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
use middle::def::*;
use middle::ty;
use util::nodemap::FnvHashMap;
use syntax::ast;
use syntax::ast_util::walk_pat;
use syntax::codemap::{Span, DUMMY_SP};
pub type PatIdMap = FnvHashMap<ast::Ident, ast::NodeId>;
pub fn pat_id_map(dm: &DefMap, pat: &ast::Pat) -> PatIdMap {
let mut map = FnvHashMap();
pat_bindings(dm, pat, |_bm, p_id, _s, path1| {
map.insert(path1.node, p_id);
});
map
}
pub fn pat_is_refutable(dm: &DefMap, pat: &ast::Pat) -> bool {
match pat.node {
ast::PatLit(_) | ast::PatRange(_, _) => true,
ast::PatEnum(_, _) |
ast::PatIdent(_, _, None) |
ast::PatStruct(..) => {
match dm.borrow().get(&pat.id).map(|d| d.full_def()) {
Some(DefVariant(..)) => true,
_ => false
}
}
ast::PatVec(_, _, _) => true,
_ => false
}
}
pub fn pat_is_variant_or_struct(dm: &DefMap, pat: &ast::Pat) -> bool {
match pat.node {
ast::PatEnum(_, _) |
ast::PatIdent(_, _, None) |
ast::PatStruct(..) => {
match dm.borrow().get(&pat.id).map(|d| d.full_def()) {
Some(DefVariant(..)) | Some(DefStruct(..)) => true,
_ => false
}
}
_ => false
}
}
pub fn pat_is_const(dm: &DefMap, pat: &ast::Pat) -> bool {
match pat.node {
ast::PatIdent(_, _, None) | ast::PatEnum(..) => {
match dm.borrow().get(&pat.id).map(|d| d.full_def()) {
Some(DefConst(..)) => true,
_ => false
}
}
_ => false
}
}
pub fn pat_is_binding(dm: &DefMap, pat: &ast::Pat) -> bool {
match pat.node {
ast::PatIdent(..) => {
!pat_is_variant_or_struct(dm, pat) &&
!pat_is_const(dm, pat)
}
_ => false
}
}
pub fn pat_is_binding_or_wild(dm: &DefMap, pat: &ast::Pat) -> bool {
match pat.node {
ast::PatIdent(..) => pat_is_binding(dm, pat),
ast::PatWild(_) => true,
_ => false
}
}
pub fn pat_bindings<I>(dm: &DefMap, pat: &ast::Pat, mut it: I) where
I: FnMut(ast::BindingMode, ast::NodeId, Span, &ast::SpannedIdent),
{
walk_pat(pat, |p| {
match p.node {
ast::PatIdent(binding_mode, ref pth, _) if pat_is_binding(dm, p) => {
it(binding_mode, p.id, p.span, pth);
}
_ => {}
}
true
});
}
pub fn pat_contains_bindings(dm: &DefMap, pat: &ast::Pat) -> bool {
let mut contains_bindings = false;
walk_pat(pat, |p| {
if pat_is_binding(dm, p) {
contains_bindings = true;
false
} else {
true
}
});
contains_bindings
}
pub fn pat_contains_ref_binding(dm: &DefMap, pat: &ast::Pat) -> bool {
let mut result = false;
pat_bindings(dm, pat, |mode, _, _, _| {
match mode {
ast::BindingMode::BindByRef(_) => { result = true; }
ast::BindingMode::BindByValue(_) => { }
}
});
result
}
pub fn arm_contains_ref_binding(dm: &DefMap, arm: &ast::Arm) -> bool {
arm.pats.iter().any(|pat| pat_contains_ref_binding(dm, pat))
}
pub fn pat_contains_bindings_or_wild(dm: &DefMap, pat: &ast::Pat) -> bool {
let mut contains_bindings = false;
walk_pat(pat, |p| {
if pat_is_binding_or_wild(dm, p) {
contains_bindings = true;
false
} else {
true
}
});
contains_bindings
}
pub fn simple_identifier<'a>(pat: &'a ast::Pat) -> Option<&'a ast::Ident> {
match pat.node {
ast::PatIdent(ast::BindByValue(_), ref path1, None) => {
Some(&path1.node)
}
_ => {
None
}
}
}
pub fn def_to_path(tcx: &ty::ctxt, id: ast::DefId) -> ast::Path {
ty::with_path(tcx, id, |path| ast::Path {
global: false,
segments: path.last().map(|elem| ast::PathSegment {
identifier: ast::Ident::new(elem.name()),
parameters: ast::PathParameters::none(),
}).into_iter().collect(),
span: DUMMY_SP,
})
}