private void ParseLineGroup(
            ParseInput input
            )
        {
            ParseResult result;

            if (MarkdownHeading.CanParseFrom(input))
            {
                result = MarkdownHeading.ParseFrom(input);
            }
            else if (MarkdownHorizontalRule.CanParseFrom(input))
            {
                result = MarkdownHorizontalRule.ParseFrom(input);
            }
            else if (MarkdownQuote.CanParseFrom(input))
            {
                result = MarkdownQuote.ParseFrom(input);
            }
            else if (MarkdownList.CanParseFrom(input))
            {
                result = MarkdownList.ParseFrom(input);
            }
            else
            {
                result = MarkdownParagraph.ParseFrom(input);
            }
            foreach (IHtmlable entry in result.GetContent())
            {
                Content.AddLast(entry);
            }
        }
        public static ParseResult ParseFrom(
            ParseInput input
            )
        {
            ArraySegment <string> lines  = input.Lines();
            ParseResult           result = new ParseResult();

            if (!CanParseFrom(input))
            {
                return(result);
            }
            int endQuoteSection = FindEndOfQuoteSection(
                lines
                );

            string[] truncatedLines = new string[endQuoteSection];
            // Remove quote arrows and spaces, if needed
            for (int i = 0; i < endQuoteSection; i++)
            {
                string truncated = lines[i];
                if (lines[i].StartsWith(">"))
                {
                    truncated = truncated.Substring(1);
                    int spaces = 0;
                    // Count spaces
                    while (
                        (spaces < truncated.Length) &&
                        (truncated[spaces] == ' ')
                        )
                    {
                        spaces++;
                    }
                    // If there are fewer than 5 spaces, remove all
                    if (spaces < 5)
                    {
                        truncatedLines[i] = truncated.Substring(spaces);
                    }
                    else
                    {
                        // More than five, just remove one space
                        truncatedLines[i] = truncated.Substring(1);
                    }
                }
                else
                {
                    truncatedLines[i] = lines[i];
                }
                // Remove original line
                lines[i] = "";
            }

            /*
             * The truncated lines should be parsed as any other line group
             * and wrapped in a blockquote element
             */
            MarkdownParser parser = new MarkdownParser(
                truncatedLines
                );

            MarkdownQuote quoteElement = new MarkdownQuote(
                parser.ContentAsArray()
                );

            result.Success = true;
            result.AddContent(
                quoteElement
                );
            return(result);
        }