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This commit is contained in:
Michael Wright 2018-09-29 14:18:50 +02:00
parent efdc739dfc
commit 06f6b36025
1 changed files with 11 additions and 9 deletions
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20
clippy_lints/src/methods/unnecessary_filter_map.rs
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@ -1,29 +1,27 @@
use crate::rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
use crate::rustc::lint::LateContext;
use crate::rustc::hir;
use crate::rustc::hir::def::Def;
use crate::rustc::hir::intravisit::{walk_expr, NestedVisitorMap, Visitor};
use crate::rustc::lint::LateContext;
use crate::syntax::ast;
use crate::utils::{match_qpath, match_trait_method, span_lint};
use crate::utils::paths;
use crate::utils::usage::mutated_variables;
use crate::utils::{match_qpath, match_trait_method, span_lint};
use if_chain::if_chain;
use super::UNNECESSARY_FILTER_MAP;
pub(super) fn lint(cx: &LateContext<'_, '_>, expr: &hir::Expr, args: &[hir::Expr]) {
if !match_trait_method(cx, expr, &paths::ITERATOR) {
return;
}
if let hir::ExprKind::Closure(_, _, body_id, ..) = args[1].node {
let body = cx.tcx.hir.body(body_id);
let arg_id = body.arguments[0].pat.id;
let mutates_arg = match mutated_variables(&body.value, cx) {
Some(used_mutably) => used_mutably.contains(&arg_id),
None => true,
Some(used_mutably) => used_mutably.contains(&arg_id),
None => true,
};
let (mut found_mapping, mut found_filtering) = check_expression(&cx, arg_id, &body.value);
@ -56,7 +54,11 @@ pub(super) fn lint(cx: &LateContext<'_, '_>, expr: &hir::Expr, args: &[hir::Expr
}
// returns (found_mapping, found_filtering)
fn check_expression<'a, 'tcx: 'a>(cx: &'a LateContext<'a, 'tcx>, arg_id: ast::NodeId, expr: &'tcx hir::Expr) -> (bool, bool) {
fn check_expression<'a, 'tcx: 'a>(
cx: &'a LateContext<'a, 'tcx>,
arg_id: ast::NodeId,
expr: &'tcx hir::Expr,
) -> (bool, bool) {
match &expr.node {
hir::ExprKind::Call(ref func, ref args) => {
if_chain! {
@ -105,7 +107,7 @@ fn check_expression<'a, 'tcx: 'a>(cx: &'a LateContext<'a, 'tcx>, arg_id: ast::No
(found_mapping, found_filtering)
},
hir::ExprKind::Path(path) if match_qpath(path, &paths::OPTION_NONE) => (false, true),
_ => (true, true)
_ => (true, true),
}
}