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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/>.
+
+	This file is derived from the file "scanner.h", which was part of the
+	V8 project. The original copyright header follows:
+
+	Copyright 2006-2012, the V8 project authors. All rights reserved.
+	Redistribution and use in source and binary forms, with or without
+	modification, are permitted provided that the following conditions are
+	met:
+
+	* Redistributions of source code must retain the above copyright
+	  notice, this list of conditions and the following disclaimer.
+	* Redistributions in binary form must reproduce the above
+	  copyright notice, this list of conditions and the following
+	  disclaimer in the documentation and/or other materials provided
+	  with the distribution.
+	* Neither the name of Google Inc. nor the names of its
+	  contributors may be used to endorse or promote products derived
+	  from this software without specific prior written permission.
+
+	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+	"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+	LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+	A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+	OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+	THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+	(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+	OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/**
+ * @author Christian <c@ethdev.com>
+ * @date 2014
+ * Solidity scanner.
+ */
+
+#pragma once
+
+#include <libdevcore/Common.h>
+#include <libdevcore/Log.h>
+#include <libdevcore/CommonData.h>
+#include <libevmasm/SourceLocation.h>
+#include <libsolidity/parsing/Token.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+
+class AstRawString;
+class AstValueFactory;
+class ParserRecorder;
+
+class CharStream
+{
+public:
+	CharStream(): m_position(0) {}
+	explicit CharStream(std::string const& _source): m_source(_source), m_position(0) {}
+	int position() const { return m_position; }
+	bool isPastEndOfInput(size_t _charsForward = 0) const { return (m_position + _charsForward) >= m_source.size(); }
+	char get(size_t _charsForward = 0) const { return m_source[m_position + _charsForward]; }
+	char advanceAndGet(size_t _chars=1);
+	char rollback(size_t _amount);
+
+	void reset() { m_position = 0; }
+
+	///@{
+	///@name Error printing helper functions
+	/// Functions that help pretty-printing parse errors
+	/// Do only use in error cases, they are quite expensive.
+	std::string lineAtPosition(int _position) const;
+	std::tuple<int, int> translatePositionToLineColumn(int _position) const;
+	///@}
+
+private:
+	std::string m_source;
+	size_t m_position;
+};
+
+
+
+class Scanner
+{
+	friend class LiteralScope;
+public:
+
+	explicit Scanner(CharStream const& _source = CharStream(), std::string const& _sourceName = "") { reset(_source, _sourceName); }
+
+	/// Resets the scanner as if newly constructed with _source and _sourceName as input.
+	void reset(CharStream const& _source, std::string const& _sourceName);
+	/// Resets scanner to the start of input.
+	void reset();
+
+	/// Returns the next token and advances input
+	Token::Value next();
+
+	///@{
+	///@name Information about the current token
+
+	/// Returns the current token
+	Token::Value currentToken()
+	{
+		return m_currentToken.token;
+	}
+
+	SourceLocation currentLocation() const { return m_currentToken.location; }
+	std::string const& currentLiteral() const { return m_currentToken.literal; }
+	///@}
+
+	///@{
+	///@name Information about the current comment token
+
+	SourceLocation currentCommentLocation() const { return m_skippedComment.location; }
+	std::string const& currentCommentLiteral() const { return m_skippedComment.literal; }
+	/// Called by the parser during FunctionDefinition parsing to clear the current comment
+	void clearCurrentCommentLiteral() { m_skippedComment.literal.clear(); }
+
+	///@}
+
+	///@{
+	///@name Information about the next token
+
+	/// Returns the next token without advancing input.
+	Token::Value peekNextToken() const { return m_nextToken.token; }
+	SourceLocation peekLocation() const { return m_nextToken.location; }
+	std::string const& peekLiteral() const { return m_nextToken.literal; }
+	///@}
+
+	std::shared_ptr<std::string const> const& sourceName() const { return m_sourceName; }
+
+	///@{
+	///@name Error printing helper functions
+	/// Functions that help pretty-printing parse errors
+	/// Do only use in error cases, they are quite expensive.
+	std::string lineAtPosition(int _position) const { return m_source.lineAtPosition(_position); }
+	std::tuple<int, int> translatePositionToLineColumn(int _position) const { return m_source.translatePositionToLineColumn(_position); }
+	///@}
+
+private:
+	/// Used for the current and look-ahead token and comments
+	struct TokenDesc
+	{
+		Token::Value token;
+		SourceLocation location;
+		std::string literal;
+	};
+
+	///@{
+	///@name Literal buffer support
+	inline void addLiteralChar(char c) { m_nextToken.literal.push_back(c); }
+	inline void addCommentLiteralChar(char c) { m_nextSkippedComment.literal.push_back(c); }
+	inline void addLiteralCharAndAdvance() { addLiteralChar(m_char); advance(); }
+	///@}
+
+	bool advance() { m_char = m_source.advanceAndGet(); return !m_source.isPastEndOfInput(); }
+	void rollback(int _amount) { m_char = m_source.rollback(_amount); }
+
+	inline Token::Value selectToken(Token::Value _tok) { advance(); return _tok; }
+	/// If the next character is _next, advance and return _then, otherwise return _else.
+	inline Token::Value selectToken(char _next, Token::Value _then, Token::Value _else);
+
+	bool scanHexByte(char& o_scannedByte);
+
+	/// Scans a single Solidity token.
+	void scanToken();
+
+	/// Skips all whitespace and @returns true if something was skipped.
+	bool skipWhitespace();
+	/// Skips all whitespace except Line feeds and returns true if something was skipped
+	bool skipWhitespaceExceptLF();
+	Token::Value skipSingleLineComment();
+	Token::Value skipMultiLineComment();
+
+	void scanDecimalDigits();
+	Token::Value scanNumber(char _charSeen = 0);
+	Token::Value scanIdentifierOrKeyword();
+
+	Token::Value scanString();
+	Token::Value scanSingleLineDocComment();
+	Token::Value scanMultiLineDocComment();
+	/// Scans a slash '/' and depending on the characters returns the appropriate token
+	Token::Value scanSlash();
+
+	/// Scans an escape-sequence which is part of a string and adds the
+	/// decoded character to the current literal. Returns true if a pattern
+	/// is scanned.
+	bool scanEscape();
+
+	/// Return the current source position.
+	int sourcePos() { return m_source.position(); }
+	bool isSourcePastEndOfInput() { return m_source.isPastEndOfInput(); }
+
+	TokenDesc m_skippedComment;  // desc for current skipped comment
+	TokenDesc m_nextSkippedComment; // desc for next skiped comment
+
+	TokenDesc m_currentToken;  // desc for current token (as returned by Next())
+	TokenDesc m_nextToken;     // desc for next token (one token look-ahead)
+
+	CharStream m_source;
+	std::shared_ptr<std::string const> m_sourceName;
+
+	/// one character look-ahead, equals 0 at end of input
+	char m_char;
+};
+
+}
+}