Tanka.Markdown.MarkdownParser.ParseBlocks C# (CSharp) Method

        protected IEnumerable<Block> ParseBlocks(StringRange document)
        {
            int paragraphStart = -1;
            int paragraphEnd = -1;
            bool paragraphStarted = false;

            // there should be one monster builder always in builders
            ParagraphBuilder monsterBuilder = _builders.OfType<ParagraphBuilder>().Single();

            for (int start = 0; start < document.Length; start++)
            {
                IBlockBuilder builder = GetBuilder(start, document);

                // paragraph is special as it just eats
                // everything else the others don't
                // want. Special muncher!
                if (builder is ParagraphBuilder)
                {
                    if (!paragraphStarted)
                    {
                        paragraphStart = start;
                        paragraphStarted = true;
                    }

                    paragraphEnd = start;
                    continue;
                }

                if (builder is EmptyLineBuilder && paragraphStarted)
                {
                    // include the emtpty line character into the end
                    paragraphEnd = start;
                }

                // have to kill the monster so others can
                // feed too
                if (paragraphStarted)
                {
                    // yield it and then kill it!
                    yield return monsterBuilder.Build(paragraphStart, paragraphEnd, document);
                    paragraphStarted = false;
                }

                yield return BuildBlock(builder, start, document, out start);
            }

            // so one monster got away
            // run after it as it's yielding
            if (paragraphStarted)
            {
                yield return monsterBuilder.Build(paragraphStart, paragraphEnd, document);
            }
        }