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60 lines
2.4 KiB
C++
60 lines
2.4 KiB
C++
/* Copyright 2017, Michele Santullo
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* This file is part of "tawashi".
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*
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* "tawashi" 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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*
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* "tawashi" 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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*
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* You should have received a copy of the GNU General Public License
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* along with "tawashi". If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "split_get_vars.hpp"
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#include <boost/algorithm/string/finder.hpp>
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#include <boost/utility/string_ref.hpp>
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#include <boost/range/adaptor/transformed.hpp>
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#include <boost/range/adaptor/filtered.hpp>
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#include <ciso646>
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#include <boost/algorithm/string/find_iterator.hpp>
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#include <boost/range/iterator_range_core.hpp>
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#include <boost/range/algorithm/find.hpp>
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namespace tawashi {
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RawKeyValueList split_env_vars (const std::string& parList) {
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using MatchRange = boost::iterator_range<std::string::const_iterator>;
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using boost::token_finder;
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using boost::adaptors::transformed;
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using boost::adaptors::filtered;
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using boost::string_ref;
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using boost::split_iterator;
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using boost::make_iterator_range;
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using boost::range::find;
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//See:
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//https://stackoverflow.com/questions/27999941/how-to-use-boostsplit-with-booststring-ref-in-boost-1-55
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//http://www.boost.org/doc/libs/1_60_0/doc/html/boost/algorithm/token_finder.html
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//https://stackoverflow.com/questions/20781090/difference-between-boostsplit-vs-boostiter-split
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return boost::copy_range<RawKeyValueList>(
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make_iterator_range(
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split_iterator<std::string::const_iterator>(parList, token_finder([](char c){return '&'==c;})),
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split_iterator<std::string::const_iterator>()
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) |
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filtered([](const MatchRange& r){ return not r.empty(); }) |
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transformed([](const MatchRange& r){
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auto eq = find(r, '=');
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if (r.empty())
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return std::pair<string_ref, string_ref>();
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if (r.end() == eq)
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return std::make_pair(string_ref(&*r.begin(), r.size()), string_ref());
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else
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return std::make_pair(string_ref(&*r.begin(), eq - r.begin()), string_ref(&*(eq + 1), r.size() - (eq - r.begin() + 1)));
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})
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);
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}
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} //namespace tawashi
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