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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
//! Display and pretty printing routines.
use std::fmt::{self, Write};
use hir_expand::mod_path::PathKind;
use intern::Interned;
use itertools::Itertools;
use crate::{
path::{GenericArg, GenericArgs, Path},
type_ref::{Mutability, TraitBoundModifier, TypeBound, TypeRef},
};
pub(crate) fn print_path(path: &Path, buf: &mut dyn Write) -> fmt::Result {
match path.type_anchor() {
Some(anchor) => {
write!(buf, "<")?;
print_type_ref(anchor, buf)?;
write!(buf, ">::")?;
}
None => match path.kind() {
PathKind::Plain => {}
PathKind::Super(0) => write!(buf, "self")?,
PathKind::Super(n) => {
for i in 0..*n {
if i == 0 {
buf.write_str("super")?;
} else {
buf.write_str("::super")?;
}
}
}
PathKind::Crate => write!(buf, "crate")?,
PathKind::Abs => {}
PathKind::DollarCrate(_) => write!(buf, "$crate")?,
},
}
for (i, segment) in path.segments().iter().enumerate() {
if i != 0 || !matches!(path.kind(), PathKind::Plain) {
write!(buf, "::")?;
}
write!(buf, "{}", segment.name)?;
if let Some(generics) = segment.args_and_bindings {
write!(buf, "::<")?;
print_generic_args(generics, buf)?;
write!(buf, ">")?;
}
}
Ok(())
}
pub(crate) fn print_generic_args(generics: &GenericArgs, buf: &mut dyn Write) -> fmt::Result {
let mut first = true;
let args = if generics.has_self_type {
let (self_ty, args) = generics.args.split_first().unwrap();
write!(buf, "Self=")?;
print_generic_arg(self_ty, buf)?;
first = false;
args
} else {
&generics.args
};
for arg in args {
if !first {
write!(buf, ", ")?;
}
first = false;
print_generic_arg(arg, buf)?;
}
for binding in generics.bindings.iter() {
if !first {
write!(buf, ", ")?;
}
first = false;
write!(buf, "{}", binding.name)?;
if !binding.bounds.is_empty() {
write!(buf, ": ")?;
print_type_bounds(&binding.bounds, buf)?;
}
if let Some(ty) = &binding.type_ref {
write!(buf, " = ")?;
print_type_ref(ty, buf)?;
}
}
Ok(())
}
pub(crate) fn print_generic_arg(arg: &GenericArg, buf: &mut dyn Write) -> fmt::Result {
match arg {
GenericArg::Type(ty) => print_type_ref(ty, buf),
GenericArg::Const(c) => write!(buf, "{c}"),
GenericArg::Lifetime(lt) => write!(buf, "{}", lt.name),
}
}
pub(crate) fn print_type_ref(type_ref: &TypeRef, buf: &mut dyn Write) -> fmt::Result {
// FIXME: deduplicate with `HirDisplay` impl
match type_ref {
TypeRef::Never => write!(buf, "!")?,
TypeRef::Placeholder => write!(buf, "_")?,
TypeRef::Tuple(fields) => {
write!(buf, "(")?;
for (i, field) in fields.iter().enumerate() {
if i != 0 {
write!(buf, ", ")?;
}
print_type_ref(field, buf)?;
}
write!(buf, ")")?;
}
TypeRef::Path(path) => print_path(path, buf)?,
TypeRef::RawPtr(pointee, mtbl) => {
let mtbl = match mtbl {
Mutability::Shared => "*const",
Mutability::Mut => "*mut",
};
write!(buf, "{mtbl} ")?;
print_type_ref(pointee, buf)?;
}
TypeRef::Reference(pointee, lt, mtbl) => {
let mtbl = match mtbl {
Mutability::Shared => "",
Mutability::Mut => "mut ",
};
write!(buf, "&")?;
if let Some(lt) = lt {
write!(buf, "{} ", lt.name)?;
}
write!(buf, "{mtbl}")?;
print_type_ref(pointee, buf)?;
}
TypeRef::Array(elem, len) => {
write!(buf, "[")?;
print_type_ref(elem, buf)?;
write!(buf, "; {len}]")?;
}
TypeRef::Slice(elem) => {
write!(buf, "[")?;
print_type_ref(elem, buf)?;
write!(buf, "]")?;
}
TypeRef::Fn(args_and_ret, varargs, is_unsafe) => {
let ((_, return_type), args) =
args_and_ret.split_last().expect("TypeRef::Fn is missing return type");
if *is_unsafe {
write!(buf, "unsafe ")?;
}
write!(buf, "fn(")?;
for (i, (_, typeref)) in args.iter().enumerate() {
if i != 0 {
write!(buf, ", ")?;
}
print_type_ref(typeref, buf)?;
}
if *varargs {
if !args.is_empty() {
write!(buf, ", ")?;
}
write!(buf, "...")?;
}
write!(buf, ") -> ")?;
print_type_ref(return_type, buf)?;
}
TypeRef::Macro(_ast_id) => {
write!(buf, "<macro>")?;
}
TypeRef::Error => write!(buf, "{{unknown}}")?,
TypeRef::ImplTrait(bounds) => {
write!(buf, "impl ")?;
print_type_bounds(bounds, buf)?;
}
TypeRef::DynTrait(bounds) => {
write!(buf, "dyn ")?;
print_type_bounds(bounds, buf)?;
}
}
Ok(())
}
pub(crate) fn print_type_bounds(
bounds: &[Interned<TypeBound>],
buf: &mut dyn Write,
) -> fmt::Result {
for (i, bound) in bounds.iter().enumerate() {
if i != 0 {
write!(buf, " + ")?;
}
match bound.as_ref() {
TypeBound::Path(path, modifier) => {
match modifier {
TraitBoundModifier::None => (),
TraitBoundModifier::Maybe => write!(buf, "?")?,
}
print_path(path, buf)?;
}
TypeBound::ForLifetime(lifetimes, path) => {
write!(buf, "for<{}> ", lifetimes.iter().format(", "))?;
print_path(path, buf)?;
}
TypeBound::Lifetime(lt) => write!(buf, "{}", lt.name)?,
TypeBound::Error => write!(buf, "{{unknown}}")?,
}
}
Ok(())
}
|
