826 lines
19 KiB
C++
826 lines
19 KiB
C++
/*****************************************************************************
|
|
*
|
|
* 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_VALUE_HPP
|
|
#define MAPNIK_VALUE_HPP
|
|
|
|
// mapnik
|
|
#include <mapnik/global.hpp>
|
|
#include <mapnik/unicode.hpp>
|
|
#include <mapnik/config_error.hpp>
|
|
|
|
// boost
|
|
#include <boost/variant.hpp>
|
|
#include <boost/scoped_array.hpp>
|
|
#include <boost/concept_check.hpp>
|
|
#include <boost/lexical_cast.hpp>
|
|
|
|
// stl
|
|
#include <iostream>
|
|
#include <string>
|
|
#include <sstream>
|
|
#include <iomanip>
|
|
#include <cmath>
|
|
|
|
// uci
|
|
#include <unicode/unistr.h>
|
|
#include <unicode/ustring.h>
|
|
|
|
|
|
namespace mapnik {
|
|
|
|
inline void to_utf8(UnicodeString const& input, std::string & target)
|
|
{
|
|
if (input.length() == 0) return;
|
|
|
|
const int BUF_SIZE = 256;
|
|
char buf [BUF_SIZE];
|
|
int len;
|
|
|
|
UErrorCode err = U_ZERO_ERROR;
|
|
u_strToUTF8(buf, BUF_SIZE, &len, input.getBuffer(), input.length(), &err);
|
|
if (err == U_BUFFER_OVERFLOW_ERROR || err == U_STRING_NOT_TERMINATED_WARNING )
|
|
{
|
|
boost::scoped_array<char> buf_ptr(new char [len+1]);
|
|
err = U_ZERO_ERROR;
|
|
u_strToUTF8(buf_ptr.get() , len + 1, &len, input.getBuffer(), input.length(), &err);
|
|
target.assign(buf_ptr.get() , len);
|
|
}
|
|
else
|
|
{
|
|
target.assign(buf, len);
|
|
}
|
|
}
|
|
|
|
struct value_null {};
|
|
|
|
typedef boost::variant<value_null,bool,int,double,UnicodeString> 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)? true : false ;
|
|
}
|
|
|
|
bool operator() (UnicodeString const& lhs,
|
|
UnicodeString const& rhs) const
|
|
{
|
|
return (lhs == rhs) ? true: false;
|
|
}
|
|
|
|
bool operator() (value_null, value_null) const
|
|
{
|
|
// this changed from false to true - https://github.com/mapnik/mapnik/issues/794
|
|
return true;
|
|
}
|
|
};
|
|
|
|
struct not_equals
|
|
: public boost::static_visitor<bool>
|
|
{
|
|
template <typename T, typename U>
|
|
bool operator() (const T &, const U &) const
|
|
{
|
|
return true;
|
|
}
|
|
|
|
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() (UnicodeString const& lhs,
|
|
UnicodeString const& rhs) const
|
|
{
|
|
return (lhs != rhs)? true : false;
|
|
}
|
|
|
|
bool operator() (value_null, value_null) const
|
|
{
|
|
// TODO - needs review - https://github.com/mapnik/mapnik/issues/794
|
|
return false;
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator() (value_null, const T &) const
|
|
{
|
|
// TODO - needs review - https://github.com/mapnik/mapnik/issues/794
|
|
return false;
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator() (const T &, value_null) const
|
|
{
|
|
// TODO - needs review - https://github.com/mapnik/mapnik/issues/794
|
|
return false;
|
|
}
|
|
};
|
|
|
|
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() (UnicodeString const& lhs, UnicodeString const& rhs) const
|
|
{
|
|
return (lhs > rhs) ? true : false ;
|
|
}
|
|
|
|
bool operator() (value_null, value_null) const
|
|
{
|
|
return false;
|
|
}
|
|
};
|
|
|
|
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() (UnicodeString const& lhs, UnicodeString const& rhs) const
|
|
{
|
|
return ( lhs >= rhs ) ? true : false ;
|
|
}
|
|
|
|
bool operator() (value_null, value_null) const
|
|
{
|
|
return false;
|
|
}
|
|
};
|
|
|
|
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()(UnicodeString const& lhs,
|
|
UnicodeString const& rhs ) const
|
|
{
|
|
return (lhs < rhs) ? true : false ;
|
|
}
|
|
|
|
bool operator() (value_null, value_null) const
|
|
{
|
|
return false;
|
|
}
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
bool operator()(UnicodeString const& lhs,
|
|
UnicodeString const& rhs ) const
|
|
{
|
|
return (lhs <= rhs) ? true : false ;
|
|
}
|
|
|
|
bool operator() (value_null, value_null) const
|
|
{
|
|
return false;
|
|
}
|
|
};
|
|
|
|
template <typename V>
|
|
struct add : public boost::static_visitor<V>
|
|
{
|
|
typedef V value_type;
|
|
|
|
template <typename T>
|
|
value_type operator() (T lhs, T rhs) const
|
|
{
|
|
return lhs + rhs ;
|
|
}
|
|
|
|
value_type operator() (UnicodeString const& lhs ,
|
|
UnicodeString 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 R>
|
|
value_type operator() (UnicodeString const& lhs, R const& rhs) const
|
|
{
|
|
std::basic_ostringstream<char> out;
|
|
out << rhs;
|
|
return lhs + UnicodeString(out.str().c_str());
|
|
}
|
|
|
|
template <typename L>
|
|
value_type operator() (L const& lhs , UnicodeString const& rhs) const
|
|
{
|
|
std::basic_ostringstream<char> out;
|
|
out << lhs;
|
|
return UnicodeString(out.str().c_str()) + rhs;
|
|
}
|
|
|
|
template <typename T1, typename T2>
|
|
value_type operator() (T1 const& lhs, T2 const&) const
|
|
{
|
|
return lhs;
|
|
}
|
|
};
|
|
|
|
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() (UnicodeString const& lhs,
|
|
UnicodeString 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() (UnicodeString const& lhs,
|
|
UnicodeString 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() (bool lhs, bool rhs ) const
|
|
{
|
|
boost::ignore_unused_variable_warning(lhs);
|
|
boost::ignore_unused_variable_warning(rhs);
|
|
return false;
|
|
}
|
|
|
|
value_type operator() (UnicodeString const& lhs,
|
|
UnicodeString 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 mod: 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() (UnicodeString const& lhs,
|
|
UnicodeString const&) const
|
|
{
|
|
return lhs;
|
|
}
|
|
|
|
value_type operator() (bool lhs,
|
|
bool rhs) const
|
|
{
|
|
boost::ignore_unused_variable_warning(lhs);
|
|
boost::ignore_unused_variable_warning(rhs);
|
|
return false;
|
|
}
|
|
|
|
value_type operator() (double lhs, int rhs) const
|
|
{
|
|
return std::fmod(lhs, rhs);
|
|
}
|
|
|
|
value_type operator() (int lhs, double rhs) const
|
|
{
|
|
return std::fmod(lhs, rhs);
|
|
}
|
|
|
|
value_type operator() (double lhs, double rhs) const
|
|
{
|
|
return std::fmod(lhs, rhs);
|
|
}
|
|
};
|
|
|
|
struct to_bool : public boost::static_visitor<bool>
|
|
{
|
|
bool operator() (bool val) const
|
|
{
|
|
return val;
|
|
}
|
|
|
|
bool operator() (UnicodeString const& ustr) const
|
|
{
|
|
boost::ignore_unused_variable_warning(ustr);
|
|
return true;
|
|
}
|
|
|
|
bool operator() (value_null const& val) const
|
|
{
|
|
boost::ignore_unused_variable_warning(val);
|
|
return false;
|
|
}
|
|
|
|
template <typename T>
|
|
bool operator() (T val) const
|
|
{
|
|
return val > 0 ? true : false;
|
|
}
|
|
};
|
|
|
|
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() (UnicodeString const& val) const
|
|
{
|
|
std::string utf8;
|
|
to_utf8(val,utf8);
|
|
return utf8;
|
|
}
|
|
|
|
std::string operator() (double val) const
|
|
{
|
|
std::stringstream ss;
|
|
ss << std::setprecision(16) << val;
|
|
return ss.str();
|
|
}
|
|
|
|
std::string operator() (value_null const& val) const
|
|
{
|
|
boost::ignore_unused_variable_warning(val);
|
|
return "";
|
|
}
|
|
};
|
|
|
|
struct to_unicode : public boost::static_visitor<UnicodeString>
|
|
{
|
|
|
|
template <typename T>
|
|
UnicodeString operator() (T val) const
|
|
{
|
|
std::basic_ostringstream<char> out;
|
|
out << val;
|
|
return UnicodeString(out.str().c_str());
|
|
}
|
|
|
|
// specializations
|
|
UnicodeString const& operator() (UnicodeString const& val) const
|
|
{
|
|
return val;
|
|
}
|
|
|
|
UnicodeString operator() (double val) const
|
|
{
|
|
std::basic_ostringstream<char> out;
|
|
out << std::setprecision(16) << val;
|
|
return UnicodeString(out.str().c_str());
|
|
}
|
|
|
|
UnicodeString operator() (value_null const& val) const
|
|
{
|
|
boost::ignore_unused_variable_warning(val);
|
|
return UnicodeString("");
|
|
}
|
|
};
|
|
|
|
struct to_expression_string : public boost::static_visitor<std::string>
|
|
{
|
|
std::string operator() (UnicodeString const& val) const
|
|
{
|
|
std::string utf8;
|
|
to_utf8(val,utf8);
|
|
return "'" + utf8 + "'";
|
|
}
|
|
|
|
std::string operator() (double val) const
|
|
{
|
|
std::stringstream ss;
|
|
ss << std::setprecision(16) << val;
|
|
return ss.str();
|
|
}
|
|
|
|
std::string operator() (bool val) const
|
|
{
|
|
return val ? "true":"false";
|
|
}
|
|
|
|
std::string operator() (value_null const& val) const
|
|
{
|
|
boost::ignore_unused_variable_warning(val);
|
|
return "null";
|
|
}
|
|
|
|
template <typename T>
|
|
std::string operator() (T val) const
|
|
{
|
|
std::stringstream ss;
|
|
ss << val;
|
|
return ss.str();
|
|
}
|
|
};
|
|
|
|
struct to_double : public boost::static_visitor<double>
|
|
{
|
|
double operator() (int val) const
|
|
{
|
|
return static_cast<double>(val);
|
|
}
|
|
|
|
double operator() (double val) const
|
|
{
|
|
return val;
|
|
}
|
|
|
|
double operator() (std::string const& val) const
|
|
{
|
|
return boost::lexical_cast<double>(val);
|
|
}
|
|
double operator() (UnicodeString const& val) const
|
|
{
|
|
std::string utf8;
|
|
to_utf8(val,utf8);
|
|
return boost::lexical_cast<double>(utf8);
|
|
}
|
|
|
|
double operator() (value_null const& val) const
|
|
{
|
|
boost::ignore_unused_variable_warning(val);
|
|
return 0.0;
|
|
}
|
|
};
|
|
|
|
struct to_int : public boost::static_visitor<double>
|
|
{
|
|
int operator() (int val) const
|
|
{
|
|
return val;
|
|
}
|
|
|
|
int operator() (double val) const
|
|
{
|
|
return rint(val);
|
|
}
|
|
|
|
int operator() (std::string const& val) const
|
|
{
|
|
return boost::lexical_cast<int>(val);
|
|
}
|
|
int operator() (UnicodeString const& val) const
|
|
{
|
|
std::string utf8;
|
|
to_utf8(val,utf8);
|
|
return boost::lexical_cast<int>(utf8);
|
|
}
|
|
|
|
int operator() (value_null const& val) const
|
|
{
|
|
boost::ignore_unused_variable_warning(val);
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
}
|
|
|
|
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&);
|
|
friend const value operator%(value const&,value const&);
|
|
|
|
public:
|
|
value ()
|
|
: base_(value_null()) {}
|
|
|
|
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::not_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_;
|
|
}
|
|
|
|
bool to_bool() const
|
|
{
|
|
return boost::apply_visitor(impl::to_bool(),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_);
|
|
}
|
|
|
|
UnicodeString to_unicode() const
|
|
{
|
|
return boost::apply_visitor(impl::to_unicode(),base_);
|
|
}
|
|
|
|
double to_double() const
|
|
{
|
|
return boost::apply_visitor(impl::to_double(),base_);
|
|
}
|
|
|
|
double to_int() const
|
|
{
|
|
return boost::apply_visitor(impl::to_int(),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_));
|
|
}
|
|
|
|
inline const value operator%(value const& p1,value const& p2)
|
|
{
|
|
|
|
return value(boost::apply_visitor(impl::mod<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 // MAPNIK_VALUE_HPP
|