/// <summary>
/// Convert a Markdown element to a Forkdown one.
/// </summary>
/// <param name="mdo">Markdown object to convert.</param>
public static Element ToForkdown(IMarkdownObject mdo)
{
Element result = mdo switch {
MarkdownDocument _ => new Document(),
HeadingBlock h => new Heading(h),
ListBlock l => new Listing(l),
ListItemBlock li => new ListItem(li),
ParagraphBlock p => new Paragraph(p),
CustomContainer c => new Section(c),
CustomContainerInline c => new ExplicitInlineContainer(c),
CodeInline c => new Code(c),
FencedCodeBlock c => new CodeBlock(c),
LinkInline l => new Link(l),
LiteralInline t => new Text(t),
LineBreakInline _ => new LineBreak(),
ThematicBreakBlock _ => new Separator(),
Tables.Table t => new Table(t),
Tables.TableRow tr => new TableRow(tr),
Tables.TableCell tc => new TableCell(tc),
EmphasisInline e => new Emphasis(e),
HtmlBlock b => new Html(b),
_ => new Placeholder(mdo),
};
var subs = mdo switch {
LeafBlock b => b.Inline,
IEnumerable <MarkdownObject> e => e,
_ => null
} ?? Nil.E <MarkdownObject>();
public override bool Match(InlineProcessor processor, ref StringSlice slice)
{
var startPosition = slice.Start;
// Go to escape character
var c = slice.NextChar();
int line;
int column;
if (c.IsAsciiPunctuation())
{
processor.Inline = new LiteralInline()
{
Content = new StringSlice(slice.Text, slice.Start, slice.Start),
Span = { Start = processor.GetSourcePosition(startPosition, out line, out column) },
Line = line,
Column = column,
IsFirstCharacterEscaped = true,
};
processor.Inline.Span.End = processor.Inline.Span.Start + 1;
slice.SkipChar();
return(true);
}
// A backslash at the end of the line is a [hard line break]:
if (c == '\n' || c == '\r')
{
var newLine = c == '\n' ? NewLine.LineFeed : NewLine.CarriageReturn;
if (c == '\r' && slice.PeekChar() == '\n')
{
newLine = NewLine.CarriageReturnLineFeed;
}
var inline = new LineBreakInline()
{
IsHard = true,
IsBackslash = true,
Span = { Start = processor.GetSourcePosition(startPosition, out line, out column) },
Line = line,
Column = column,
};
processor.Inline = inline;
if (processor.TrackTrivia)
{
inline.NewLine = newLine;
}
inline.Span.End = inline.Span.Start + 1;
slice.SkipChar(); // Skip \n or \r alone
if (newLine == NewLine.CarriageReturnLineFeed)
{
slice.SkipChar(); // Skip \r\n
}
return(true);
}
return(false);
}
private OpenXmlElement[] ConvertLineBreakInline(LineBreakInline lineBreakInline)
{
if (lineBreakInline.IsHard)
{
return(new OpenXmlElement[] { Manipulator.ElementCreator.CreateBreakElement() });
}
return(new OpenXmlElement[] { });
}
public void Setup()
{
document = new Document();
// Workaround for a quirk in the migradoc API.
_ = document.AddSection().Elements;
pdfBuilder = new PdfBuilder(document, PdfOptions.Default);
renderer = new LineBreakInlineRenderer();
inline = new LineBreakInline();
inline.IsHard = true;
}
protected override void Write(RoundtripRenderer renderer, QuoteBlock quoteBlock)
{
renderer.RenderLinesBefore(quoteBlock);
renderer.Write(quoteBlock.TriviaBefore);
var indents = new string[quoteBlock.QuoteLines.Count];
for (int i = 0; i < quoteBlock.QuoteLines.Count; i++)
{
var quoteLine = quoteBlock.QuoteLines[i];
var wsb = quoteLine.TriviaBefore.ToString();
var quoteChar = quoteLine.QuoteChar ? ">" : "";
var spaceAfterQuoteChar = quoteLine.HasSpaceAfterQuoteChar ? " " : "";
var wsa = quoteLine.TriviaAfter.ToString();
indents[i] = (wsb + quoteChar + spaceAfterQuoteChar + wsa);
}
bool noChildren = false;
if (quoteBlock.Count == 0)
{
noChildren = true;
// since this QuoteBlock instance has no children, indents will not be rendered. We
// work around this by adding empty LineBreakInlines to a ParagraphBlock.
// Wanted: a more elegant/better solution (although this is not *that* bad).
foreach (var quoteLine in quoteBlock.QuoteLines)
{
var emptyLeafBlock = new ParagraphBlock
{
NewLine = quoteLine.NewLine
};
var newLine = new LineBreakInline
{
NewLine = quoteLine.NewLine
};
var container = new ContainerInline();
container.AppendChild(newLine);
emptyLeafBlock.Inline = container;
quoteBlock.Add(emptyLeafBlock);
}
}
renderer.PushIndent(indents);
renderer.WriteChildren(quoteBlock);
renderer.PopIndent();
if (!noChildren)
{
renderer.RenderLinesAfter(quoteBlock);
}
}
public bool PostProcess(InlineProcessor state, Inline root, Inline lastChild, int postInlineProcessorIndex, bool isFinalProcessing)
{
var container = root as ContainerInline;
var tableState = state.ParserStates[Index] as TableState;
// If the delimiters are being processed by an image link, we need to transform them back to literals
if (!isFinalProcessing)
{
if (container == null || tableState == null)
{
return(true);
}
var child = container.LastChild;
List <PipeTableDelimiterInline> delimitersToRemove = null;
while (child != null)
{
var pipeDelimiter = child as PipeTableDelimiterInline;
if (pipeDelimiter != null)
{
if (delimitersToRemove == null)
{
delimitersToRemove = new List <PipeTableDelimiterInline>();
}
delimitersToRemove.Add(pipeDelimiter);
}
if (child == lastChild)
{
break;
}
var subContainer = child as ContainerInline;
child = subContainer?.LastChild;
}
// If we have found any delimiters, transform them to literals
if (delimitersToRemove != null)
{
bool leftIsDelimiter = false;
bool rightIsDelimiter = false;
for (int i = 0; i < delimitersToRemove.Count; i++)
{
var pipeDelimiter = delimitersToRemove[i];
pipeDelimiter.ReplaceByLiteral();
// Check that the pipe that is being removed is not going to make a line without pipe delimiters
var tableDelimiters = tableState.ColumnAndLineDelimiters;
var delimiterIndex = tableDelimiters.IndexOf(pipeDelimiter);
if (i == 0)
{
leftIsDelimiter = delimiterIndex > 0 && tableDelimiters[delimiterIndex - 1] is PipeTableDelimiterInline;
}
else if (i + 1 == delimitersToRemove.Count)
{
rightIsDelimiter = delimiterIndex + 1 < tableDelimiters.Count &&
tableDelimiters[delimiterIndex + 1] is PipeTableDelimiterInline;
}
// Remove this delimiter from the table processor
tableState.ColumnAndLineDelimiters.Remove(pipeDelimiter);
}
// If we didn't have any delimiter before and after the delimiters we jsut removed, we mark the processor of the current line as no pipe
if (!leftIsDelimiter && !rightIsDelimiter)
{
tableState.LineHasPipe = false;
}
}
return(true);
}
// Remove previous state
state.ParserStates[Index] = null;
// Continue
if (tableState == null || container == null || tableState.IsInvalidTable || !tableState.LineHasPipe) //|| tableState.LineIndex != state.LocalLineIndex)
{
return(true);
}
// Detect the header row
var delimiters = tableState.ColumnAndLineDelimiters;
// TODO: we could optimize this by merging FindHeaderRow and the cell loop
var aligns = FindHeaderRow(delimiters);
if (Options.RequireHeaderSeparator && aligns == null)
{
return(true);
}
var table = new Table();
// If the current paragraph block has any attributes attached, we can copy them
var attributes = state.Block.TryGetAttributes();
if (attributes != null)
{
attributes.CopyTo(table.GetAttributes());
}
state.BlockNew = table;
var cells = tableState.Cells;
cells.Clear();
//delimiters[0].DumpTo(state.DebugLog);
// delimiters contain a list of `|` and `\n` delimiters
// The `|` delimiters are created as child containers.
// So the following:
// | a | b \n
// | d | e \n
//
// Will generate a tree of the following node:
// |
// a
// |
// b
// \n
// |
// d
// |
// e
// \n
// When parsing delimiters, we need to recover whether a row is of the following form:
// 0) | a | b | \n
// 1) | a | b \n
// 2) a | b \n
// 3) a | b | \n
// If the last element is not a line break, add a line break to homogenize parsing in the next loop
var lastElement = delimiters[delimiters.Count - 1];
if (!(lastElement is LineBreakInline))
{
while (true)
{
if (lastElement is ContainerInline)
{
var nextElement = ((ContainerInline)lastElement).LastChild;
if (nextElement != null)
{
lastElement = nextElement;
continue;
}
}
break;
}
var endOfTable = new LineBreakInline();
lastElement.InsertAfter(endOfTable);
delimiters.Add(endOfTable);
tableState.EndOfLines.Add(endOfTable);
}
// Cell loop
// Reconstruct the table from the delimiters
TableRow row = null;
TableRow firstRow = null;
for (int i = 0; i < delimiters.Count; i++)
{
var delimiter = delimiters[i];
var pipeSeparator = delimiter as PipeTableDelimiterInline;
var isLine = delimiter is LineBreakInline;
if (row == null)
{
row = new TableRow();
if (firstRow == null)
{
firstRow = row;
}
// If the first delimiter is a pipe and doesn't have any parent or previous sibling, for cases like:
// 0) | a | b | \n
// 1) | a | b \n
if (pipeSeparator != null && (delimiter.PreviousSibling == null || delimiter.PreviousSibling is LineBreakInline))
{
delimiter.Remove();
continue;
}
}
// We need to find the beginning/ending of a cell from a right delimiter. From the delimiter 'x', we need to find a (without the delimiter start `|`)
// So we iterate back to the first pipe or line break
// x
// 1) | a | b \n
// 2) a | b \n
Inline endOfCell = null;
Inline beginOfCell = null;
var cellContentIt = delimiter;
while (true)
{
cellContentIt = cellContentIt.PreviousSibling ?? cellContentIt.Parent;
if (cellContentIt == null || cellContentIt is LineBreakInline)
{
break;
}
// The cell begins at the first effective child after a | or the top ContainerInline (which is not necessary to bring into the tree + it contains an invalid span calculation)
if (cellContentIt is PipeTableDelimiterInline || (cellContentIt.GetType() == typeof(ContainerInline) && cellContentIt.Parent == null))
{
beginOfCell = ((ContainerInline)cellContentIt).FirstChild;
if (endOfCell == null)
{
endOfCell = beginOfCell;
}
break;
}
beginOfCell = cellContentIt;
if (endOfCell == null)
{
endOfCell = beginOfCell;
}
}
// If the current deilimiter is a pipe `|` OR
// the beginOfCell/endOfCell are not null and
// either they are :
// - different
// - they contain a single element, but it is not a line break (\n) or an empty/whitespace Literal.
// Then we can add a cell to the current row
if (!isLine || (beginOfCell != null && endOfCell != null && (beginOfCell != endOfCell || !(beginOfCell is LineBreakInline || (beginOfCell is LiteralInline && ((LiteralInline)beginOfCell).Content.IsEmptyOrWhitespace())))))
{
if (!isLine)
{
// If the delimiter is a pipe, we need to remove it from the tree
// so that previous loop looking for a parent will not go further on subsequent cells
delimiter.Remove();
}
// We trim whitespace at the beginning and ending of the cell
TrimStart(beginOfCell);
TrimEnd(endOfCell);
var cellContainer = new ContainerInline();
// Copy elements from beginOfCell on the first level
var cellIt = beginOfCell;
while (cellIt != null && !IsLine(cellIt) && !(cellIt is PipeTableDelimiterInline))
{
var nextSibling = cellIt.NextSibling;
cellIt.Remove();
if (cellContainer.Span.IsEmpty)
{
cellContainer.Line = cellIt.Line;
cellContainer.Column = cellIt.Column;
cellContainer.Span = cellIt.Span;
}
cellContainer.AppendChild(cellIt);
cellContainer.Span.End = cellIt.Span.End;
cellIt = nextSibling;
}
// Create the cell and add it to the pending row
var tableParagraph = new ParagraphBlock()
{
Span = cellContainer.Span,
Line = cellContainer.Line,
Column = cellContainer.Column,
Inline = cellContainer
};
var tableCell = new TableCell()
{
Span = cellContainer.Span,
Line = cellContainer.Line,
Column = cellContainer.Column,
};
tableCell.Add(tableParagraph);
if (row.Span.IsEmpty)
{
row.Span = cellContainer.Span;
row.Line = cellContainer.Line;
row.Column = cellContainer.Column;
}
row.Add(tableCell);
cells.Add(tableCell);
}
// If we have a new line, we can add the row
if (isLine)
{
Debug.Assert(row != null);
if (table.Span.IsEmpty)
{
table.Span = row.Span;
table.Line = row.Line;
table.Column = row.Column;
}
table.Add(row);
row = null;
}
}
// Once we are done with the cells, we can remove all end of lines in the table tree
foreach (var endOfLine in tableState.EndOfLines)
{
endOfLine.Remove();
}
// If we have a header row, we can remove it
// TODO: we could optimize this by merging FindHeaderRow and the previous loop
if (aligns != null)
{
table.RemoveAt(1);
var tableRow = (TableRow)table[0];
table.ColumnDefinitions.AddRange(aligns);
tableRow.IsHeader = true;
}
// Perform delimiter processor that are coming after this processor
foreach (var cell in cells)
{
var paragraph = (ParagraphBlock)cell[0];
state.PostProcessInlines(postInlineProcessorIndex + 1, paragraph.Inline, null, true);
}
// Clear cells when we are done
cells.Clear();
// We don't want to continue procesing delimiters, as we are already processing them here
return(false);
}
