228 lines
6.9 KiB
C++
228 lines
6.9 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) 2015 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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#ifndef MAPNIK_XML_ATTRIBUTE_CAST_HPP
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#define MAPNIK_XML_ATTRIBUTE_CAST_HPP
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//mapnik
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#include <mapnik/debug.hpp>
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#include <mapnik/value_types.hpp>
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#include <mapnik/xml_tree.hpp>
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#include <mapnik/enumeration.hpp>
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#include <mapnik/boolean.hpp>
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#include <mapnik/color.hpp>
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#include <mapnik/color_factory.hpp>
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#include <mapnik/expression.hpp>
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#include <mapnik/util/conversions.hpp>
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#include <mapnik/attribute.hpp>
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#include <mapnik/text/font_feature_settings.hpp>
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// boost
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wsign-conversion"
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#include <boost/optional.hpp>
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#pragma GCC diagnostic pop
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// stl
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#include <string>
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#include <map>
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#include <typeinfo>
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#include <utility>
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#include <stdexcept>
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namespace mapnik { namespace detail {
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template <typename T>
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struct do_xml_attribute_cast
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{
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static inline boost::optional<T> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& /*source*/)
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{
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std::string err_msg("No conversion from std::string to");
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err_msg += std::string(typeid(T).name());
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throw std::runtime_error(err_msg);
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}
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};
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// specialization for mapnik::boolean_type
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template <>
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struct do_xml_attribute_cast<mapnik::boolean_type>
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{
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static inline boost::optional<mapnik::boolean_type> xml_attribute_cast_impl(xml_tree const& /*tree*/, 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 boost::optional<mapnik::boolean_type>(result);
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return boost::optional<mapnik::boolean_type>();
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}
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};
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// specialization for int
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template <>
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struct do_xml_attribute_cast<int>
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{
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static inline boost::optional<int> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
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{
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int result;
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if (mapnik::util::string2int(source, result))
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return boost::optional<int>(result);
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return boost::optional<int>();
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}
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};
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#ifdef BIGINT
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// specialization for long long
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template <>
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struct do_xml_attribute_cast<mapnik::value_integer>
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{
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static inline boost::optional<mapnik::value_integer> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
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{
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int result;
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if (mapnik::util::string2int(source, result))
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return boost::optional<mapnik::value_integer>(result);
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return boost::optional<mapnik::value_integer>();
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}
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};
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#endif
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// specialization for unsigned
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template <>
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struct do_xml_attribute_cast<unsigned>
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{
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static inline boost::optional<unsigned> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
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{
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int result;
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if (mapnik::util::string2int(source, result) && result >= 0)
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return boost::optional<unsigned>(static_cast<unsigned>(result));
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return boost::optional<unsigned>();
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}
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};
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// specialization for float
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template <>
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struct do_xml_attribute_cast<float>
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{
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static inline boost::optional<float> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
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{
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float result;
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if (mapnik::util::string2float(source, result))
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return boost::optional<float>(result);
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return boost::optional<float>();
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}
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};
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// specialization for double
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template <>
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struct do_xml_attribute_cast<double>
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{
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static inline boost::optional<double> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
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{
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double result;
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if (mapnik::util::string2double(source, result))
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return boost::optional<double>(result);
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return boost::optional<double>();
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}
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};
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// specialization for mapnik::enumeration<T,int>
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template <typename T, int MAX>
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struct do_xml_attribute_cast<mapnik::enumeration<T,MAX> >
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{
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static inline boost::optional<mapnik::enumeration<T,MAX> > xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
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{
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using result_type = typename boost::optional<mapnik::enumeration<T,MAX> >;
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try
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{
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mapnik::enumeration<T,MAX> e;
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e.from_string(source);
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return result_type(e);
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}
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catch (illegal_enum_value const& ex)
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{
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MAPNIK_LOG_ERROR(do_xml_attribute_cast) << ex.what();
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return result_type();
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}
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}
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};
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// specialization for mapnik::color
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template <>
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struct do_xml_attribute_cast<mapnik::color>
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{
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static inline boost::optional<mapnik::color> xml_attribute_cast_impl(xml_tree const&, std::string const& source)
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{
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return parse_color(source);
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}
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};
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// specialization for std::string
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template <>
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struct do_xml_attribute_cast<std::string>
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{
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static inline boost::optional<std::string> xml_attribute_cast_impl(xml_tree const&, std::string const& source)
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{
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return boost::optional<std::string>(source);
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}
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};
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// specialization for mapnik::expression_ptr
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template <>
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struct do_xml_attribute_cast<mapnik::expression_ptr>
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{
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static inline boost::optional<mapnik::expression_ptr> xml_attribute_cast_impl(xml_tree const& tree, std::string const& source)
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{
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std::map<std::string,mapnik::expression_ptr>::const_iterator itr = tree.expr_cache_.find(source);
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if (itr != tree.expr_cache_.end())
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{
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return itr->second;
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}
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else
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{
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mapnik::expression_ptr expr = parse_expression(source);
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tree.expr_cache_.emplace(source,expr);
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return expr;
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}
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}
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};
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// specialization for mapnik::font_feature_settings
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template <>
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struct do_xml_attribute_cast<mapnik::font_feature_settings>
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{
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static inline boost::optional<mapnik::font_feature_settings> xml_attribute_cast_impl(xml_tree const&, std::string const& source)
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{
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return mapnik::font_feature_settings(source);
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}
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};
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} // end namespace detail
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template <typename T>
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boost::optional<T> xml_attribute_cast(xml_tree const& tree, std::string const& source)
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{
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return detail::do_xml_attribute_cast<T>::xml_attribute_cast_impl(tree, source);
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}
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} // end namespace mapnik
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#endif // MAPNIK_XML_ATTRIBUTE_CAST_HPP
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