private IEnumerable ReadProjectItems()

in src/StructuredLogger/BinaryLogger/BuildEventArgsReader.cs [1072:1152]
69 lines of code
15 McCabe index (conditional complexity)

        private IEnumerable ReadProjectItems()
        {
            IList<DictionaryEntry> list;

            // starting with format version 10 project items are grouped by name
            // so we only have to write the name once, and then the count of items
            // with that name. When reading a legacy binlog we need to read the
            // old style flat list where the name is duplicated for each item.
            if (fileFormatVersion < 10)
            {
                int count = ReadInt32();
                if (count == 0)
                {
                    return null;
                }

                list = new DictionaryEntry[count];
                for (int i = 0; i < count; i++)
                {
                    string itemName = ReadString();
                    ITaskItem item = ReadTaskItem();
                    list[i] = new DictionaryEntry(itemName, item);
                }
            }
            else if (fileFormatVersion < 12)
            {
                int count = ReadInt32();
                if (count == 0)
                {
                    return null;
                }

                list = new List<DictionaryEntry>();
                for (int i = 0; i < count; i++)
                {
                    string itemType = ReadDeduplicatedString();
                    var items = ReadTaskItemList();
                    if (items != null)
                    {
                        foreach (var item in items)
                        {
                            list.Add(new DictionaryEntry(itemType, item));
                        }
                    }
                }

                if (list.Count == 0)
                {
                    list = null;
                }
            }
            else
            {
                list = new List<DictionaryEntry>();

                while (true)
                {
                    string itemType = ReadDeduplicatedString();
                    if (string.IsNullOrEmpty(itemType))
                    {
                        break;
                    }

                    var items = ReadTaskItemList();
                    if (items != null)
                    {
                        foreach (var item in items)
                        {
                            list.Add(new DictionaryEntry(itemType, item));
                        }
                    }
                }

                if (list.Count == 0)
                {
                    list = null;
                }
            }

            return list;
        }