diff --git a/crates/ide-assists/src/handlers/remove_dbg.rs b/crates/ide-assists/src/handlers/remove_dbg.rs index 52dd670ec2..1361cdf00c 100644 --- a/crates/ide-assists/src/handlers/remove_dbg.rs +++ b/crates/ide-assists/src/handlers/remove_dbg.rs @@ -1,7 +1,7 @@ use itertools::Itertools; use syntax::{ - ast::{self, AstNode, AstToken}, - match_ast, NodeOrToken, SyntaxElement, TextRange, TextSize, T, + ast::{self, make, AstNode, AstToken}, + match_ast, ted, NodeOrToken, SyntaxElement, TextRange, TextSize, T, }; use crate::{AssistContext, AssistId, AssistKind, Assists}; @@ -12,24 +12,28 @@ use crate::{AssistContext, AssistId, AssistKind, Assists}; // // ``` // fn main() { -// $0dbg!(92); +// let x = $0dbg!(42 * dbg!(4 + 2));$0 // } // ``` // -> // ``` // fn main() { -// 92; +// let x = 42 * (4 + 2); // } // ``` pub(crate) fn remove_dbg(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> { let macro_calls = if ctx.has_empty_selection() { - vec![ctx.find_node_at_offset::()?] + vec![ctx.find_node_at_offset::()?] } else { ctx.covering_element() .as_node()? .descendants() .filter(|node| ctx.selection_trimmed().contains_range(node.text_range())) + // When the selection exactly covers the macro call to be removed, `covering_element()` + // returns `ast::MacroCall` instead of its parent `ast::MacroExpr` that we want. So + // first try finding `ast::MacroCall`s and then retrieve their parent. .filter_map(ast::MacroCall::cast) + .filter_map(|it| it.syntax().parent().and_then(ast::MacroExpr::cast)) .collect() }; @@ -44,14 +48,25 @@ pub(crate) fn remove_dbg(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<( "Remove dbg!()", ctx.selection_trimmed(), |builder| { - for (range, text) in replacements { - builder.replace(range, text); + for (range, expr) in replacements { + if let Some(expr) = expr { + builder.replace(range, expr.to_string()); + } else { + builder.delete(range); + } } }, ) } -fn compute_dbg_replacement(macro_call: ast::MacroCall) -> Option<(TextRange, String)> { +/// Returns `None` when either +/// - macro call is not `dbg!()` +/// - any node inside `dbg!()` could not be parsed as an expression +/// - (`macro_expr` has no parent - is that possible?) +/// +/// Returns `Some(_, None)` when the macro call should just be removed. +fn compute_dbg_replacement(macro_expr: ast::MacroExpr) -> Option<(TextRange, Option)> { + let macro_call = macro_expr.macro_call()?; let tt = macro_call.token_tree()?; let r_delim = NodeOrToken::Token(tt.right_delimiter_token()?); if macro_call.path()?.segment()?.name_ref()?.text() != "dbg" @@ -68,20 +83,19 @@ fn compute_dbg_replacement(macro_call: ast::MacroCall) -> Option<(TextRange, Str .map(|mut tokens| syntax::hacks::parse_expr_from_str(&tokens.join(""))) .collect::>>()?; - let macro_expr = ast::MacroExpr::cast(macro_call.syntax().parent()?)?; let parent = macro_expr.syntax().parent()?; Some(match &*input_expressions { // dbg!() [] => { match_ast! { match parent { - ast::StmtList(__) => { + ast::StmtList(_) => { let range = macro_expr.syntax().text_range(); let range = match whitespace_start(macro_expr.syntax().prev_sibling_or_token()) { Some(start) => range.cover_offset(start), None => range, }; - (range, String::new()) + (range, None) }, ast::ExprStmt(it) => { let range = it.syntax().text_range(); @@ -89,19 +103,23 @@ fn compute_dbg_replacement(macro_call: ast::MacroCall) -> Option<(TextRange, Str Some(start) => range.cover_offset(start), None => range, }; - (range, String::new()) + (range, None) }, - _ => (macro_call.syntax().text_range(), "()".to_owned()) + _ => (macro_call.syntax().text_range(), Some(make::expr_unit())), } } } // dbg!(expr0) [expr] => { + // dbg!(expr, &parent); let wrap = match ast::Expr::cast(parent) { Some(parent) => match (expr, parent) { (ast::Expr::CastExpr(_), ast::Expr::CastExpr(_)) => false, ( - ast::Expr::BoxExpr(_) | ast::Expr::PrefixExpr(_) | ast::Expr::RefExpr(_), + ast::Expr::BoxExpr(_) + | ast::Expr::PrefixExpr(_) + | ast::Expr::RefExpr(_) + | ast::Expr::MacroExpr(_), ast::Expr::AwaitExpr(_) | ast::Expr::CallExpr(_) | ast::Expr::CastExpr(_) @@ -112,7 +130,10 @@ fn compute_dbg_replacement(macro_call: ast::MacroCall) -> Option<(TextRange, Str | ast::Expr::TryExpr(_), ) => true, ( - ast::Expr::BinExpr(_) | ast::Expr::CastExpr(_) | ast::Expr::RangeExpr(_), + ast::Expr::BinExpr(_) + | ast::Expr::CastExpr(_) + | ast::Expr::RangeExpr(_) + | ast::Expr::MacroExpr(_), ast::Expr::AwaitExpr(_) | ast::Expr::BinExpr(_) | ast::Expr::CallExpr(_) @@ -129,16 +150,61 @@ fn compute_dbg_replacement(macro_call: ast::MacroCall) -> Option<(TextRange, Str }, None => false, }; - ( - macro_call.syntax().text_range(), - if wrap { format!("({expr})") } else { expr.to_string() }, - ) + let expr = replace_nested_dbgs(expr.clone()); + let expr = if wrap { make::expr_paren(expr) } else { expr.clone_subtree() }; + (macro_call.syntax().text_range(), Some(expr)) } // dbg!(expr0, expr1, ...) - exprs => (macro_call.syntax().text_range(), format!("({})", exprs.iter().format(", "))), + exprs => { + let exprs = exprs.iter().cloned().map(replace_nested_dbgs); + let expr = make::expr_tuple(exprs); + (macro_call.syntax().text_range(), Some(expr)) + } }) } +fn replace_nested_dbgs(expanded: ast::Expr) -> ast::Expr { + if let ast::Expr::MacroExpr(mac) = &expanded { + // Special-case when `expanded` itself is `dbg!()` since we cannot replace the whole tree + // with `ted`. It should be fairly rare as it means the user wrote `dbg!(dbg!(..))` but you + // never know how code ends up being! + let replaced = if let Some((_, expr_opt)) = compute_dbg_replacement(mac.clone()) { + match expr_opt { + Some(expr) => expr, + None => { + stdx::never!("dbg! inside dbg! should not be just removed"); + expanded + } + } + } else { + expanded + }; + + return replaced; + } + + let expanded = expanded.clone_for_update(); + + // We need to collect to avoid mutation during traversal. + let macro_exprs: Vec<_> = + expanded.syntax().descendants().filter_map(ast::MacroExpr::cast).collect(); + + for mac in macro_exprs { + let expr_opt = match compute_dbg_replacement(mac.clone()) { + Some((_, expr)) => expr, + None => continue, + }; + + if let Some(expr) = expr_opt { + ted::replace(mac.syntax(), expr.syntax().clone_for_update()); + } else { + ted::remove(mac.syntax()); + } + } + + expanded +} + fn whitespace_start(it: Option) -> Option { Some(it?.into_token().and_then(ast::Whitespace::cast)?.syntax().text_range().start()) } @@ -287,4 +353,32 @@ fn f() { check_assist_not_applicable(remove_dbg, r#"$0dbg$0!(0)"#); check_assist_not_applicable(remove_dbg, r#"$0dbg!(0$0)"#); } + + #[test] + fn test_nested_dbg() { + check( + r#"$0let x = dbg!(dbg!(dbg!(dbg!(0 + 1)) * 2) + dbg!(3));$0"#, + r#"let x = ((0 + 1) * 2) + 3;"#, + ); + check(r#"$0dbg!(10, dbg!(), dbg!(20, 30))$0"#, r#"(10, (), (20, 30))"#); + } + + #[test] + fn test_multiple_nested_dbg() { + check( + r#" +fn f() { + $0dbg!(); + let x = dbg!(dbg!(dbg!(0 + 1)) + 2) + dbg!(3); + dbg!(10, dbg!(), dbg!(20, 30));$0 +} +"#, + r#" +fn f() { + let x = ((0 + 1) + 2) + 3; + (10, (), (20, 30)); +} +"#, + ); + } } diff --git a/crates/ide-assists/src/tests/generated.rs b/crates/ide-assists/src/tests/generated.rs index 8a25e1f648..524af20013 100644 --- a/crates/ide-assists/src/tests/generated.rs +++ b/crates/ide-assists/src/tests/generated.rs @@ -2006,12 +2006,12 @@ fn doctest_remove_dbg() { "remove_dbg", r#####" fn main() { - $0dbg!(92); + let x = $0dbg!(42 * dbg!(4 + 2));$0 } "#####, r#####" fn main() { - 92; + let x = 42 * (4 + 2); } "#####, )