private void EndElement(ParserContext context, IDocumentElement element)
{
var linkElement = element as ILinkElement;
switch (element.ElementType)
{
case ElementTypes.Container:
context.IsPreFormatted = false;
context.Template.AddElementClose();
context.Template.AddLineBreak();
break;
case ElementTypes.InlineText:
context.Template.AddElementClose();
break;
case ElementTypes.Heading:
case ElementTypes.Paragraph:
context.Template.AddElementClose();
context.Template.AddLineBreak();
break;
case ElementTypes.Link:
if (linkElement != null && linkElement.LinkType == LinkTypes.Reference)
{
context.Template.AddElementClose();
}
break;
}
}
public bool Write(IDocumentElement element)
{
switch (element.ElementType)
{
case ElementTypes.Document:
return(WriteDocument(element));
case ElementTypes.Break:
return(WriteBreak(element));
case ElementTypes.Container:
return(WriteContainer(element));
case ElementTypes.Heading:
return(WriteHeading(element));
case ElementTypes.InlineText:
return(WriteInlineText(element));
case ElementTypes.Link:
return(WriteLink(element));
case ElementTypes.Paragraph:
return(WriteParagraph(element));
}
var textElement = element as ITextElement;
if (textElement != null && !string.IsNullOrEmpty(textElement.Text))
{
_textWriter.Write(textElement.Text);
}
return(true);
}
private void CollapseLineBreaks(IDocumentElement element)
{
var nextIsLineBreak = false;
for (var i = element.Children.Count - 2; i >= 0; i--)
{
var current = element.Children[i] as IBreakElement;
if (current != null &&
current.BreakType == BreakTypes.LineBreak)
{
if (nextIsLineBreak)
{
element.Children.RemoveAt(i + 1);
}
else
{
var next = element.Children[i + 1] as IBreakElement;
if (next != null &&
next.BreakType == BreakTypes.LineBreak)
{
element.Children.RemoveAt(i + 1);
}
nextIsLineBreak = true;
}
}
else
{
i--;
nextIsLineBreak = false;
}
}
}
public void CleanDocument(IDocumentElement element, DocumentCleaning actions)
{
if (element == null || element.Children == null || element.Children.Count == 0)
{
return;
}
if ((actions & (DocumentCleaning.RemoveBlankLines | DocumentCleaning.MakeParagraphs)) != 0)
{
RemoveEmptyTextElements(element);
CollapseLineBreaks(element);
}
if (actions.HasFlag(DocumentCleaning.MakeParagraphs))
{
MakeParagraphs(element);
}
foreach (var child in element.Children)
{
CleanDocument(child, actions);
}
if (actions.HasFlag(DocumentCleaning.RemoveBlankLines))
{
RemoveEmptyContainers(element);
}
}
private bool WriteHeading(IDocumentElement element)
{
var nestedElement = element as INestedElement;
var headingLevel = 1;
if (nestedElement != null)
{
headingLevel = nestedElement.Level;
}
_characterStream.State = MarkdownStates.Heading;
_textWriter.EnsureBlankLine();
_textWriter.Write(new string('#', headingLevel));
_textWriter.Write(' ');
if (element.Children != null)
{
foreach (var child in element.Children)
{
Write(child);
}
}
_textWriter.EnsureNewLine();
return(true);
}
public void AddToParagraph(IDocumentElement elementToAdd)
{
Contract.Requires(elementToAdd != null);
Contract.Ensures(currentParagraph != null);
CreateParagraphIfNoneIsAlreadyOpen();
currentParagraph.AddChild(elementToAdd);
}
private string RenderMarkdown(IDocumentElement document)
{
var output = new StringBuilder();
using (var textWriter = new StringWriter(output))
{
_documentTransformer.FormatDocument("text/x-markdown", textWriter, document);
}
return(output.ToString());
}
private void MakeParagraphs(IDocumentElement element)
{
for (var i = element.Children.Count - 1; i >= 0; i--)
{
var lineBreak = element.Children[i] as IBreakElement;
{
if (lineBreak != null && lineBreak.BreakType == BreakTypes.LineBreak)
{
var first = i;
while (first > 0)
{
var textElement = element.Children[first - 1];
var linkElement = textElement as ILinkElement;
if (textElement.ElementType == ElementTypes.RawText ||
textElement.ElementType == ElementTypes.InlineText ||
(textElement.ElementType == ElementTypes.Link &&
linkElement != null &&
(linkElement.LinkType == LinkTypes.Reference || linkElement.LinkType == LinkTypes.Image))
)
{
first--;
}
else
{
break;
}
}
if (first == i)
{
continue;
}
var paragraph = new ParagraphElement
{
Parent = element,
Children = new List <IDocumentElement>()
};
element.Children[i] = paragraph;
for (var j = first; j < i; j++)
{
var childToMove = element.Children[first];
paragraph.Children.Add(childToMove);
childToMove.Parent = paragraph;
element.Children.RemoveAt(first);
}
i = first;
}
}
}
}
private void FixupChildren(IDocumentElement element)
{
if (element.Children != null)
{
foreach (var child in element.Children)
{
child.Parent = element;
FixupChildren(child);
}
}
}
private bool WriteDocument(IDocumentElement element)
{
if (element.Children != null)
{
foreach (var child in element.Children)
{
Write(child);
}
}
return(true);
}
private bool WriteLink(IDocumentElement element)
{
var linkElement = element as ILinkElement;
if (linkElement == null)
{
return(false);
}
_textWriter.Write(linkElement.LinkAddress);
return(true);
}
private T FindPriorElement <T>(IDocumentElement start, Func <T, bool> predicate) where T : Element
{
while (start != null)
{
var t = start as T;
if (t != null && predicate(t))
{
return(t);
}
start = start.Parent;
}
return(null);
}
private void Write(ParserContext context, IDocumentElement element)
{
BeginElement(context, element);
if (element.Children != null)
{
foreach (var child in element.Children)
{
Write(context, child);
}
}
EndElement(context, element);
}
public void Write(IDocumentElement element)
{
WriteElementBegin(element);
if (element.Children != null)
{
foreach (var child in element.Children)
{
Write(child);
}
}
WriteElementEnd(element);
}
public void CleanAttributes(IDocumentElement element, Func <IDocumentElement, string, string, bool> attributeFilter)
{
if (element == null || attributeFilter == null)
{
return;
}
if (element.Children != null)
{
foreach (var child in element.Children)
{
CleanAttributes(child, attributeFilter);
}
}
}
public TElement AssertElement <TElement> (int index, Action <TElement> assertAction = null)
where TElement : IDocumentElement
{
Contract.Requires(index >= 0);
Contract.Ensures(Contract.Result <TElement>() != null);
IDocumentElement element = doc.Children[index];
Assert.IsInstanceOf <TElement> (element);
if (assertAction != null)
{
assertAction((TElement)element);
}
return((TElement)element);
}
private bool WriteHeading(IDocumentElement element)
{
_textWriter.EnsureBlankLine();
if (element.Children != null)
{
foreach (var child in element.Children)
{
Write(child);
}
}
_textWriter.EnsureNewLine();
return(true);
}
private void RemoveEmptyContainers(IDocumentElement element)
{
for (var i = element.Children.Count - 1; i >= 0; i--)
{
var child = element.Children[i];
if (child != null &&
(child.ElementType == ElementTypes.Container || child.ElementType == ElementTypes.Paragraph) &&
(child.Children == null || child.Children.Count == 0))
{
var container = child as IContainerElement;
if (container != null && container.ContainerType == ContainerTypes.TableDataCell)
{
continue; // Empty cells in tables are valid, deleting them moves all the other columns to the left
}
element.Children.RemoveAt(i);
}
}
}
private bool WriteInlineText(IDocumentElement element)
{
var textElement = element as ITextElement;
if (textElement != null)
{
_textWriter.Write(textElement.Text);
}
if (element.Children != null)
{
foreach (var child in element.Children)
{
Write(child);
}
}
return(true);
}
private bool WriteParagraph(IDocumentElement element)
{
var textElement = element as ITextElement;
if (textElement != null && !string.IsNullOrEmpty(textElement.Text))
{
_textWriter.Write(textElement.Text);
}
if (element.Children != null)
{
foreach (var child in element.Children)
{
Write(child);
}
}
return(true);
}
public void AddTextToParagraph(string text, bool isFirstElementOfContinuedLine)
{
Contract.Requires(text != null);
CreateParagraphIfNoneIsAlreadyOpen();
int childrenCount = currentParagraph.ChildrenCount;
if (childrenCount > 0)
{
IDocumentElement lastChild = currentParagraph.Children[childrenCount - 1];
TextElement textChild = lastChild as TextElement;
if (textChild != null)
{
// ReSharper disable once PossibleInvalidOperationException
if (textChild.Style == currentParagraphTextStyle.Value)
{
textChild.AppendText(text);
}
else
{
AddTextElementToParagraph(
currentParagraph, text, currentParagraphTextStyle.Value, isFirstElementOfContinuedLine);
}
}
else if (lastChild is InternalLinkElement || lastChild is ExternalLinkElement)
{
// ReSharper disable once PossibleInvalidOperationException
AddTextElementToParagraph(
currentParagraph, text, currentParagraphTextStyle.Value, isFirstElementOfContinuedLine);
}
else
{
throw new InvalidOperationException("BUG: is this possible?");
}
}
else
{
// ReSharper disable once PossibleInvalidOperationException
AddToParagraph(CreateTextElement(text, currentParagraphTextStyle.Value));
}
}
public void CleanElements(IDocumentElement element, Func <IDocumentElement, bool> elementFilter)
{
if (element == null || elementFilter == null || element.Children == null)
{
return;
}
for (var i = element.Children.Count - 1; i >= 0; i--)
{
var child = element.Children[i];
if (elementFilter(child))
{
CleanElements(child, elementFilter);
}
else
{
element.Children.RemoveAt(i);
}
}
}
private void RemoveEmptyTextElements(IDocumentElement element)
{
for (var i = element.Children.Count - 1; i >= 0; i--)
{
var child = element.Children[i];
if (child != null &&
(child.ElementType == ElementTypes.RawText ||
child.ElementType == ElementTypes.InlineText) &&
(child.Children == null || child.Children.Count == 0))
{
var text = child as ITextElement;
if (text != null && !string.IsNullOrEmpty(text.Text))
{
continue;
}
element.Children.RemoveAt(i);
}
}
}
public ParsingFixture AssertText(
IDocumentElementContainer container, int index, string expectedText, TextElement.TextStyle?expectedStyle = null)
{
Contract.Requires(container != null);
Contract.Requires(expectedText != null);
Contract.Requires(index >= 0);
IDocumentElement element = container.Children[index];
Assert.IsInstanceOf <TextElement> (element);
TextElement tel = (TextElement)element;
Assert.AreEqual(expectedText, tel.Text);
if (expectedStyle.HasValue)
{
Assert.AreEqual(expectedStyle.Value, tel.Style);
}
return(this);
}
private bool WriteInlineText(IDocumentElement element)
{
var textElement = element as ITextElement;
var styleElement = element as IStyleElement;
Action close = null;
if (styleElement != null && styleElement.Styles != null)
{
if (styleElement.Styles.ContainsKey("font-weight") && styleElement.Styles["font-weight"] == "bold")
{
_textWriter.Write("**");
close = () => _textWriter.Write("**");
}
else if (styleElement.Styles.ContainsKey("font-style") && styleElement.Styles["font-style"] == "italic")
{
_textWriter.Write("_");
close = () => _textWriter.Write("_");
}
}
if (textElement != null)
{
_textWriter.Write(textElement.Text);
}
if (element.Children != null)
{
foreach (var child in element.Children)
{
Write(child);
}
}
if (close != null)
{
close();
}
return(true);
}
public void FormatDocument(string mimeType, System.IO.TextWriter writer, IDocumentElement rootElement, bool fragment)
{
if (string.Equals(mimeType, "text/html", StringComparison.OrdinalIgnoreCase))
{
FormatHtml(writer, rootElement, fragment);
}
else if (string.Equals(mimeType, "text/x-markdown", StringComparison.OrdinalIgnoreCase))
{
FormatMarkdown(writer, rootElement, fragment);
}
else if (string.Equals(mimeType, "text/plain", StringComparison.OrdinalIgnoreCase))
{
FormatPlainText(writer, rootElement, fragment);
}
else
{
throw new NotImplementedException();
}
}
private static void BeginParagraphElement(ParserContext context, IDocumentElement element,
string[] attributeParams)
{
if (element.Parent.ElementType == ElementTypes.Container)
{
var parentContainer = element.Parent as IContainerElement;
if (parentContainer != null &&
(parentContainer.ContainerType == ContainerTypes.BareList ||
parentContainer.ContainerType == ContainerTypes.BulletList ||
parentContainer.ContainerType == ContainerTypes.NumberedList))
{
context.Template.AddElementOpen("li", attributeParams);
}
else
{
context.Template.AddElementOpen("p", attributeParams);
}
}
else
{
context.Template.AddElementOpen("p", attributeParams);
}
}
public void AdjustHeadings(IDocumentElement element, int minimumHeadingLevel)
{
Action <IDocumentElement, List <INestedElement> > addHeadings = null;
addHeadings = (e, hl) =>
{
var h = e as INestedElement;
if (e.ElementType == ElementTypes.Heading && h != null)
{
hl.Add(h);
}
if (e.Children != null)
{
foreach (var child in e.Children)
{
addHeadings(child, hl);
}
}
};
var headings = new List <INestedElement>();
addHeadings(element, headings);
if (headings.Count > 0)
{
var lowestHeading = headings.Min(h => h.Level);
if (lowestHeading > 1)
{
foreach (var heading in headings)
{
heading.Level = heading.Level - lowestHeading + minimumHeadingLevel;
}
}
}
}
private bool WriteBreak(IDocumentElement element)
{
var breakElement = element as IBreakElement;
var breakType = BreakTypes.LineBreak;
if (breakElement != null)
{
breakType = breakElement.BreakType;
}
_textWriter.EnsureBlankLine();
switch (breakType)
{
case BreakTypes.HorizontalRule:
_characterStream.State = MarkdownStates.HorizontalRule;
_textWriter.Write("---");
_textWriter.EnsureBlankLine();
break;
}
return(true);
}
private bool WriteContainer(IDocumentElement element)
{
var containerElement = element as IContainerElement;
var configurableElement = element as IConfigurableElement;
if (containerElement == null)
{
return(false);
}
Action close = null;
switch (containerElement.ContainerType)
{
case ContainerTypes.BlockQuote:
_textWriter.EnsureBlankLine();
_characterStream.State = MarkdownStates.BlockQuote;
close = () => _textWriter.EnsureBlankLine();
break;
case ContainerTypes.BulletList:
_listLevel++;
if (_listLevel == 0)
{
_textWriter.EnsureBlankLine();
}
_characterStream.State = MarkdownStates.UnorderedList;
close = () =>
{
if (_listLevel == 0)
{
_textWriter.EnsureBlankLine();
}
_listLevel--;
};
break;
case ContainerTypes.NumberedList:
_listLevel++;
while (_listItemNumber.Count <= _listLevel)
{
_listItemNumber.Add(0);
}
_listItemNumber[_listLevel] = 1;
if (_listLevel == 0)
{
_textWriter.EnsureBlankLine();
}
_characterStream.State = MarkdownStates.NumberedList;
close = () =>
{
if (_listLevel == 0)
{
_textWriter.EnsureBlankLine();
}
_listLevel--;
};
break;
case ContainerTypes.PreFormatted:
_textWriter.EnsureBlankLine();
_characterStream.State = MarkdownStates.SourceCode;
_textWriter.Write("```");
_textWriter.WriteLineBreak();
close = () =>
{
_textWriter.EnsureNewLine();
_textWriter.Write("```");
_textWriter.EnsureBlankLine();
};
break;
case ContainerTypes.Table:
containerElement.ChildLayout = new TableLayout();
_textWriter.EnsureBlankLine();
_characterStream.State = MarkdownStates.TableHeadings;
close = () => _textWriter.EnsureBlankLine();
break;
case ContainerTypes.TableHeader:
close = () =>
{
var table = FindPriorElement <ContainerElement>(element, c => c.ContainerType == ContainerTypes.Table);
if (table == null)
{
return;
}
var tableLayout = table.ChildLayout as TableLayout;
if (tableLayout == null)
{
return;
}
var tableBody = table.Children
.Where(e => e.ElementType == ElementTypes.Container)
.Cast <IContainerElement>()
.FirstOrDefault(c => c.ContainerType == ContainerTypes.TableBody);
if (tableBody != null)
{
var tableBodyChildren = ((IDocumentElement)tableBody).Children;
if (tableBodyChildren != null)
{
foreach (var tableRow in tableBodyChildren
.Where(c => c.ElementType == ElementTypes.Container && c.Children != null)
.Cast <IContainerElement>()
.Where(c => c.ContainerType == ContainerTypes.TableDataRow)
.Cast <IDocumentElement>())
{
var columnIndex = 0;
foreach (var dataCell in tableRow.Children
.Where(c => c.ElementType == ElementTypes.Container && c.Children != null)
.Cast <IContainerElement>()
.Where(c => c.ContainerType == ContainerTypes.TableDataCell)
.Cast <IConfigurableElement>())
{
string alignment = null;
if (dataCell != null && dataCell.Attributes != null && dataCell.Attributes.ContainsKey("align"))
{
alignment = dataCell.Attributes["align"];
}
tableLayout.SetColumn(columnIndex++, alignment, null);
}
}
}
}
_textWriter.EnsureNewLine();
_textWriter.Write('|');
foreach (var tableColumn in tableLayout.Columns)
{
var padding = new string('-', tableColumn.Width);
switch (tableColumn.Alignment)
{
case "left":
_textWriter.Write(':');
_textWriter.Write(padding);
_textWriter.Write(' ');
break;
case "right":
_textWriter.Write(' ');
_textWriter.Write(padding);
_textWriter.Write(':');
break;
case "center":
_textWriter.Write(':');
_textWriter.Write(padding);
_textWriter.Write(':');
break;
default:
_textWriter.Write(' ');
_textWriter.Write(padding);
_textWriter.Write(' ');
break;
}
_textWriter.Write('|');
}
};
break;
case ContainerTypes.TableHeaderRow:
case ContainerTypes.TableDataRow:
case ContainerTypes.TableFooterRow:
_textWriter.EnsureNewLine();
_characterStream.State = MarkdownStates.TableRow;
_textWriter.Write("|");
_tableColumnIndex = 0;
break;
case ContainerTypes.TableDataCell:
{
var align = string.Empty;
if (configurableElement != null && configurableElement.Attributes != null)
{
if (configurableElement.Attributes.ContainsKey("align"))
{
align = configurableElement.Attributes["align"];
}
}
var table = FindPriorElement <ContainerElement>(element, c => c.ContainerType == ContainerTypes.Table);
var tableLayout = (TableLayout)table.ChildLayout;
tableLayout.SetColumn(_tableColumnIndex, align, null);
_tableColumnIndex++;
_characterStream.State = MarkdownStates.TableRow;
_textWriter.Write(" ");
close = () => _textWriter.Write(" |");
break;
}
}
if (element.Children != null)
{
foreach (var child in element.Children)
{
Write(child);
}
}
if (close != null)
{
close();
}
return(true);
}
