mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
97 lines
2.3 KiB
C++
97 lines
2.3 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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*/
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/**
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* String abstraction that avoids copies.
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*/
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#pragma once
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#include <boost/noncopyable.hpp>
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#include <map>
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#include <memory>
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#include <vector>
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#include <string>
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namespace dev
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{
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namespace yul
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{
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class YulStringRepository: boost::noncopyable
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{
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public:
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YulStringRepository(): m_strings{std::make_shared<std::string>()}
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{
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m_ids[std::string{}] = 0;
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}
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static YulStringRepository& instance()
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{
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static YulStringRepository inst;
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return inst;
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}
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size_t stringToId(std::string const& _string)
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{
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if (_string.empty())
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return 0;
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size_t& id = m_ids[_string];
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if (id == 0)
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{
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m_strings.emplace_back(std::make_shared<std::string>(_string));
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id = m_strings.size() - 1;
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}
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return id;
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}
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std::string const& idToString(size_t _id) const
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{
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return *m_strings.at(_id);
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}
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private:
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std::vector<std::shared_ptr<std::string>> m_strings;
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std::map<std::string, size_t> m_ids;
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};
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class YulString
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{
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public:
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YulString() = default;
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explicit YulString(std::string const& _s): m_id(YulStringRepository::instance().stringToId(_s)) {}
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YulString(YulString const&) = default;
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YulString(YulString&&) = default;
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YulString& operator=(YulString const&) = default;
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YulString& operator=(YulString&&) = default;
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/// This is not consistent with the string <-operator!
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bool operator<(YulString const& _other) const { return m_id < _other.m_id; }
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bool operator==(YulString const& _other) const { return m_id == _other.m_id; }
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bool operator!=(YulString const& _other) const { return m_id != _other.m_id; }
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bool empty() const { return m_id == 0; }
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std::string const& str() const
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{
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return YulStringRepository::instance().idToString(m_id);
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}
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private:
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/// ID of the string. Assumes that the empty string has ID zero.
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size_t m_id = 0;
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};
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}
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}
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