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1 | // Copyright (c) 2001-2011 Hartmut Kaiser |
2 | // | |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | #if !defined(BOOST_SPIRIT_ITERATOR_SPLIT_FUNCTOR_INPUT_POLICY_JAN_16_2008_0448M) | |
7 | #define BOOST_SPIRIT_ITERATOR_SPLIT_FUNCTOR_INPUT_POLICY_JAN_16_2008_0448M | |
8 | ||
9 | #include <boost/spirit/home/support/iterators/multi_pass_fwd.hpp> | |
10 | #include <boost/spirit/home/support/iterators/detail/multi_pass.hpp> | |
11 | #include <boost/assert.hpp> | |
12 | ||
13 | namespace boost { namespace spirit { namespace iterator_policies | |
14 | { | |
15 | namespace is_valid_test_ | |
16 | { | |
17 | template <typename Token> | |
18 | inline bool token_is_valid(Token const&) | |
19 | { | |
20 | return true; | |
21 | } | |
22 | } | |
23 | ||
24 | /////////////////////////////////////////////////////////////////////////// | |
25 | // class functor_input | |
26 | // Implementation of the InputPolicy used by multi_pass | |
27 | // functor_input gets tokens from a functor | |
28 | // | |
29 | // Note: the functor must have a typedef for result_type | |
30 | // It also must have a static variable of type result_type defined | |
31 | // to represent EOF that is called eof. | |
32 | // | |
33 | /////////////////////////////////////////////////////////////////////////// | |
34 | struct functor_input | |
35 | { | |
36 | /////////////////////////////////////////////////////////////////////// | |
37 | template <typename Functor> | |
38 | class unique : public detail::default_input_policy | |
39 | { | |
40 | private: | |
41 | typedef typename Functor::result_type result_type; | |
42 | ||
43 | protected: | |
44 | unique() {} | |
45 | explicit unique(Functor const& x) : ftor(x) {} | |
46 | ||
47 | void swap(unique& x) | |
48 | { | |
49 | boost::swap(ftor, x.ftor); | |
50 | } | |
51 | ||
52 | public: | |
53 | typedef result_type value_type; | |
54 | typedef std::ptrdiff_t difference_type; | |
55 | typedef std::ptrdiff_t distance_type; | |
56 | typedef result_type* pointer; | |
57 | typedef result_type& reference; | |
58 | ||
59 | public: | |
60 | // get the next token | |
61 | template <typename MultiPass> | |
62 | static typename MultiPass::reference get_input(MultiPass& mp) | |
63 | { | |
64 | value_type& curtok = mp.shared()->curtok; | |
65 | if (!input_is_valid(mp, curtok)) | |
66 | curtok = mp.ftor(); | |
67 | return curtok; | |
68 | } | |
69 | ||
70 | template <typename MultiPass> | |
71 | static void advance_input(MultiPass& mp) | |
72 | { | |
73 | // if mp.shared is NULL then this instance of the multi_pass | |
74 | // represents a end iterator | |
75 | BOOST_ASSERT(0 != mp.shared()); | |
76 | mp.shared()->curtok = mp.ftor(); | |
77 | } | |
78 | ||
79 | // test, whether we reached the end of the underlying stream | |
80 | template <typename MultiPass> | |
81 | static bool input_at_eof(MultiPass const& mp) | |
82 | { | |
83 | return mp.shared()->curtok == mp.ftor.eof; | |
84 | } | |
85 | ||
86 | template <typename MultiPass> | |
87 | static bool input_is_valid(MultiPass const&, value_type const& t) | |
88 | { | |
89 | using namespace is_valid_test_; | |
90 | return token_is_valid(t); | |
91 | } | |
92 | ||
93 | Functor& get_functor() const | |
94 | { | |
95 | return ftor; | |
96 | } | |
97 | ||
98 | protected: | |
99 | mutable Functor ftor; | |
100 | }; | |
101 | ||
102 | /////////////////////////////////////////////////////////////////////// | |
103 | template <typename Functor> | |
104 | struct shared | |
105 | { | |
106 | explicit shared(Functor const&) : curtok(0) {} | |
107 | ||
108 | typename Functor::result_type curtok; | |
109 | }; | |
110 | }; | |
111 | ||
112 | }}} | |
113 | ||
114 | #endif |