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
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
macro_rules! ast_struct {
(
[$($attrs_pub:tt)*]
struct $name:ident #full $($rest:tt)*
) => {
#[cfg(feature = "full")]
#[cfg_attr(feature = "extra-traits", derive(Debug, Eq, PartialEq, Hash))]
#[cfg_attr(feature = "clone-impls", derive(Clone))]
$($attrs_pub)* struct $name $($rest)*
#[cfg(not(feature = "full"))]
#[cfg_attr(feature = "extra-traits", derive(Debug, Eq, PartialEq, Hash))]
#[cfg_attr(feature = "clone-impls", derive(Clone))]
$($attrs_pub)* struct $name {
_noconstruct: (),
}
#[cfg(all(not(feature = "full"), feature = "printing"))]
impl ::quote::ToTokens for $name {
fn to_tokens(&self, _: &mut ::proc_macro2::TokenStream) {
unreachable!()
}
}
};
(
[$($attrs_pub:tt)*]
struct $name:ident #manual_extra_traits $($rest:tt)*
) => {
#[cfg_attr(feature = "extra-traits", derive(Debug))]
#[cfg_attr(feature = "clone-impls", derive(Clone))]
$($attrs_pub)* struct $name $($rest)*
};
(
[$($attrs_pub:tt)*]
struct $name:ident #manual_extra_traits_debug $($rest:tt)*
) => {
#[cfg_attr(feature = "clone-impls", derive(Clone))]
$($attrs_pub)* struct $name $($rest)*
};
(
[$($attrs_pub:tt)*]
struct $name:ident $($rest:tt)*
) => {
#[cfg_attr(feature = "extra-traits", derive(Debug, Eq, PartialEq, Hash))]
#[cfg_attr(feature = "clone-impls", derive(Clone))]
$($attrs_pub)* struct $name $($rest)*
};
($($t:tt)*) => {
strip_attrs_pub!(ast_struct!($($t)*));
};
}
macro_rules! ast_enum {
// Drop the `#no_visit` attribute, if present.
(
[$($attrs_pub:tt)*]
enum $name:ident #no_visit $($rest:tt)*
) => (
ast_enum!([$($attrs_pub)*] enum $name $($rest)*);
);
(
[$($attrs_pub:tt)*]
enum $name:ident #manual_extra_traits $($rest:tt)*
) => (
#[cfg_attr(feature = "extra-traits", derive(Debug))]
#[cfg_attr(feature = "clone-impls", derive(Clone))]
$($attrs_pub)* enum $name $($rest)*
);
(
[$($attrs_pub:tt)*]
enum $name:ident $($rest:tt)*
) => (
#[cfg_attr(feature = "extra-traits", derive(Debug, Eq, PartialEq, Hash))]
#[cfg_attr(feature = "clone-impls", derive(Clone))]
$($attrs_pub)* enum $name $($rest)*
);
($($t:tt)*) => {
strip_attrs_pub!(ast_enum!($($t)*));
};
}
macro_rules! ast_enum_of_structs {
(
$(#[$enum_attr:meta])*
$pub:ident $enum:ident $name:ident #$tag:ident $body:tt
$($remaining:tt)*
) => {
ast_enum!($(#[$enum_attr])* $pub $enum $name #$tag $body);
ast_enum_of_structs_impl!($pub $enum $name $body $($remaining)*);
};
(
$(#[$enum_attr:meta])*
$pub:ident $enum:ident $name:ident $body:tt
$($remaining:tt)*
) => {
ast_enum!($(#[$enum_attr])* $pub $enum $name $body);
ast_enum_of_structs_impl!($pub $enum $name $body $($remaining)*);
};
}
macro_rules! ast_enum_of_structs_impl {
(
$pub:ident $enum:ident $name:ident {
$(
$(#[$variant_attr:meta])*
$variant:ident $( ($member:ident) )*,
)*
}
$($remaining:tt)*
) => {
check_keyword_matches!(pub $pub);
check_keyword_matches!(enum $enum);
$($(
ast_enum_from_struct!($name::$variant, $member);
)*)*
#[cfg(feature = "printing")]
generate_to_tokens! {
$($remaining)*
()
tokens
$name { $($variant $($member)*,)* }
}
};
}
macro_rules! ast_enum_from_struct {
// No From<TokenStream> for verbatim variants.
($name:ident::Verbatim, $member:ident) => {};
($name:ident::$variant:ident, $member:ident) => {
impl From<$member> for $name {
fn from(e: $member) -> $name {
$name::$variant(e)
}
}
};
}
#[cfg(feature = "printing")]
macro_rules! generate_to_tokens {
(do_not_generate_to_tokens $($foo:tt)*) => ();
(($($arms:tt)*) $tokens:ident $name:ident { $variant:ident, $($next:tt)*}) => {
generate_to_tokens!(
($($arms)* $name::$variant => {})
$tokens $name { $($next)* }
);
};
(($($arms:tt)*) $tokens:ident $name:ident { $variant:ident $member:ident, $($next:tt)*}) => {
generate_to_tokens!(
($($arms)* $name::$variant(_e) => _e.to_tokens($tokens),)
$tokens $name { $($next)* }
);
};
(($($arms:tt)*) $tokens:ident $name:ident {}) => {
impl ::quote::ToTokens for $name {
fn to_tokens(&self, $tokens: &mut ::proc_macro2::TokenStream) {
match self {
$($arms)*
}
}
}
};
}
macro_rules! strip_attrs_pub {
($mac:ident!($(#[$m:meta])* $pub:ident $($t:tt)*)) => {
check_keyword_matches!(pub $pub);
$mac!([$(#[$m])* $pub] $($t)*);
};
}
macro_rules! check_keyword_matches {
(struct struct) => {};
(enum enum) => {};
(pub pub) => {};
}
|
