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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_EXPECT_FUNCTION_APR_29_2007_0558PM) | |
8 | #define SPIRIT_EXPECT_FUNCTION_APR_29_2007_0558PM | |
9 | ||
10 | #if defined(_MSC_VER) | |
11 | #pragma once | |
12 | #endif | |
13 | ||
14 | #include <boost/spirit/home/support/unused.hpp> | |
15 | #include <boost/spirit/home/support/multi_pass_wrapper.hpp> | |
16 | #include <boost/throw_exception.hpp> | |
17 | ||
18 | namespace boost { namespace spirit { namespace qi { namespace detail | |
19 | { | |
20 | template < | |
21 | typename Iterator, typename Context | |
22 | , typename Skipper, typename Exception> | |
23 | struct expect_function | |
24 | { | |
25 | typedef Iterator iterator_type; | |
26 | typedef Context context_type; | |
27 | ||
28 | expect_function( | |
29 | Iterator& first_, Iterator const& last_ | |
30 | , Context& context_, Skipper const& skipper_) | |
31 | : first(first_) | |
32 | , last(last_) | |
33 | , context(context_) | |
34 | , skipper(skipper_) | |
35 | , is_first(true) | |
36 | { | |
37 | } | |
38 | ||
39 | template <typename Component, typename Attribute> | |
40 | bool operator()(Component const& component, Attribute& attr) const | |
41 | { | |
42 | // if this is not the first component in the expect chain we | |
43 | // need to flush any multi_pass iterator we might be acting on | |
44 | if (!is_first) | |
45 | spirit::traits::clear_queue(first); | |
46 | ||
47 | // if we are testing the first component in the sequence, | |
48 | // return true if the parser fails, if this is not the first | |
49 | // component, throw exception if the parser fails | |
50 | if (!component.parse(first, last, context, skipper, attr)) | |
51 | { | |
52 | if (is_first) | |
53 | { | |
54 | is_first = false; | |
55 | return true; // true means the match failed | |
56 | } | |
57 | boost::throw_exception(Exception(first, last, component.what(context))); | |
58 | #if defined(BOOST_NO_EXCEPTIONS) | |
59 | return true; // for systems not supporting exceptions | |
60 | #endif | |
61 | } | |
62 | is_first = false; | |
63 | return false; | |
64 | } | |
65 | ||
66 | template <typename Component> | |
67 | bool operator()(Component const& component) const | |
68 | { | |
69 | // if this is not the first component in the expect chain we | |
70 | // need to flush any multi_pass iterator we might be acting on | |
71 | if (!is_first) | |
72 | spirit::traits::clear_queue(first); | |
73 | ||
74 | // if we are testing the first component in the sequence, | |
75 | // return true if the parser fails, if this not the first | |
76 | // component, throw exception if the parser fails | |
77 | if (!component.parse(first, last, context, skipper, unused)) | |
78 | { | |
79 | if (is_first) | |
80 | { | |
81 | is_first = false; | |
82 | return true; | |
83 | } | |
84 | boost::throw_exception(Exception(first, last, component.what(context))); | |
85 | #if defined(BOOST_NO_EXCEPTIONS) | |
86 | return false; // for systems not supporting exceptions | |
87 | #endif | |
88 | } | |
89 | is_first = false; | |
90 | return false; | |
91 | } | |
92 | ||
93 | Iterator& first; | |
94 | Iterator const& last; | |
95 | Context& context; | |
96 | Skipper const& skipper; | |
97 | mutable bool is_first; | |
98 | ||
99 | private: | |
100 | // silence MSVC warning C4512: assignment operator could not be generated | |
101 | expect_function& operator= (expect_function const&); | |
102 | }; | |
103 | }}}} | |
104 | ||
105 | #endif |