8c1e69fdb8
- construct on first use - allows for faster map loading and unloading of xml loading tree - modified expression and transform grammars to not take args/not crash - simplifies interfaces, allows fast parsing from python without passing grammar instance
132 lines
4.4 KiB
C++
132 lines
4.4 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) 2012 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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// mapnik
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#include <mapnik/transform_expression_grammar.hpp>
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// boost
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#include <boost/spirit/include/qi.hpp>
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#include <boost/spirit/include/phoenix_operator.hpp>
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#include <boost/spirit/include/phoenix_object.hpp>
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namespace mapnik {
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namespace qi = boost::spirit::qi;
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template <typename Iterator>
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transform_expression_grammar<Iterator>::transform_expression_grammar()
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: transform_expression_grammar::base_type(start)
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{
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using boost::phoenix::construct;
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qi::_1_type _1;
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qi::_4_type _4;
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qi::_2_type _2;
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qi::_5_type _5;
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qi::_3_type _3;
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qi::_6_type _6;
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qi::_val_type _val;
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qi::char_type char_;
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qi::double_type double_;
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qi::lit_type lit;
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qi::no_case_type no_case;
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// [http://www.w3.org/TR/SVG/coords.html#TransformAttribute]
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// The value of the ‘transform’ attribute is a <transform-list>, which
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// is defined as a list of transform definitions, which are applied in
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// the order provided. The individual transform definitions are
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// separated by whitespace and/or a comma.
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qi::no_skip_type no_skip;
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start = transform_ % no_skip[char_(", ")] ;
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transform_ = matrix | translate | scale | rotate | skewX | skewY ;
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// matrix(<a> <b> <c> <d> <e> <f>)
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matrix = no_case[lit("matrix")]
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>> (lit('(')
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>> ( atom >> sep_atom >> sep_atom >> sep_atom >> sep_atom
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>> sep_atom >> lit(')')
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| expr >> sep_expr >> sep_expr >> sep_expr >> sep_expr
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>> sep_expr >> lit(')')
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))
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[ _val = construct<matrix_node>(_1,_2,_3,_4,_5,_6) ];
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// translate(<tx> [<ty>])
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translate = no_case[lit("translate")]
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>> lit('(')
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>> ( ( atom >> -sep_atom >> lit(')') )
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[ _val = construct<translate_node>(_1,_2) ]
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| ( expr >> -sep_expr >> lit(')') )
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[ _val = construct<translate_node>(_1,_2) ]
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);
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// scale(<sx> [<sy>])
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scale = no_case[lit("scale")]
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>> lit('(')
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>> ( ( atom >> -sep_atom >> lit(')') )
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[ _val = construct<scale_node>(_1,_2) ]
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| ( expr >> -sep_expr >> lit(')') )
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[ _val = construct<scale_node>(_1,_2) ]
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);
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// rotate(<rotate-angle> [<cx> <cy>])
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rotate = no_case[lit("rotate")]
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>> lit('(')
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>> ( ( atom >> -( sep_atom >> sep_atom ) >> lit(')') )
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[ _val = construct<rotate_node>(_1,_2) ]
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| ( expr >> -( sep_expr >> sep_expr ) >> lit(')') )
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[ _val = construct<rotate_node>(_1,_2) ]
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);
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// skewX(<skew-angle>)
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skewX = no_case[lit("skewX")]
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>> lit('(')
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>> expr [ _val = construct<skewX_node>(_1) ]
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>> lit(')');
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// skewY(<skew-angle>)
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skewY = no_case[lit("skewY")]
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>> lit('(')
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>> expr [ _val = construct<skewY_node>(_1) ]
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>> lit(')');
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// number or attribute
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atom = double_ [ _val = _1 ]
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| attr [ _val = construct<mapnik::attribute>(_1) ];
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// Individual arguments in lists consiting solely of numbers and/or
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// attributes are separated by whitespace and/or a comma.
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sep_atom = -lit(',') >> atom [ _val = _1 ];
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// Individual arguments in lists containing one or more compound
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// expressions are separated by a comma.
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sep_expr = lit(',') >> expr [ _val = _1 ];
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attr = g_.attr.alias();
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expr = g_.expr.alias();
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}
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template struct mapnik::transform_expression_grammar<std::string::const_iterator>;
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}
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