private BlockState TryOpen(BlockProcessor processor, bool isContinue)
{
// We expect footnote to appear only at document level and not indented more than a code indent block
var currentContainer = processor.GetCurrentContainerOpened();
if (processor.IsCodeIndent || (!isContinue && currentContainer.GetType() != typeof(MarkdownDocument)) || (isContinue && !(currentContainer is FootnoteGroup)))
{
return(BlockState.None);
}
var saved = processor.Column;
string label;
int start = processor.Start;
SourceSpan labelSpan;
if (!LinkHelper.TryParseLabel(ref processor.Line, false, out label, out labelSpan) || !label.StartsWith("^") || processor.CurrentChar != ':')
{
processor.GoToColumn(saved);
return(BlockState.None);
}
// Advance the column
int deltaColumn = processor.Start - start;
processor.Column = processor.Column + deltaColumn;
processor.NextChar(); // Skip ':'
var footnote = new Footnote(this)
{
Label = label,
LabelSpan = labelSpan,
};
// Maintain a list of all footnotes at document level
var footnotes = processor.Document.GetData(DocumentKey) as FootnoteGroup;
if (footnotes == null)
{
footnotes = new FootnoteGroup(this);
processor.Document.Add(footnotes);
processor.Document.SetData(DocumentKey, footnotes);
processor.Document.ProcessInlinesEnd += Document_ProcessInlinesEnd;
}
footnotes.Add(footnote);
var linkRef = new FootnoteLinkReferenceDefinition()
{
Footnote = footnote,
CreateLinkInline = CreateLinkToFootnote,
Line = processor.LineIndex,
Span = new SourceSpan(start, processor.Start - 2), // account for ]:
LabelSpan = labelSpan,
Label = label
};
processor.Document.SetLinkReferenceDefinition(footnote.Label, linkRef);
processor.NewBlocks.Push(footnote);
return(BlockState.Continue);
}