/// <summary>
/// Tries to continue matching a block already opened.
/// </summary>
/// <param name="processor">The parser processor.</param>
/// <param name="block">The block already opened.</param>
/// <returns>The result of the match. By default, don't expect any newline</returns>
public override BlockState TryContinue(BlockProcessor processor, Block block)
{
// Determine if we have a closing fence.
// It can start or end with either <c>---</c> or <c>...</c>
var line = processor.Line;
var c = line.CurrentChar;
if (processor.Column == 0 && (c == '-' || c == '.'))
{
int count = line.CountAndSkipChar(c);
c = line.CurrentChar;
// If we have a closing fence, close it and discard the current line
// The line must contain only fence characters and optional following whitespace.
if (count == 3 && !processor.IsCodeIndent && (c == '\0' || c.IsWhitespace()) && line.TrimEnd())
{
block.UpdateSpanEnd(line.Start - 1);
// Don't keep the last line
return(BlockState.BreakDiscard);
}
}
// Reset the indentation to the column before the indent
processor.GoToColumn(processor.ColumnBeforeIndent);
return(BlockState.Continue);
}
public override BlockState TryContinue(
BlockProcessor processor,
Block block)
{
var fence = (IFencedBlock)block;
var count = fence.FencedCharCount;
var matchChar = fence.FencedChar;
var c = processor.CurrentChar;
// Match if we have a closing fence
var line = processor.Line;
while (c == matchChar)
{
c = line.NextChar();
count--;
}
// If we have a closing fence, close it and discard the current line
// The line must contain only fence opening character followed only by whitespaces.
if (count <= 0 && !processor.IsCodeIndent && (c == '\0' || c.IsWhitespace()) && line.TrimEnd())
{
block.UpdateSpanEnd(line.Start - 1);
// Don't keep the last line
return(BlockState.BreakDiscard);
}
// Reset the indentation to the column before the indent
processor.GoToColumn(processor.ColumnBeforeIndent);
return(BlockState.Continue);
}
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);
}
public override BlockState TryContinue(BlockProcessor processor, Block block)
{
var figure = (Figure)block;
var count = figure.OpeningCharacterCount;
var matchChar = figure.OpeningCharacter;
var c = processor.CurrentChar;
var column = processor.Column;
// Match if we have a closing fence
var line = processor.Line;
var startPosition = line.Start;
while (c == matchChar)
{
c = line.NextChar();
count--;
}
// If we have a closing fence, close it and discard the current line
// The line must contain only fence opening character followed only by whitespaces.
if (count <= 0 && !processor.IsCodeIndent)
{
line.TrimStart();
if (!line.IsEmpty)
{
var caption = new FigureCaption(this)
{
Span = new SourceSpan(line.Start, line.End),
Line = processor.LineIndex,
Column = column + line.Start - startPosition,
IsOpen = false
};
caption.AppendLine(ref line, caption.Column, processor.LineIndex, processor.CurrentLineStartPosition);
figure.Add(caption);
}
figure.Span.End = line.End;
// Don't keep the last line
return(BlockState.BreakDiscard);
}
// Reset the indentation to the column before the indent
processor.GoToColumn(processor.ColumnBeforeIndent);
figure.Span.End = line.End;
return(BlockState.Continue);
}
/// <summary>
/// 继续解析全部代码块。
/// </summary>
/// <param name="processor">代码块进程。</param>
/// <param name="block">当前块实例对象。</param>
/// <returns>返回读取的状态。</returns>
public override BlockState TryContinue(BlockProcessor processor, Block block)
{
if (processor.IsCodeIndent)
{
return(BlockState.None);
}
var quote = (QuoteSectionNoteBlock)block;
var column = processor.Column;
if (quote.QuoteType == QuoteSectionNoteType.DFMVideo)
{
return(BlockState.BreakDiscard);
}
var c = processor.CurrentChar;
if (c != quote.QuoteChar)
{
return(processor.IsBlankLine ? BlockState.BreakDiscard : BlockState.None);
}
c = processor.NextChar(); // Skip opening char
if (c.IsSpace())
{
processor.NextChar(); // Skip following space
}
// Check for New DFM block
if (TryParseFromLine(processor, new QuoteSectionNoteBlock(this)))
{
// Meet note or section, close this block, new block will be open in the next steps
processor.GoToColumn(column);
return(BlockState.None);
}
else
{
block.UpdateSpanEnd(processor.Line.End);
return(BlockState.Continue);
}
}
/// <summary>
/// Overrides the TryOpen for the heading block parser to ignore the need for spaces
/// </summary>
/// <returns>The open.</returns>
/// <param name="processor">Processor.</param>
public override BlockState TryOpen(BlockProcessor processor)
{
// If we are in a CodeIndent, early exit
if (processor.IsCodeIndent)
{
return(BlockState.None);
}
// 4.2 ATX headings
// An ATX heading consists of a string of characters, parsed as inline content,
// between an opening sequence of 1–6 unescaped # characters and an optional
// closing sequence of any number of unescaped # characters. The opening sequence
// of # characters must be followed by a space or by the end of line. The optional
// closing sequence of #s must be preceded by a space and may be followed by spaces
// only. The opening # character may be indented 0-3 spaces. The raw contents of
// the heading are stripped of leading and trailing spaces before being parsed as
// inline content. The heading level is equal to the number of # characters in the
// opening sequence.
// We are not doing this ^^ we don't have the spaces... so we need to handle that adjusted logic here
var column = processor.Column;
var line = processor.Line;
var sourcePosition = line.Start;
var c = line.CurrentChar;
var matchingChar = c;
int leadingCount = 0;
// get how many of the headChar we have and limit to 6 (h6 is the last handled header)
while (c == _headChar && leadingCount <= 6)
{
if (c != matchingChar)
{
break;
}
c = line.NextChar();
leadingCount++;
}
// A space is NOT required after leading #
if (leadingCount > 0 && leadingCount <= 6)
{
// Move to the content
var headingBlock = new HeadingBlock(this)
{
HeaderChar = matchingChar,
Level = leadingCount,
Column = column,
Span = { Start = sourcePosition }
};
processor.NewBlocks.Push(headingBlock);
processor.GoToColumn(column + leadingCount); // no +1 - skip the space
// Gives a chance to parse attributes
if (TryParseAttributes != null)
{
TryParseAttributes(processor, ref processor.Line, headingBlock);
}
// The optional closing sequence of #s must not be preceded by a space and may be followed by spaces only.
int endState = 0;
int countClosingTags = 0;
for (int i = processor.Line.End; i >= processor.Line.Start; i--) // Go up to Start in order to match the no space after the first ###
{
c = processor.Line.Text[i];
if (endState == 0)
{
if (c.IsSpaceOrTab())
{
continue;
}
endState = 1;
}
if (endState == 1)
{
if (c == matchingChar)
{
countClosingTags++;
continue;
}
if (countClosingTags > 0)
{
if (c.IsSpaceOrTab())
{
processor.Line.End = i - 1;
}
break;
}
else
{
break;
}
}
}
// Setup the source end position of this element
headingBlock.Span.End = processor.Line.End;
// We expect a single line, so don't continue
return(BlockState.Break);
}
// Else we don't have an header
return(BlockState.None);
}
public override BlockState TryOpen(BlockProcessor processor)
{
var paragraphBlock = processor.LastBlock as ParagraphBlock;
if (processor.IsCodeIndent || paragraphBlock == null || paragraphBlock.LastLine - processor.LineIndex > 1)
{
return(BlockState.None);
}
var startPosition = processor.Start;
var column = processor.ColumnBeforeIndent;
processor.NextChar();
processor.ParseIndent();
var delta = processor.Column - column;
// We expect to have a least
if (delta < 4)
{
// Return back to original position
processor.GoToColumn(column);
return(BlockState.None);
}
if (delta > 4)
{
processor.GoToColumn(column + 4);
}
var previousParent = paragraphBlock.Parent;
var currentDefinitionList = GetCurrentDefinitionList(paragraphBlock, previousParent);
processor.Discard(paragraphBlock);
// If the paragraph block was not part of the opened blocks, we need to remove it manually from its parent container
if (paragraphBlock.Parent != null)
{
paragraphBlock.Parent.Remove(paragraphBlock);
}
if (currentDefinitionList == null)
{
currentDefinitionList = new DefinitionList(this)
{
Span = new SourceSpan(paragraphBlock.Span.Start, processor.Line.End),
Column = paragraphBlock.Column,
Line = paragraphBlock.Line,
};
previousParent.Add(currentDefinitionList);
}
var definitionItem = new DefinitionItem(this)
{
Line = processor.LineIndex,
Column = column,
Span = new SourceSpan(startPosition, processor.Line.End),
OpeningCharacter = processor.CurrentChar,
};
for (int i = 0; i < paragraphBlock.Lines.Count; i++)
{
var line = paragraphBlock.Lines.Lines[i];
var term = new DefinitionTerm(this)
{
Column = paragraphBlock.Column,
Line = line.Line,
Span = new SourceSpan(paragraphBlock.Span.Start, paragraphBlock.Span.End),
IsOpen = false
};
term.AppendLine(ref line.Slice, line.Column, line.Line, line.Position);
definitionItem.Add(term);
}
currentDefinitionList.Add(definitionItem);
processor.Open(definitionItem);
// Update the end position
currentDefinitionList.UpdateSpanEnd(processor.Line.End);
return(BlockState.Continue);
}
public override BlockState TryContinue(BlockProcessor processor, Block block)
{
var definitionItem = (DefinitionItem)block;
if (processor.IsCodeIndent)
{
processor.GoToCodeIndent();
return(BlockState.Continue);
}
var list = (DefinitionList)definitionItem.Parent;
var lastBlankLine = definitionItem.LastChild as BlankLineBlock;
// Check if we have another definition list
if (Array.IndexOf(OpeningCharacters, processor.CurrentChar) >= 0)
{
var startPosition = processor.Start;
var column = processor.ColumnBeforeIndent;
processor.NextChar();
processor.ParseIndent();
var delta = processor.Column - column;
// We expect to have a least
if (delta < 4)
{
// Remove the blankline before breaking this definition item
if (lastBlankLine != null)
{
definitionItem.RemoveAt(definitionItem.Count - 1);
}
list.Span.End = list.LastChild.Span.End;
return(BlockState.None);
}
if (delta > 4)
{
processor.GoToColumn(column + 4);
}
processor.Close(definitionItem);
var nextDefinitionItem = new DefinitionItem(this)
{
Span = new SourceSpan(startPosition, processor.Line.End),
Line = processor.LineIndex,
Column = processor.Column,
OpeningCharacter = processor.CurrentChar,
};
list.Add(nextDefinitionItem);
processor.Open(nextDefinitionItem);
return(BlockState.Continue);
}
var isBreakable = definitionItem.LastChild?.IsBreakable ?? true;
if (processor.IsBlankLine)
{
if (lastBlankLine == null && isBreakable)
{
definitionItem.Add(new BlankLineBlock());
}
return(isBreakable ? BlockState.ContinueDiscard : BlockState.Continue);
}
var paragraphBlock = definitionItem.LastChild as ParagraphBlock;
if (lastBlankLine == null && paragraphBlock != null)
{
return(BlockState.Continue);
}
// Remove the blankline before breaking this definition item
if (lastBlankLine != null)
{
definitionItem.RemoveAt(definitionItem.Count - 1);
}
list.Span.End = list.LastChild.Span.End;
return(BlockState.Break);
}
public static void ResetLineIndent(BlockProcessor processor)
{
processor.GoToColumn(processor.ColumnBeforeIndent);
}
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);
}
// Subtracts opening fence indent from current line indent
internal virtual void UpdateLineStart(BlockProcessor blockProcessor, TProxy block)
{
blockProcessor.GoToColumn(blockProcessor.ColumnBeforeIndent + Math.Min(block.OpeningFenceIndent, blockProcessor.Indent));
}