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
|
//! A module with ide helpers for high-level ide features.
use crate::RootDatabase;
use hir::{Crate, Enum, Module, ScopeDef, Semantics, Trait};
use syntax::ast::{self, make};
pub mod insert_use;
/// Converts the mod path struct into its ast representation.
pub fn mod_path_to_ast(path: &hir::ModPath) -> ast::Path {
let _p = profile::span("mod_path_to_ast");
let mut segments = Vec::new();
let mut is_abs = false;
match path.kind {
hir::PathKind::Plain => {}
hir::PathKind::Super(0) => segments.push(make::path_segment_self()),
hir::PathKind::Super(n) => segments.extend((0..n).map(|_| make::path_segment_super())),
hir::PathKind::DollarCrate(_) | hir::PathKind::Crate => {
segments.push(make::path_segment_crate())
}
hir::PathKind::Abs => is_abs = true,
}
segments.extend(
path.segments
.iter()
.map(|segment| make::path_segment(make::name_ref(&segment.to_string()))),
);
make::path_from_segments(segments, is_abs)
}
/// Helps with finding well-know things inside the standard library. This is
/// somewhat similar to the known paths infra inside hir, but it different; We
/// want to make sure that IDE specific paths don't become interesting inside
/// the compiler itself as well.
pub struct FamousDefs<'a, 'b>(pub &'a Semantics<'b, RootDatabase>, pub Option<Crate>);
#[allow(non_snake_case)]
impl FamousDefs<'_, '_> {
pub const FIXTURE: &'static str = r#"//- /libcore.rs crate:core
pub mod convert {
pub trait From<T> {
fn from(t: T) -> Self;
}
}
pub mod default {
pub trait Default {
fn default() -> Self;
}
}
pub mod iter {
pub use self::traits::{collect::IntoIterator, iterator::Iterator};
mod traits {
pub(crate) mod iterator {
use crate::option::Option;
pub trait Iterator {
type Item;
fn next(&mut self) -> Option<Self::Item>;
fn by_ref(&mut self) -> &mut Self {
self
}
fn take(self, n: usize) -> crate::iter::Take<Self> {
crate::iter::Take { inner: self }
}
}
impl<I: Iterator> Iterator for &mut I {
type Item = I::Item;
fn next(&mut self) -> Option<I::Item> {
(**self).next()
}
}
}
pub(crate) mod collect {
pub trait IntoIterator {
type Item;
}
}
}
pub use self::sources::*;
pub(crate) mod sources {
use super::Iterator;
use crate::option::Option::{self, *};
pub struct Repeat<A> {
element: A,
}
pub fn repeat<T>(elt: T) -> Repeat<T> {
Repeat { element: elt }
}
impl<A> Iterator for Repeat<A> {
type Item = A;
fn next(&mut self) -> Option<A> {
None
}
}
}
pub use self::adapters::*;
pub(crate) mod adapters {
use super::Iterator;
use crate::option::Option::{self, *};
pub struct Take<I> { pub(crate) inner: I }
impl<I> Iterator for Take<I> where I: Iterator {
type Item = <I as Iterator>::Item;
fn next(&mut self) -> Option<<I as Iterator>::Item> {
None
}
}
}
}
pub mod option {
pub enum Option<T> { None, Some(T)}
}
pub mod prelude {
pub use crate::{convert::From, iter::{IntoIterator, Iterator}, option::Option::{self, *}, default::Default};
}
#[prelude_import]
pub use prelude::*;
"#;
pub fn core(&self) -> Option<Crate> {
self.find_crate("core")
}
pub fn core_convert_From(&self) -> Option<Trait> {
self.find_trait("core:convert:From")
}
pub fn core_option_Option(&self) -> Option<Enum> {
self.find_enum("core:option:Option")
}
pub fn core_default_Default(&self) -> Option<Trait> {
self.find_trait("core:default:Default")
}
pub fn core_iter_Iterator(&self) -> Option<Trait> {
self.find_trait("core:iter:traits:iterator:Iterator")
}
pub fn core_iter(&self) -> Option<Module> {
self.find_module("core:iter")
}
fn find_trait(&self, path: &str) -> Option<Trait> {
match self.find_def(path)? {
hir::ScopeDef::ModuleDef(hir::ModuleDef::Trait(it)) => Some(it),
_ => None,
}
}
fn find_enum(&self, path: &str) -> Option<Enum> {
match self.find_def(path)? {
hir::ScopeDef::ModuleDef(hir::ModuleDef::Adt(hir::Adt::Enum(it))) => Some(it),
_ => None,
}
}
fn find_module(&self, path: &str) -> Option<Module> {
match self.find_def(path)? {
hir::ScopeDef::ModuleDef(hir::ModuleDef::Module(it)) => Some(it),
_ => None,
}
}
fn find_crate(&self, name: &str) -> Option<Crate> {
let krate = self.1?;
let db = self.0.db;
let res =
krate.dependencies(db).into_iter().find(|dep| dep.name.to_string() == name)?.krate;
Some(res)
}
fn find_def(&self, path: &str) -> Option<ScopeDef> {
let db = self.0.db;
let mut path = path.split(':');
let trait_ = path.next_back()?;
let std_crate = path.next()?;
let std_crate = self.find_crate(std_crate)?;
let mut module = std_crate.root_module(db);
for segment in path {
module = module.children(db).find_map(|child| {
let name = child.name(db)?;
if name.to_string() == segment {
Some(child)
} else {
None
}
})?;
}
let def =
module.scope(db, None).into_iter().find(|(name, _def)| name.to_string() == trait_)?.1;
Some(def)
}
}
|
