/// <summary>
/// Central routine of the folding strategy for markdown.
/// It uses the parsed syntax tree in <paramref name="markdownDocument"/> to calculate all folding positions.
/// </summary>
/// <param name="markdownDocument">The parsed syntax tree of the markdown document.</param>
/// <returns>Enumeration of foldings.</returns>
public virtual IEnumerable <NewFolding> GetNewFoldings(Markdig.Syntax.MarkdownDocument markdownDocument)
{
const int maxLevel = 4;
var newFoldMarkers = new List <NewFolding>();
if (markdownDocument != null)
{
// since we fold only the h1, h2, h3, h3 tags, they all are top level blocks
// thus there is no need to go down in the tree
var previousBlocks = new Markdig.Syntax.HeadingBlock[maxLevel + 1]; // +1 because heading.Level is one-based
for (int i = 0; i < markdownDocument.Count; ++i)
{
if (markdownDocument[i] is Markdig.Syntax.HeadingBlock heading && heading.Level <= maxLevel)
{
// A heading block will close all previous heading with the same level or any sublevel above
for (int j = heading.Level; j <= maxLevel; ++j)
{
if (null != previousBlocks[j])
{
newFoldMarkers.Add(new NewFolding(previousBlocks[j].Span.End + 1, markdownDocument[i - 1].Span.End + 1));
previousBlocks[j] = null; // the previous block is processed then
}
}
previousBlocks[heading.Level] = heading;
}
}
// after all blocks have been processed, we have to close the unfinished blocks
var end = markdownDocument.Span.End;
for (int i = 0; i < previousBlocks.Length; ++i)
{
if (null != previousBlocks[i])
{
newFoldMarkers.Add(new NewFolding(previousBlocks[i].Span.End + 1, markdownDocument.Span.End + 1));
}
}
}
return(newFoldMarkers.OrderBy(f => f.StartOffset));
}
public async Task <DocumentCacheResult> TryCache()
{
if (markdown != null)
{
return(DocumentCacheResult.Success);
}
while (readingCache)
{
await Task.Delay(5);
}
if (markdown != null)
{
return(DocumentCacheResult.Success);
}
readingCache = true;
try
{
using (var scope = _Services.CreateScope())
{
var httpClient = scope.ServiceProvider.GetRequiredService <HttpClient>();
var markdownPipeline = scope.ServiceProvider.GetRequiredService <MarkdownPipeline>();
markdown = Markdig.Markdown.Parse(await httpClient.GetStringAsync(Path), markdownPipeline);
}
} catch (HttpRequestException)
{
return(DocumentCacheResult.Offline);
} catch
{
return(DocumentCacheResult.Error);
} finally
{
readingCache = false;
}
return(DocumentCacheResult.Success);
}
internal PreviewRenderedEventArgs(Markdig.Syntax.MarkdownDocument document) : base()
{
this.Document = document;
}