713 lines
15 KiB
C++
713 lines
15 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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//$Id$
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#ifndef VALUE_HPP
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#define VALUE_HPP
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// mapnik
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#include <mapnik/unicode.hpp>
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#include <mapnik/config_error.hpp>
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// boost
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#include <boost/variant.hpp>
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#include <boost/scoped_array.hpp>
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#include <boost/concept_check.hpp>
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// stl
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#include <iostream>
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#include <string>
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#include <sstream>
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#include <iomanip>
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#include <cmath>
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// uci
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#include <unicode/unistr.h>
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#include <unicode/ustring.h>
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namespace mapnik {
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inline void to_utf8(UnicodeString const& input, std::string & target)
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{
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if (input.length() == 0) return;
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const int BUF_SIZE = 256;
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char buf [BUF_SIZE];
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int len;
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UErrorCode err = U_ZERO_ERROR;
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u_strToUTF8(buf, BUF_SIZE, &len, input.getBuffer(), input.length(), &err);
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if (err == U_BUFFER_OVERFLOW_ERROR || err == U_STRING_NOT_TERMINATED_WARNING )
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{
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boost::scoped_array<char> buf_ptr(new char [len+1]);
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err = U_ZERO_ERROR;
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u_strToUTF8(buf_ptr.get() , len + 1, &len, input.getBuffer(), input.length(), &err);
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target.assign(buf_ptr.get() , len);
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}
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else
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{
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target.assign(buf, len);
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}
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}
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struct value_null {};
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typedef boost::variant<value_null,bool,int,double,UnicodeString> value_base;
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namespace impl {
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struct equals
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: public boost::static_visitor<bool>
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{
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template <typename T, typename U>
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bool operator() (const T &, const U &) const
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{
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return false;
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}
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template <typename T>
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bool operator() (T lhs, T rhs) const
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{
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return lhs == rhs;
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}
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bool operator() (int lhs, double rhs) const
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{
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return lhs == rhs;
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}
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bool operator() (double lhs, int rhs) const
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{
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return (lhs == rhs)? true : false ;
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}
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bool operator() (UnicodeString const& lhs,
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UnicodeString const& rhs) const
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{
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return (lhs == rhs) ? true: false;
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}
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bool operator() (value_null, value_null) const
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{
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return false;
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}
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};
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struct not_equals
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: public boost::static_visitor<bool>
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{
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template <typename T, typename U>
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bool operator() (const T &, const U &) const
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{
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return true;
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}
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template <typename T>
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bool operator() (T lhs, T rhs) const
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{
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return lhs != rhs;
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}
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bool operator() (int lhs, double rhs) const
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{
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return lhs != rhs;
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}
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bool operator() (double lhs, int rhs) const
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{
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return lhs != rhs;
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}
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bool operator() (UnicodeString const& lhs,
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UnicodeString const& rhs) const
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{
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return (lhs != rhs)? true : false;
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}
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bool operator() (value_null, value_null) const
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{
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return false;
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}
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template <typename T>
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bool operator() (value_null, const T &) const
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{
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return false;
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}
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template <typename T>
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bool operator() (const T &, value_null) const
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{
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return false;
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}
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};
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struct greater_than
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: public boost::static_visitor<bool>
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{
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template <typename T, typename U>
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bool operator()(const T &, const U &) const
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{
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return false;
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}
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template <typename T>
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bool operator()(T lhs, T rhs) const
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{
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return lhs > rhs;
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}
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bool operator() (int lhs, double rhs) const
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{
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return lhs > rhs;
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}
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bool operator() (double lhs, int rhs) const
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{
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return lhs > rhs;
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}
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bool operator() (UnicodeString const& lhs, UnicodeString const& rhs) const
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{
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return (lhs > rhs) ? true : false ;
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}
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bool operator() (value_null, value_null) const
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{
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return false;
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}
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};
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struct greater_or_equal
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: public boost::static_visitor<bool>
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{
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template <typename T, typename U>
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bool operator()(const T &, const U &) const
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{
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return false;
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}
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template <typename T>
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bool operator() (T lhs, T rhs) const
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{
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return lhs >= rhs;
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}
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bool operator() (int lhs, double rhs) const
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{
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return lhs >= rhs;
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}
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bool operator() (double lhs, int rhs) const
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{
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return lhs >= rhs;
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}
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bool operator() (UnicodeString const& lhs, UnicodeString const& rhs) const
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{
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return ( lhs >= rhs ) ? true : false ;
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}
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bool operator() (value_null, value_null) const
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{
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return false;
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}
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};
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struct less_than
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: public boost::static_visitor<bool>
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{
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template <typename T, typename U>
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bool operator()(const T &, const U &) const
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{
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return false;
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}
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template <typename T>
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bool operator()(T lhs, T rhs) const
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{
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return lhs < rhs;
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}
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bool operator() (int lhs, double rhs) const
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{
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return lhs < rhs;
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}
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bool operator() (double lhs, int rhs) const
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{
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return lhs < rhs;
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}
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bool operator()(UnicodeString const& lhs,
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UnicodeString const& rhs ) const
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{
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return (lhs < rhs) ? true : false ;
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}
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bool operator() (value_null, value_null) const
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{
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return false;
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}
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};
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struct less_or_equal
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: public boost::static_visitor<bool>
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{
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template <typename T, typename U>
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bool operator()(const T &, const U &) const
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{
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return false;
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}
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template <typename T>
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bool operator()(T lhs, T rhs) const
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{
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return lhs <= rhs;
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}
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bool operator() (int lhs, double rhs) const
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{
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return lhs <= rhs;
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}
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bool operator() (double lhs, int rhs) const
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{
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return lhs <= rhs;
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}
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bool operator()(UnicodeString const& lhs,
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UnicodeString const& rhs ) const
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{
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return (lhs <= rhs) ? true : false ;
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}
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bool operator() (value_null, value_null) const
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{
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return false;
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}
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};
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template <typename V>
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struct add : public boost::static_visitor<V>
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{
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typedef V value_type;
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template <typename T1, typename T2>
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value_type operator() (T1 const& lhs, T2 const&) const
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{
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return lhs;
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}
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template <typename T>
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value_type operator() (T lhs, T rhs) const
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{
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return lhs + rhs ;
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}
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value_type operator() (UnicodeString const& lhs ,
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UnicodeString const& rhs ) const
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{
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return lhs + rhs;
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}
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value_type operator() (double lhs, int rhs) const
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{
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return lhs + rhs;
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}
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value_type operator() (int lhs, double rhs) const
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{
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return lhs + rhs;
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}
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};
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template <typename V>
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struct sub : public boost::static_visitor<V>
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{
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typedef V value_type;
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template <typename T1, typename T2>
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value_type operator() (T1 const& lhs, T2 const&) const
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{
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return lhs;
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}
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template <typename T>
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value_type operator() (T lhs, T rhs) const
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{
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return lhs - rhs ;
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}
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value_type operator() (UnicodeString const& lhs,
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UnicodeString const& ) const
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{
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return lhs;
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}
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value_type operator() (double lhs, int rhs) const
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{
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return lhs - rhs;
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}
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value_type operator() (int lhs, double rhs) const
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{
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return lhs - rhs;
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}
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};
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template <typename V>
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struct mult : public boost::static_visitor<V>
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{
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typedef V value_type;
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template <typename T1, typename T2>
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value_type operator() (T1 const& lhs , T2 const& ) const
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{
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return lhs;
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}
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template <typename T>
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value_type operator() (T lhs, T rhs) const
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{
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return lhs * rhs;
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}
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value_type operator() (UnicodeString const& lhs,
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UnicodeString const& ) const
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{
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return lhs;
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}
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value_type operator() (double lhs, int rhs) const
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{
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return lhs * rhs;
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}
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value_type operator() (int lhs, double rhs) const
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{
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return lhs * rhs;
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}
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};
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template <typename V>
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struct div: public boost::static_visitor<V>
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{
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typedef V value_type;
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template <typename T1, typename T2>
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value_type operator() (T1 const& lhs, T2 const&) const
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{
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return lhs;
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}
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template <typename T>
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value_type operator() (T lhs, T rhs) const
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{
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return lhs / rhs;
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}
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value_type operator() (bool lhs, bool rhs ) const
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{
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boost::ignore_unused_variable_warning(lhs);
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boost::ignore_unused_variable_warning(rhs);
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return false;
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}
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value_type operator() (UnicodeString const& lhs,
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UnicodeString const&) const
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{
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return lhs;
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}
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value_type operator() (double lhs, int rhs) const
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{
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return lhs / rhs;
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}
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value_type operator() (int lhs, double rhs) const
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{
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return lhs / rhs;
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}
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};
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template <typename V>
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struct mod: public boost::static_visitor<V>
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{
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typedef V value_type;
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template <typename T1, typename T2>
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value_type operator() (T1 const& lhs, T2 const&) const
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{
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return lhs;
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}
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template <typename T>
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value_type operator() (T lhs, T rhs) const
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{
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return lhs % rhs;
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}
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value_type operator() (UnicodeString const& lhs,
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UnicodeString const&) const
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{
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return lhs;
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}
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value_type operator() (bool lhs,
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bool rhs) const
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{
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boost::ignore_unused_variable_warning(lhs);
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boost::ignore_unused_variable_warning(rhs);
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return false;
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}
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value_type operator() (double lhs, int rhs) const
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{
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return std::fmod(lhs, rhs);
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}
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value_type operator() (int lhs, double rhs) const
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{
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return std::fmod(lhs, rhs);
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}
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value_type operator() (double lhs, double rhs) const
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{
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return std::fmod(lhs, rhs);
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}
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};
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struct to_bool : public boost::static_visitor<bool>
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{
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template <typename T>
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bool operator() (T val) const
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{
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boost::ignore_unused_variable_warning(val);
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throw config_error("Boolean value expected");
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}
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bool operator() (bool val) const
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{
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return val;
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}
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};
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struct to_string : public boost::static_visitor<std::string>
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{
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template <typename T>
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std::string operator() (T val) const
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{
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std::stringstream ss;
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ss << val;
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return ss.str();
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}
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// specializations
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std::string operator() (UnicodeString const& val) const
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{
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std::string utf8;
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to_utf8(val,utf8);
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return utf8;
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}
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std::string operator() (double val) const
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{
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std::stringstream ss;
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ss << std::setprecision(16) << val;
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return ss.str();
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}
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std::string operator() (value_null const& val) const
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{
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boost::ignore_unused_variable_warning(val);
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return "";
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}
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};
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struct to_unicode : public boost::static_visitor<UnicodeString>
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{
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template <typename T>
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UnicodeString operator() (T val) const
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{
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std::basic_ostringstream<char> out;
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out << val;
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return UnicodeString(out.str().c_str());
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}
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// specializations
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UnicodeString const& operator() (UnicodeString const& val) const
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{
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return val;
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}
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UnicodeString operator() (double val) const
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{
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std::basic_ostringstream<char> out;
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out << std::setprecision(16) << val;
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return UnicodeString(out.str().c_str());
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}
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UnicodeString operator() (value_null const& val) const
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{
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boost::ignore_unused_variable_warning(val);
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return UnicodeString("");
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}
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};
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struct to_expression_string : public boost::static_visitor<std::string>
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{
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std::string operator() (UnicodeString const& val) const
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{
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std::string utf8;
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to_utf8(val,utf8);
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return "'" + utf8 + "'";
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}
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std::string operator() (double val) const
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{
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std::stringstream ss;
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ss << std::setprecision(16) << val;
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return ss.str();
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}
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std::string operator() (value_null const& val) const
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{
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boost::ignore_unused_variable_warning(val);
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return "null";
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}
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template <typename T>
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std::string operator() (T val) const
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{
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std::stringstream ss;
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ss << val;
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return ss.str();
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}
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};
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}
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class value
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{
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value_base base_;
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friend const value operator+(value const&,value const&);
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friend const value operator-(value const&,value const&);
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friend const value operator*(value const&,value const&);
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friend const value operator/(value const&,value const&);
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friend const value operator%(value const&,value const&);
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public:
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value ()
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: base_(value_null()) {}
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template <typename T> value(T _val_)
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: base_(_val_) {}
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bool operator==(value const& other) const
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{
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return boost::apply_visitor(impl::equals(),base_,other.base_);
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}
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bool operator!=(value const& other) const
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{
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return boost::apply_visitor(impl::not_equals(),base_,other.base_);
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}
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bool operator>(value const& other) const
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{
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return boost::apply_visitor(impl::greater_than(),base_,other.base_);
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}
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bool operator>=(value const& other) const
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{
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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_);
|
|
}
|
|
};
|
|
|
|
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 //VALUE_HPP
|