532 lines
13 KiB
C++
532 lines
13 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2006 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
|
|
*
|
|
*****************************************************************************/
|
|
//$Id$
|
|
|
|
#ifndef VALUE_HPP
|
|
#define VALUE_HPP
|
|
|
|
// stl
|
|
#include <iostream>
|
|
#include <string>
|
|
#include <sstream>
|
|
#include <iomanip>
|
|
|
|
// boost
|
|
#include <boost/variant.hpp>
|
|
// mapnik
|
|
#include <mapnik/unicode.hpp>
|
|
|
|
namespace mapnik {
|
|
|
|
typedef boost::variant<int,double,std::wstring> value_base;
|
|
|
|
namespace impl {
|
|
struct equals
|
|
: public boost::static_visitor<bool>
|
|
{
|
|
template <typename T, typename U>
|
|
bool operator() (const T &, const U & ) const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator() (T lhs, T rhs) const
|
|
{
|
|
return lhs == rhs;
|
|
}
|
|
|
|
bool operator() (int lhs, double rhs) const
|
|
{
|
|
return lhs == rhs;
|
|
}
|
|
|
|
bool operator() (double lhs, int rhs) const
|
|
{
|
|
return lhs == rhs;
|
|
}
|
|
|
|
bool operator() (std::wstring const& lhs,
|
|
std::wstring const& rhs) const
|
|
{
|
|
return lhs == rhs;
|
|
}
|
|
};
|
|
|
|
struct greater_than
|
|
: public boost::static_visitor<bool>
|
|
{
|
|
template <typename T, typename U>
|
|
bool operator()( const T &, const U & ) const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator()( T lhs, T rhs ) const
|
|
{
|
|
return lhs > rhs;
|
|
}
|
|
|
|
bool operator() (int lhs, double rhs) const
|
|
{
|
|
return lhs > rhs;
|
|
}
|
|
|
|
bool operator() (double lhs, int rhs) const
|
|
{
|
|
return lhs > rhs;
|
|
}
|
|
|
|
bool operator() (std::wstring const& lhs, std::wstring const& rhs) const
|
|
{
|
|
return lhs > rhs;
|
|
}
|
|
};
|
|
|
|
struct greater_or_equal
|
|
: public boost::static_visitor<bool>
|
|
{
|
|
template <typename T, typename U>
|
|
bool operator()( const T &, const U & ) const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator() (T lhs, T rhs) const
|
|
{
|
|
return lhs >= rhs;
|
|
}
|
|
|
|
bool operator() (int lhs, double rhs) const
|
|
{
|
|
return lhs >= rhs;
|
|
}
|
|
|
|
bool operator() (double lhs, int rhs) const
|
|
{
|
|
return lhs >= rhs;
|
|
}
|
|
|
|
bool operator() (std::wstring const& lhs, std::wstring const& rhs ) const
|
|
{
|
|
return lhs >= rhs;
|
|
}
|
|
};
|
|
|
|
struct less_than
|
|
: public boost::static_visitor<bool>
|
|
{
|
|
template <typename T, typename U>
|
|
bool operator()( const T &, const U & ) const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator()( T lhs,T rhs) const
|
|
{
|
|
return lhs < rhs;
|
|
}
|
|
|
|
bool operator() (int lhs, double rhs) const
|
|
{
|
|
return lhs < rhs;
|
|
}
|
|
|
|
bool operator() (double lhs, int rhs) const
|
|
{
|
|
return lhs < rhs;
|
|
}
|
|
|
|
bool operator()( std::wstring const& lhs,
|
|
std::wstring const& rhs ) const
|
|
{
|
|
return lhs < rhs;
|
|
}
|
|
};
|
|
|
|
struct less_or_equal
|
|
: public boost::static_visitor<bool>
|
|
{
|
|
template <typename T, typename U>
|
|
bool operator()( const T &, const U & ) const
|
|
{
|
|
return false;
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator()(T lhs, T rhs ) const
|
|
{
|
|
return lhs <= rhs;
|
|
}
|
|
|
|
bool operator() (int lhs, double rhs) const
|
|
{
|
|
return lhs <= rhs;
|
|
}
|
|
|
|
bool operator() (double lhs, int rhs) const
|
|
{
|
|
return lhs <= rhs;
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator()( std::wstring const& lhs,
|
|
std::wstring const& rhs ) const
|
|
{
|
|
return lhs <= rhs;
|
|
}
|
|
};
|
|
|
|
template <typename V>
|
|
struct add : public boost::static_visitor<V>
|
|
{
|
|
typedef V value_type;
|
|
template <typename T1, typename T2>
|
|
value_type operator() (T1 const& lhs, T2 const&) const
|
|
{
|
|
return lhs;
|
|
}
|
|
template <typename T>
|
|
value_type operator() (T lhs, T rhs) const
|
|
{
|
|
return lhs + rhs ;
|
|
}
|
|
|
|
value_type operator() (std::wstring const& lhs ,
|
|
std::wstring const& rhs ) const
|
|
{
|
|
return lhs + rhs;
|
|
}
|
|
|
|
value_type operator() (double lhs, int rhs) const
|
|
{
|
|
return lhs + rhs;
|
|
}
|
|
|
|
value_type operator() (int lhs, double rhs) const
|
|
{
|
|
return lhs + rhs;
|
|
}
|
|
};
|
|
template <typename V>
|
|
struct sub : public boost::static_visitor<V>
|
|
{
|
|
typedef V value_type;
|
|
template <typename T1, typename T2>
|
|
value_type operator() (T1 const& lhs, T2 const&) const
|
|
{
|
|
return lhs;
|
|
}
|
|
|
|
template <typename T>
|
|
value_type operator() (T lhs, T rhs) const
|
|
{
|
|
return lhs - rhs ;
|
|
}
|
|
|
|
value_type operator() (std::wstring const& lhs,
|
|
std::wstring const& ) const
|
|
{
|
|
return lhs;
|
|
}
|
|
|
|
value_type operator() (double lhs, int rhs) const
|
|
{
|
|
return lhs - rhs;
|
|
}
|
|
|
|
value_type operator() (int lhs, double rhs) const
|
|
{
|
|
return lhs - rhs;
|
|
}
|
|
};
|
|
|
|
template <typename V>
|
|
struct mult : public boost::static_visitor<V>
|
|
{
|
|
typedef V value_type;
|
|
template <typename T1, typename T2>
|
|
value_type operator() (T1 const& lhs , T2 const& ) const
|
|
{
|
|
return lhs;
|
|
}
|
|
template <typename T>
|
|
value_type operator() (T lhs, T rhs) const
|
|
{
|
|
return lhs * rhs;
|
|
}
|
|
|
|
value_type operator() (std::wstring const& lhs,
|
|
std::wstring const& ) const
|
|
{
|
|
return lhs;
|
|
}
|
|
|
|
value_type operator() (double lhs, int rhs) const
|
|
{
|
|
return lhs * rhs;
|
|
}
|
|
|
|
value_type operator() (int lhs, double rhs) const
|
|
{
|
|
return lhs * rhs;
|
|
}
|
|
};
|
|
|
|
template <typename V>
|
|
struct div: public boost::static_visitor<V>
|
|
{
|
|
typedef V value_type;
|
|
template <typename T1, typename T2>
|
|
value_type operator() (T1 const& lhs, T2 const&) const
|
|
{
|
|
return lhs;
|
|
}
|
|
|
|
template <typename T>
|
|
value_type operator() (T lhs, T rhs) const
|
|
{
|
|
return lhs / rhs;
|
|
}
|
|
|
|
value_type operator() (std::wstring const& lhs,
|
|
std::wstring const&) const
|
|
{
|
|
return lhs;
|
|
}
|
|
|
|
value_type operator() (double lhs, int rhs) const
|
|
{
|
|
return lhs / rhs;
|
|
}
|
|
|
|
value_type operator() (int lhs, double rhs) const
|
|
{
|
|
return lhs / rhs;
|
|
}
|
|
};
|
|
|
|
struct to_string : public boost::static_visitor<std::string>
|
|
{
|
|
|
|
template <typename T>
|
|
std::string operator() (T val) const
|
|
{
|
|
std::stringstream ss;
|
|
ss << val;
|
|
return ss.str();
|
|
}
|
|
// specializations
|
|
std::string operator() (std::wstring const& val) const
|
|
{
|
|
std::stringstream ss;
|
|
std::wstring::const_iterator pos = val.begin();
|
|
ss << std::hex ;
|
|
for (;pos!=val.end();++pos)
|
|
{
|
|
wchar_t c = *pos;
|
|
if (c < 0x80)
|
|
{
|
|
ss << char(c);
|
|
}
|
|
else
|
|
{
|
|
ss << "\\x";
|
|
unsigned c0 = (c >> 8) & 0xff;
|
|
if (c0) ss << c0;
|
|
ss << (c & 0xff);
|
|
}
|
|
}
|
|
return ss.str();
|
|
}
|
|
|
|
std::string operator() (double val) const
|
|
{
|
|
std::stringstream ss;
|
|
ss << std::setprecision(16) << val;
|
|
return ss.str();
|
|
}
|
|
};
|
|
|
|
struct to_unicode : public boost::static_visitor<std::wstring>
|
|
{
|
|
|
|
template <typename T>
|
|
std::wstring operator() (T val) const
|
|
{
|
|
std::basic_ostringstream<wchar_t> out;
|
|
out << val;
|
|
return out.str();
|
|
}
|
|
// specializations
|
|
std::wstring const& operator() (std::wstring const& val) const
|
|
{
|
|
return val;
|
|
}
|
|
};
|
|
|
|
struct to_expression_string : public boost::static_visitor<std::string>
|
|
{
|
|
std::string operator() (std::wstring const& val) const
|
|
{
|
|
std::stringstream ss;
|
|
std::wstring::const_iterator pos = val.begin();
|
|
ss << std::hex ;
|
|
for (;pos!=val.end();++pos)
|
|
{
|
|
wchar_t c = *pos;
|
|
if (c < 0x80)
|
|
{
|
|
ss << char(c);
|
|
}
|
|
else
|
|
{
|
|
ss << "\\x";
|
|
unsigned c0 = (c >> 8) & 0xff;
|
|
if (c0) ss << c0;
|
|
ss << (c & 0xff);
|
|
}
|
|
}
|
|
return "\'" + ss.str() + "\'";
|
|
}
|
|
|
|
template <typename T>
|
|
std::string operator() (T val) const
|
|
{
|
|
std::stringstream ss;
|
|
ss << val;
|
|
return ss.str();
|
|
}
|
|
|
|
std::string operator() (double val) const
|
|
{
|
|
std::stringstream ss;
|
|
ss << std::setprecision(16) << val;
|
|
return ss.str();
|
|
}
|
|
};
|
|
}
|
|
|
|
class value
|
|
{
|
|
value_base base_;
|
|
friend const value operator+(value const&,value const&);
|
|
friend const value operator-(value const&,value const&);
|
|
friend const value operator*(value const&,value const&);
|
|
friend const value operator/(value const&,value const&);
|
|
|
|
public:
|
|
value ()
|
|
: base_(0) {}
|
|
|
|
template <typename T> value(T _val_)
|
|
: base_(_val_) {}
|
|
|
|
bool operator==(value const& other) const
|
|
{
|
|
return boost::apply_visitor(impl::equals(),base_,other.base_);
|
|
}
|
|
|
|
bool operator!=(value const& other) const
|
|
{
|
|
return !(boost::apply_visitor(impl::equals(),base_,other.base_));
|
|
}
|
|
|
|
bool operator>(value const& other) const
|
|
{
|
|
return boost::apply_visitor(impl::greater_than(),base_,other.base_);
|
|
}
|
|
|
|
bool operator>=(value const& other) const
|
|
{
|
|
return boost::apply_visitor(impl::greater_or_equal(),base_,other.base_);
|
|
}
|
|
|
|
bool operator<(value const& other) const
|
|
{
|
|
return boost::apply_visitor(impl::less_than(),base_,other.base_);
|
|
}
|
|
|
|
bool operator<=(value const& other) const
|
|
{
|
|
return boost::apply_visitor(impl::less_or_equal(),base_,other.base_);
|
|
}
|
|
|
|
value_base const& base() const
|
|
{
|
|
return base_;
|
|
}
|
|
|
|
std::string to_expression_string() const
|
|
{
|
|
return boost::apply_visitor(impl::to_expression_string(),base_);
|
|
}
|
|
|
|
std::string to_string() const
|
|
{
|
|
return boost::apply_visitor(impl::to_string(),base_);
|
|
}
|
|
|
|
std::wstring to_unicode() const
|
|
{
|
|
return boost::apply_visitor(impl::to_unicode(),base_);
|
|
}
|
|
};
|
|
|
|
inline const value operator+(value const& p1,value const& p2)
|
|
{
|
|
|
|
return value(boost::apply_visitor(impl::add<value>(),p1.base_, p2.base_));
|
|
}
|
|
|
|
inline const value operator-(value const& p1,value const& p2)
|
|
{
|
|
|
|
return value(boost::apply_visitor(impl::sub<value>(),p1.base_, p2.base_));
|
|
}
|
|
|
|
inline const value operator*(value const& p1,value const& p2)
|
|
{
|
|
|
|
return value(boost::apply_visitor(impl::mult<value>(),p1.base_, p2.base_));
|
|
}
|
|
|
|
inline const value operator/(value const& p1,value const& p2)
|
|
{
|
|
|
|
return value(boost::apply_visitor(impl::div<value>(),p1.base_, p2.base_));
|
|
}
|
|
|
|
template <typename charT, typename traits>
|
|
inline std::basic_ostream<charT,traits>&
|
|
operator << (std::basic_ostream<charT,traits>& out,
|
|
value const& v)
|
|
{
|
|
out << v.to_string();
|
|
return out;
|
|
}
|
|
}
|
|
|
|
#endif //VALUE_HPP
|