/// <summary>
/// 尝试解析当前字符串。
/// </summary>
/// <param name="processor">代码块进程。</param>
/// <returns>返回代码块状态。</returns>
public override BlockState TryOpen(BlockProcessor processor)
{
if (processor.IsCodeIndent)
{
return(BlockState.None);
}
var column = processor.Column;
var sourcePosition = processor.Start;
var quoteChar = processor.CurrentChar;
var c = processor.NextChar();
if (c.IsSpaceOrTab())
{
processor.NextColumn();
}
var rawNewBlock = new QuoteSectionNoteBlock(this)
{
Line = processor.LineIndex,
QuoteChar = quoteChar,
Column = column,
Span = new SourceSpan(sourcePosition, processor.Line.End),
};
TryParseFromLine(processor, rawNewBlock);
processor.NewBlocks.Push(rawNewBlock);
if (rawNewBlock.QuoteType == QuoteSectionNoteType.DFMVideo)
{
return(BlockState.BreakDiscard);
}
else
{
return(BlockState.Continue);
}
}
private bool TryParseFromLine(BlockProcessor processor, QuoteSectionNoteBlock block)
{
int originalColumn = processor.Column;
block.QuoteType = QuoteSectionNoteType.MarkdownQuote;
if (processor.CurrentChar != '[')
{
return(false);
}
var stringBuilder = StringBuilderCache.Local();
var c = processor.CurrentChar;
var hasEscape = false;
while (c != '\0' && (c != ']' || hasEscape))
{
if (c == '\\' && !hasEscape)
{
hasEscape = true;
}
else
{
stringBuilder.Append(c);
hasEscape = false;
}
c = processor.NextChar();
}
stringBuilder.Append(c);
var infoString = stringBuilder.ToString().Trim();
if (c == '\0')
{
processor.GoToColumn(originalColumn);
return(false);
}
if (c == ']')
{
// "> [!NOTE] content" is invalid, go to end to see it.
processor.NextChar();
while (processor.CurrentChar.IsSpaceOrTab())
{
processor.NextChar();
}
var isNoteVideoDiv = infoString.StartsWith("[!div", StringComparison.OrdinalIgnoreCase) ||
infoString.StartsWith("[!Video", StringComparison.OrdinalIgnoreCase) ||
SectionNoteType.IsNoteType(infoString);
if (processor.CurrentChar != '\0' && isNoteVideoDiv)
{
processor.GoToColumn(originalColumn);
return(false);
}
}
if (SectionNoteType.IsNoteType(infoString))
{
block.QuoteType = QuoteSectionNoteType.DFMNote;
block.NoteTypeString = infoString.Substring(2, infoString.Length - 3).ToLowerInvariant();
return(true);
}
if (infoString.StartsWith("[!div", StringComparison.OrdinalIgnoreCase))
{
block.QuoteType = QuoteSectionNoteType.DFMSection;
string attribute = infoString.Substring(5, infoString.Length - 6).Trim();
if (attribute.Length >= 2 && attribute.First() == '`' && attribute.Last() == '`')
{
block.SectionAttributeString = attribute.Substring(1, attribute.Length - 2).Trim();
}
if (attribute.Length >= 1 && attribute.First() != '`' && attribute.Last() != '`')
{
block.SectionAttributeString = attribute;
}
return(true);
}
if (infoString.StartsWith("[!Video", StringComparison.OrdinalIgnoreCase))
{
string link = infoString.Substring(7, infoString.Length - 8);
if (link.StartsWith(" http://") || link.StartsWith(" https://"))
{
block.QuoteType = QuoteSectionNoteType.DFMVideo;
block.VideoLink = link.Trim();
return(true);
}
}
processor.GoToColumn(originalColumn);
return(false);
}