mirror of
https://github.com/ethereum/solidity
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101 lines
3.5 KiB
C++
101 lines
3.5 KiB
C++
/*
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This file is part of solidity.
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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This file is derived from the file "scanner.h", which was part of the
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V8 project. The original copyright header follows:
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Copyright 2006-2012, the V8 project authors. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the following
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disclaimer in the documentation and/or other materials provided
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with the distribution.
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* Neither the name of Google Inc. nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* @author Christian <c@ethdev.com>
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* @date 2014
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* Solidity scanner.
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*/
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#pragma once
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#include <cstdint>
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#include <string>
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#include <tuple>
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namespace langutil
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{
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/**
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* Bidirectional stream of characters.
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*
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* This CharStream is used by lexical analyzers as the source.
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*/
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class CharStream
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{
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public:
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CharStream(): m_position(0) {}
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explicit CharStream(std::string const& _source, std::string const& name):
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m_source(_source), m_name(name), m_position(0) {}
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int position() const { return m_position; }
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bool isPastEndOfInput(size_t _charsForward = 0) const { return (m_position + _charsForward) >= m_source.size(); }
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char get(size_t _charsForward = 0) const { return m_source[m_position + _charsForward]; }
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char advanceAndGet(size_t _chars = 1);
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char rollback(size_t _amount);
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void reset() { m_position = 0; }
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std::string const& source() const noexcept { return m_source; }
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std::string const& name() const noexcept { return m_name; }
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///@{
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///@name Error printing helper functions
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/// Functions that help pretty-printing parse errors
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/// Do only use in error cases, they are quite expensive.
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std::string lineAtPosition(int _position) const;
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std::tuple<int, int> translatePositionToLineColumn(int _position) const;
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///@}
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private:
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std::string m_source;
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std::string m_name;
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size_t m_position;
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};
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}
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