233 lines
6.8 KiB
C++
233 lines
6.8 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2021 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// NOTE: This is an implementation header file and is only meant to be included
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// from implementation files. It therefore doesn't have an include guard.
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// mapnik
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#include <mapnik/params.hpp>
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#include <mapnik/value/types.hpp>
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#include <mapnik/boolean.hpp>
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#include <mapnik/util/conversions.hpp>
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#include <mapnik/warning.hpp>
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MAPNIK_DISABLE_WARNING_PUSH
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#include <mapnik/warning_ignore.hpp>
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#include <boost/lexical_cast.hpp>
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MAPNIK_DISABLE_WARNING_POP
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// stl
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#include <string>
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#include <sstream>
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#include <stdexcept>
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#include <optional>
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namespace mapnik {
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namespace detail {
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template<typename T>
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struct extract_value
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{
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static inline std::optional<T> do_extract_from_string(std::string const& /*source*/)
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{
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std::ostringstream s;
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s << "No conversion from std::string to " << typeid(T).name();
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throw std::runtime_error(s.str());
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}
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static inline std::optional<T> do_extract_from_bool(value_bool const& /*source*/)
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{
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std::ostringstream s;
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s << "No conversion from boolean to " << typeid(T).name();
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throw std::runtime_error(s.str());
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}
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};
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template<>
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struct extract_value<value_bool>
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{
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static inline std::optional<value_bool> do_extract_from_string(std::string const& source)
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{
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bool result;
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if (mapnik::util::string2bool(source, result))
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return std::optional<value_bool>(result);
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return std::nullopt;
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}
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static inline std::optional<value_bool> do_extract_from_bool(value_bool const& source) { return source; }
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};
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template<>
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struct extract_value<mapnik::boolean_type>
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{
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static inline std::optional<mapnik::boolean_type> do_extract_from_string(std::string const& source)
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{
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bool result;
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if (mapnik::util::string2bool(source, result))
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return std::optional<mapnik::boolean_type>(result);
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return std::nullopt;
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}
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static inline std::optional<mapnik::boolean_type> do_extract_from_bool(value_bool const& source)
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{
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return std::optional<mapnik::boolean_type>(source);
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}
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};
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template<>
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struct extract_value<mapnik::value_integer>
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{
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static inline std::optional<mapnik::value_integer> do_extract_from_string(std::string const& source)
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{
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mapnik::value_integer result;
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if (mapnik::util::string2int(source, result))
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return std::optional<mapnik::value_integer>(result);
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return std::nullopt;
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}
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static inline std::optional<mapnik::value_integer> do_extract_from_bool(value_bool const& source)
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{
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return std::optional<mapnik::value_integer>(boost::lexical_cast<mapnik::value_integer>(source));
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}
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};
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template<>
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struct extract_value<mapnik::value_double>
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{
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static inline std::optional<mapnik::value_double> do_extract_from_string(std::string const& source)
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{
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mapnik::value_double result;
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if (mapnik::util::string2double(source, result))
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return std::optional<double>(result);
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return std::nullopt;
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}
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static inline std::optional<mapnik::value_double> do_extract_from_bool(value_bool const& source)
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{
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return std::optional<double>(boost::lexical_cast<double>(source));
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}
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};
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template<>
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struct extract_value<mapnik::value_null>
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{
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static inline std::optional<mapnik::value_null> do_extract_from_string(std::string const&)
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{
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return std::nullopt; // FIXME
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}
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static inline std::optional<mapnik::value_null> do_extract_from_bool(value_bool const&)
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{
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return std::nullopt; // FIXME
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}
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};
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template<>
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struct extract_value<std::string>
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{
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static inline std::optional<std::string> do_extract_from_string(std::string const& source)
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{
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return std::optional<std::string>(source);
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}
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static inline std::optional<std::string> do_extract_from_bool(value_bool const& source)
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{
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return source ? "true" : "false";
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}
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};
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template<typename T>
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std::optional<T> param_cast(std::string const& source)
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{
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return extract_value<T>::do_extract_from_string(source);
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}
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template<typename T>
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std::optional<T> param_cast(value_bool const& source)
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{
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return extract_value<T>::do_extract_from_bool(source);
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}
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} // end namespace detail
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template<typename T>
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struct value_extractor_visitor
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{
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value_extractor_visitor(std::optional<T>& var)
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: var_(var)
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{}
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void operator()(std::string const& val) const { var_ = detail::param_cast<T>(val); }
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void operator()(value_bool const& val) const { var_ = detail::param_cast<T>(val); }
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template<typename T1>
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void operator()(T1 const& val) const
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{
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try
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{
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var_ = boost::lexical_cast<T>(val);
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}
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catch (boost::bad_lexical_cast const&)
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{
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std::ostringstream s;
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s << "Failed converting from " << typeid(T1).name() << " to " << typeid(T).name();
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throw std::runtime_error(s.str());
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}
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}
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std::optional<T>& var_;
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};
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namespace params_detail {
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template<typename T>
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struct converter
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{
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using value_type = T;
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using return_type = std::optional<value_type>;
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static return_type
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extract(parameters const& params, std::string const& name, std::optional<T> const& default_opt_value)
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{
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std::optional<T> result(default_opt_value);
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parameters::const_iterator itr = params.find(name);
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if (itr != params.end())
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{
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util::apply_visitor(value_extractor_visitor<T>(result), itr->second);
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}
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return result;
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}
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};
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} // end namespace params_detail
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template<typename T>
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std::optional<T> parameters::get(std::string const& key) const
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{
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return params_detail::converter<T>::extract(*this, key, std::nullopt);
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}
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template<typename T>
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std::optional<T> parameters::get(std::string const& key, T const& default_opt_value) const
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{
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return params_detail::converter<T>::extract(*this, key, std::optional<T>(default_opt_value));
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}
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} // namespace mapnik
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