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
|
use super::*;
pub(super) fn type_(p: &mut Parser) {
match p.current() {
L_PAREN => paren_or_tuple_type(p),
EXCL => never_type(p),
STAR => pointer_type(p),
L_BRACK => array_or_slice_type(p),
AMPERSAND => reference_type(p),
UNDERSCORE => placeholder_type(p),
FN_KW | UNSAFE_KW | EXTERN_KW => fn_pointer_type(p),
FOR_KW => for_type(p),
_ if paths::is_path_start(p) => path_type(p),
_ => {
p.error("expected type");
}
}
}
fn type_no_plus(p: &mut Parser) {
type_(p);
}
fn paren_or_tuple_type(p: &mut Parser) {
assert!(p.at(L_PAREN));
let m = p.start();
p.bump();
let mut n_types: u32 = 0;
let mut trailing_comma: bool = false;
while !p.at(EOF) && !p.at(R_PAREN) {
n_types += 1;
type_(p);
if p.eat(COMMA) {
trailing_comma = true;
} else {
trailing_comma = false;
break;
}
}
p.expect(R_PAREN);
let kind = if n_types == 1 && !trailing_comma {
// test paren_type
// type T = (i32);
PAREN_TYPE
} else {
// test unit_type
// type T = ();
// test singleton_tuple_type
// type T = (i32,);
TUPLE_TYPE
};
m.complete(p, kind);
}
// test never_type
// type Never = !;
fn never_type(p: &mut Parser) {
assert!(p.at(EXCL));
let m = p.start();
p.bump();
m.complete(p, NEVER_TYPE);
}
fn pointer_type(p: &mut Parser) {
assert!(p.at(STAR));
let m = p.start();
p.bump();
match p.current() {
// test pointer_type_mut
// type M = *mut ();
// type C = *mut ();
MUT_KW | CONST_KW => p.bump(),
_ => {
// test pointer_type_no_mutability
// type T = *();
p.error(
"expected mut or const in raw pointer type \
(use `*mut T` or `*const T` as appropriate)",
);
}
};
type_no_plus(p);
m.complete(p, POINTER_TYPE);
}
fn array_or_slice_type(p: &mut Parser) {
assert!(p.at(L_BRACK));
let m = p.start();
p.bump();
type_(p);
let kind = match p.current() {
// test slice_type
// type T = [()];
R_BRACK => {
p.bump();
SLICE_TYPE
}
// test array_type
// type T = [(); 92];
SEMI => {
p.bump();
expressions::expr(p);
p.expect(R_BRACK);
ARRAY_TYPE
}
// test array_type_missing_semi
// type T = [() 92];
_ => {
p.error("expected `;` or `]`");
SLICE_TYPE
}
};
m.complete(p, kind);
}
// test reference_type;
// type A = &();
// type B = &'static ();
// type C = &mut ();
fn reference_type(p: &mut Parser) {
assert!(p.at(AMPERSAND));
let m = p.start();
p.bump();
p.eat(LIFETIME);
p.eat(MUT_KW);
type_no_plus(p);
m.complete(p, REFERENCE_TYPE);
}
// test placeholder_type
// type Placeholder = _;
fn placeholder_type(p: &mut Parser) {
assert!(p.at(UNDERSCORE));
let m = p.start();
p.bump();
m.complete(p, PLACEHOLDER_TYPE);
}
// test fn_pointer_type
// type A = fn();
// type B = unsafe fn();
// type C = unsafe extern "C" fn();
fn fn_pointer_type(p: &mut Parser) {
let m = p.start();
p.eat(UNSAFE_KW);
if p.at(EXTERN_KW) {
abi(p);
}
// test fn_pointer_type_missing_fn
// type F = unsafe ();
if !p.eat(FN_KW) {
m.abandon(p);
p.error("expected `fn`");
return;
}
fn_value_parameters(p);
// test fn_pointer_type_with_ret
// type F = fn() -> ();
fn_ret_type(p);
m.complete(p, FN_POINTER_TYPE);
}
// test for_type
// type A = for<'a> fn() -> ();
fn for_type(p: &mut Parser) {
assert!(p.at(FOR_KW));
let m = p.start();
p.bump();
type_params::list(p);
type_(p);
m.complete(p, FOR_TYPE);
}
// test path_type
// type A = Foo;
// type B = ::Foo;
// type C = self::Foo;
// type D = super::Foo;
fn path_type(p: &mut Parser) {
assert!(paths::is_path_start(p));
let m = p.start();
paths::type_path(p);
m.complete(p, PATH_TYPE);
}
|