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
|
use clippy_utils::diagnostics::span_lint_and_sugg;
use clippy_utils::ty::is_type_diagnostic_item;
use rustc_ast::ast::LitKind;
use rustc_errors::Applicability;
use rustc_hir::{Expr, ExprKind};
use rustc_lint::LateContext;
use rustc_span::symbol::sym;
use std::path::{Component, Path};
use super::PATH_BUF_PUSH_OVERWRITE;
pub(super) fn check<'tcx>(cx: &LateContext<'tcx>, expr: &'tcx Expr<'_>, arg: &'tcx Expr<'_>) {
if let Some(method_id) = cx.typeck_results().type_dependent_def_id(expr.hir_id)
&& let Some(impl_id) = cx.tcx.impl_of_method(method_id)
&& is_type_diagnostic_item(cx, cx.tcx.type_of(impl_id).instantiate_identity(), sym::PathBuf)
&& let ExprKind::Lit(lit) = arg.kind
&& let LitKind::Str(ref path_lit, _) = lit.node
&& let pushed_path = Path::new(path_lit.as_str())
&& let Some(pushed_path_lit) = pushed_path.to_str()
&& pushed_path.has_root()
&& let Some(root) = pushed_path.components().next()
&& root == Component::RootDir
{
span_lint_and_sugg(
cx,
PATH_BUF_PUSH_OVERWRITE,
lit.span,
"calling `push` with '/' or '\\' (file system root) will overwrite the previous path definition",
"try",
format!("\"{}\"", pushed_path_lit.trim_start_matches(['/', '\\'])),
Applicability::MaybeIncorrect,
);
}
}
|
