Beginning of first attempt to parse.

Will be completely wiped, I think, in favor of a Scanner (to tokens), then Parser mechanism.

parser.h

@@ -0,0 +1,55 @@
+#pragma once
+
+#include <ios>
+#include <string>
+#include <stack>
+
+namespace YAML
+{
+	class Node;
+
+	const std::string DocStart = "---";
+	const std::string DocEnd = "...";
+
+	const char SeqToken = '-';
+
+	enum CONTEXT { C_BLOCK, C_FLOW };
+
+	class Parser
+	{
+	public:
+		struct State
+		{
+			State(CONTEXT context_, int indent_, bool startingNewLine_)
+			: context(context_), indent(indent_), startingNewLine(startingNewLine_) {}
+
+			CONTEXT context;
+			int indent;
+			bool startingNewLine;
+		};
+
+	public:
+		Parser(std::istream& in);
+		~Parser();
+
+		operator bool () const;
+		bool operator !() const;
+
+		// parse helpers
+		static bool IsWhitespace(char ch);
+		void Putback(const std::string& str);
+		void StripWhitespace(int n = -1);
+		int GetNumOfSpaces();
+		bool SeqContinues();
+
+		// readers
+		Node *ReadNextNode();
+		std::string ReadNextToken();
+
+	private:
+		bool m_ok;
+
+		std::istream& INPUT;
+		std::stack <State> m_state;
+	};
+}