sij/mapnik
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
mapnik/include/mapnik/ptree_helpers.hpp

431 lines
12 KiB
C++
Raw Blame History

/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 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_PTREE_HELPERS_HPP
#define MAPNIK_PTREE_HELPERS_HPP
// mapnik
#include <mapnik/enumeration.hpp>
#include <mapnik/config_error.hpp>
#include <mapnik/color_factory.hpp>
// boost
#include <boost/property_tree/ptree.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/optional.hpp>
// stl
#include <iostream>
#include <sstream>
namespace mapnik {
template <typename T>
T get(const boost::property_tree::ptree & node, const std::string & name, bool is_attribute,
const T & default_value);
template <typename T>
T get(const boost::property_tree::ptree & node, const std::string & name, bool is_attribute);
template <typename T>
T get_value(const boost::property_tree::ptree & node, const std::string & name);
template <typename T>
boost::optional<T> get_optional(const boost::property_tree::ptree & node, const std::string & name,
bool is_attribute);
template <typename T>
boost::optional<T> get_opt_attr( const boost::property_tree::ptree & node,
const std::string & name)
{
return get_optional<T>( node, name, true);
}
template <typename T>
boost::optional<T> get_opt_child( const boost::property_tree::ptree & node,
const std::string & name)
{
return get_optional<T>( node, name, false);
}
template <typename T>
T get_attr( const boost::property_tree::ptree & node, const std::string & name,
const T & default_value )
{
return get<T>( node, name, true, default_value);
}
template <typename T>
T get_attr( const boost::property_tree::ptree & node, const std::string & name )
{
return get<T>( node, name, true );
}
template <typename T>
T get_css( const boost::property_tree::ptree & node, const std::string & name )
{
return get_value<T>( node, std::string("CSS parameter '") + name + "'");
}
// specialization for color type
template <>
inline color get_css (boost::property_tree::ptree const& node, std::string const& name)
{
std::string str = get_value<std::string>( node, std::string("CSS parameter '") + name + "'"); ;
try
{
return mapnik::color_factory::from_string(str.c_str());
}
catch (...)
{
throw config_error(std::string("Failed to parse ") +
name + "'. Expected CSS color" +
" but got '" + str + "'");
}
}
template <typename charT, typename traits>
std::basic_ostream<charT, traits> &
operator << ( std::basic_ostream<charT, traits> & s, const mapnik::color & c )
{
std::string hex_string( c.to_string() );
s << hex_string;
return s;
}
/** Helper for class bool */
class boolean {
public:
boolean() {}
boolean(bool b) : b_(b) {}
boolean(const boolean & b) : b_(b.b_) {}
operator bool() const
{
return b_;
}
boolean & operator = (const boolean & other)
{
b_ = other.b_;
return * this;
}
boolean & operator = (bool other)
{
b_ = other;
return * this;
}
private:
bool b_;
};
/** Special stream input operator for boolean values */
template <typename charT, typename traits>
std::basic_istream<charT, traits> &
operator >> ( std::basic_istream<charT, traits> & s, boolean & b )
{
std::string word;
s >> word;
if ( s )
{
if ( word == "true" || word == "yes" || word == "on" ||
word == "1")
{
b = true;
}
else if ( word == "false" || word == "no" || word == "off" ||
word == "0")
{
b = false;
}
else
{
s.setstate( std::ios::failbit );
}
}
return s;
}
template <typename charT, typename traits>
std::basic_ostream<charT, traits> &
operator << ( std::basic_ostream<charT, traits> & s, const boolean & b )
{
s << ( b ? "true" : "false" );
return s;
}
template <typename T>
void set_attr(boost::property_tree::ptree & pt, const std::string & name, const T & v)
{
pt.put("<xmlattr>." + name, v);
}
/*
template <>
void set_attr<bool>(boost::property_tree::ptree & pt, const std::string & name, const bool & v)
{
pt.put("<xmlattr>." + name, boolean(v));
}
*/
class boolean;
template <typename T>
void set_css(boost::property_tree::ptree & pt, const std::string & name, const T & v)
{
boost::property_tree::ptree & css_node = pt.push_back(
boost::property_tree::ptree::value_type("CssParameter",
boost::property_tree::ptree()))->second;
css_node.put("<xmlattr>.name", name );
css_node.put_value( v );
}
template <typename T>
struct name_trait
{
static std::string name()
{
return "<unknown>";
}
// missing name_trait for type ...
// if you get here you are probably using a new type
// in the XML file. Just add a name trait for the new
// type below.
BOOST_STATIC_ASSERT( sizeof(T) == 0 );
};
#define DEFINE_NAME_TRAIT_WITH_NAME( type, type_name ) \
template <> \
struct name_trait<type> \
{ \
static std::string name() { return std::string("type ") + type_name; } \
};
#define DEFINE_NAME_TRAIT( type ) \
DEFINE_NAME_TRAIT_WITH_NAME( type, #type )
DEFINE_NAME_TRAIT( double )
DEFINE_NAME_TRAIT( float )
DEFINE_NAME_TRAIT( unsigned )
DEFINE_NAME_TRAIT( boolean )
DEFINE_NAME_TRAIT_WITH_NAME( int, "integer" )
DEFINE_NAME_TRAIT_WITH_NAME( std::string, "string" )
DEFINE_NAME_TRAIT_WITH_NAME( color, "color" )
template <typename ENUM, int MAX>
struct name_trait< mapnik::enumeration<ENUM, MAX> >
{
typedef enumeration<ENUM, MAX> Enum;
static std::string name()
{
std::string value_list("one of [");
for (unsigned i = 0; i < Enum::MAX; ++i)
{
value_list += Enum::get_string( i );
if ( i + 1 < Enum::MAX ) value_list += ", ";
}
value_list += "]";
return value_list;
}
};
template <typename T>
T get(const boost::property_tree::ptree & node, const std::string & name, bool is_attribute,
const T & default_value)
{
boost::optional<std::string> str;
if (is_attribute)
{
str = node.get_optional<std::string>( std::string("<xmlattr>.") + name );
}
else
{
str = node.get_optional<std::string>(name );
}
if ( str ) {
try
{
return boost::lexical_cast<T>( * str );
}
catch (const boost::bad_lexical_cast & )
{
throw config_error(std::string("Failed to parse ") +
(is_attribute ? "attribute" : "child node") + " '" +
name + "'. Expected " + name_trait<T>::name() +
" but got '" + *str + "'");
}
} else {
return default_value;
}
}
template <>
inline color get(boost::property_tree::ptree const& node, std::string const& name, bool is_attribute,
color const& default_value)
{
boost::optional<std::string> str;
if (is_attribute)
{
str = node.get_optional<std::string>( std::string("<xmlattr>.") + name );
}
else
{
str = node.get_optional<std::string>(name );
}
if ( str )
{
try
{
return mapnik::color_factory::from_string((*str).c_str());
}
catch (...)
{
throw config_error(std::string("Failed to parse ") +
(is_attribute ? "attribute" : "child node") + " '" +
name + "'. Expected " + name_trait<color>::name() +
" but got '" + *str + "'");
}
}
else
{
return default_value;
}
}
template <typename T>
T get(const boost::property_tree::ptree & node, const std::string & name, bool is_attribute)
{
boost::optional<std::string> str;
if (is_attribute)
{
str = node.get_optional<std::string>( std::string("<xmlattr>.") + name);
}
else
{
str = node.get_optional<std::string>(name);
}
if ( ! str ) {
throw config_error(std::string("Required ") +
(is_attribute ? "attribute " : "child node ") +
"'" + name + "' is missing");
}
try
{
return boost::lexical_cast<T>( *str );
}
catch (const boost::bad_lexical_cast & )
{
throw config_error(std::string("Failed to parse ") +
(is_attribute ? "attribute" : "child node") + " '" +
name + "'. Expected " + name_trait<T>::name() +
" but got '" + *str + "'");
}
}
template <typename T>
T get_value(const boost::property_tree::ptree & node, const std::string & name)
{
try
{
return node.get_value<T>();
}
catch (...)
{
throw config_error(std::string("Failed to parse ") +
name + ". Expected " + name_trait<T>::name() +
" but got '" + node.data() + "'");
}
}
template <typename T>
boost::optional<T> get_optional(const boost::property_tree::ptree & node, const std::string & name,
bool is_attribute)
{
boost::optional<std::string> str;
if (is_attribute)
{
str = node.get_optional<std::string>( std::string("<xmlattr>.") + name);
}
else
{
str = node.get_optional<std::string>(name);
}
boost::optional<T> result;
if ( str )
{
try
{
result = boost::lexical_cast<T>( *str );
}
catch (const boost::bad_lexical_cast &)
{
throw config_error(std::string("Failed to parse ") +
(is_attribute ? "attribute" : "child node") + " '" +
name + "'. Expected " + name_trait<T>::name() +
" but got '" + *str + "'");
}
}
return result;
}
//
template <>
inline boost::optional<color> get_optional(const boost::property_tree::ptree & node, const std::string & name,
bool is_attribute)
{
boost::optional<std::string> str;
if (is_attribute)
{
str = node.get_optional<std::string>( std::string("<xmlattr>.") + name);
}
else
{
str = node.get_optional<std::string>(name);
}
boost::optional<color> result;
if ( str )
{
try
{
//result = boost::lexical_cast<T>( *str );
result = mapnik::color_factory::from_string((*str).c_str());
}
catch (...)
{
throw config_error(std::string("Failed to parse ") +
(is_attribute ? "attribute" : "child node") + " '" +
name + "'. Expected " + name_trait<color>::name() +
" but got '" + *str + "'");
}
}
return result;
}
} // end of namespace mapnik
#endif // MAPNIK_PTREE_HELPERS_HPP
Reference in a new issue View git blame Copy permalink