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I'm trying to check if an offset is inside an offset and found some code for it on these forums, however it always returned false for it being highlighted so i decided to check what was wrong. The following code shows a messagebox with "0" printed in it

TextEditor te = ((TextEditors.SelectedItem as TabItem).Content as TextEditor);
HighlightedLine hline = new HighlightedLine(te.Document, te.Document.GetLineByOffset(te.SelectionStart));
MessageBox.Show(hline.Sections.Count.ToString());

even though im checking from a selection which is inside a multiline comment.

Here's what im doing inside my highlighting class

private bool IsInComment(int offset, DocumentLine line)
{
HighlightedLine hline = new HighlightedLine(CurrentContext.Document, line);
return (hline.Sections.Any(s => s.Offset <= offset && s.Offset + s.Length >= offset && s.Color.Name == "Comment"));
}

and it always return false, not supported anymore?

From the old post, here's the code again:

int off = document.GetOffset(7, 22);
HighlightedLine result = documentHighlighter.HighlightLine(document.GetLineByNumber(7));
bool isInComment = result.Sections.Any(s => s.Offset <= off && s.Offset+s.Length >= off && s.Color.Name == "Comment");

Note that it is not creating a new (empty) HighlightedLine, but asks the highlighting engine to create one. You can get a reference to the existing highlighting engine like this:

IHighlighter documentHighlighter = textEditor.TextArea.GetService(typeof(IHighlighter)) as IHighlighter;

Ohh, thats what i did wrong, but i just tried it and the example is not 100% correct, it should be

int off = document.GetOffset(7, 22);

IHighlighter documentHighlighter = textEditor.TextArea.GetService(typeof(IHighlighter)) as IHighlighter;
HighlightedLine result = documentHighlighter.HighlightLine(document.GetLineByNumber(7).LineNumber);
bool IsInComment = result.Sections.Any(s => s.Offset <= off && s.Offset + s.Length >= off && s.Color.Name == "Comment");

And thanks for your answer once again

edit: but it doesnt seem like i pass the IHighlighter on to my highlighter class, it only returns false there

Found the way to get it from the TextView so now i can access it from my DocumentColorizingTransformer

public bool IsInStringComment(int offset)
{
IHighlighter documentHighlighter = CurrentContext.TextView.Services.GetService(typeof(IHighlighter)) as IHighlighter;
HighlightedLine result = documentHighlighter.HighlightLine(CurrentContext.Document.GetLineByOffset(offset).LineNumber);
return result.Sections.Any(s => s.Offset <= offset && s.Offset + s.Length >= offset && (s.Color.Name == "Comment" || s.Color.Name == "String" || s.Color.Name == "Char"));
}