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diff --git a/libsolidity/interface/InterfaceHandler.h b/libsolidity/interface/InterfaceHandler.h
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+/*
+	This file is part of cpp-ethereum.
+
+	cpp-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	cpp-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @author Lefteris <lefteris@ethdev.com>
+ * @date 2014
+ * Takes the parsed AST and produces the Natspec
+ * documentation and the ABI interface
+ * https://github.com/ethereum/wiki/wiki/Ethereum-Natural-Specification-Format
+ *
+ * Can generally deal with JSON files
+ */
+
+#pragma once
+
+#include <string>
+#include <memory>
+#include <json/json.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+// Forward declarations
+class ContractDefinition;
+enum class DocumentationType: uint8_t;
+
+enum class DocTagType: uint8_t
+{
+	None = 0,
+	Dev,
+	Notice,
+	Param,
+	Return,
+	Author,
+	Title
+};
+
+enum class CommentOwner
+{
+	Contract,
+	Function
+};
+
+class InterfaceHandler
+{
+public:
+	InterfaceHandler();
+
+	/// Get the given type of documentation
+	/// @param _contractDef The contract definition
+	/// @param _type        The type of the documentation. Can be one of the
+	///                     types provided by @c DocumentationType
+	/// @return             A string with the json representation of provided type
+	std::string documentation(
+		ContractDefinition const& _contractDef,
+		DocumentationType _type
+	);
+	/// Get the ABI Interface of the contract
+	/// @param _contractDef The contract definition
+	/// @return             A string with the json representation of the contract's ABI Interface
+	std::string abiInterface(ContractDefinition const& _contractDef);
+	std::string ABISolidityInterface(ContractDefinition const& _contractDef);
+	/// Get the User documentation of the contract
+	/// @param _contractDef The contract definition
+	/// @return             A string with the json representation of the contract's user documentation
+	std::string userDocumentation(ContractDefinition const& _contractDef);
+	/// Genereates the Developer's documentation of the contract
+	/// @param _contractDef The contract definition
+	/// @return             A string with the json representation
+	///                     of the contract's developer documentation
+	std::string devDocumentation(ContractDefinition const& _contractDef);
+
+private:
+	void resetUser();
+	void resetDev();
+
+	std::string::const_iterator parseDocTagLine(
+		std::string::const_iterator _pos,
+		std::string::const_iterator _end,
+		std::string& _tagString,
+		DocTagType _tagType,
+		bool _appending
+	);
+	std::string::const_iterator parseDocTagParam(
+		std::string::const_iterator _pos,
+		std::string::const_iterator _end
+	);
+	std::string::const_iterator appendDocTagParam(
+		std::string::const_iterator _pos,
+		std::string::const_iterator _end
+	);
+	void parseDocString(std::string const& _string, CommentOwner _owner);
+	std::string::const_iterator appendDocTag(
+		std::string::const_iterator _pos,
+		std::string::const_iterator _end,
+		CommentOwner _owner
+	);
+	std::string::const_iterator parseDocTag(
+		std::string::const_iterator _pos,
+		std::string::const_iterator _end,
+		std::string const& _tag,
+		CommentOwner _owner
+	);
+
+	// internal state
+	DocTagType m_lastTag;
+	std::string m_notice;
+	std::string m_dev;
+	std::string m_return;
+	std::string m_contractAuthor;
+	std::string m_author;
+	std::string m_title;
+	std::vector<std::pair<std::string, std::string>> m_params;
+};
+
+} //solidity NS
+} // dev NS