81 lines
2.2 KiB
Rust
81 lines
2.2 KiB
Rust
use rustc::lint::*;
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use syntax::ast::*;
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use syntax::codemap::Span;
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use syntax::symbol::InternedString;
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use utils::span_lint;
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/// **What it does:** Checks for imports that remove "unsafe" from an item's
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/// name.
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///
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/// **Why is this bad?** Renaming makes it less clear which traits and
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/// structures are unsafe.
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///
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/// **Known problems:** None.
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///
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/// **Example:**
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/// ```rust,ignore
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/// use std::cell::{UnsafeCell as TotallySafeCell};
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///
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/// extern crate crossbeam;
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/// use crossbeam::{spawn_unsafe as spawn};
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/// ```
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declare_clippy_lint! {
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pub UNSAFE_REMOVED_FROM_NAME,
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style,
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"`unsafe` removed from API names on import"
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}
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pub struct UnsafeNameRemoval;
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impl LintPass for UnsafeNameRemoval {
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fn get_lints(&self) -> LintArray {
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lint_array!(UNSAFE_REMOVED_FROM_NAME)
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}
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}
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impl EarlyLintPass for UnsafeNameRemoval {
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fn check_item(&mut self, cx: &EarlyContext, item: &Item) {
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if let ItemKind::Use(ref use_tree) = item.node {
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check_use_tree(use_tree, cx, &item.span);
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}
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}
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}
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fn check_use_tree(use_tree: &UseTree, cx: &EarlyContext, span: &Span) {
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match use_tree.kind {
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UseTreeKind::Simple(Some(new_name)) => {
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let old_name = use_tree
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.prefix
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.segments
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.last()
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.expect("use paths cannot be empty")
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.identifier;
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unsafe_to_safe_check(old_name, new_name, cx, span);
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}
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UseTreeKind::Simple(None) |
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UseTreeKind::Glob => {},
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UseTreeKind::Nested(ref nested_use_tree) => {
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for &(ref use_tree, _) in nested_use_tree {
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check_use_tree(use_tree, cx, span);
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}
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}
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}
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}
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fn unsafe_to_safe_check(old_name: Ident, new_name: Ident, cx: &EarlyContext, span: &Span) {
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let old_str = old_name.name.as_str();
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let new_str = new_name.name.as_str();
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if contains_unsafe(&old_str) && !contains_unsafe(&new_str) {
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span_lint(
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cx,
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UNSAFE_REMOVED_FROM_NAME,
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*span,
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&format!("removed \"unsafe\" from the name of `{}` in use as `{}`", old_str, new_str),
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);
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}
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}
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fn contains_unsafe(name: &InternedString) -> bool {
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name.contains("Unsafe") || name.contains("unsafe")
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}
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