mapnik/src/transform_expression_grammar.cpp

/*****************************************************************************
 *
 * This file is part of Mapnik (c++ mapping toolkit)
 *
 * Copyright (C) 2012 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
 *
 *****************************************************************************/
 
#include <mapnik/transform_expression_grammar.hpp>

// boost
#include <boost/version.hpp>

namespace mapnik {

namespace qi = boost::spirit::qi;

template <typename Iterator>
transform_expression_grammar<Iterator>::transform_expression_grammar(expression_grammar<Iterator> const& g)
        : transform_expression_grammar::base_type(start)
{
    using boost::phoenix::construct;
    using qi::_a; using qi::_1; using qi::_4;
    using qi::_b; using qi::_2; using qi::_5;
    using qi::_c; using qi::_3; using qi::_6;
    using qi::_val;
    using qi::char_;
    using qi::lit;
    using qi::no_case;
#if BOOST_VERSION > 104200
    using qi::no_skip;
    start = transform_ % no_skip[char_(", ")] ;
#else
    using qi::lexeme;
    start = transform_ % lexeme[char_(", ")] ;
#endif

    transform_ = matrix | translate | scale | rotate | skewX | skewY ;

    matrix = no_case[lit("matrix")]
        >> (lit('(')
            >> expr >> -lit(',')
            >> expr >> -lit(',')
            >> expr >> -lit(',')
            >> expr >> -lit(',')
            >> expr >> -lit(',')
            >> expr >>  lit(')'))
        [ _val = construct<matrix_node>(_1,_2,_3,_4,_5,_6) ];

    translate = no_case[lit("translate")]
        >> (lit('(')
            >> expr >> -lit(',')
            >> -expr >> lit(')'))
        [ _val = construct<translate_node>(_1,_2) ];

    scale = no_case[lit("scale")]
        >> (lit('(')
            >> expr >> -lit(',')
            >> -expr >> lit(')'))
        [ _val = construct<scale_node>(_1,_2) ];

    rotate = no_case[lit("rotate")]
        >> lit('(')
        >> expr[_a = _1] >> -lit(',')
        >> -(expr [_b = _1] >> -lit(',') >> expr[_c = _1])
        >> lit(')')
        [ _val = construct<rotate_node>(_a,_b,_c) ];

    skewX = no_case[lit("skewX")]
        >> lit('(')
        >> expr [ _val = construct<skewX_node>(_1) ]
        >> lit(')');

    skewY = no_case[lit("skewY")]
        >> lit('(')
        >> expr [ _val = construct<skewY_node>(_1) ]
        >> lit(')');

    expr = g.expr.alias();
}

template struct mapnik::transform_expression_grammar<std::string::const_iterator>;

}