snapshot.GetLineNumberFromPosition(prevCodeBlock.Start);
// Trim empty lines
var j = i - 1;
for (; j >= 0; j--)
{
if (lineLengths[j] > 0)
{
break;
}
}
j++;
if (j > 0 && j - startLine >= _minLinesToOutline)
{
var prevLine = snapshot.GetLineFromLineNumber(j - 1);
if (prevCodeBlock.Start < prevLine.End)
{
newRegions.Add(OutlineRegion.FromBounds(snapshot.TextBuffer, prevCodeBlock.Start, prevLine.End));
}
}
if (regionStack.Count > 0)
{
prevCodeBlock = regionStack.Peek();
if (prevCodeBlock.Indent < indent)
{
break;
}
}
}
}
lastBlockIndent = indent;
regionStack.Push(new CodeBlock(line.Start, indent));
}
// Note that last region may be bogus since we add regions optimistically.
// Remove last region if its indent is the same as the line before it
if (regionStack.Count > 0)
{
var codeBlock = regionStack.Peek();
var lineNumber = snapshot.GetLineNumberFromPosition(codeBlock.Start);
if (lineNumber > 0)
{
var prevLine = snapshot.GetLineFromLineNumber(lineNumber - 1);
var indent = GetLineIndent(prevLine);
if (indent == codeBlock.Indent)
{
regionStack.Pop();
}
}
}
while (regionStack.Count > 0)
{
var codeBlock = regionStack.Pop();
var startLine = snapshot.GetLineNumberFromPosition(codeBlock.Start);
if (snapshot.LineCount - startLine >= _minLinesToOutline)
{
newRegions.Add(OutlineRegion.FromBounds(snapshot.TextBuffer, codeBlock.Start, snapshot.Length));
}
}
}