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
|
use clippy_utils::diagnostics::span_lint;
use rustc_ast::ast::{Item, ItemKind, UseTree, UseTreeKind};
use rustc_lint::{EarlyContext, EarlyLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::source_map::Span;
use rustc_span::symbol::Ident;
declare_clippy_lint! {
/// ### What it does
/// Checks for imports that remove "unsafe" from an item's
/// name.
///
/// ### Why is this bad?
/// Renaming makes it less clear which traits and
/// structures are unsafe.
///
/// ### Example
/// ```rust,ignore
/// use std::cell::{UnsafeCell as TotallySafeCell};
///
/// extern crate crossbeam;
/// use crossbeam::{spawn_unsafe as spawn};
/// ```
#[clippy::version = "pre 1.29.0"]
pub UNSAFE_REMOVED_FROM_NAME,
style,
"`unsafe` removed from API names on import"
}
declare_lint_pass!(UnsafeNameRemoval => [UNSAFE_REMOVED_FROM_NAME]);
impl EarlyLintPass for UnsafeNameRemoval {
fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) {
if let ItemKind::Use(ref use_tree) = item.kind {
check_use_tree(use_tree, cx, item.span);
}
}
}
fn check_use_tree(use_tree: &UseTree, cx: &EarlyContext<'_>, span: Span) {
match use_tree.kind {
UseTreeKind::Simple(Some(new_name)) => {
let old_name = use_tree
.prefix
.segments
.last()
.expect("use paths cannot be empty")
.ident;
unsafe_to_safe_check(old_name, new_name, cx, span);
},
UseTreeKind::Simple(None) | UseTreeKind::Glob => {},
UseTreeKind::Nested(ref nested_use_tree) => {
for (use_tree, _) in nested_use_tree {
check_use_tree(use_tree, cx, span);
}
},
}
}
fn unsafe_to_safe_check(old_name: Ident, new_name: Ident, cx: &EarlyContext<'_>, span: Span) {
let old_str = old_name.name.as_str();
let new_str = new_name.name.as_str();
if contains_unsafe(old_str) && !contains_unsafe(new_str) {
span_lint(
cx,
UNSAFE_REMOVED_FROM_NAME,
span,
&format!("removed `unsafe` from the name of `{old_str}` in use as `{new_str}`"),
);
}
}
#[must_use]
fn contains_unsafe(name: &str) -> bool {
name.contains("Unsafe") || name.contains("unsafe")
}
|
