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export derefs_to_slice from methods module

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This commit is contained in:
Takayuki Maeda 2021-02-26 17:07:00 +09:00
parent 77907e6dab
commit c297174adf
3 changed files with 48 additions and 49 deletions
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5
clippy_lints/src/methods/iter_count.rs
View file

@ -1,6 +1,5 @@
use crate::utils::{
derefs_to_slice, is_type_diagnostic_item, match_type, paths, snippet_with_applicability, span_lint_and_sugg,
};
use crate::methods::derefs_to_slice;
use crate::utils::{is_type_diagnostic_item, match_type, paths, snippet_with_applicability, span_lint_and_sugg};
use rustc_errors::Applicability;
use rustc_hir::Expr;

52
clippy_lints/src/methods/mod.rs
View file

@ -33,12 +33,12 @@ use crate::consts::{constant, Constant};
use crate::utils::eager_or_lazy::is_lazyness_candidate;
use crate::utils::usage::mutated_variables;
use crate::utils::{
contains_return, contains_ty, derefs_to_slice, get_parent_expr, get_trait_def_id, has_iter_method, higher,
implements_trait, in_macro, is_copy, is_expn_of, is_type_diagnostic_item, iter_input_pats, last_path_segment,
match_def_path, match_qpath, match_trait_method, match_type, meets_msrv, method_calls, method_chain_args,
path_to_local_id, paths, remove_blocks, return_ty, single_segment_path, snippet, snippet_with_applicability,
snippet_with_macro_callsite, span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, strip_pat_refs,
sugg, walk_ptrs_ty_depth, SpanlessEq,
contains_return, contains_ty, get_parent_expr, get_trait_def_id, has_iter_method, higher, implements_trait,
in_macro, is_copy, is_expn_of, is_type_diagnostic_item, iter_input_pats, last_path_segment, match_def_path,
match_qpath, match_trait_method, match_type, meets_msrv, method_calls, method_chain_args, path_to_local_id, paths,
remove_blocks, return_ty, single_segment_path, snippet, snippet_with_applicability, snippet_with_macro_callsite,
span_lint, span_lint_and_help, span_lint_and_sugg, span_lint_and_then, strip_pat_refs, sugg, walk_ptrs_ty_depth,
SpanlessEq,
};
declare_clippy_lint! {
@ -2803,6 +2803,46 @@ fn lint_iter_skip_next(cx: &LateContext<'_>, expr: &hir::Expr<'_>, skip_args: &[
}
}
pub(crate) fn derefs_to_slice<'tcx>(
cx: &LateContext<'tcx>,
expr: &'tcx hir::Expr<'tcx>,
ty: Ty<'tcx>,
) -> Option<&'tcx hir::Expr<'tcx>> {
fn may_slice<'a>(cx: &LateContext<'a>, ty: Ty<'a>) -> bool {
match ty.kind() {
ty::Slice(_) => true,
ty::Adt(def, _) if def.is_box() => may_slice(cx, ty.boxed_ty()),
ty::Adt(..) => is_type_diagnostic_item(cx, ty, sym::vec_type),
ty::Array(_, size) => size
.try_eval_usize(cx.tcx, cx.param_env)
.map_or(false, |size| size < 32),
ty::Ref(_, inner, _) => may_slice(cx, inner),
_ => false,
}
}
if let hir::ExprKind::MethodCall(ref path, _, ref args, _) = expr.kind {
if path.ident.name == sym::iter && may_slice(cx, cx.typeck_results().expr_ty(&args[0])) {
Some(&args[0])
} else {
None
}
} else {
match ty.kind() {
ty::Slice(_) => Some(expr),
ty::Adt(def, _) if def.is_box() && may_slice(cx, ty.boxed_ty()) => Some(expr),
ty::Ref(_, inner, _) => {
if may_slice(cx, inner) {
Some(expr)
} else {
None
}
},
_ => None,
}
}
}
/// lint use of `unwrap()` for `Option`s and `Result`s
fn lint_unwrap(cx: &LateContext<'_>, expr: &hir::Expr<'_>, unwrap_args: &[hir::Expr<'_>]) {
let obj_ty = cx.typeck_results().expr_ty(&unwrap_args[0]).peel_refs();

40
clippy_utils/src/lib.rs
View file

@ -1802,46 +1802,6 @@ pub fn is_some_ctor(cx: &LateContext<'_>, res: Res) -> bool {
false
}
pub fn derefs_to_slice<'tcx>(
cx: &LateContext<'tcx>,
expr: &'tcx hir::Expr<'tcx>,
ty: Ty<'tcx>,
) -> Option<&'tcx hir::Expr<'tcx>> {
fn may_slice<'a>(cx: &LateContext<'a>, ty: Ty<'a>) -> bool {
match ty.kind() {
ty::Slice(_) => true,
ty::Adt(def, _) if def.is_box() => may_slice(cx, ty.boxed_ty()),
ty::Adt(..) => is_type_diagnostic_item(cx, ty, sym::vec_type),
ty::Array(_, size) => size
.try_eval_usize(cx.tcx, cx.param_env)
.map_or(false, |size| size < 32),
ty::Ref(_, inner, _) => may_slice(cx, inner),
_ => false,
}
}
if let hir::ExprKind::MethodCall(ref path, _, ref args, _) = expr.kind {
if path.ident.name == sym::iter && may_slice(cx, cx.typeck_results().expr_ty(&args[0])) {
Some(&args[0])
} else {
None
}
} else {
match ty.kind() {
ty::Slice(_) => Some(expr),
ty::Adt(def, _) if def.is_box() && may_slice(cx, ty.boxed_ty()) => Some(expr),
ty::Ref(_, inner, _) => {
if may_slice(cx, inner) {
Some(expr)
} else {
None
}
},
_ => None,
}
}
}
#[cfg(test)]
mod test {
use super::{reindent_multiline, without_block_comments};