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
|
//! FIXME: write short doc here
use std::sync::Arc;
use ra_syntax::ast;
use rustc_hash::FxHashSet;
use crate::{
db::HirDatabase,
diagnostics::{DiagnosticSink, MissingFields, MissingOkInTailExpr},
expr::AstPtr,
path::known,
ty::{ApplicationTy, InferenceResult, Ty, TypeCtor},
Adt, Function, Name, Path,
};
use super::{Expr, ExprId, RecordLitField};
pub(crate) struct ExprValidator<'a, 'b: 'a> {
func: Function,
infer: Arc<InferenceResult>,
sink: &'a mut DiagnosticSink<'b>,
}
impl<'a, 'b> ExprValidator<'a, 'b> {
pub(crate) fn new(
func: Function,
infer: Arc<InferenceResult>,
sink: &'a mut DiagnosticSink<'b>,
) -> ExprValidator<'a, 'b> {
ExprValidator { func, infer, sink }
}
pub(crate) fn validate_body(&mut self, db: &impl HirDatabase) {
let body = self.func.body(db);
for e in body.exprs() {
if let (id, Expr::RecordLit { path, fields, spread }) = e {
self.validate_record_literal(id, path, fields, *spread, db);
}
}
let body_expr = &body[body.body_expr()];
if let Expr::Block { statements: _, tail: Some(t) } = body_expr {
self.validate_results_in_tail_expr(body.body_expr(), *t, db);
}
}
fn validate_record_literal(
&mut self,
id: ExprId,
_path: &Option<Path>,
fields: &[RecordLitField],
spread: Option<ExprId>,
db: &impl HirDatabase,
) {
if spread.is_some() {
return;
}
let struct_def = match self.infer[id].as_adt() {
Some((Adt::Struct(s), _)) => s,
_ => return,
};
let lit_fields: FxHashSet<_> = fields.iter().map(|f| &f.name).collect();
let missed_fields: Vec<Name> = struct_def
.fields(db)
.iter()
.filter_map(|f| {
let name = f.name(db);
if lit_fields.contains(&name) {
None
} else {
Some(name)
}
})
.collect();
if missed_fields.is_empty() {
return;
}
let source_map = self.func.body_source_map(db);
if let Some(source_ptr) = source_map.expr_syntax(id) {
if let Some(expr) = source_ptr.ast.a() {
let root = source_ptr.file_syntax(db);
if let ast::Expr::RecordLit(record_lit) = expr.to_node(&root) {
if let Some(field_list) = record_lit.record_field_list() {
self.sink.push(MissingFields {
file: source_ptr.file_id,
field_list: AstPtr::new(&field_list),
missed_fields,
})
}
}
}
}
}
fn validate_results_in_tail_expr(
&mut self,
body_id: ExprId,
id: ExprId,
db: &impl HirDatabase,
) {
// the mismatch will be on the whole block currently
let mismatch = match self.infer.type_mismatch_for_expr(body_id) {
Some(m) => m,
None => return,
};
let std_result_path = known::std_result_result();
let resolver = self.func.resolver(db);
let std_result_enum = match resolver.resolve_known_enum(db, &std_result_path) {
Some(it) => it,
_ => return,
};
let std_result_ctor = TypeCtor::Adt(Adt::Enum(std_result_enum));
let params = match &mismatch.expected {
Ty::Apply(ApplicationTy { ctor, parameters }) if ctor == &std_result_ctor => parameters,
_ => return,
};
if params.len() == 2 && ¶ms[0] == &mismatch.actual {
let source_map = self.func.body_source_map(db);
if let Some(source_ptr) = source_map.expr_syntax(id) {
if let Some(expr) = source_ptr.ast.a() {
self.sink.push(MissingOkInTailExpr { file: source_ptr.file_id, expr });
}
}
}
}
}
|
