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+/*
+ This file is part of solidity.
+
+ solidity 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.
+
+ solidity 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 solidity. 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 <cstdint>
+#include <string>
+#include <tuple>
+
+namespace dev
+{
+namespace solidity
+{
+
+/**
+ * Bidirectional stream of characters.
+ *
+ * This CharStream is used by lexical analyzers as the source.
+ */
+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; }
+
+ std::string const& source() const { return m_source; }
+
+ ///@{
+ ///@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;
+};
+
+}
+}