Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/ide-assists/src/handlers/convert_closure_to_fn.rs')
| -rw-r--r-- | crates/ide-assists/src/handlers/convert_closure_to_fn.rs | 1271 |
1 files changed, 1271 insertions, 0 deletions
diff --git a/crates/ide-assists/src/handlers/convert_closure_to_fn.rs b/crates/ide-assists/src/handlers/convert_closure_to_fn.rs new file mode 100644 index 0000000000..79f303b37a --- /dev/null +++ b/crates/ide-assists/src/handlers/convert_closure_to_fn.rs @@ -0,0 +1,1271 @@ +use either::Either; +use hir::{CaptureKind, ClosureCapture, FileRangeWrapper, HirDisplay}; +use ide_db::{ + assists::{AssistId, AssistKind}, + base_db::SourceDatabase, + defs::Definition, + search::FileReferenceNode, + source_change::SourceChangeBuilder, + FxHashSet, +}; +use stdx::format_to; +use syntax::{ + algo::{skip_trivia_token, skip_whitespace_token}, + ast::{ + self, + edit::{AstNodeEdit, IndentLevel}, + make, HasArgList, HasGenericParams, HasName, + }, + hacks::parse_expr_from_str, + ted, AstNode, Direction, SyntaxKind, SyntaxNode, TextSize, ToSmolStr, T, +}; + +use crate::assist_context::{AssistContext, Assists}; + +// Assist: convert_closure_to_fn +// +// This converts a closure to a freestanding function, changing all captures to parameters. +// +// ``` +// # //- minicore: copy +// # struct String; +// # impl String { +// # fn new() -> Self {} +// # fn push_str(&mut self, s: &str) {} +// # } +// fn main() { +// let mut s = String::new(); +// let closure = |$0a| s.push_str(a); +// closure("abc"); +// } +// ``` +// -> +// ``` +// # struct String; +// # impl String { +// # fn new() -> Self {} +// # fn push_str(&mut self, s: &str) {} +// # } +// fn main() { +// let mut s = String::new(); +// fn closure(a: &str, s: &mut String) { +// s.push_str(a) +// } +// closure("abc", &mut s); +// } +// ``` +pub(crate) fn convert_closure_to_fn(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> { + let closure = ctx.find_node_at_offset::<ast::ClosureExpr>()?; + if ctx.find_node_at_offset::<ast::Expr>() != Some(ast::Expr::ClosureExpr(closure.clone())) { + // Not inside the parameter list. + return None; + } + let closure_name = closure.syntax().parent().and_then(|parent| { + let closure_decl = ast::LetStmt::cast(parent)?; + match closure_decl.pat()? { + ast::Pat::IdentPat(pat) => Some((closure_decl, pat.clone(), pat.name()?)), + _ => None, + } + }); + let module = ctx.sema.scope(closure.syntax())?.module(); + let closure_ty = ctx.sema.type_of_expr(&closure.clone().into())?; + let callable = closure_ty.original.as_callable(ctx.db())?; + let closure_ty = closure_ty.original.as_closure()?; + + let mut ret_ty = callable.return_type(); + let mut closure_mentioned_generic_params = ret_ty.generic_params(ctx.db()); + + let mut params = callable + .params() + .into_iter() + .map(|param| { + let node = ctx.sema.source(param.clone())?.value.right()?; + let param_ty = param.ty(); + closure_mentioned_generic_params.extend(param_ty.generic_params(ctx.db())); + match node.ty() { + Some(_) => Some(node), + None => { + let ty = param_ty + .display_source_code(ctx.db(), module.into(), true) + .unwrap_or_else(|_| "_".to_owned()); + Some(make::param(node.pat()?, make::ty(&ty))) + } + } + }) + .collect::<Option<Vec<_>>>()?; + + let mut body = closure.body()?.clone_for_update(); + let mut is_gen = false; + let mut is_async = closure.async_token().is_some(); + if is_async { + ret_ty = ret_ty.future_output(ctx.db())?; + } + // We defer the wrapping of the body in the block, because `make::block()` will generate a new node, + // but we need to locate `AstPtr`s inside the body. + let mut wrap_body_in_block = true; + if let ast::Expr::BlockExpr(block) = &body { + if let Some(async_token) = block.async_token() { + if !is_async { + is_async = true; + ret_ty = ret_ty.future_output(ctx.db())?; + let token_idx = async_token.index(); + let whitespace_tokens_after_count = async_token + .siblings_with_tokens(Direction::Next) + .skip(1) + .take_while(|token| token.kind() == SyntaxKind::WHITESPACE) + .count(); + body.syntax().splice_children( + token_idx..token_idx + whitespace_tokens_after_count + 1, + Vec::new(), + ); + } + } + if let Some(gen_token) = block.gen_token() { + is_gen = true; + ret_ty = ret_ty.iterator_item(ctx.db())?; + let token_idx = gen_token.index(); + let whitespace_tokens_after_count = gen_token + .siblings_with_tokens(Direction::Next) + .skip(1) + .take_while(|token| token.kind() == SyntaxKind::WHITESPACE) + .count(); + body.syntax().splice_children( + token_idx..token_idx + whitespace_tokens_after_count + 1, + Vec::new(), + ); + } + + if block.try_token().is_none() + && block.unsafe_token().is_none() + && block.label().is_none() + && block.const_token().is_none() + && block.async_token().is_none() + { + wrap_body_in_block = false; + } + }; + + acc.add( + AssistId("convert_closure_to_fn", AssistKind::RefactorRewrite), + "Convert closure to fn", + closure.param_list()?.syntax().text_range(), + |builder| { + let closure_name_or_default = closure_name + .as_ref() + .map(|(_, _, it)| it.clone()) + .unwrap_or_else(|| make::name("fun_name")); + let captures = closure_ty.captured_items(ctx.db()); + let capture_tys = closure_ty.capture_types(ctx.db()); + + let mut captures_as_args = Vec::with_capacity(captures.len()); + + let body_root = body.syntax().ancestors().last().unwrap(); + // We need to defer this work because otherwise the text range of elements is being messed up, and + // replacements for the next captures won't work. + let mut capture_usages_replacement_map = Vec::with_capacity(captures.len()); + + for (capture, capture_ty) in std::iter::zip(&captures, &capture_tys) { + // FIXME: Allow configuring the replacement of `self`. + let capture_name = + if capture.local().is_self(ctx.db()) && !capture.has_field_projections() { + make::name("this") + } else { + make::name(&capture.place_to_name(ctx.db())) + }; + + closure_mentioned_generic_params.extend(capture_ty.generic_params(ctx.db())); + + let capture_ty = capture_ty + .display_source_code(ctx.db(), module.into(), true) + .unwrap_or_else(|_| "_".to_owned()); + params.push(make::param( + ast::Pat::IdentPat(make::ident_pat(false, false, capture_name.clone_subtree())), + make::ty(&capture_ty), + )); + + for capture_usage in capture.usages().sources(ctx.db()) { + if capture_usage.file_id() != ctx.file_id() { + // This is from a macro, don't change it. + continue; + } + + let capture_usage_source = capture_usage.source(); + let capture_usage_source = capture_usage_source.to_node(&body_root); + let expr = match capture_usage_source { + Either::Left(expr) => expr, + Either::Right(pat) => { + let Some(expr) = expr_of_pat(pat) else { continue }; + expr + } + }; + let replacement = wrap_capture_in_deref_if_needed( + &expr, + &capture_name, + capture.kind(), + capture_usage.is_ref(), + ) + .clone_for_update(); + capture_usages_replacement_map.push((expr, replacement)); + } + + captures_as_args.push(capture_as_arg(ctx, capture)); + } + + let (closure_type_params, closure_where_clause) = + compute_closure_type_params(ctx, closure_mentioned_generic_params, &closure); + + for (old, new) in capture_usages_replacement_map { + if old == body { + body = new; + } else { + ted::replace(old.syntax(), new.syntax()); + } + } + + let body = if wrap_body_in_block { + make::block_expr([], Some(body)) + } else { + ast::BlockExpr::cast(body.syntax().clone()).unwrap() + }; + + let params = make::param_list(None, params); + let ret_ty = if ret_ty.is_unit() { + None + } else { + let ret_ty = ret_ty + .display_source_code(ctx.db(), module.into(), true) + .unwrap_or_else(|_| "_".to_owned()); + Some(make::ret_type(make::ty(&ret_ty))) + }; + let mut fn_ = make::fn_( + None, + closure_name_or_default.clone(), + closure_type_params, + closure_where_clause, + params, + body, + ret_ty, + is_async, + false, + false, + is_gen, + ); + fn_ = fn_.dedent(IndentLevel::from_token(&fn_.syntax().last_token().unwrap())); + + builder.edit_file(ctx.file_id()); + match &closure_name { + Some((closure_decl, _, _)) => { + fn_ = fn_.indent(closure_decl.indent_level()); + builder.replace(closure_decl.syntax().text_range(), fn_.to_string()); + } + None => { + let Some(top_stmt) = + closure.syntax().ancestors().skip(1).find_map(|ancestor| { + ast::Stmt::cast(ancestor.clone()).map(Either::Left).or_else(|| { + ast::ClosureExpr::cast(ancestor.clone()) + .map(Either::Left) + .or_else(|| ast::BlockExpr::cast(ancestor).map(Either::Right)) + .map(Either::Right) + }) + }) + else { + return; + }; + builder.replace( + closure.syntax().text_range(), + closure_name_or_default.to_string(), + ); + match top_stmt { + Either::Left(stmt) => { + let indent = stmt.indent_level(); + fn_ = fn_.indent(indent); + let range = stmt + .syntax() + .first_token() + .and_then(|token| { + skip_whitespace_token(token.prev_token()?, Direction::Prev) + }) + .map(|it| it.text_range().end()) + .unwrap_or_else(|| stmt.syntax().text_range().start()); + builder.insert(range, format!("\n{indent}{fn_}")); + } + Either::Right(Either::Left(closure_inside_closure)) => { + let Some(closure_body) = closure_inside_closure.body() else { return }; + // FIXME: Maybe we can indent this properly, adding newlines and all, but this is hard. + builder.insert( + closure_body.syntax().text_range().start(), + format!("{{ {fn_} "), + ); + builder + .insert(closure_body.syntax().text_range().end(), " }".to_owned()); + } + Either::Right(Either::Right(block_expr)) => { + let Some(tail_expr) = block_expr.tail_expr() else { return }; + let Some(insert_in) = + tail_expr.syntax().first_token().and_then(|token| { + skip_whitespace_token(token.prev_token()?, Direction::Prev) + }) + else { + return; + }; + let indent = tail_expr.indent_level(); + fn_ = fn_.indent(indent); + builder + .insert(insert_in.text_range().end(), format!("\n{indent}{fn_}")); + } + } + } + } + + handle_calls( + builder, + ctx, + closure_name.as_ref().map(|(_, it, _)| it), + &captures_as_args, + &closure, + ); + + // FIXME: Place the cursor at `fun_name`, like rename does. + }, + )?; + Some(()) +} + +fn compute_closure_type_params( + ctx: &AssistContext<'_>, + mentioned_generic_params: FxHashSet<hir::GenericParam>, + closure: &ast::ClosureExpr, +) -> (Option<ast::GenericParamList>, Option<ast::WhereClause>) { + if mentioned_generic_params.is_empty() { + return (None, None); + } + + let mut mentioned_names = mentioned_generic_params + .iter() + .filter_map(|param| match param { + hir::GenericParam::TypeParam(param) => { + Some(param.name(ctx.db()).unescaped().display(ctx.db()).to_smolstr()) + } + hir::GenericParam::ConstParam(param) => { + Some(param.name(ctx.db()).unescaped().display(ctx.db()).to_smolstr()) + } + hir::GenericParam::LifetimeParam(_) => None, + }) + .collect::<FxHashSet<_>>(); + + let Some((container_params, container_where, container)) = + closure.syntax().ancestors().find_map(ast::AnyHasGenericParams::cast).and_then( + |container| { + Some((container.generic_param_list()?, container.where_clause(), container)) + }, + ) + else { + return (None, None); + }; + let containing_impl = if ast::AssocItem::can_cast(container.syntax().kind()) { + container + .syntax() + .ancestors() + .find_map(ast::Impl::cast) + .and_then(|impl_| Some((impl_.generic_param_list()?, impl_.where_clause()))) + } else { + None + }; + + let all_params = container_params + .type_or_const_params() + .chain(containing_impl.iter().flat_map(|(param_list, _)| param_list.type_or_const_params())) + .filter_map(|param| Some(param.name()?.text().to_smolstr())) + .collect::<FxHashSet<_>>(); + + // A fixpoint algorithm to detect (very roughly) if we need to include a generic parameter + // by checking if it is mentioned by another parameter we need to include. + let mut reached_fixpoint = false; + let mut container_where_bounds_indices = Vec::new(); + let mut impl_where_bounds_indices = Vec::new(); + while !reached_fixpoint { + reached_fixpoint = true; + + let mut insert_name = |syntax: &SyntaxNode| { + let has_name = syntax + .descendants() + .filter_map(ast::NameOrNameRef::cast) + .any(|name| mentioned_names.contains(&*name.text())); + let mut has_new_params = false; + if has_name { + syntax + .descendants() + .filter_map(ast::NameOrNameRef::cast) + .filter(|name| all_params.contains(name.text().trim_start_matches("r#"))) + .for_each(|name| { + if mentioned_names.insert(name.text().trim_start_matches("r#").to_smolstr()) + { + // We do this here so we don't do it if there are only matches that are not in `all_params`. + has_new_params = true; + reached_fixpoint = false; + } + }); + } + has_new_params + }; + + for param in container_params.type_or_const_params() { + insert_name(param.syntax()); + } + for (pred_index, pred) in container_where.iter().flat_map(|it| it.predicates()).enumerate() + { + if insert_name(pred.syntax()) { + container_where_bounds_indices.push(pred_index); + } + } + if let Some((impl_params, impl_where)) = &containing_impl { + for param in impl_params.type_or_const_params() { + insert_name(param.syntax()); + } + for (pred_index, pred) in impl_where.iter().flat_map(|it| it.predicates()).enumerate() { + if insert_name(pred.syntax()) { + impl_where_bounds_indices.push(pred_index); + } + } + } + } + + // Order matters here (for beauty). First the outer impl parameters, then the direct container's. + let include_params = containing_impl + .iter() + .flat_map(|(impl_params, _)| { + impl_params.type_or_const_params().filter(|param| { + param.name().is_some_and(|name| { + mentioned_names.contains(name.text().trim_start_matches("r#")) + }) + }) + }) + .chain(container_params.type_or_const_params().filter(|param| { + param + .name() + .is_some_and(|name| mentioned_names.contains(name.text().trim_start_matches("r#"))) + })) + .map(ast::TypeOrConstParam::into); + let include_where_bounds = containing_impl + .as_ref() + .and_then(|(_, it)| it.as_ref()) + .into_iter() + .flat_map(|where_| { + impl_where_bounds_indices.iter().filter_map(|&index| where_.predicates().nth(index)) + }) + .chain(container_where.iter().flat_map(|where_| { + container_where_bounds_indices + .iter() + .filter_map(|&index| where_.predicates().nth(index)) + })) + .collect::<Vec<_>>(); + let where_clause = + (!include_where_bounds.is_empty()).then(|| make::where_clause(include_where_bounds)); + + // FIXME: Consider generic parameters that do not appear in params/return type/captures but + // written explicitly inside the closure. + (Some(make::generic_param_list(include_params)), where_clause) +} + +fn wrap_capture_in_deref_if_needed( + expr: &ast::Expr, + capture_name: &ast::Name, + capture_kind: CaptureKind, + is_ref: bool, +) -> ast::Expr { + fn peel_parens(mut expr: ast::Expr) -> ast::Expr { + loop { + if ast::ParenExpr::can_cast(expr.syntax().kind()) { + let Some(parent) = expr.syntax().parent().and_then(ast::Expr::cast) else { break }; + expr = parent; + } else { + break; + } + } + expr + } + + let capture_name = make::expr_path(make::path_from_text(&capture_name.text())); + if capture_kind == CaptureKind::Move || is_ref { + return capture_name; + } + let expr_parent = expr.syntax().parent().and_then(ast::Expr::cast); + let expr_parent_peeled_parens = expr_parent.map(peel_parens); + let does_autoderef = match expr_parent_peeled_parens { + Some( + ast::Expr::AwaitExpr(_) + | ast::Expr::CallExpr(_) + | ast::Expr::FieldExpr(_) + | ast::Expr::FormatArgsExpr(_) + | ast::Expr::MethodCallExpr(_), + ) => true, + Some(ast::Expr::IndexExpr(parent_expr)) if parent_expr.base().as_ref() == Some(expr) => { + true + } + _ => false, + }; + if does_autoderef { + return capture_name; + } + make::expr_prefix(T![*], capture_name) +} + +fn capture_as_arg(ctx: &AssistContext<'_>, capture: &ClosureCapture) -> ast::Expr { + let place = + parse_expr_from_str(&capture.display_place_source_code(ctx.db()), ctx.file_id().edition()) + .expect("`display_place_source_code()` produced an invalid expr"); + let needs_mut = match capture.kind() { + CaptureKind::SharedRef => false, + CaptureKind::MutableRef | CaptureKind::UniqueSharedRef => true, + CaptureKind::Move => return place, + }; + if let ast::Expr::PrefixExpr(expr) = &place { + if expr.op_kind() == Some(ast::UnaryOp::Deref) { + return expr.expr().expect("`display_place_source_code()` produced an invalid expr"); + } + } + make::expr_ref(place, needs_mut) +} + +fn handle_calls( + builder: &mut SourceChangeBuilder, + ctx: &AssistContext<'_>, + closure_name: Option<&ast::IdentPat>, + captures_as_args: &[ast::Expr], + closure: &ast::ClosureExpr, +) { + if captures_as_args.is_empty() { + return; + } + + match closure_name { + Some(closure_name) => { + let Some(closure_def) = ctx.sema.to_def(closure_name) else { return }; + let closure_usages = Definition::from(closure_def).usages(&ctx.sema).all(); + for (_, usages) in closure_usages { + for usage in usages { + let name = match usage.name { + FileReferenceNode::Name(name) => name.syntax().clone(), + FileReferenceNode::NameRef(name_ref) => name_ref.syntax().clone(), + FileReferenceNode::FormatStringEntry(..) => continue, + FileReferenceNode::Lifetime(_) => { + unreachable!("impossible usage") + } + }; + let Some(expr) = name.parent().and_then(|it| { + ast::Expr::cast( + ast::PathSegment::cast(it)?.parent_path().syntax().parent()?, + ) + }) else { + continue; + }; + handle_call(builder, ctx, expr, captures_as_args); + } + } + } + None => { + handle_call(builder, ctx, ast::Expr::ClosureExpr(closure.clone()), captures_as_args); + } + } +} + +fn handle_call( + builder: &mut SourceChangeBuilder, + ctx: &AssistContext<'_>, + closure_ref: ast::Expr, + captures_as_args: &[ast::Expr], +) -> Option<()> { + let call = + ast::CallExpr::cast(peel_blocks_and_refs_and_parens(closure_ref).syntax().parent()?)?; + let args = call.arg_list()?; + // The really last token is `)`; we need one before that. + let has_trailing_comma = args.syntax().last_token()?.prev_token().is_some_and(|token| { + skip_trivia_token(token, Direction::Prev).is_some_and(|token| token.kind() == T![,]) + }); + let has_existing_args = args.args().next().is_some(); + + let FileRangeWrapper { file_id, range } = ctx.sema.original_range_opt(args.syntax())?; + let first_arg_indent = args.args().next().map(|it| it.indent_level()); + let arg_list_indent = args.indent_level(); + let insert_newlines = + first_arg_indent.is_some_and(|first_arg_indent| first_arg_indent != arg_list_indent); + let indent = + if insert_newlines { first_arg_indent.unwrap().to_string() } else { String::new() }; + // FIXME: This text manipulation seems risky. + let text = ctx.db().file_text(file_id.file_id()); + let mut text = text[..u32::from(range.end()).try_into().unwrap()].trim_end(); + if !text.ends_with(')') { + return None; + } + text = text[..text.len() - 1].trim_end(); + let offset = TextSize::new(text.len().try_into().unwrap()); + + let mut to_insert = String::new(); + if has_existing_args && !has_trailing_comma { + to_insert.push(','); + } + if insert_newlines { + to_insert.push('\n'); + } + let (last_arg, rest_args) = + captures_as_args.split_last().expect("already checked has captures"); + if !insert_newlines && has_existing_args { + to_insert.push(' '); + } + if let Some((first_arg, rest_args)) = rest_args.split_first() { + format_to!(to_insert, "{indent}{first_arg},",); + if insert_newlines { + to_insert.push('\n'); + } + for new_arg in rest_args { + if !insert_newlines { + to_insert.push(' '); + } + format_to!(to_insert, "{indent}{new_arg},",); + if insert_newlines { + to_insert.push('\n'); + } + } + if !insert_newlines { + to_insert.push(' '); + } + } + format_to!(to_insert, "{indent}{last_arg}"); + if has_trailing_comma { + to_insert.push(','); + } + + builder.edit_file(file_id); + builder.insert(offset, to_insert); + + Some(()) +} + +fn peel_blocks_and_refs_and_parens(mut expr: ast::Expr) -> ast::Expr { + loop { + let Some(parent) = expr.syntax().parent() else { break }; + if matches!(parent.kind(), SyntaxKind::PAREN_EXPR | SyntaxKind::REF_EXPR) { + expr = ast::Expr::cast(parent).unwrap(); + continue; + } + if let Some(stmt_list) = ast::StmtList::cast(parent) { + if let Some(block) = stmt_list.syntax().parent().and_then(ast::BlockExpr::cast) { + expr = ast::Expr::BlockExpr(block); + continue; + } + } + break; + } + expr +} + +// FIXME: +// Somehow handle the case of `let Struct { field, .. } = capture`. +// Replacing `capture` with `capture_field` won't work. +fn expr_of_pat(pat: ast::Pat) -> Option<ast::Expr> { + 'find_expr: { + for ancestor in pat.syntax().ancestors() { + if let Some(let_stmt) = ast::LetStmt::cast(ancestor.clone()) { + break 'find_expr let_stmt.initializer(); + } + if ast::MatchArm::can_cast(ancestor.kind()) { + if let Some(match_) = + ancestor.parent().and_then(|it| it.parent()).and_then(ast::MatchExpr::cast) + { + break 'find_expr match_.expr(); + } + } + if ast::ExprStmt::can_cast(ancestor.kind()) { + break; + } + } + None + } +} + +#[cfg(test)] +mod tests { + use crate::tests::{check_assist, check_assist_not_applicable}; + + use super::*; + + #[test] + fn handles_unique_captures() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore:copy +fn main() { + let s = &mut true; + let closure = |$0| { *s = false; }; + closure(); +} +"#, + r#" +fn main() { + let s = &mut true; + fn closure(s: &mut bool) { *s = false; } + closure(s); +} +"#, + ); + } + + #[test] + fn multiple_capture_usages() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore:copy +struct A { a: i32, b: bool } +fn main() { + let mut a = A { a: 123, b: false }; + let closure = |$0| { + let b = a.b; + a = A { a: 456, b: true }; + }; + closure(); +} +"#, + r#" +struct A { a: i32, b: bool } +fn main() { + let mut a = A { a: 123, b: false }; + fn closure(a: &mut A) { + let b = a.b; + *a = A { a: 456, b: true }; + } + closure(&mut a); +} +"#, + ); + } + + #[test] + fn changes_names_of_place() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore:copy +struct A { b: &'static B, c: i32 } +struct B(bool, i32); +struct C; +impl C { + fn foo(&self) { + let a = A { b: &B(false, 0), c: 123 }; + let closure = |$0| { + let b = a.b.1; + let c = &*self; + }; + closure(); + } +} +"#, + r#" +struct A { b: &'static B, c: i32 } +struct B(bool, i32); +struct C; +impl C { + fn foo(&self) { + let a = A { b: &B(false, 0), c: 123 }; + fn closure(this: &C, a_b_1: &i32) { + let b = *a_b_1; + let c = this; + } + closure(self, &a.b.1); + } +} +"#, + ); + } + + #[test] + fn self_with_fields_does_not_change_to_this() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore:copy +struct A { b: &'static B, c: i32 } +struct B(bool, i32); +impl A { + fn foo(&self) { + let closure = |$0| { + let b = self.b.1; + }; + closure(); + } +} +"#, + r#" +struct A { b: &'static B, c: i32 } +struct B(bool, i32); +impl A { + fn foo(&self) { + fn closure(self_b_1: &i32) { + let b = *self_b_1; + } + closure(&self.b.1); + } +} +"#, + ); + } + + #[test] + fn replaces_async_closure_with_async_fn() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy, future +fn foo(&self) { + let closure = async |$0| 1; + closure(); +} +"#, + r#" +fn foo(&self) { + async fn closure() -> i32 { + 1 + } + closure(); +} +"#, + ); + } + + #[test] + fn replaces_async_block_with_async_fn() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy, future +fn foo() { + let closure = |$0| async { 1 }; + closure(); +} +"#, + r#" +fn foo() { + async fn closure() -> i32 { 1 } + closure(); +} +"#, + ); + } + + #[test] + #[ignore = "FIXME: we do not do type inference for gen blocks yet"] + fn replaces_gen_block_with_gen_fn() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy, iterator +//- /lib.rs edition:2024 +fn foo() { + let closure = |$0| gen { + yield 1; + }; + closure(); +} +"#, + r#" +fn foo() { + gen fn closure() -> i32 { + yield 1; + } + closure(); +} +"#, + ); + } + + #[test] + fn leaves_block_in_place() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn foo() { + let closure = |$0| {}; + closure(); +} +"#, + r#" +fn foo() { + fn closure() {} + closure(); +} +"#, + ); + } + + #[test] + fn wraps_in_block_if_needed() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn foo() { + let a = 1; + let closure = |$0| a; + closure(); +} +"#, + r#" +fn foo() { + let a = 1; + fn closure(a: &i32) -> i32 { + *a + } + closure(&a); +} +"#, + ); + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn foo() { + let closure = |$0| 'label: {}; + closure(); +} +"#, + r#" +fn foo() { + fn closure() { + 'label: {} + } + closure(); +} +"#, + ); + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn foo() { + let closure = |$0| { + const { () } + }; + closure(); +} +"#, + r#" +fn foo() { + fn closure() { + const { () } + } + closure(); +} +"#, + ); + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn foo() { + let closure = |$0| unsafe { }; + closure(); +} +"#, + r#" +fn foo() { + fn closure() { + unsafe { } + } + closure(); +} +"#, + ); + } + + #[test] + fn closure_in_closure() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn foo() { + let a = 1; + || |$0| { let b = &a; }; +} +"#, + r#" +fn foo() { + let a = 1; + || { fn fun_name(a: &i32) { let b = a; } fun_name }; +} +"#, + ); + } + + #[test] + fn closure_in_block() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn foo() { + { + let a = 1; + |$0| { let b = &a; } + }; +} +"#, + r#" +fn foo() { + { + let a = 1; + fn fun_name(a: &i32) { let b = a; } + fun_name + }; +} +"#, + ); + } + + #[test] + fn finds_pat_for_expr() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +struct A { b: B } +struct B(bool, i32); +fn foo() { + let mut a = A { b: B(true, 0) }; + let closure = |$0| { + let A { b: B(_, ref mut c) } = a; + }; + closure(); +} +"#, + r#" +struct A { b: B } +struct B(bool, i32); +fn foo() { + let mut a = A { b: B(true, 0) }; + fn closure(a_b_1: &mut i32) { + let A { b: B(_, ref mut c) } = a_b_1; + } + closure(&mut a.b.1); +} +"#, + ); + } + + #[test] + fn with_existing_params() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn foo() { + let (mut a, b) = (0.1, "abc"); + let closure = |$0p1: i32, p2: &mut bool| { + a = 1.2; + let c = b; + }; + closure(0, &mut false); +} +"#, + r#" +fn foo() { + let (mut a, b) = (0.1, "abc"); + fn closure(p1: i32, p2: &mut bool, a: &mut f64, b: &&str) { + *a = 1.2; + let c = *b; + } + closure(0, &mut false, &mut a, &b); +} +"#, + ); + } + + #[test] + fn with_existing_params_newlines() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn foo() { + let (mut a, b) = (0.1, "abc"); + let closure = |$0p1: i32, p2| { + let _: &mut bool = p2; + a = 1.2; + let c = b; + }; + closure( + 0, + &mut false + ); +} +"#, + r#" +fn foo() { + let (mut a, b) = (0.1, "abc"); + fn closure(p1: i32, p2: &mut bool, a: &mut f64, b: &&str) { + let _: &mut bool = p2; + *a = 1.2; + let c = *b; + } + closure( + 0, + &mut false, + &mut a, + &b + ); +} +"#, + ); + } + + #[test] + fn with_existing_params_trailing_comma() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn foo() { + let (mut a, b) = (0.1, "abc"); + let closure = |$0p1: i32, p2| { + let _: &mut bool = p2; + a = 1.2; + let c = b; + }; + closure( + 0, + &mut false, + ); +} +"#, + r#" +fn foo() { + let (mut a, b) = (0.1, "abc"); + fn closure(p1: i32, p2: &mut bool, a: &mut f64, b: &&str) { + let _: &mut bool = p2; + *a = 1.2; + let c = *b; + } + closure( + 0, + &mut false, + &mut a, + &b, + ); +} +"#, + ); + } + + #[test] + fn closure_using_generic_params() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +struct Foo<A, B, const C: usize>(A, B); +impl<A, B: From<A>, const C: usize> Foo<A, B, C> { + fn foo<D, E, F, G>(a: A, b: D) + where + E: From<D>, + { + let closure = |$0c: F| { + let a = B::from(a); + let b = E::from(b); + }; + } +} +"#, + r#" +struct Foo<A, B, const C: usize>(A, B); +impl<A, B: From<A>, const C: usize> Foo<A, B, C> { + fn foo<D, E, F, G>(a: A, b: D) + where + E: From<D>, + { + fn closure<A, B: From<A>, D, E, F>(c: F, a: A, b: D) where E: From<D> { + let a = B::from(a); + let b = E::from(b); + } + } +} +"#, + ); + } + + #[test] + fn closure_in_stmt() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore: copy +fn bar(_: impl FnOnce() -> i32) {} +fn foo() { + let a = 123; + bar(|$0| a); +} +"#, + r#" +fn bar(_: impl FnOnce() -> i32) {} +fn foo() { + let a = 123; + fn fun_name(a: &i32) -> i32 { + *a + } + bar(fun_name); +} +"#, + ); + } + + #[test] + fn unique_and_imm() { + check_assist( + convert_closure_to_fn, + r#" +//- minicore:copy +fn main() { + let a = &mut true; + let closure = |$0| { + let b = &a; + *a = false; + }; + closure(); +} +"#, + r#" +fn main() { + let a = &mut true; + fn closure(a: &mut &mut bool) { + let b = a; + **a = false; + } + closure(&mut a); +} +"#, + ); + } + + #[test] + fn only_applicable_in_param_list() { + check_assist_not_applicable( + convert_closure_to_fn, + r#" +//- minicore:copy +fn main() { + let closure = || { $0 }; +} +"#, + ); + check_assist_not_applicable( + convert_closure_to_fn, + r#" +//- minicore:copy +fn main() { + let $0closure = || { }; +} +"#, + ); + } +} |