1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
// Copyright (c) 2015-2017 Dr. Colin Hirsch and Daniel Frey
// Please see LICENSE for license or visit https://github.com/taocpp/PEGTL/
#ifndef TAOCPP_PEGTL_INCLUDE_CONTRIB_CHANGES_HPP
#define TAOCPP_PEGTL_INCLUDE_CONTRIB_CHANGES_HPP
#include <type_traits>
#include "../config.hpp"
#include "../normal.hpp"
namespace tao
{
namespace TAOCPP_PEGTL_NAMESPACE
{
namespace internal
{
struct dummy_disabled_state
{
template< typename... Ts >
void success( Ts&&... ) const noexcept
{
}
};
template< apply_mode A, typename State >
using state_disable_helper = typename std::conditional< A == apply_mode::ACTION, State, dummy_disabled_state >::type;
} // namespace internal
template< typename Rule, typename State, template< typename... > class Base = normal >
struct change_state
: public Base< Rule >
{
template< apply_mode A,
rewind_mode M,
template< typename... > class Action,
template< typename... > class Control,
typename Input,
typename... States >
static bool match( Input& in, States&&... st )
{
internal::state_disable_helper< A, State > s;
if( Base< Rule >::template match< A, M, Action, Control >( in, s ) ) {
s.success( st... );
return true;
}
return false;
}
};
template< typename Rule, template< typename... > class Action, template< typename... > class Base = normal >
struct change_action
: public Base< Rule >
{
template< apply_mode A,
rewind_mode M,
template< typename... > class,
template< typename... > class Control,
typename Input,
typename... States >
static bool match( Input& in, States&&... st )
{
return Base< Rule >::template match< A, M, Action, Control >( in, st... );
}
};
template< template< typename... > class Action, template< typename... > class Base >
struct change_both_helper
{
template< typename T >
using change_action = change_action< T, Action, Base >;
};
template< typename Rule, typename State, template< typename... > class Action, template< typename... > class Base = normal >
struct change_state_and_action
: public change_state< Rule, State, change_both_helper< Action, Base >::template change_action >
{
};
} // namespace TAOCPP_PEGTL_NAMESPACE
} // namespace tao
#endif
|
