256 lines
7.8 KiB
C++
256 lines
7.8 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) 2011 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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#ifndef MAPNIK_EXPRESSIONS_GRAMMAR_HPP
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#define MAPNIK_EXPRESSIONS_GRAMMAR_HPP
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// mapnik
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#include <mapnik/value.hpp>
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#include <mapnik/expression_node.hpp>
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// boost
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#include <boost/version.hpp>
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#include <boost/variant.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/concept_check.hpp>
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// spirit2
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#include <boost/spirit/include/qi.hpp>
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#include <boost/spirit/include/qi_action.hpp>
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// fusion
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#include <boost/fusion/include/adapt_struct.hpp>
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// phoenix
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#include <boost/spirit/include/phoenix_core.hpp>
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#include <boost/spirit/include/phoenix_object.hpp>
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#include <boost/spirit/include/phoenix_operator.hpp>
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#include <boost/spirit/include/phoenix_function.hpp>
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#include <boost/spirit/include/phoenix_stl.hpp>
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#include <boost/spirit/home/phoenix/object/construct.hpp>
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namespace mapnik
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{
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using namespace boost;
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namespace qi = boost::spirit::qi;
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namespace standard_wide = boost::spirit::standard_wide;
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using standard_wide::space_type;
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struct unicode_impl
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{
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template <typename T>
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struct result
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{
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typedef UnicodeString type;
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};
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explicit unicode_impl(mapnik::transcoder const& tr)
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: tr_(tr) {}
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UnicodeString operator()(std::string const& str) const
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{
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return tr_.transcode(str.c_str());
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}
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mapnik::transcoder const& tr_;
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};
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struct regex_match_impl
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{
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template <typename T0, typename T1>
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struct result
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{
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typedef expr_node type;
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};
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explicit regex_match_impl(mapnik::transcoder const& tr)
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: tr_(tr) {}
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template <typename T0,typename T1>
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expr_node operator() (T0 & node, T1 const& pattern) const
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{
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#if defined(BOOST_REGEX_HAS_ICU)
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return regex_match_node(node,tr_.transcode(pattern.c_str()));
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#else
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return regex_match_node(node,pattern);
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#endif
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}
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mapnik::transcoder const& tr_;
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};
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struct regex_replace_impl
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{
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template <typename T0, typename T1, typename T2>
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struct result
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{
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typedef expr_node type;
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};
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explicit regex_replace_impl(mapnik::transcoder const& tr)
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: tr_(tr) {}
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template <typename T0,typename T1,typename T2>
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expr_node operator() (T0 & node, T1 const& pattern, T2 const& format) const
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{
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#if defined(BOOST_REGEX_HAS_ICU)
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return regex_replace_node(node,tr_.transcode(pattern.c_str()),tr_.transcode(format.c_str()));
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#else
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return regex_replace_node(node,pattern,format);
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#endif
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}
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mapnik::transcoder const& tr_;
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};
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template <typename Iterator>
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struct expression_grammar : qi::grammar<Iterator, expr_node(), space_type>
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{
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typedef qi::rule<Iterator, expr_node(), space_type> rule_type;
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explicit expression_grammar(mapnik::transcoder const& tr)
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: expression_grammar::base_type(expr),
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unicode_(unicode_impl(tr)),
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regex_match_(regex_match_impl(tr)),
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regex_replace_(regex_replace_impl(tr))
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{
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using boost::phoenix::construct;
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using qi::_1;
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using qi::_a;
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using qi::_b;
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using qi::_r1;
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#if BOOST_VERSION > 104200
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using qi::no_skip;
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#else
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using qi::lexeme;
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#endif
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using qi::_val;
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using qi::lit;
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using qi::int_;
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using qi::double_;
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using standard_wide::char_;
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expr = logical_expr.alias();
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logical_expr = not_expr [_val = _1]
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>>
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*( ( ( lit("and") | lit("&&")) >> not_expr [_val && _1] )
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| (( lit("or") | lit("||")) >> not_expr [_val || _1])
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)
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;
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not_expr =
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cond_expr [_val = _1 ]
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| ((lit("not") | lit('!')) >> cond_expr [ _val = !_1 ])
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;
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cond_expr = equality_expr [_val = _1] | additive_expr [_val = _1]
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;
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equality_expr =
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relational_expr [_val = _1]
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>> *( ( (lit("=") | lit("eq") | lit("is")) >> relational_expr [_val == _1])
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| (( lit("!=") | lit("<>") | lit("neq") ) >> relational_expr [_val != _1])
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)
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;
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regex_match_expr = lit(".match")
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>> lit('(')
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>> ustring [_val = _1]
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>> lit(')')
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;
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regex_replace_expr =
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lit(".replace")
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>> lit('(')
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>> ustring [_a = _1]
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>> lit(',')
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>> ustring [_b = _1]
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>> lit(')') [_val = regex_replace_(_r1,_a,_b)]
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;
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relational_expr = additive_expr[_val = _1]
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>>
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*( ( (lit("<=") | lit("le") ) >> additive_expr [ _val <= _1 ])
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| ( (lit('<') | lit("lt") ) >> additive_expr [ _val < _1 ])
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| ( (lit(">=") | lit("ge") ) >> additive_expr [ _val >= _1 ])
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| ( (lit('>') | lit("gt") ) >> additive_expr [ _val > _1 ])
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)
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;
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additive_expr = multiplicative_expr [_val = _1]
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>> * ( '+' >> multiplicative_expr[_val += _1]
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| '-' >> multiplicative_expr[_val -= _1]
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)
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;
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multiplicative_expr = primary_expr [_val = _1]
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>> *( '*' >> primary_expr [_val *= _1]
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| '/' >> primary_expr [_val /= _1]
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| '%' >> primary_expr [_val %= _1]
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| regex_match_expr[_val = regex_match_(_val, _1)]
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| regex_replace_expr(_val) [_val = _1]
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)
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;
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primary_expr = strict_double [_val = _1]
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| int_ [_val = _1]
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| lit("true") [_val = true]
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| lit("false") [_val = false]
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| lit("null") [_val = value_null() ]
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| ustring [_val = unicode_(_1) ]
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| attr [_val = construct<mapnik::attribute>( _1 ) ]
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| '(' >> expr [_val = _1 ] >> ')'
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;
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attr %= '[' >> +(char_ - ']') >> ']';
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#if BOOST_VERSION > 104200
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ustring %= '\'' >> no_skip[*~char_('\'')] >> '\'';
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#else
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ustring %= '\'' >> lexeme[*(char_-'\'')] >> '\'';
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#endif
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}
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qi::real_parser<double, qi::strict_real_policies<double> > strict_double;
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boost::phoenix::function<unicode_impl> unicode_;
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boost::phoenix::function<regex_match_impl> regex_match_;
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boost::phoenix::function<regex_replace_impl> regex_replace_;
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//
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rule_type expr;
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rule_type equality_expr;
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rule_type cond_expr;
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rule_type relational_expr;
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rule_type logical_expr;
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rule_type additive_expr;
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rule_type multiplicative_expr;
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rule_type not_expr;
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rule_type primary_expr;
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qi::rule<Iterator, std::string() > regex_match_expr;
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qi::rule<Iterator, expr_node(expr_node), qi::locals<std::string,std::string>, space_type> regex_replace_expr;
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qi::rule<Iterator, std::string() , space_type> attr;
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qi::rule<Iterator, std::string() > ustring;
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};
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} // namespace
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#endif // MAPNIK_EXPRESSIONS_GRAMMAR_HPP
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