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path_expression_grammer - implement parser using boost::spirit::x3

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This commit is contained in:
artemp 2016-08-25 18:00:14 +01:00
parent b4dda3c180
commit ca88e55264
6 changed files with 91 additions and 101 deletions
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5
include/mapnik/expression_grammar_x3_config.hpp
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@ -27,11 +27,6 @@
#include <mapnik/unicode.hpp>
#include <string>
#pragma GCC diagnostic push
#include <mapnik/warning_ignore.hpp>
#include <boost/spirit/home/x3.hpp>
#pragma GCC diagnostic pop
namespace mapnik { namespace grammar {
namespace x3 = boost::spirit::x3;

2
include/mapnik/expression_grammar_x3_def.hpp
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@ -2,7 +2,7 @@
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 Artem Pavlenko
* Copyright (C) 2016 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public

62
include/mapnik/path_expression_grammar_impl.hpp
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@ -1,62 +0,0 @@
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 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/path_expression_grammar.hpp>
#include <mapnik/attribute.hpp>
#pragma GCC diagnostic push
#include <mapnik/warning_ignore.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/spirit/include/phoenix_object.hpp>
#include <boost/spirit/include/phoenix_stl.hpp>
#pragma GCC diagnostic pop
namespace mapnik
{
template <typename Iterator>
path_expression_grammar<Iterator>::path_expression_grammar()
: path_expression_grammar::base_type(expr)
{
standard_wide::char_type char_;
qi::_1_type _1;
qi::_val_type _val;
qi::lit_type lit;
qi::lexeme_type lexeme;
using phoenix::push_back;
using boost::phoenix::construct;
expr =
* (
str [ push_back(_val, _1)]
|
( '[' >> attr [ push_back(_val, construct<mapnik::attribute>( _1 )) ] >> ']')
)
;
attr %= +(char_ - ']');
str %= lexeme[+(char_ -'[')];
}
}

37
include/mapnik/path_expression_grammar.hpp → include/mapnik/path_expression_grammar_x3.hpp
View file

@ -2,7 +2,7 @@
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 Artem Pavlenko
* Copyright (C) 2016 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -20,40 +20,25 @@
*
*****************************************************************************/
#ifndef MAPNIK_PATH_EXPRESSIONS_GRAMMAR_HPP
#define MAPNIK_PATH_EXPRESSIONS_GRAMMAR_HPP
#ifndef MAPNIK_PATH_EXPRESSIONS_GRAMMAR_X3_HPP
#define MAPNIK_PATH_EXPRESSIONS_GRAMMAR_X3_HPP
// mapnik
#include <mapnik/path_expression.hpp>
#pragma GCC diagnostic push
#include <mapnik/warning_ignore.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/home/x3.hpp>
#pragma GCC diagnostic pop
// stl
#include <string>
#include <vector>
namespace mapnik { namespace grammar {
namespace mapnik
{
namespace x3 = boost::spirit::x3;
struct path_expression_class; // top-most ID
using path_expression_grammar_type = x3::rule<path_expression_class, path_expression>;
using namespace boost;
namespace qi = boost::spirit::qi;
namespace phoenix = boost::phoenix;
namespace standard_wide = boost::spirit::standard_wide;
BOOST_SPIRIT_DECLARE(path_expression_grammar_type);
using standard_wide::space_type;
}}
template <typename Iterator>
struct path_expression_grammar : qi::grammar<Iterator, std::vector<path_component>(), space_type>
{
path_expression_grammar();
qi::rule<Iterator, std::vector<path_component>() , space_type> expr;
qi::rule<Iterator, std::string() , space_type> attr;
qi::rule<Iterator, std::string() > str;
};
}
#endif // MAPNIK_PATH_EXPRESSIONS_GRAMMAR_HPP
#endif // MAPNIK_PATH_EXPRESSIONS_GRAMMAR_X3_HPP

63
include/mapnik/path_expression_grammar_x3_def.hpp Normal file
View file

@ -0,0 +1,63 @@
/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2016 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_PATH_EXPRESSIONS_GRAMMAR_X3_DEF_HPP
#define MAPNIK_PATH_EXPRESSIONS_GRAMMAR_X3_DEF_HPP
// mapnik
#include <mapnik/path_expression_grammar_x3.hpp>
#include <mapnik/attribute.hpp>
namespace mapnik { namespace grammar {
namespace x3 = boost::spirit::x3;
using x3::standard_wide::char_;
using x3::lexeme;
auto create_string = [](auto & ctx) { _val(ctx).push_back(_attr(ctx)); };
auto create_attribute = [](auto & ctx) { _val(ctx).push_back(mapnik::attribute(_attr(ctx))); };
// top-most rule
path_expression_grammar_type const path_expression("path_expression");
// rules
x3::rule<class attr_expression, std::string> const attr_expression("attribute");
x3::rule<class str_expression, std::string> const str_expression("string");
auto const attr_expression_def = +(char_ - ']');
auto const str_expression_def = lexeme[+(char_ -'[')];
auto const path_expression_def = *(str_expression[create_string] | '[' > attr_expression[create_attribute] > ']');
BOOST_SPIRIT_DEFINE(
path_expression,
attr_expression,
str_expression
);
}}
namespace mapnik {
grammar::path_expression_grammar_type path_expression_grammar()
{
return grammar::path_expression;
}
}
#endif //MAPNIK_PATH_EXPRESSIONS_GRAMMAR_X3_DEF_HPP

21
src/parse_path.cpp
View file

@ -21,26 +21,35 @@
*****************************************************************************/
#include <mapnik/parse_path.hpp>
#include <mapnik/path_expression_grammar.hpp>
#include <mapnik/path_expression_grammar_impl.hpp>
#include <mapnik/config.hpp>
#include <mapnik/attribute.hpp>
#include <mapnik/feature.hpp>
#include <mapnik/value.hpp>
#include <mapnik/path_expression_grammar_x3.hpp>
#include <mapnik/path_expression_grammar_x3_def.hpp>
// stl
#include <stdexcept>
namespace mapnik {
namespace mapnik { namespace grammar {
namespace x3 = boost::spirit::x3;
using iterator_type = std::string::const_iterator;
using context_type = x3::phrase_parse_context<x3::standard_wide::space_type>::type;
BOOST_SPIRIT_INSTANTIATE(path_expression_grammar_type, iterator_type, context_type);
}
path_expression_ptr parse_path(std::string const& str)
{
static const path_expression_grammar<std::string::const_iterator> g;
namespace x3 = boost::spirit::x3;
auto path = std::make_shared<path_expression>();
boost::spirit::standard_wide::space_type space;
using boost::spirit::x3::standard_wide::space;
std::string::const_iterator itr = str.begin();
std::string::const_iterator end = str.end();
bool r = qi::phrase_parse(itr, end, g, space, *path);
bool r = x3::phrase_parse(itr, end, path_expression_grammar(), space, *path);
if (r && itr == end)
{
return path;