67 lines
2.1 KiB
Rust
67 lines
2.1 KiB
Rust
// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! lint on `use`ing all variants of an enum
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use crate::rustc::hir::def::Def;
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use crate::rustc::hir::*;
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use crate::rustc::lint::{LateContext, LateLintPass, LintArray, LintPass};
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use crate::rustc::{declare_tool_lint, lint_array};
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use crate::syntax::ast::NodeId;
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use crate::syntax::source_map::Span;
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use crate::utils::span_lint;
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/// **What it does:** Checks for `use Enum::*`.
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///
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/// **Why is this bad?** It is usually better style to use the prefixed name of
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/// an enumeration variant, rather than importing variants.
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///
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/// **Known problems:** Old-style enumerations that prefix the variants are
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/// still around.
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///
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/// **Example:**
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/// ```rust
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/// use std::cmp::Ordering::*;
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/// ```
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declare_clippy_lint! {
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pub ENUM_GLOB_USE,
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pedantic,
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"use items that import all variants of an enum"
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}
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pub struct EnumGlobUse;
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impl LintPass for EnumGlobUse {
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fn get_lints(&self) -> LintArray {
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lint_array!(ENUM_GLOB_USE)
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}
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}
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impl<'a, 'tcx> LateLintPass<'a, 'tcx> for EnumGlobUse {
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fn check_mod(&mut self, cx: &LateContext<'a, 'tcx>, m: &'tcx Mod, _: Span, _: NodeId) {
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// only check top level `use` statements
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for item in &m.item_ids {
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self.lint_item(cx, cx.tcx.hir().expect_item(item.id));
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}
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}
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}
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impl EnumGlobUse {
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fn lint_item(&self, cx: &LateContext<'_, '_>, item: &Item) {
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if item.vis.node.is_pub() {
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return; // re-exports are fine
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}
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if let ItemKind::Use(ref path, UseKind::Glob) = item.node {
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if let Def::Enum(_) = path.def {
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span_lint(cx, ENUM_GLOB_USE, item.span, "don't use glob imports for enum variants");
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}
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}
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}
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}
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