use clippy_utils::diagnostics::span_lint_and_sugg;
-use clippy_utils::higher;
use clippy_utils::sugg::Sugg;
use clippy_utils::ty::is_type_diagnostic_item;
use clippy_utils::{
- can_move_expr_to_closure, eager_or_lazy, in_constant, is_else_clause, is_lang_ctor, peel_hir_expr_while,
- CaptureKind,
+ can_move_expr_to_closure, eager_or_lazy, higher, in_constant, is_else_clause, is_lang_ctor, peel_blocks,
+ peel_hir_expr_while, CaptureKind,
};
use if_chain::if_chain;
use rustc_errors::Applicability;
use rustc_hir::LangItem::OptionSome;
-use rustc_hir::{def::Res, BindingAnnotation, Block, Expr, ExprKind, Mutability, PatKind, Path, QPath, UnOp};
+use rustc_hir::{def::Res, BindingAnnotation, Expr, ExprKind, Mutability, PatKind, Path, QPath, UnOp};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
use rustc_span::sym;
/// y*y
/// }, |foo| foo);
/// ```
+ #[clippy::version = "1.47.0"]
pub OPTION_IF_LET_ELSE,
nursery,
"reimplementation of Option::map_or"
/// Returns true iff the given expression is the result of calling `Result::ok`
fn is_result_ok(cx: &LateContext<'_>, expr: &'_ Expr<'_>) -> bool {
- if let ExprKind::MethodCall(path, _, &[ref receiver], _) = &expr.kind {
+ if let ExprKind::MethodCall(path, &[ref receiver], _) = &expr.kind {
path.ident.name.as_str() == "ok"
&& is_type_diagnostic_item(cx, cx.typeck_results().expr_ty(receiver), sym::Result)
} else {
none_expr: String,
}
-/// Extracts the body of a given arm. If the arm contains only an expression,
-/// then it returns the expression. Otherwise, it returns the entire block
-fn extract_body_from_expr<'a>(expr: &'a Expr<'a>) -> Option<&'a Expr<'a>> {
- if let ExprKind::Block(
- Block {
- stmts: block_stmts,
- expr: Some(block_expr),
- ..
- },
- _,
- ) = expr.kind
- {
- if let [] = block_stmts {
- Some(block_expr)
- } else {
- Some(expr)
- }
- } else {
- None
- }
-}
-
fn format_option_in_sugg(cx: &LateContext<'_>, cond_expr: &Expr<'_>, as_ref: bool, as_mut: bool) -> String {
format!(
"{}{}",
- Sugg::hir(cx, cond_expr, "..").maybe_par(),
+ Sugg::hir_with_macro_callsite(cx, cond_expr, "..").maybe_par(),
if as_mut {
".as_mut()"
} else if as_ref {
if !is_result_ok(cx, let_expr); // Don't lint on Result::ok because a different lint does it already
if let PatKind::TupleStruct(struct_qpath, [inner_pat], _) = &let_pat.kind;
if is_lang_ctor(cx, struct_qpath, OptionSome);
- if let PatKind::Binding(bind_annotation, _, id, _) = &inner_pat.kind;
+ if let PatKind::Binding(bind_annotation, _, id, None) = &inner_pat.kind;
if let Some(some_captures) = can_move_expr_to_closure(cx, if_then);
if let Some(none_captures) = can_move_expr_to_closure(cx, if_else);
if some_captures
then {
let capture_mut = if bind_annotation == &BindingAnnotation::Mutable { "mut " } else { "" };
- let some_body = extract_body_from_expr(if_then)?;
- let none_body = extract_body_from_expr(if_else)?;
- let method_sugg = if eager_or_lazy::is_eagerness_candidate(cx, none_body) {
- "map_or"
- } else {
- "map_or_else"
- };
+ let some_body = peel_blocks(if_then);
+ let none_body = peel_blocks(if_else);
+ let method_sugg = if eager_or_lazy::switch_to_eager_eval(cx, none_body) { "map_or" } else { "map_or_else" };
let capture_name = id.name.to_ident_string();
let (as_ref, as_mut) = match &let_expr.kind {
ExprKind::AddrOf(_, Mutability::Not, _) => (true, false),
Some(OptionIfLetElseOccurence {
option: format_option_in_sugg(cx, cond_expr, as_ref, as_mut),
method_sugg: method_sugg.to_string(),
- some_expr: format!("|{}{}| {}", capture_mut, capture_name, Sugg::hir(cx, some_body, "..")),
- none_expr: format!("{}{}", if method_sugg == "map_or" { "" } else { "|| " }, Sugg::hir(cx, none_body, "..")),
+ some_expr: format!("|{}{}| {}", capture_mut, capture_name, Sugg::hir_with_macro_callsite(cx, some_body, "..")),
+ none_expr: format!("{}{}", if method_sugg == "map_or" { "" } else { "|| " }, Sugg::hir_with_macro_callsite(cx, none_body, "..")),
})
} else {
None