1 /*=============================================================================
2     Copyright (c) 2003 Vaclav Vesely
3     http://spirit.sourceforge.net/
4 
5     Use, modification and distribution is subject to the Boost Software
6     License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
7     http://www.boost.org/LICENSE_1_0.txt)
8 =============================================================================*/
9 #include <boost/assert.hpp>
10 #include <iostream>
11 #include <boost/cstdlib.hpp>
12 #include <boost/spirit/include/classic_core.hpp>
13 #include <boost/spirit/include/classic_distinct.hpp>
14 
15 using namespace std;
16 using namespace boost;
17 using namespace BOOST_SPIRIT_CLASSIC_NS;
18 
19 struct my_grammar: public grammar<my_grammar>
20 {
21     template <typename ScannerT>
22     struct definition
23     {
24         typedef rule<ScannerT> rule_t;
25 
26         // keyword_p for ASN.1
27         dynamic_distinct_parser<ScannerT> keyword_p;
28 
definitionmy_grammar::definition29         definition(my_grammar const& self)
30         :   keyword_p(alnum_p | ('-' >> ~ch_p('-'))) // ASN.1 has quite complex naming rules
31         {
32             top
33                 =
34                     keyword_p("asn-declare") // use keyword_p instead of std_p
35                 >>  !str_p("--")
36                 >>  keyword_p("ident")
37                 ;
38         }
39 
40         rule_t top;
41 
startmy_grammar::definition42         rule_t const& start() const
43         {
44             return top;
45         }
46     };
47 };
48 
main()49 int main()
50 {
51     my_grammar gram;
52     parse_info<> info;
53 
54     info = parse("asn-declare ident", gram, space_p);
55     BOOST_ASSERT(info.full); // valid input
56 
57     info = parse("asn-declare--ident", gram, space_p);
58     BOOST_ASSERT(info.full); // valid input
59 
60     info = parse("asn-declare-ident", gram, space_p);
61     BOOST_ASSERT(!info.hit); // invalid input
62 
63     return exit_success;
64 }
65