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20effc67 | 1 | // Copyright (c) 2009-2020 Vladimir Batov. |
7c673cae FG |
2 | // Use, modification and distribution are subject to the Boost Software License, |
3 | // Version 1.0. See http://www.boost.org/LICENSE_1_0.txt. | |
4 | ||
5 | #ifndef BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP | |
6 | #define BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP | |
7 | ||
8 | #include <boost/convert/base.hpp> | |
b32b8144 | 9 | #include <boost/convert/detail/config.hpp> |
7c673cae FG |
10 | #include <boost/spirit/include/qi.hpp> |
11 | #include <boost/spirit/include/karma.hpp> | |
12 | ||
13 | namespace boost { namespace cnv | |
14 | { | |
15 | struct spirit; | |
16 | }} | |
17 | ||
18 | struct boost::cnv::spirit : public boost::cnv::cnvbase<boost::cnv::spirit> | |
19 | { | |
20 | typedef boost::cnv::spirit this_type; | |
21 | typedef boost::cnv::cnvbase<this_type> base_type; | |
22 | ||
23 | using base_type::operator(); | |
24 | ||
25 | template<typename string_type, typename out_type> | |
26 | void | |
27 | str_to(cnv::range<string_type> range, optional<out_type>& result_out) const | |
28 | { | |
29 | typedef typename cnv::range<string_type>::iterator iterator; | |
30 | typedef typename boost::spirit::traits::create_parser<out_type>::type parser; | |
31 | ||
32 | iterator beg = range.begin(); | |
33 | iterator end = range.end(); | |
34 | out_type result; | |
35 | ||
36 | if (boost::spirit::qi::parse(beg, end, parser(), result)) | |
37 | if (beg == end) // ensure the whole string has been parsed | |
38 | result_out = result; | |
39 | } | |
40 | template<typename in_type, typename char_type> | |
41 | cnv::range<char_type*> | |
42 | to_str(in_type value_in, char_type* beg) const | |
43 | { | |
44 | typedef typename boost::spirit::traits::create_generator<in_type>::type generator; | |
45 | ||
46 | char_type* end = beg; | |
47 | bool good = boost::spirit::karma::generate(end, generator(), value_in); | |
48 | ||
49 | return cnv::range<char_type*>(beg, good ? end : beg); | |
50 | } | |
51 | }; | |
52 | ||
53 | #endif // BOOST_CONVERT_SPIRIT_BASED_CONVERTER_HPP | |
54 |