From 00124800ea83f8ca0c1955dcf1696215b62ce802 Mon Sep 17 00:00:00 2001 From: Christopher Serr Date: Thu, 19 Sep 2024 22:00:22 +0200 Subject: [PATCH] feat: Highlight exit points of async blocks Async blocks act similar to async functions in that the await keywords are related, but also act like functions where the exit points are related. --- .../crates/ide/src/highlight_related.rs | 164 ++++++++++-------- 1 file changed, 93 insertions(+), 71 deletions(-) diff --git a/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs b/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs index 4c8e3fc3040c2..97b7ba781295b 100644 --- a/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs +++ b/src/tools/rust-analyzer/crates/ide/src/highlight_related.rs @@ -281,99 +281,95 @@ fn highlight_references( } } -// If `file_id` is None, -pub(crate) fn highlight_exit_points( +fn hl_exit_points( sema: &Semantics<'_, RootDatabase>, - token: SyntaxToken, -) -> FxHashMap> { - fn hl( - sema: &Semantics<'_, RootDatabase>, - def_token: Option, - body: ast::Expr, - ) -> Option>> { - let mut highlights: FxHashMap> = FxHashMap::default(); + def_token: Option, + body: ast::Expr, +) -> Option>> { + let mut highlights: FxHashMap> = FxHashMap::default(); + + let mut push_to_highlights = |file_id, range| { + if let Some(FileRange { file_id, range }) = original_frange(sema.db, file_id, range) { + let hrange = HighlightedRange { category: ReferenceCategory::empty(), range }; + highlights.entry(file_id).or_default().insert(hrange); + } + }; - let mut push_to_highlights = |file_id, range| { - if let Some(FileRange { file_id, range }) = original_frange(sema.db, file_id, range) { - let hrange = HighlightedRange { category: ReferenceCategory::empty(), range }; - highlights.entry(file_id).or_default().insert(hrange); + if let Some(tok) = def_token { + let file_id = sema.hir_file_for(&tok.parent()?); + let range = Some(tok.text_range()); + push_to_highlights(file_id, range); + } + + WalkExpandedExprCtx::new(sema).walk(&body, &mut |_, expr| { + let file_id = sema.hir_file_for(expr.syntax()); + + let range = match &expr { + ast::Expr::TryExpr(try_) => try_.question_mark_token().map(|token| token.text_range()), + ast::Expr::MethodCallExpr(_) | ast::Expr::CallExpr(_) | ast::Expr::MacroExpr(_) + if sema.type_of_expr(&expr).map_or(false, |ty| ty.original.is_never()) => + { + Some(expr.syntax().text_range()) } + _ => None, }; - if let Some(tok) = def_token { - let file_id = sema.hir_file_for(&tok.parent()?); - let range = Some(tok.text_range()); - push_to_highlights(file_id, range); - } + push_to_highlights(file_id, range); + }); - WalkExpandedExprCtx::new(sema).walk(&body, &mut |_, expr| { + // We should handle `return` separately, because when it is used in a `try` block, + // it will exit the outside function instead of the block itself. + WalkExpandedExprCtx::new(sema) + .with_check_ctx(&WalkExpandedExprCtx::is_async_const_block_or_closure) + .walk(&body, &mut |_, expr| { let file_id = sema.hir_file_for(expr.syntax()); let range = match &expr { - ast::Expr::TryExpr(try_) => { - try_.question_mark_token().map(|token| token.text_range()) - } - ast::Expr::MethodCallExpr(_) | ast::Expr::CallExpr(_) | ast::Expr::MacroExpr(_) - if sema.type_of_expr(&expr).map_or(false, |ty| ty.original.is_never()) => - { - Some(expr.syntax().text_range()) - } + ast::Expr::ReturnExpr(expr) => expr.return_token().map(|token| token.text_range()), _ => None, }; push_to_highlights(file_id, range); }); - // We should handle `return` separately, because when it is used in a `try` block, - // it will exit the outside function instead of the block itself. - WalkExpandedExprCtx::new(sema) - .with_check_ctx(&WalkExpandedExprCtx::is_async_const_block_or_closure) - .walk(&body, &mut |_, expr| { - let file_id = sema.hir_file_for(expr.syntax()); - - let range = match &expr { - ast::Expr::ReturnExpr(expr) => { - expr.return_token().map(|token| token.text_range()) - } - _ => None, - }; - - push_to_highlights(file_id, range); - }); - - let tail = match body { - ast::Expr::BlockExpr(b) => b.tail_expr(), - e => Some(e), - }; + let tail = match body { + ast::Expr::BlockExpr(b) => b.tail_expr(), + e => Some(e), + }; - if let Some(tail) = tail { - for_each_tail_expr(&tail, &mut |tail| { - let file_id = sema.hir_file_for(tail.syntax()); - let range = match tail { - ast::Expr::BreakExpr(b) => b - .break_token() - .map_or_else(|| tail.syntax().text_range(), |tok| tok.text_range()), - _ => tail.syntax().text_range(), - }; - push_to_highlights(file_id, Some(range)); - }); - } - Some(highlights) + if let Some(tail) = tail { + for_each_tail_expr(&tail, &mut |tail| { + let file_id = sema.hir_file_for(tail.syntax()); + let range = match tail { + ast::Expr::BreakExpr(b) => b + .break_token() + .map_or_else(|| tail.syntax().text_range(), |tok| tok.text_range()), + _ => tail.syntax().text_range(), + }; + push_to_highlights(file_id, Some(range)); + }); } + Some(highlights) +} +// If `file_id` is None, +pub(crate) fn highlight_exit_points( + sema: &Semantics<'_, RootDatabase>, + token: SyntaxToken, +) -> FxHashMap> { let mut res = FxHashMap::default(); for def in goto_definition::find_fn_or_blocks(sema, &token) { let new_map = match_ast! { match def { - ast::Fn(fn_) => fn_.body().and_then(|body| hl(sema, fn_.fn_token(), body.into())), + ast::Fn(fn_) => fn_.body().and_then(|body| hl_exit_points(sema, fn_.fn_token(), body.into())), ast::ClosureExpr(closure) => { let pipe_tok = closure.param_list().and_then(|p| p.pipe_token()); - closure.body().and_then(|body| hl(sema, pipe_tok, body)) + closure.body().and_then(|body| hl_exit_points(sema, pipe_tok, body)) }, ast::BlockExpr(blk) => match blk.modifier() { - Some(ast::BlockModifier::Async(t)) => hl(sema, Some(t), blk.into()), + Some(ast::BlockModifier::Async(t)) => hl_exit_points(sema, Some(t), blk.into()), Some(ast::BlockModifier::Try(t)) if token.kind() != T![return] => { - hl(sema, Some(t), blk.into()) + hl_exit_points(sema, Some(t), blk.into()) }, _ => continue, }, @@ -520,6 +516,12 @@ pub(crate) fn highlight_yield_points( if block_expr.async_token().is_none() { continue; } + + // Async blocks act similar to closures. So we want to + // highlight their exit points too. + let exit_points = hl_exit_points(sema, block_expr.async_token(), block_expr.clone().into()); + merge_map(&mut res, exit_points); + hl(sema, block_expr.async_token(), Some(block_expr.into())) }, ast::ClosureExpr(closure) => hl(sema, closure.async_token(), closure.body()), @@ -876,6 +878,27 @@ pub async$0 fn foo() { ); } + #[test] + fn test_hl_exit_points_of_async_blocks() { + check( + r#" +pub fn foo() { + let x = async$0 { + // ^^^^^ + 0.await; + // ^^^^^ + 0?; + // ^ + return 0; + // ^^^^^^ + 0 + // ^ + }; +} +"#, + ); + } + #[test] fn test_hl_let_else_yield_points() { check( @@ -925,11 +948,10 @@ async fn foo() { async fn foo() { (async { // ^^^^^ - (async { - 0.await - }).await$0 } - // ^^^^^ - ).await; + (async { 0.await }).await$0 + // ^^^^^^^^^^^^^^^^^^^^^^^^^ + // ^^^^^ + }).await; } "#, );