360 lines
11 KiB
C++
360 lines
11 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) 2006 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_CONFIG_HELPERS_INCLUDED
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#define MAPNIK_CONFIG_HELPERS_INCLUDED
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#include <mapnik/enumeration.hpp>
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#include <mapnik/config_error.hpp>
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#include <mapnik/color_factory.hpp>
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#include <boost/property_tree/ptree.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/optional.hpp>
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#include <iostream>
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#include <sstream>
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namespace mapnik {
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template <typename T>
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T get(const boost::property_tree::ptree & node, const std::string & name, bool is_attribute,
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const T & default_value);
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template <typename T>
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T get(const boost::property_tree::ptree & node, const std::string & name, bool is_attribute);
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template <typename T>
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T get_own(const boost::property_tree::ptree & node, const std::string & name);
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template <typename T>
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boost::optional<T> get_optional(const boost::property_tree::ptree & node, const std::string & name,
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bool is_attribute);
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template <typename T>
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boost::optional<T> get_opt_attr( const boost::property_tree::ptree & node,
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const std::string & name)
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{
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return get_optional<T>( node, name, true);
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}
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template <typename T>
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boost::optional<T> get_opt_child( const boost::property_tree::ptree & node,
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const std::string & name)
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{
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return get_optional<T>( node, name, false);
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}
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template <typename T>
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T get_attr( const boost::property_tree::ptree & node, const std::string & name,
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const T & default_value )
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{
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return get<T>( node, name, true, default_value);
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}
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template <typename T>
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T get_attr( const boost::property_tree::ptree & node, const std::string & name )
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{
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return get<T>( node, name, true );
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}
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template <typename T>
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T get_css( const boost::property_tree::ptree & node, const std::string & name )
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{
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return get_own<T>( node, std::string("CSS parameter '") + name + "'");
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}
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/** Stream input operator for Color values */
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template <typename charT, typename traits>
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std::basic_istream<charT, traits> &
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operator >> ( std::basic_istream<charT, traits> & s, mapnik::Color & c )
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{
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std::string word;
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s >> word;
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if ( s )
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{
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try
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{
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c = mapnik::color_factory::from_string( word.c_str() );
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}
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catch (...)
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{
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s.setstate( std::ios::failbit );
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}
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}
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return s;
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}
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template <typename charT, typename traits>
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std::basic_ostream<charT, traits> &
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operator << ( std::basic_ostream<charT, traits> & s, const mapnik::Color & c )
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{
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std::string hex_string( c.to_hex_string() );
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s << hex_string;
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return s;
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}
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/** Helper for class bool */
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class boolean {
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public:
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boolean() {}
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boolean(bool b) : b_(b) {}
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boolean(const boolean & b) : b_(b.b_) {}
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operator bool() const
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{
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return b_;
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}
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boolean & operator = (const boolean & other)
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{
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b_ = other.b_;
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return * this;
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}
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boolean & operator = (bool other)
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{
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b_ = other;
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return * this;
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}
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private:
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bool b_;
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};
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/** Special stream input operator for boolean values */
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template <typename charT, typename traits>
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std::basic_istream<charT, traits> &
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operator >> ( std::basic_istream<charT, traits> & s, boolean & b )
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{
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std::string word;
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s >> word;
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if ( s )
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{
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if ( word == "true" || word == "yes" || word == "on" ||
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word == "1")
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{
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b = true;
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}
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else if ( word == "false" || word == "no" || word == "off" ||
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word == "0")
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{
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b = false;
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}
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else
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{
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s.setstate( std::ios::failbit );
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}
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}
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return s;
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}
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template <typename charT, typename traits>
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std::basic_ostream<charT, traits> &
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operator << ( std::basic_ostream<charT, traits> & s, const boolean & b )
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{
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s << ( b ? "true" : "false" );
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return s;
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}
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template <typename T>
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void set_attr(boost::property_tree::ptree & pt, const std::string & name, const T & v)
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{
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pt.put("<xmlattr>." + name, v);
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}
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/*
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template <>
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void set_attr<bool>(boost::property_tree::ptree & pt, const std::string & name, const bool & v)
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{
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pt.put("<xmlattr>." + name, boolean(v));
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}
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*/
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class boolean;
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template <typename T>
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void set_css(boost::property_tree::ptree & pt, const std::string & name, const T & v)
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{
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boost::property_tree::ptree & css_node = pt.push_back(
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boost::property_tree::ptree::value_type("CssParameter",
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boost::property_tree::ptree()))->second;
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css_node.put("<xmlattr>.name", name );
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css_node.put_own( v );
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}
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template <typename T>
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struct name_trait
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{
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static const char * name()
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{
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return "<unknown>";
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}
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// missing name_trait for type ...
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// if you get here you are probably using a new type
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// in the XML file. Just add a name trait for the new
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// type below.
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BOOST_STATIC_ASSERT( sizeof(T) == 0 );
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};
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#define DEFINE_NAME_TRAIT_WITH_NAME( type, type_name ) \
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template <> \
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struct name_trait<type> \
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{ \
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static const char * name() { return "type " type_name; } \
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};
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#define DEFINE_NAME_TRAIT( type ) \
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DEFINE_NAME_TRAIT_WITH_NAME( type, #type );
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DEFINE_NAME_TRAIT( double );
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DEFINE_NAME_TRAIT( float );
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DEFINE_NAME_TRAIT( unsigned );
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DEFINE_NAME_TRAIT( boolean );
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DEFINE_NAME_TRAIT_WITH_NAME( int, "integer" );
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DEFINE_NAME_TRAIT_WITH_NAME( std::string, "string" );
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DEFINE_NAME_TRAIT_WITH_NAME( Color, "color" );
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template <typename ENUM, int MAX>
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struct name_trait< enumeration<ENUM, MAX> >
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{
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typedef enumeration<ENUM, MAX> Enum;
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static const char * name()
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{
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std::string value_list("one of [");
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for (unsigned i = 0; i < Enum::MAX; ++i)
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{
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value_list += Enum::get_string( i );
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if ( i + 1 < Enum::MAX ) value_list += ", ";
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}
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value_list += "]";
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return value_list.c_str();
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}
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};
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template <typename T>
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T get(const boost::property_tree::ptree & node, const std::string & name, bool is_attribute,
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const T & default_value)
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{
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boost::optional<std::string> str;
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if (is_attribute)
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{
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str = node.get_optional<std::string>( std::string("<xmlattr>.") + name );
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}
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else
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{
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str = node.get_optional<std::string>(name );
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}
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if ( str ) {
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try
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{
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return boost::lexical_cast<T>( * str );
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}
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catch (const boost::bad_lexical_cast & ex)
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{
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throw config_error(string("Failed to parse ") +
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(is_attribute ? "attribute" : "child node") + " '" +
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name + "'. Expected " + name_trait<T>::name() +
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" but got '" + *str + "'");
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}
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} else {
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return default_value;
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}
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}
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template <typename T>
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T get(const boost::property_tree::ptree & node, const std::string & name, bool is_attribute)
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{
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boost::optional<std::string> str;
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if (is_attribute)
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{
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str = node.get_optional<std::string>( std::string("<xmlattr>.") + name);
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}
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else
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{
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str = node.get_optional<std::string>(name);
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}
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if ( ! str ) {
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throw config_error(string("Required ") +
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(is_attribute ? "attribute " : "child node ") +
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"'" + name + "' is missing");
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}
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try
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{
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return boost::lexical_cast<T>( *str );
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}
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catch (const boost::bad_lexical_cast & ex)
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{
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throw config_error(string("Failed to parse ") +
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(is_attribute ? "attribute" : "child node") + " '" +
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name + "'. Expected " + name_trait<T>::name() +
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" but got '" + *str + "'");
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}
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}
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template <typename T>
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T get_own(const boost::property_tree::ptree & node, const std::string & name)
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{
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try
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{
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return node.get_own<T>();
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}
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catch (...)
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{
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throw config_error(string("Failed to parse ") +
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name + ". Expected " + name_trait<T>::name() +
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" but got '" + node.data() + "'");
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}
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}
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template <typename T>
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boost::optional<T> get_optional(const boost::property_tree::ptree & node, const std::string & name,
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bool is_attribute)
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{
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boost::optional<std::string> str;
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if (is_attribute)
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{
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str = node.get_optional<std::string>( std::string("<xmlattr>.") + name);
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}
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else
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{
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str = node.get_optional<std::string>(name);
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}
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boost::optional<T> result;
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if ( str ) {
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try
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{
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result = boost::lexical_cast<T>( *str );
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}
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catch (const boost::bad_lexical_cast & ex)
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{
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throw config_error(string("Failed to parse ") +
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(is_attribute ? "attribute" : "child node") + " '" +
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name + "'. Expected " + name_trait<T>::name() +
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" but got '" + *str + "'");
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}
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}
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return result;
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}
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} // end of namespace mapnik
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#endif // MAPNIK_CONFIG_HELPERS_INCLUDED
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