/// <summary>
/// Validates that the sections are sorted correctly, and that they are not overlapping.
/// </summary>
/// <seealso cref="Sections"/>
public void ValidateInvariants()
{
var line = this;
int lineStartOffset = line.DocumentLine.Offset;
int lineEndOffset = line.DocumentLine.EndOffset;
for (int i = 0; i < line.Sections.Count; i++)
{
HighlightedSection s1 = line.Sections[i];
if (s1.Offset < lineStartOffset || s1.Length < 0 || s1.Offset + s1.Length > lineEndOffset)
{
throw new InvalidOperationException("Section is outside line bounds");
}
for (int j = i + 1; j < line.Sections.Count; j++)
{
HighlightedSection s2 = line.Sections[j];
if (s2.Offset >= s1.Offset + s1.Length)
{
// s2 is after s1
}
else if (s2.Offset >= s1.Offset && s2.Offset + s2.Length <= s1.Offset + s1.Length)
{
// s2 is nested within s1
}
else
{
throw new InvalidOperationException("Sections are overlapping or incorrectly sorted.");
}
}
}
}
void PushColor(HighlightingColor color)
{
if (highlightedLine == null)
{
return;
}
if (color == null)
{
highlightedSectionStack.Push(null);
}
else if (lastPoppedSection != null && lastPoppedSection.Color == color &&
lastPoppedSection.Offset + lastPoppedSection.Length == position + lineStartOffset)
{
highlightedSectionStack.Push(lastPoppedSection);
lastPoppedSection = null;
}
else
{
HighlightedSection hs = new HighlightedSection {
Offset = position + lineStartOffset,
Color = color
};
highlightedLine.Sections.Add(hs);
highlightedSectionStack.Push(hs);
lastPoppedSection = null;
}
}
/// <summary>
/// Writes a part of the highlighted line to the RichTextWriter.
/// </summary>
internal void WriteTo(RichTextWriter writer, int startOffset, int endOffset)
{
if (writer == null)
{
throw new ArgumentNullException("writer");
}
int documentLineStartOffset = this.DocumentLine.Offset;
int documentLineEndOffset = documentLineStartOffset + this.DocumentLine.Length;
if (startOffset < documentLineStartOffset || startOffset > documentLineEndOffset)
{
throw new ArgumentOutOfRangeException("startOffset", startOffset, "Value must be between " + documentLineStartOffset + " and " + documentLineEndOffset);
}
if (endOffset < startOffset || endOffset > documentLineEndOffset)
{
throw new ArgumentOutOfRangeException("endOffset", endOffset, "Value must be between startOffset and " + documentLineEndOffset);
}
ISegment requestedSegment = new SimpleSegment(startOffset, endOffset - startOffset);
List <HtmlElement> elements = new List <HtmlElement>();
for (int i = 0; i < this.Sections.Count; i++)
{
HighlightedSection s = this.Sections[i];
if (SimpleSegment.GetOverlap(s, requestedSegment).Length > 0)
{
elements.Add(new HtmlElement(s.Offset, i, false, s.Color));
elements.Add(new HtmlElement(s.Offset + s.Length, i, true, s.Color));
}
}
elements.Sort();
IDocument document = this.Document;
int textOffset = startOffset;
foreach (HtmlElement e in elements)
{
int newOffset = Math.Min(e.Offset, endOffset);
if (newOffset > startOffset)
{
document.WriteTextTo(writer, textOffset, newOffset - textOffset);
}
textOffset = Math.Max(textOffset, newOffset);
if (e.IsEnd)
{
writer.EndSpan();
}
else
{
writer.BeginSpan(e.Color);
}
}
document.WriteTextTo(writer, textOffset, endOffset - textOffset);
}
void ResetColorStack()
{
Debug.Assert(position == 0);
lastPoppedSection = null;
if (highlightedLine == null)
{
highlightedSectionStack = null;
}
else
{
highlightedSectionStack = new Stack <HighlightedSection>();
foreach (HighlightingSpan span in spanStack.Reverse())
{
PushColor(span.SpanColor);
}
}
}
void PopColor()
{
if (highlightedLine == null)
{
return;
}
HighlightedSection s = highlightedSectionStack.Pop();
if (s != null)
{
s.Length = (position + lineStartOffset) - s.Offset;
if (s.Length == 0)
{
highlightedLine.Sections.Remove(s);
}
else
{
lastPoppedSection = s;
}
}
}
/// <summary>
/// Merges the additional line into this line.
/// </summary>
public void MergeWith(HighlightedLine additionalLine)
{
if (additionalLine == null)
{
return;
}
#if DEBUG
ValidateInvariants();
additionalLine.ValidateInvariants();
#endif
int pos = 0;
Stack <int> activeSectionEndOffsets = new Stack <int>();
int lineEndOffset = this.DocumentLine.EndOffset;
activeSectionEndOffsets.Push(lineEndOffset);
foreach (HighlightedSection newSection in additionalLine.Sections)
{
int newSectionStart = newSection.Offset;
// Track the existing sections using the stack, up to the point where
// we need to insert the first part of the newSection
while (pos < this.Sections.Count)
{
HighlightedSection s = this.Sections[pos];
if (newSection.Offset < s.Offset)
{
break;
}
while (s.Offset > activeSectionEndOffsets.Peek())
{
activeSectionEndOffsets.Pop();
}
activeSectionEndOffsets.Push(s.Offset + s.Length);
pos++;
}
// Now insert the new section
// Create a copy of the stack so that we can track the sections we traverse
// during the insertion process:
Stack <int> insertionStack = new Stack <int>(activeSectionEndOffsets.Reverse());
// The stack enumerator reverses the order of the elements, so we call Reverse() to restore
// the original order.
int i;
for (i = pos; i < this.Sections.Count; i++)
{
HighlightedSection s = this.Sections[i];
if (newSection.Offset + newSection.Length <= s.Offset)
{
break;
}
// Insert a segment in front of s:
Insert(ref i, ref newSectionStart, s.Offset, newSection.Color, insertionStack);
while (s.Offset > insertionStack.Peek())
{
insertionStack.Pop();
}
insertionStack.Push(s.Offset + s.Length);
}
Insert(ref i, ref newSectionStart, newSection.Offset + newSection.Length, newSection.Color, insertionStack);
}
#if DEBUG
ValidateInvariants();
#endif
}