/// <summary>
/// Parsing helper method.
/// </summary>
/// <param name="listItem">The listItem to edit.</param>
/// <param name="markdown">The markdown text.</param>
/// <param name="start">The start position.</param>
/// <param name="end">The end position.</param>
/// <param name="newLine">True if the text is a new line. Prefixed whitespace is ignored then.</param>
private static void AppendTextToListItem(ListItemBlock listItem, string markdown, int start, int end, bool newLine = false)
{
ListItemBuilder?listItemBuilder = null;
if (listItem.Blocks.Count > 0)
{
listItemBuilder = listItem.Blocks[listItem.Blocks.Count - 1] as ListItemBuilder;
}
if (listItemBuilder == null)
{
// Add a new block.
listItemBuilder = new ListItemBuilder();
listItem.Blocks.Add(listItemBuilder);
}
var builder = listItemBuilder.Builder;
if (builder.Length >= 2 &&
ParseHelpers.IsMarkdownWhiteSpace(builder[builder.Length - 2]) &&
ParseHelpers.IsMarkdownWhiteSpace(builder[builder.Length - 1]))
{
builder.Length -= 2;
builder.AppendLine();
}
else if (builder.Length > 0)
{
builder.Append(' ');
}
if (newLine)
{
start = Common.FindNextNoneWhiteSpace(markdown, start, end, true);
}
builder.Append(markdown, start, end - start);
}
private (ListItemBlock item, int consumedLines, ListStyle style, int startNumber)? ParseItemBlock(LineBlock markdown, MarkdownDocument document)
{
if (markdown.LineCount == 0)
{
return(null);
}
var firstLine = markdown[0];
var preInformation = GetListStyle(firstLine);
if (preInformation is null)
{
return(null);
}
var(style, preLength, startNumber) = preInformation.Value;
var indention = preLength;
bool isFirstLine = true;
bool isLazy = true;
var listBlock = markdown.RemoveFromLine((line, lineIndex) =>
{
if (isFirstLine)
{
isFirstLine = false;
return(indention, line.Length - indention, false, false);
}
if (line.IsWhiteSpace())
{
isLazy = false;
return(0, 0, false, false);
}
var firstNonWhitespace = line.IndexOfNonWhiteSpace();
var listInfo = GetListStyle(line.Slice(firstNonWhitespace));
if (listInfo.HasValue)
{
// a sub list must be indented more then 2 char more then the current indention
if (firstNonWhitespace >= indention)
{
// another list item will also disable lazy
isLazy = false;
return(indention, line.Length - indention, false, false);
}
// every other list will stop the current block
return(0, 0, true, true);
}
if (firstNonWhitespace < indention)
{
if (isLazy)
{
return(0, line.Length, false, false);
}
return(0, 0, true, true);
}
// if we are indented we will no longer support lazy
isLazy = false;
return(indention, line.Length - indention, false, false);
});
// remove empty lines at the end
listBlock = listBlock.TrimEnd();
var item = new ListItemBlock()
{
Blocks = document.ParseBlocks(listBlock),
};
return(item, listBlock.LineCount, style, startNumber);
}
