/// <summary>
/// Parsing helper.
/// </summary>
/// <param name="list"></param>
/// <returns> <c>true</c> if any of the list items were parsed using the block parser. </returns>
private static bool ReplaceStringBuilders(ListBlock list)
{
bool usedBlockParser = false;
foreach (var listItem in list.Items)
{
// Use the inline parser if there is one paragraph, use the block parser otherwise.
var useBlockParser = listItem.Blocks.Count(block => block.Type == MarkdownBlockType.ListItemBuilder) > 1;
// Recursively replace any child lists.
foreach (var block in listItem.Blocks)
{
if (block is ListBlock && ReplaceStringBuilders((ListBlock)block))
{
useBlockParser = true;
}
}
// Parse the text content of the list items.
var newBlockList = new List <MarkdownBlock>();
foreach (var block in listItem.Blocks)
{
if (block is ListItemBuilder)
{
var blockText = ((ListItemBuilder)block).Builder.ToString();
if (blockText.TrimStart().StartsWith("```"))
{
useBlockParser = true;
}
if (useBlockParser)
{
// Parse the list item as a series of blocks.
int actualEnd;
newBlockList.AddRange(MarkdownDocument.Parse(blockText, 0, blockText.Length, quoteDepth: 0, actualEnd: out actualEnd));
usedBlockParser = true;
}
else
{
// Don't allow blocks.
var paragraph = new ParagraphBlock();
paragraph.Inlines = Common.ParseInlineChildren(blockText, 0, blockText.Length);
newBlockList.Add(paragraph);
}
}
else
{
newBlockList.Add(block);
}
}
listItem.Blocks = newBlockList;
}
return(usedBlockParser);
}
/// <summary>
/// Parsing helper.
/// </summary>
/// <param name="list"></param>
/// <returns> <c>true</c> if any of the list items were parsed using the block parser. </returns>
private static bool ReplaceStringBuilders(ListBlock list)
{
bool usedBlockParser = false;
foreach (var listItem in list.Items)
{
// Use the inline parser if there is one paragraph, use the block parser otherwise.
var useBlockParser = listItem.Blocks.Count(block => block.Type == MarkdownBlockType.ListItemBuilder) > 1;
// Recursively replace any child lists.
foreach (var block in listItem.Blocks)
if (block is ListBlock && ReplaceStringBuilders((ListBlock)block))
useBlockParser = true;
// Parse the text content of the list items.
var newBlockList = new List<MarkdownBlock>();
foreach (var block in listItem.Blocks)
{
if (block is ListItemBuilder)
{
var blockText = ((ListItemBuilder)block).Builder.ToString();
if (useBlockParser)
{
// Parse the list item as a series of blocks.
int actualEnd;
newBlockList.AddRange(MarkdownDocument.Parse(blockText, 0, blockText.Length, quoteDepth: 0, actualEnd: out actualEnd));
usedBlockParser = true;
}
else
{
// Don't allow blocks.
var paragraph = new ParagraphBlock();
paragraph.Inlines = Common.ParseInlineChildren(blockText, 0, blockText.Length);
newBlockList.Add(paragraph);
}
}
else
newBlockList.Add(block);
}
listItem.Blocks = newBlockList;
}
return usedBlockParser;
}
/// <summary>
/// Parses a list block.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="start"> The location of the first character in the block. </param>
/// <param name="maxEnd"> The location to stop parsing. </param>
/// <param name="quoteDepth"> The current nesting level for block quoting. </param>
/// <param name="actualEnd"> Set to the end of the block when the return value is non-null. </param>
/// <returns> A parsed list block, or <c>null</c> if this is not a list block. </returns>
internal static ListBlock Parse(string markdown, int start, int maxEnd, int quoteDepth, out int actualEnd)
{
var russianDolls = new List<NestedListInfo>();
int russianDollIndex = -1;
bool previousLineWasBlank = false;
ListItemBlock currentListItem = null;
actualEnd = start;
foreach (var lineInfo in Common.ParseLines(markdown, start, maxEnd, quoteDepth))
{
// Is this line blank?
if (lineInfo.IsLineBlank)
{
// The line is blank, which means the next line which contains text may end the list (or it may not...).
previousLineWasBlank = true;
}
else
{
// Does the line contain a list item?
ListItemPreamble listItemPreamble = null;
if (lineInfo.FirstNonWhitespaceChar - lineInfo.StartOfLine < (russianDollIndex + 2) * 4)
listItemPreamble = ParseItemPreamble(markdown, lineInfo.FirstNonWhitespaceChar, lineInfo.EndOfLine);
if (listItemPreamble != null)
{
// Yes, this line contains a list item.
// Determining the nesting level is done as follows:
// 1. If this is the first line, then the list is not nested.
// 2. If the number of spaces at the start of the line is equal to that of
// an existing list, then the nesting level is the same as that list.
// 3. Otherwise, if the number of spaces is 0-4, then the nesting level
// is one level deep.
// 4. Otherwise, if the number of spaces is 5-8, then the nesting level
// is two levels deep (but no deeper than one level more than the
// previous list item).
// 5. Etcetera.
ListBlock listToAddTo = null;
int spaceCount = lineInfo.FirstNonWhitespaceChar - lineInfo.StartOfLine;
russianDollIndex = russianDolls.FindIndex(rd => rd.SpaceCount == spaceCount);
if (russianDollIndex >= 0)
{
// Add the new list item to an existing list.
listToAddTo = russianDolls[russianDollIndex].List;
// Don't add new list items to items higher up in the list.
russianDolls.RemoveRange(russianDollIndex + 1, russianDolls.Count - (russianDollIndex + 1));
}
else
{
russianDollIndex = Math.Max(1, 1 + (spaceCount - 1) / 4);
if (russianDollIndex < russianDolls.Count)
{
// Add the new list item to an existing list.
listToAddTo = russianDolls[russianDollIndex].List;
// Don't add new list items to items higher up in the list.
russianDolls.RemoveRange(russianDollIndex + 1, russianDolls.Count - (russianDollIndex + 1));
}
else
{
// Create a new list.
listToAddTo = new ListBlock { Style = listItemPreamble.Style, Items = new List<ListItemBlock>() };
if (russianDolls.Count > 0)
currentListItem.Blocks.Add(listToAddTo);
russianDollIndex = russianDolls.Count;
russianDolls.Add(new NestedListInfo { List = listToAddTo, SpaceCount = spaceCount });
}
}
// Add a new list item.
currentListItem = new ListItemBlock() { Blocks = new List<MarkdownBlock>() };
listToAddTo.Items.Add(currentListItem);
// Add the rest of the line to the builder.
AppendTextToListItem(currentListItem, markdown, listItemPreamble.ContentStartPos, lineInfo.EndOfLine);
}
else
{
// No, this line contains text.
// Is there even a list in progress?
if (currentListItem == null)
{
actualEnd = start;
return null;
}
// 0 spaces = end of the list.
// 1-4 spaces = first level.
// 5-8 spaces = second level, etc.
if (previousLineWasBlank)
{
// This is the start of a new paragraph.
int spaceCount = lineInfo.FirstNonWhitespaceChar - lineInfo.StartOfLine;
if (spaceCount == 0)
break;
russianDollIndex = Math.Min(russianDollIndex, (spaceCount - 1) / 4);
ListBlock listToAddTo = russianDolls[russianDollIndex].List;
currentListItem = listToAddTo.Items[listToAddTo.Items.Count - 1];
currentListItem.Blocks.Add(new ListItemBuilder());
AppendTextToListItem(currentListItem, markdown, Math.Min(lineInfo.FirstNonWhitespaceChar, lineInfo.StartOfLine + (russianDollIndex + 1) * 4), lineInfo.EndOfLine);
}
else
{
// Inline text.
AppendTextToListItem(currentListItem, markdown, lineInfo.FirstNonWhitespaceChar, lineInfo.EndOfLine);
}
}
// The line was not blank.
previousLineWasBlank = false;
}
// Go to the next line.
actualEnd = lineInfo.EndOfLine;
}
var result = russianDolls[0].List;
ReplaceStringBuilders(result);
return result;
}
/// <summary>
/// Parses a list block.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="start"> The location of the first character in the block. </param>
/// <param name="maxEnd"> The location to stop parsing. </param>
/// <param name="quoteDepth"> The current nesting level for block quoting. </param>
/// <param name="actualEnd"> Set to the end of the block when the return value is non-null. </param>
/// <returns> A parsed list block, or <c>null</c> if this is not a list block. </returns>
internal static ListBlock Parse(string markdown, int start, int maxEnd, int quoteDepth, out int actualEnd)
{
actualEnd = start;
ListItemBlock currentListItem = null;
ListBlock listToAddTo = null;
var listStack = new Stack <ListBlock>();
var level = 0;
var lastLevel = -1;
var previousLineWasBlank = false;
var previousLineWasListHeader = false;
var isCodeBlock = false;
var lastStype = ListStyle.Bulleted;
foreach (var lineInfo in Common.ParseLines(markdown, start, maxEnd, quoteDepth))
{
// Is this line blank?
if (lineInfo.IsLineBlank)
{
// The line is blank, which means the next line
// which contains text may end the list (or it may not...).
previousLineWasBlank = true;
}
else
{
// Does the line contain a list item?
ListItemPreamble listItemPreamble = null;
if (lineInfo.FirstNonWhitespaceChar - lineInfo.StartOfLine < (level + 2) * 4)
{
listItemPreamble = ParseItemPreamble(markdown, lineInfo.FirstNonWhitespaceChar, lineInfo.EndOfLine);
}
if (listItemPreamble != null)
{
previousLineWasListHeader = true;
// Yes, this line contains a list item.
// Determining the nesting level is done as follows:
// 1. If this is the first line, then the list is not nested.
// 2. If the number of spaces at the start of the line is equal to that of
// an existing list, then the nesting level is the same as that list.
// 3. Otherwise, if the number of spaces is 0-4, then the nesting level
// is one level deep.
// 4. Otherwise, if the number of spaces is 5-8, then the nesting level
// is two levels deep (but no deeper than one level more than the
// previous list item).
// 5. Etcetera.
var info = markdown.Substring(lineInfo.StartOfLine, lineInfo.EndOfLine - lineInfo.StartOfLine);
//Console.WriteLine(info);
// Stack
if (markdown.Substring(lineInfo.StartOfLine).TrimStart().StartsWith("- [gdb with lua"))
{
int jj = 0;
}
int spaceCount = lineInfo.FirstNonWhitespaceChar - lineInfo.StartOfLine;
level = GetLevel(markdown.Substring(lineInfo.StartOfLine, spaceCount));
if (level > lastLevel)
{
// Create a new list.
var newlistToAddTo = new ListBlock {
Style = listItemPreamble.Style,
Items = new List <ListItemBlock>()
};
lastStype = newlistToAddTo.Style;
listStack.Push(newlistToAddTo);
if (currentListItem != null)
{
currentListItem.Blocks.Add(newlistToAddTo);
}
listToAddTo = newlistToAddTo;
}
else if (level < lastLevel)
{
int popCount = lastLevel - level;
while (popCount > 0)
{
popCount--;
listStack.Pop();
}
listToAddTo = listStack.Peek();
}
// Add a new list item.
currentListItem = new ListItemBlock {
Blocks = new List <MarkdownBlock>()
};
listToAddTo.Items.Add(currentListItem);
// Add the rest of the line to the builder.
AppendTextToListItem(currentListItem, markdown, listItemPreamble.ContentStartPos, lineInfo.EndOfLine);
lastLevel = level;
}
else
{
// No, this line contains text.
// Is there even a list in progress?
if (currentListItem == null)
{
actualEnd = start;
return(null);
}
// -------------------------------- //
// 0 spaces = end of the list. //
// 1-4 spaces = first level. //
// 5-8 spaces = second level, etc. //
// -------------------------------- //
bool codeTag = false;
if ((previousLineWasBlank) && (!isCodeBlock))
{
// This is the start of a new paragraph.
int spaceCount = lineInfo.FirstNonWhitespaceChar - lineInfo.StartOfLine;
if (spaceCount == 0)
{
break;
}
level = GetLevel(markdown.Substring(lineInfo.StartOfLine, spaceCount));
int popCount = lastLevel - level;
while (popCount > 0)
{
popCount--;
listStack.Pop();
}
listToAddTo = listStack.Peek();
currentListItem = listToAddTo.Items[listToAddTo.Items.Count - 1];
currentListItem.Blocks.Add(new ListItemBuilder());
codeTag = AppendTextToListItem(currentListItem, markdown, Math.Min(lineInfo.FirstNonWhitespaceChar, lineInfo.StartOfLine + (level + 1) * 4), lineInfo.EndOfLine);
if (codeTag)
{
isCodeBlock = !isCodeBlock;
}
}
else
{
// Inline text.
if (previousLineWasListHeader)
{
//currentListItem = new ListItemBlock {
// Blocks = new List<MarkdownBlock>()
//};
//listToAddTo.Items.Add(currentListItem);
var newlistToAddTo = new ListBlock {
Style = lastStype,
Items = new List <ListItemBlock>()
};
listStack.Push(newlistToAddTo);
if (currentListItem != null)
{
currentListItem.Blocks.Add(newlistToAddTo);
}
listToAddTo = newlistToAddTo;
// Add a new list item.
currentListItem = new ListItemBlock {
Blocks = new List <MarkdownBlock>()
};
listToAddTo.Items.Add(currentListItem);
lastLevel = lastLevel + 1;
}
codeTag = AppendTextToListItem(currentListItem, markdown, lineInfo.FirstNonWhitespaceChar, lineInfo.EndOfLine);
}
previousLineWasListHeader = false;
if (codeTag)
{
isCodeBlock = !isCodeBlock;
}
}
// The line was not blank.
previousLineWasBlank = false;
}
// Go to the next line.
actualEnd = lineInfo.EndOfLine;
}
var result = listStack.Last();
ReplaceStringBuilders(result);
return(result);
}
/// <summary>
/// Parses a list block.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="start"> The location of the first character in the block. </param>
/// <param name="maxEnd"> The location to stop parsing. </param>
/// <param name="quoteDepth"> The current nesting level for block quoting. </param>
/// <param name="actualEnd"> Set to the end of the block when the return value is non-null. </param>
/// <returns> A parsed list block, or <c>null</c> if this is not a list block. </returns>
internal static ListBlock Parse(string markdown, int start, int maxEnd, int quoteDepth, out int actualEnd)
{
var russianDolls = new List <NestedListInfo>();
int russianDollIndex = -1;
bool previousLineWasBlank = false;
ListItemBlock currentListItem = null;
actualEnd = start;
foreach (var lineInfo in Common.ParseLines(markdown, start, maxEnd, quoteDepth))
{
// Is this line blank?
if (lineInfo.IsLineBlank)
{
// The line is blank, which means the next line which contains text may end the list (or it may not...).
previousLineWasBlank = true;
}
else
{
// Does the line contain a list item?
ListItemPreamble listItemPreamble = null;
if (lineInfo.FirstNonWhitespaceChar - lineInfo.StartOfLine < (russianDollIndex + 2) * 4)
{
listItemPreamble = ParseItemPreamble(markdown, lineInfo.FirstNonWhitespaceChar, lineInfo.EndOfLine);
}
if (listItemPreamble != null)
{
// Yes, this line contains a list item.
// Determining the nesting level is done as follows:
// 1. If this is the first line, then the list is not nested.
// 2. If the number of spaces at the start of the line is equal to that of
// an existing list, then the nesting level is the same as that list.
// 3. Otherwise, if the number of spaces is 0-4, then the nesting level
// is one level deep.
// 4. Otherwise, if the number of spaces is 5-8, then the nesting level
// is two levels deep (but no deeper than one level more than the
// previous list item).
// 5. Etcetera.
ListBlock listToAddTo = null;
int spaceCount = lineInfo.FirstNonWhitespaceChar - lineInfo.StartOfLine;
russianDollIndex = russianDolls.FindIndex(rd => rd.SpaceCount == spaceCount);
if (russianDollIndex >= 0)
{
// Add the new list item to an existing list.
listToAddTo = russianDolls[russianDollIndex].List;
}
else
{
russianDollIndex = Math.Max(1, 1 + (spaceCount - 1) / 4);
if (russianDollIndex < russianDolls.Count)
{
// Add the new list item to an existing list.
listToAddTo = russianDolls[russianDollIndex].List;
}
else
{
// Create a new list.
listToAddTo = new ListBlock {
Style = listItemPreamble.Style, Items = new List <ListItemBlock>()
};
if (russianDolls.Count > 0)
{
currentListItem.Blocks.Add(listToAddTo);
}
russianDollIndex = russianDolls.Count;
russianDolls.Add(new NestedListInfo {
List = listToAddTo, SpaceCount = spaceCount
});
}
}
// Add a new list item.
currentListItem = new ListItemBlock()
{
Blocks = new List <MarkdownBlock>()
};
listToAddTo.Items.Add(currentListItem);
// Add the rest of the line to the builder.
AppendTextToListItem(currentListItem, markdown, listItemPreamble.ContentStartPos, lineInfo.EndOfLine);
}
else
{
// No, this line contains text.
// Is there even a list in progress?
if (currentListItem == null)
{
actualEnd = start;
return(null);
}
// 0 spaces = end of the list.
// 1-4 spaces = first level.
// 5-8 spaces = second level, etc.
if (previousLineWasBlank)
{
// This is the start of a new paragraph.
int spaceCount = lineInfo.FirstNonWhitespaceChar - lineInfo.StartOfLine;
if (spaceCount == 0)
{
break;
}
russianDollIndex = Math.Min(russianDollIndex, (spaceCount - 1) / 4);
ListBlock listToAddTo = russianDolls[russianDollIndex].List;
currentListItem = listToAddTo.Items[listToAddTo.Items.Count - 1];
currentListItem.Blocks.Add(new ListItemBuilder());
AppendTextToListItem(currentListItem, markdown, Math.Min(lineInfo.FirstNonWhitespaceChar, lineInfo.StartOfLine + (russianDollIndex + 1) * 4), lineInfo.EndOfLine);
}
else
{
// Inline text.
AppendTextToListItem(currentListItem, markdown, lineInfo.FirstNonWhitespaceChar, lineInfo.EndOfLine);
}
}
// The line was not blank.
previousLineWasBlank = false;
}
// Go to the next line.
actualEnd = lineInfo.EndOfLine;
}
var result = russianDolls[0].List;
ReplaceStringBuilders(result);
return(result);
}
/// <summary>
/// Renders a list element.
/// </summary>
/// <param name="element"></param>
/// <param name="blockUIElementCollection"></param>
/// <param name="context"></param>
private void RenderListElement(ListBlock element, UIElementCollection blockUIElementCollection, RenderContext context)
{
// Create a grid with two columns.
Grid grid = new Grid();
grid.Margin = ListMargin;
// The first column for the bullet (or number) and the second for the text.
grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(ListGutterWidth) });
grid.ColumnDefinitions.Add(new ColumnDefinition() { Width = new GridLength(1, GridUnitType.Star) });
for (int rowIndex = 0; rowIndex < element.Items.Count; rowIndex ++)
{
var listItem = element.Items[rowIndex];
// Add a row definition.
grid.RowDefinitions.Add(new RowDefinition { Height = GridLength.Auto });
// Add the bullet or number.
var bullet = CreateTextBlock(context);
bullet.Margin = ParagraphMargin;
switch (element.Style)
{
case ListStyle.Bulleted:
bullet.Text = "•";
break;
case ListStyle.Numbered:
bullet.Text = $"{rowIndex + 1}.";
break;
}
bullet.HorizontalAlignment = HorizontalAlignment.Right;
bullet.Margin = new Thickness(0, 0, ListBulletSpacing, 0);
Grid.SetRow(bullet, rowIndex);
grid.Children.Add(bullet);
// Add the list item content.
var content = new StackPanel();
RenderBlocks(listItem.Blocks, content.Children, context);
Grid.SetColumn(content, 1);
Grid.SetRow(content, rowIndex);
grid.Children.Add(content);
}
blockUIElementCollection.Add(grid);
}
