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
|
//! Assorted functions shared by several assists.
pub(crate) mod insert_use;
use std::iter;
use hir::{Adt, Crate, Semantics, Trait, Type};
use ra_ide_db::RootDatabase;
use ra_syntax::{
ast::{self, make, NameOwner},
AstNode, T,
};
use rustc_hash::FxHashSet;
pub(crate) use insert_use::insert_use_statement;
pub fn get_missing_impl_items(
sema: &Semantics<RootDatabase>,
impl_def: &ast::ImplDef,
) -> Vec<hir::AssocItem> {
// Names must be unique between constants and functions. However, type aliases
// may share the same name as a function or constant.
let mut impl_fns_consts = FxHashSet::default();
let mut impl_type = FxHashSet::default();
if let Some(item_list) = impl_def.item_list() {
for item in item_list.impl_items() {
match item {
ast::ImplItem::FnDef(f) => {
if let Some(n) = f.name() {
impl_fns_consts.insert(n.syntax().to_string());
}
}
ast::ImplItem::TypeAliasDef(t) => {
if let Some(n) = t.name() {
impl_type.insert(n.syntax().to_string());
}
}
ast::ImplItem::ConstDef(c) => {
if let Some(n) = c.name() {
impl_fns_consts.insert(n.syntax().to_string());
}
}
}
}
}
resolve_target_trait(sema, impl_def).map_or(vec![], |target_trait| {
target_trait
.items(sema.db)
.iter()
.filter(|i| match i {
hir::AssocItem::Function(f) => {
!impl_fns_consts.contains(&f.name(sema.db).to_string())
}
hir::AssocItem::TypeAlias(t) => !impl_type.contains(&t.name(sema.db).to_string()),
hir::AssocItem::Const(c) => c
.name(sema.db)
.map(|n| !impl_fns_consts.contains(&n.to_string()))
.unwrap_or_default(),
})
.cloned()
.collect()
})
}
pub(crate) fn resolve_target_trait(
sema: &Semantics<RootDatabase>,
impl_def: &ast::ImplDef,
) -> Option<hir::Trait> {
let ast_path = impl_def
.target_trait()
.map(|it| it.syntax().clone())
.and_then(ast::PathType::cast)?
.path()?;
match sema.resolve_path(&ast_path) {
Some(hir::PathResolution::Def(hir::ModuleDef::Trait(def))) => Some(def),
_ => None,
}
}
pub(crate) fn invert_boolean_expression(expr: ast::Expr) -> ast::Expr {
if let Some(expr) = invert_special_case(&expr) {
return expr;
}
make::expr_prefix(T![!], expr)
}
fn invert_special_case(expr: &ast::Expr) -> Option<ast::Expr> {
match expr {
ast::Expr::BinExpr(bin) => match bin.op_kind()? {
ast::BinOp::NegatedEqualityTest => bin.replace_op(T![==]).map(|it| it.into()),
ast::BinOp::EqualityTest => bin.replace_op(T![!=]).map(|it| it.into()),
_ => None,
},
ast::Expr::PrefixExpr(pe) if pe.op_kind()? == ast::PrefixOp::Not => pe.expr(),
// FIXME:
// ast::Expr::Literal(true | false )
_ => None,
}
}
#[derive(Clone, Copy)]
pub(crate) enum TryEnum {
Result,
Option,
}
impl TryEnum {
const ALL: [TryEnum; 2] = [TryEnum::Option, TryEnum::Result];
pub(crate) fn from_ty(sema: &Semantics<RootDatabase>, ty: &Type) -> Option<TryEnum> {
let enum_ = match ty.as_adt() {
Some(Adt::Enum(it)) => it,
_ => return None,
};
TryEnum::ALL.iter().find_map(|&var| {
if &enum_.name(sema.db).to_string() == var.type_name() {
return Some(var);
}
None
})
}
pub(crate) fn happy_case(self) -> &'static str {
match self {
TryEnum::Result => "Ok",
TryEnum::Option => "Some",
}
}
pub(crate) fn sad_pattern(self) -> ast::Pat {
match self {
TryEnum::Result => make::tuple_struct_pat(
make::path_unqualified(make::path_segment(make::name_ref("Err"))),
iter::once(make::placeholder_pat().into()),
)
.into(),
TryEnum::Option => make::bind_pat(make::name("None")).into(),
}
}
fn type_name(self) -> &'static str {
match self {
TryEnum::Result => "Result",
TryEnum::Option => "Option",
}
}
}
/// 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(crate) struct FamousDefs<'a, 'b>(pub(crate) &'a Semantics<'b, RootDatabase>, pub(crate) Crate);
#[allow(non_snake_case)]
impl FamousDefs<'_, '_> {
#[cfg(test)]
pub(crate) const FIXTURE: &'static str = r#"
//- /libcore.rs crate:core
pub mod convert{
pub trait From<T> {
fn from(T) -> Self;
}
}
pub mod prelude { pub use crate::convert::From }
#[prelude_import]
pub use prelude::*;
"#;
pub(crate) fn core_convert_From(&self) -> Option<Trait> {
self.find_trait("core:convert:From")
}
fn find_trait(&self, path: &str) -> Option<Trait> {
let db = self.0.db;
let mut path = path.split(':');
let trait_ = path.next_back()?;
let std_crate = path.next()?;
let std_crate = self
.1
.dependencies(db)
.into_iter()
.find(|dep| &dep.name.to_string() == std_crate)?
.krate;
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;
match def {
hir::ScopeDef::ModuleDef(hir::ModuleDef::Trait(it)) => Some(it),
_ => None,
}
}
}
|
