Added api sketch

src/collectionstack.h

@@ -0,0 +1,35 @@
+#ifndef COLLECTIONSTACK_H_62B23520_7C8E_11DE_8A39_0800200C9A66
+#define COLLECTIONSTACK_H_62B23520_7C8E_11DE_8A39_0800200C9A66
+
+#if !defined(__GNUC__) || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4) || (__GNUC__ >= 4) // GCC supports "pragma once" correctly since 3.4
+#pragma once
+#endif
+
+
+#include <stack>
+#include <cassert>
+
+namespace YAML
+{
+	struct CollectionType {
+		enum value { None, BlockMap, BlockSeq, FlowMap, FlowSeq, CompactMap };
+	};
+
+	class CollectionStack
+	{
+	public:
+		CollectionType::value GetCurCollectionType() const {
+			if(collectionStack.empty())
+				return CollectionType::None;
+			return collectionStack.top();
+		}
+		
+		void PushCollectionType(CollectionType::value type) { collectionStack.push(type); }
+		void PopCollectionType(CollectionType::value type) { assert(type == GetCurCollectionType()); collectionStack.pop(); }
+		
+	private:
+		std::stack<CollectionType::value> collectionStack;
+	};
+}
+
+#endif // COLLECTIONSTACK_H_62B23520_7C8E_11DE_8A39_0800200C9A66