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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
3 | ||
4 | Distributed under the Boost Software License, Version 1.0. (See accompanying | |
5 | file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | =============================================================================*/ | |
7 | #if !defined(SPIRIT_PERMUTE_FUNCTION_MARCH_13_2007_1129AM) | |
8 | #define SPIRIT_PERMUTE_FUNCTION_MARCH_13_2007_1129AM | |
9 | ||
10 | #if defined(_MSC_VER) | |
11 | #pragma once | |
12 | #endif | |
13 | ||
14 | #include <boost/spirit/home/support/unused.hpp> | |
15 | #include <boost/optional.hpp> | |
16 | ||
17 | namespace boost { namespace spirit { namespace qi { namespace detail | |
18 | { | |
19 | template <typename Iterator, typename Context, typename Skipper> | |
20 | struct permute_function | |
21 | { | |
22 | permute_function( | |
23 | Iterator& first_, Iterator const& last_ | |
24 | , Context& context_, Skipper const& skipper_) | |
25 | : first(first_) | |
26 | , last(last_) | |
27 | , context(context_) | |
28 | , skipper(skipper_) | |
29 | { | |
30 | } | |
31 | ||
32 | template <typename Component, typename Attribute> | |
33 | bool operator()(Component const& component, Attribute& attr) | |
34 | { | |
35 | // return true if the parser succeeds and the slot is not yet taken | |
36 | if (!*taken && component.parse(first, last, context, skipper, attr)) | |
37 | { | |
38 | *taken = true; | |
39 | ++taken; | |
40 | return true; | |
41 | } | |
42 | ++taken; | |
43 | return false; | |
44 | } | |
45 | ||
46 | template <typename Component, typename Attribute> | |
47 | bool operator()(Component const& component, boost::optional<Attribute>& attr) | |
48 | { | |
49 | // return true if the parser succeeds and the slot is not yet taken | |
50 | Attribute val; | |
51 | if (!*taken && component.parse(first, last, context, skipper, val)) | |
52 | { | |
53 | attr = val; | |
54 | *taken = true; | |
55 | ++taken; | |
56 | return true; | |
57 | } | |
58 | ++taken; | |
59 | return false; | |
60 | } | |
61 | ||
62 | template <typename Component> | |
63 | bool operator()(Component const& component) | |
64 | { | |
65 | // return true if the parser succeeds and the slot is not yet taken | |
66 | if (!*taken && component.parse(first, last, context, skipper, unused)) | |
67 | { | |
68 | *taken = true; | |
69 | ++taken; | |
70 | return true; | |
71 | } | |
72 | ++taken; | |
73 | return false; | |
74 | } | |
75 | ||
76 | Iterator& first; | |
77 | Iterator const& last; | |
78 | Context& context; | |
79 | Skipper const& skipper; | |
80 | bool* taken; | |
81 | ||
82 | private: | |
83 | // silence MSVC warning C4512: assignment operator could not be generated | |
84 | permute_function& operator= (permute_function const&); | |
85 | }; | |
86 | }}}} | |
87 | ||
88 | #endif |