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/*****************************************************************************
*
* 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
*
*****************************************************************************/
// mapnik
#include <mapnik/expression_string.hpp>
// boost
#include <boost/variant.hpp>
// icu
#include <unicode/uversion.h>
namespace mapnik
{
struct expression_string : boost::static_visitor<void>
{
explicit expression_string(std::string & str)
: str_(str) {}
void operator() (value_type const& x) const
{
str_ += x.to_expression_string() ;
}
void operator() (attribute const& attr) const
{
str_ += "[";
str_ += attr.name();
str_ += "]";
}
void operator() (geometry_type_attribute const& attr) const
{
str_ += "[mapnik::geometry_type]";
}
template <typename Tag>
void operator() (binary_node<Tag> const& x) const
{
if (x.type() != tags::mult::str() && x.type() != tags::div::str())
{
str_ += "(";
}
boost::apply_visitor(expression_string(str_),x.left);
str_ += x.type();
boost::apply_visitor(expression_string(str_),x.right);
if (x.type() != tags::mult::str() && x.type() != tags::div::str())
{
str_ += ")";
}
}
template <typename Tag>
void operator() (unary_node<Tag> const& x) const
{
str_ += Tag::str();
str_ += "(";
boost::apply_visitor(expression_string(str_),x.expr);
str_ += ")";
}
void operator() (regex_match_node const & x) const
{
boost::apply_visitor(expression_string(str_),x.expr);
str_ +=".match('";
#if defined(BOOST_REGEX_HAS_ICU)
std::string utf8;
UnicodeString ustr = UnicodeString::fromUTF32( &x.pattern.str()[0] ,x.pattern.str().length());
to_utf8(ustr,utf8);
str_ += utf8;
#else
str_ += x.pattern.str();
#endif
str_ +="')";
}
void operator() (regex_replace_node const & x) const
{
boost::apply_visitor(expression_string(str_),x.expr);
str_ +=".replace(";
str_ += "'";
#if defined(BOOST_REGEX_HAS_ICU)
std::string utf8;
UnicodeString ustr = UnicodeString::fromUTF32( &x.pattern.str()[0] ,x.pattern.str().length());
to_utf8(ustr,utf8);
str_ += utf8;
str_ +="','";
to_utf8(x.format ,utf8);
str_ += utf8;
#else
str_ += x.pattern.str();
str_ +="','";
str_ += x.pattern.str();
#endif
str_ +="')";
}
private:
std::string & str_;
};
std::string to_expression_string(expr_node const& node)
{
std::string str;
expression_string functor(str);
boost::apply_visitor(functor,node);
return str;
}
}
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