UniversalMarkdown.Parse.Elements.HorizontalRuleBlock.Parse C# (CSharp) Méthode

        internal static HorizontalRuleBlock Parse(string markdown, int start, int end)
        {
            // A horizontal rule is a line with at least 3 stars, optionally separated by spaces
            // OR a line with at least 3 dashes, optionally separated by spaces
            // OR a line with at least 3 underscores, optionally separated by spaces.
            char hrChar = '\0';
            int hrCharCount = 0;
            int pos = start;
            while (pos < end)
            {
                char c = markdown[pos++];
                if (c == '*' || c == '-' || c == '_')
                {
                    // All of the non-whitespace characters on the line must match.
                    if (hrCharCount > 0 && c != hrChar)
                        return null;
                    hrChar = c;
                    hrCharCount++;
                }
                else if (c == '\n')
                    break;
                else if (!Common.IsWhiteSpace(c))
                    return null;
            }

            // Hopefully there were at least 3 stars/dashes/underscores.
            return hrCharCount >= 3 ? new HorizontalRuleBlock() : null;
        }