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Also handle deref expressions in "Extract variable"
And BTW, remove the parentheses of the extracted expression if there are.
| -rw-r--r-- | crates/ide-assists/src/handlers/extract_variable.rs | 72 | ||||
| -rw-r--r-- | crates/ide-assists/src/tests/generated.rs | 2 |
2 files changed, 59 insertions, 15 deletions
diff --git a/crates/ide-assists/src/handlers/extract_variable.rs b/crates/ide-assists/src/handlers/extract_variable.rs index e6d1662e68..5ae75bb1ff 100644 --- a/crates/ide-assists/src/handlers/extract_variable.rs +++ b/crates/ide-assists/src/handlers/extract_variable.rs @@ -20,7 +20,7 @@ use crate::{utils::suggest_name, AssistContext, AssistId, AssistKind, Assists}; // -> // ``` // fn main() { -// let $0var_name = (1 + 2); +// let $0var_name = 1 + 2; // var_name * 4; // } // ``` @@ -59,7 +59,7 @@ pub(crate) fn extract_variable(acc: &mut Assists, ctx: &AssistContext<'_>) -> Op let parent = to_extract.syntax().parent().and_then(ast::Expr::cast); // Any expression that autoderefs may need adjustment. - let needs_adjust = parent.as_ref().map_or(false, |it| match it { + let mut needs_adjust = parent.as_ref().map_or(false, |it| match it { ast::Expr::FieldExpr(_) | ast::Expr::MethodCallExpr(_) | ast::Expr::CallExpr(_) @@ -67,15 +67,21 @@ pub(crate) fn extract_variable(acc: &mut Assists, ctx: &AssistContext<'_>) -> Op ast::Expr::IndexExpr(index) if index.base().as_ref() == Some(&to_extract) => true, _ => false, }); + let mut to_extract_no_ref = peel_parens(to_extract.clone()); let needs_ref = needs_adjust - && matches!( - to_extract, + && match &to_extract_no_ref { ast::Expr::FieldExpr(_) - | ast::Expr::IndexExpr(_) - | ast::Expr::MacroExpr(_) - | ast::Expr::ParenExpr(_) - | ast::Expr::PathExpr(_) - ); + | ast::Expr::IndexExpr(_) + | ast::Expr::MacroExpr(_) + | ast::Expr::ParenExpr(_) + | ast::Expr::PathExpr(_) => true, + ast::Expr::PrefixExpr(prefix) if prefix.op_kind() == Some(ast::UnaryOp::Deref) => { + to_extract_no_ref = prefix.expr()?; + needs_adjust = false; + false + } + _ => false, + }; let anchor = Anchor::from(&to_extract)?; let target = to_extract.syntax().text_range(); @@ -111,19 +117,19 @@ pub(crate) fn extract_variable(acc: &mut Assists, ctx: &AssistContext<'_>) -> Op _ => make::ident_pat(false, false, make::name(&var_name)), }; - let to_extract = match ty.as_ref().filter(|_| needs_ref) { + let to_extract_no_ref = match ty.as_ref().filter(|_| needs_ref) { Some(receiver_type) if receiver_type.is_mutable_reference() => { - make::expr_ref(to_extract, true) + make::expr_ref(to_extract_no_ref, true) } Some(receiver_type) if receiver_type.is_reference() => { - make::expr_ref(to_extract, false) + make::expr_ref(to_extract_no_ref, false) } - _ => to_extract, + _ => to_extract_no_ref, }; let expr_replace = edit.make_syntax_mut(expr_replace); let let_stmt = - make::let_stmt(ident_pat.into(), None, Some(to_extract)).clone_for_update(); + make::let_stmt(ident_pat.into(), None, Some(to_extract_no_ref)).clone_for_update(); let name_expr = make::expr_path(make::ext::ident_path(&var_name)).clone_for_update(); match anchor { @@ -223,6 +229,14 @@ pub(crate) fn extract_variable(acc: &mut Assists, ctx: &AssistContext<'_>) -> Op ) } +fn peel_parens(mut expr: ast::Expr) -> ast::Expr { + while let ast::Expr::ParenExpr(parens) = &expr { + let Some(expr_inside) = parens.expr() else { break }; + expr = expr_inside; + } + expr +} + /// Check whether the node is a valid expression which can be extracted to a variable. /// In general that's true for any expression, but in some cases that would produce invalid code. fn valid_target_expr(node: SyntaxNode) -> Option<ast::Expr> { @@ -1547,4 +1561,34 @@ fn foo() { }"#, ); } + + #[test] + fn generates_no_ref_for_deref() { + check_assist( + extract_variable, + r#" +struct S; +impl S { + fn do_work(&mut self) {} +} +fn bar() -> S { S } +fn foo() { + let v = &mut &mut bar(); + $0(**v)$0.do_work(); +} +"#, + r#" +struct S; +impl S { + fn do_work(&mut self) {} +} +fn bar() -> S { S } +fn foo() { + let v = &mut &mut bar(); + let $0s = *v; + s.do_work(); +} +"#, + ); + } } diff --git a/crates/ide-assists/src/tests/generated.rs b/crates/ide-assists/src/tests/generated.rs index 595ce1affb..0a3242c738 100644 --- a/crates/ide-assists/src/tests/generated.rs +++ b/crates/ide-assists/src/tests/generated.rs @@ -994,7 +994,7 @@ fn main() { "#####, r#####" fn main() { - let $0var_name = (1 + 2); + let $0var_name = 1 + 2; var_name * 4; } "#####, |