246 lines
7.3 KiB
C++
246 lines
7.3 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2024 Artem Pavlenko
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#ifndef MAPNIK_XML_ATTRIBUTE_CAST_HPP
|
|
#define MAPNIK_XML_ATTRIBUTE_CAST_HPP
|
|
|
|
// mapnik
|
|
#include <mapnik/debug.hpp>
|
|
#include <mapnik/value/types.hpp>
|
|
#include <mapnik/xml_tree.hpp>
|
|
#include <mapnik/enumeration.hpp>
|
|
#include <mapnik/boolean.hpp>
|
|
#include <mapnik/color.hpp>
|
|
#include <mapnik/color_factory.hpp>
|
|
#include <mapnik/expression.hpp>
|
|
#include <mapnik/util/conversions.hpp>
|
|
#include <mapnik/attribute.hpp>
|
|
#include <mapnik/text/font_feature_settings.hpp>
|
|
|
|
// stl
|
|
#include <string>
|
|
#include <map>
|
|
#include <typeinfo>
|
|
#include <utility>
|
|
#include <optional>
|
|
#include <stdexcept>
|
|
|
|
namespace mapnik {
|
|
namespace detail {
|
|
|
|
template<typename T>
|
|
struct do_xml_attribute_cast
|
|
{
|
|
static inline std::optional<T> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& /*source*/)
|
|
{
|
|
std::string err_msg("No conversion from std::string to ");
|
|
err_msg += std::string(typeid(T).name());
|
|
throw std::runtime_error(err_msg);
|
|
}
|
|
};
|
|
|
|
// specialization for mapnik::boolean_type
|
|
template<>
|
|
struct do_xml_attribute_cast<mapnik::boolean_type>
|
|
{
|
|
static inline std::optional<mapnik::boolean_type> xml_attribute_cast_impl(xml_tree const& /*tree*/,
|
|
std::string const& source)
|
|
{
|
|
bool result;
|
|
if (mapnik::util::string2bool(source, result))
|
|
return result;
|
|
return std::nullopt;
|
|
}
|
|
};
|
|
|
|
// specialization for mapnik::value_bool
|
|
template<>
|
|
struct do_xml_attribute_cast<mapnik::value_bool>
|
|
{
|
|
static inline std::optional<mapnik::value_bool> xml_attribute_cast_impl(xml_tree const& /*tree*/,
|
|
std::string const& source)
|
|
{
|
|
bool result;
|
|
if (mapnik::util::string2bool(source, result))
|
|
return result;
|
|
return std::nullopt;
|
|
}
|
|
};
|
|
|
|
// specialization for int
|
|
template<>
|
|
struct do_xml_attribute_cast<int>
|
|
{
|
|
static inline std::optional<int> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
|
|
{
|
|
int result;
|
|
if (mapnik::util::string2int(source, result))
|
|
return result;
|
|
return std::nullopt;
|
|
}
|
|
};
|
|
|
|
#ifdef BIGINT
|
|
// specialization for long long
|
|
template<>
|
|
struct do_xml_attribute_cast<mapnik::value_integer>
|
|
{
|
|
static inline std::optional<mapnik::value_integer> xml_attribute_cast_impl(xml_tree const& /*tree*/,
|
|
std::string const& source)
|
|
{
|
|
int result;
|
|
if (mapnik::util::string2int(source, result))
|
|
return result;
|
|
return std::nullopt;
|
|
}
|
|
};
|
|
|
|
#endif
|
|
|
|
// specialization for unsigned
|
|
|
|
template<>
|
|
struct do_xml_attribute_cast<unsigned>
|
|
{
|
|
static inline std::optional<unsigned> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
|
|
{
|
|
int result;
|
|
if (mapnik::util::string2int(source, result) && result >= 0)
|
|
return static_cast<unsigned>(result);
|
|
return std::nullopt;
|
|
}
|
|
};
|
|
|
|
// specialization for float
|
|
template<>
|
|
struct do_xml_attribute_cast<float>
|
|
{
|
|
static inline std::optional<float> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
|
|
{
|
|
float result;
|
|
if (mapnik::util::string2float(source, result))
|
|
return result;
|
|
return std::nullopt;
|
|
}
|
|
};
|
|
|
|
// specialization for double
|
|
template<>
|
|
struct do_xml_attribute_cast<double>
|
|
{
|
|
static inline std::optional<double> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
|
|
{
|
|
double result;
|
|
if (mapnik::util::string2double(source, result))
|
|
return result;
|
|
return std::nullopt;
|
|
}
|
|
};
|
|
|
|
// specialization for mapnik::enumeration<...>
|
|
template<typename ENUM,
|
|
char const* (*F_TO_STRING)(ENUM),
|
|
ENUM (*F_FROM_STRING)(const char*),
|
|
std::map<ENUM, std::string> (*F_LOOKUP)()>
|
|
struct do_xml_attribute_cast<mapnik::enumeration<ENUM, F_TO_STRING, F_FROM_STRING, F_LOOKUP>>
|
|
{
|
|
using Enum = mapnik::enumeration<ENUM, F_TO_STRING, F_FROM_STRING, F_LOOKUP>;
|
|
static inline std::optional<Enum> xml_attribute_cast_impl(xml_tree const& /*tree*/, std::string const& source)
|
|
{
|
|
try
|
|
{
|
|
Enum e;
|
|
e.from_string(source);
|
|
return e;
|
|
}
|
|
catch (illegal_enum_value const& ex)
|
|
{
|
|
MAPNIK_LOG_ERROR(do_xml_attribute_cast) << ex.what();
|
|
return std::nullopt;
|
|
;
|
|
}
|
|
}
|
|
};
|
|
|
|
// specialization for mapnik::color
|
|
template<>
|
|
struct do_xml_attribute_cast<mapnik::color>
|
|
{
|
|
static inline std::optional<mapnik::color> xml_attribute_cast_impl(xml_tree const&, std::string const& source)
|
|
{
|
|
return parse_color(source);
|
|
}
|
|
};
|
|
|
|
// specialization for std::string
|
|
template<>
|
|
struct do_xml_attribute_cast<std::string>
|
|
{
|
|
static inline std::optional<std::string> xml_attribute_cast_impl(xml_tree const&, std::string const& source)
|
|
{
|
|
return source;
|
|
}
|
|
};
|
|
|
|
// specialization for mapnik::expression_ptr
|
|
template<>
|
|
struct do_xml_attribute_cast<mapnik::expression_ptr>
|
|
{
|
|
static inline std::optional<mapnik::expression_ptr> xml_attribute_cast_impl(xml_tree const& tree,
|
|
std::string const& source)
|
|
{
|
|
std::map<std::string, mapnik::expression_ptr>::const_iterator itr = tree.expr_cache_.find(source);
|
|
if (itr != tree.expr_cache_.end())
|
|
{
|
|
return itr->second;
|
|
}
|
|
else
|
|
{
|
|
mapnik::expression_ptr expr = parse_expression(source);
|
|
tree.expr_cache_.emplace(source, expr);
|
|
return expr;
|
|
}
|
|
}
|
|
};
|
|
|
|
// specialization for mapnik::font_feature_settings
|
|
template<>
|
|
struct do_xml_attribute_cast<mapnik::font_feature_settings>
|
|
{
|
|
static inline std::optional<mapnik::font_feature_settings> xml_attribute_cast_impl(xml_tree const&,
|
|
std::string const& source)
|
|
{
|
|
return mapnik::font_feature_settings(source);
|
|
}
|
|
};
|
|
|
|
} // end namespace detail
|
|
|
|
template<typename T>
|
|
std::optional<T> xml_attribute_cast(xml_tree const& tree, std::string const& source)
|
|
{
|
|
return detail::do_xml_attribute_cast<T>::xml_attribute_cast_impl(tree, source);
|
|
}
|
|
|
|
} // end namespace mapnik
|
|
|
|
#endif // MAPNIK_XML_ATTRIBUTE_CAST_HPP
|