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Declare lint and implement lint logic.
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use crate::utils::span_lint_and_sugg; | ||
use if_chain::if_chain; | ||
use rustc_errors::Applicability; | ||
use rustc_lint::{EarlyContext, EarlyLintPass}; | ||
use rustc_session::{declare_lint_pass, declare_tool_lint}; | ||
use rustc_span::edition::Edition; | ||
use syntax::ast::{Item, ItemKind, UseTreeKind}; | ||
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declare_clippy_lint! { | ||
/// **What it does:** Checking for imports with single component use path. | ||
/// | ||
/// **Why is this bad?** Import with single component use path such as `use cratename;` | ||
/// is not necessary, and thus should be removed. | ||
/// | ||
/// **Known problems:** None. | ||
/// | ||
/// **Example:** | ||
/// | ||
/// ```rust, ignore | ||
/// use regex; | ||
/// | ||
/// fn main() { | ||
/// regex::Regex::new(r"^\d{4}-\d{2}-\d{2}$").unwrap(); | ||
/// } | ||
/// ``` | ||
/// Better as | ||
/// ```rust, ignore | ||
/// fn main() { | ||
/// regex::Regex::new(r"^\d{4}-\d{2}-\d{2}$").unwrap(); | ||
/// } | ||
/// ``` | ||
pub SINGLE_COMPONENT_PATH_IMPORTS, | ||
style, | ||
"imports with single component path are redundant" | ||
} | ||
|
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declare_lint_pass!(SingleComponentPathImports => [SINGLE_COMPONENT_PATH_IMPORTS]); | ||
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impl EarlyLintPass for SingleComponentPathImports { | ||
fn check_item(&mut self, cx: &EarlyContext<'_>, item: &Item) { | ||
if_chain! { | ||
if cx.sess.opts.edition == Edition::Edition2018; | ||
if !item.vis.node.is_pub(); | ||
if let ItemKind::Use(use_tree) = &item.kind; | ||
if let segments = &use_tree.prefix.segments; | ||
if segments.len() == 1; | ||
if let UseTreeKind::Simple(None, _, _) = use_tree.kind; | ||
then { | ||
span_lint_and_sugg( | ||
cx, | ||
SINGLE_COMPONENT_PATH_IMPORTS, | ||
item.span, | ||
"this import is redundant", | ||
"remove it entirely", | ||
String::new(), | ||
Applicability::MachineApplicable | ||
); | ||
} | ||
} | ||
} | ||
} |
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