/
expression_grammar.hpp
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/
expression_grammar.hpp
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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
*
*****************************************************************************/
#ifndef MAPNIK_EXPRESSIONS_GRAMMAR_HPP
#define MAPNIK_EXPRESSIONS_GRAMMAR_HPP
// mapnik
#include <mapnik/value.hpp>
#include <mapnik/expression_node.hpp>
// boost
#include <boost/version.hpp>
#include <boost/variant.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/concept_check.hpp>
// spirit2
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/qi_action.hpp>
// fusion
#include <boost/fusion/include/adapt_struct.hpp>
// phoenix
#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/spirit/include/phoenix_object.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_function.hpp>
#include <boost/spirit/include/phoenix_stl.hpp>
#include <boost/spirit/home/phoenix/object/construct.hpp>
namespace mapnik
{
using namespace boost;
namespace qi = boost::spirit::qi;
namespace standard_wide = boost::spirit::standard_wide;
using standard_wide::space_type;
struct unicode_impl
{
template <typename T>
struct result
{
typedef UnicodeString type;
};
explicit unicode_impl(mapnik::transcoder const& tr)
: tr_(tr) {}
UnicodeString operator()(std::string const& str) const
{
return tr_.transcode(str.c_str());
}
mapnik::transcoder const& tr_;
};
struct regex_match_impl
{
template <typename T0, typename T1>
struct result
{
typedef expr_node type;
};
explicit regex_match_impl(mapnik::transcoder const& tr)
: tr_(tr) {}
template <typename T0,typename T1>
expr_node operator() (T0 & node, T1 const& pattern) const
{
#if defined(BOOST_REGEX_HAS_ICU)
return regex_match_node(node,tr_.transcode(pattern.c_str()));
#else
return regex_match_node(node,pattern);
#endif
}
mapnik::transcoder const& tr_;
};
struct regex_replace_impl
{
template <typename T0, typename T1, typename T2>
struct result
{
typedef expr_node type;
};
explicit regex_replace_impl(mapnik::transcoder const& tr)
: tr_(tr) {}
template <typename T0,typename T1,typename T2>
expr_node operator() (T0 & node, T1 const& pattern, T2 const& format) const
{
#if defined(BOOST_REGEX_HAS_ICU)
return regex_replace_node(node,tr_.transcode(pattern.c_str()),tr_.transcode(format.c_str()));
#else
return regex_replace_node(node,pattern,format);
#endif
}
mapnik::transcoder const& tr_;
};
template <typename Iterator>
struct expression_grammar : qi::grammar<Iterator, expr_node(), space_type>
{
typedef qi::rule<Iterator, expr_node(), space_type> rule_type;
explicit expression_grammar(mapnik::transcoder const& tr)
: expression_grammar::base_type(expr),
unicode_(unicode_impl(tr)),
regex_match_(regex_match_impl(tr)),
regex_replace_(regex_replace_impl(tr))
{
using boost::phoenix::construct;
using qi::_1;
using qi::_a;
using qi::_b;
using qi::_r1;
#if BOOST_VERSION > 104200
using qi::no_skip;
#else
using qi::lexeme;
#endif
using qi::_val;
using qi::lit;
using qi::int_;
using qi::double_;
using qi::hex;
using qi::omit;
using standard_wide::char_;
expr = logical_expr.alias();
logical_expr = not_expr [_val = _1]
>>
*( ( ( lit("and") | lit("&&")) >> not_expr [_val && _1] )
| (( lit("or") | lit("||")) >> not_expr [_val || _1])
)
;
not_expr =
cond_expr [_val = _1 ]
| ((lit("not") | lit('!')) >> cond_expr [ _val = !_1 ])
;
cond_expr = equality_expr [_val = _1] | additive_expr [_val = _1]
;
equality_expr =
relational_expr [_val = _1]
>> *( ( (lit("=") | lit("eq") | lit("is")) >> relational_expr [_val == _1])
| (( lit("!=") | lit("<>") | lit("neq") ) >> relational_expr [_val != _1])
)
;
regex_match_expr = lit(".match")
>> lit('(')
>> ustring [_val = _1]
>> lit(')')
;
regex_replace_expr =
lit(".replace")
>> lit('(')
>> ustring [_a = _1]
>> lit(',')
>> ustring [_b = _1]
>> lit(')') [_val = regex_replace_(_r1,_a,_b)]
;
relational_expr = additive_expr[_val = _1]
>>
*( ( (lit("<=") | lit("le") ) >> additive_expr [ _val <= _1 ])
| ( (lit('<') | lit("lt") ) >> additive_expr [ _val < _1 ])
| ( (lit(">=") | lit("ge") ) >> additive_expr [ _val >= _1 ])
| ( (lit('>') | lit("gt") ) >> additive_expr [ _val > _1 ])
)
;
additive_expr = multiplicative_expr [_val = _1]
>> * ( '+' >> multiplicative_expr[_val += _1]
| '-' >> multiplicative_expr[_val -= _1]
)
;
multiplicative_expr = primary_expr [_val = _1]
>> *( '*' >> primary_expr [_val *= _1]
| '/' >> primary_expr [_val /= _1]
| '%' >> primary_expr [_val %= _1]
| regex_match_expr[_val = regex_match_(_val, _1)]
| regex_replace_expr(_val) [_val = _1]
)
;
primary_expr = strict_double [_val = _1]
| int_ [_val = _1]
| lit("true") [_val = true]
| lit("false") [_val = false]
| lit("null") [_val = value_null() ]
| ustring [_val = unicode_(_1) ]
| attr [_val = construct<mapnik::attribute>( _1 ) ]
| '(' >> expr [_val = _1 ] >> ')'
;
unesc_char.add("\\a", '\a')("\\b", '\b')("\\f", '\f')("\\n", '\n')
("\\r", '\r')("\\t", '\t')("\\v", '\v')("\\\\", '\\')
("\\\'", '\'')("\\\"", '\"')
;
#if BOOST_VERSION > 104500
quote_char %= char_('\'') | char_('"');
ustring %= omit[quote_char[_a = _1]]
>> *(unesc_char | "\\x" >> hex | (char_ - lit(_a)))
>> lit(_a);
attr %= '[' >> no_skip[+~char_(']')] >> ']';
#else
ustring %= lit('\'')
>> *(unesc_char | "\\x" >> hex | (char_ - lit('\'')))
>> lit('\'');
attr %= '[' >> lexeme[+(char_ - ']')] >> ']';
#endif
}
qi::real_parser<double, qi::strict_real_policies<double> > strict_double;
boost::phoenix::function<unicode_impl> unicode_;
boost::phoenix::function<regex_match_impl> regex_match_;
boost::phoenix::function<regex_replace_impl> regex_replace_;
//
rule_type expr;
rule_type equality_expr;
rule_type cond_expr;
rule_type relational_expr;
rule_type logical_expr;
rule_type additive_expr;
rule_type multiplicative_expr;
rule_type not_expr;
rule_type primary_expr;
qi::rule<Iterator, std::string() > regex_match_expr;
qi::rule<Iterator, expr_node(expr_node), qi::locals<std::string,std::string>, space_type> regex_replace_expr;
qi::rule<Iterator, std::string() , space_type> attr;
qi::rule<Iterator, std::string(), qi::locals<char> > ustring;
qi::symbols<char const, char const> unesc_char;
qi::rule<Iterator, char() > quote_char;
};
} // namespace
#endif // MAPNIK_EXPRESSIONS_GRAMMAR_HPP