diff options
Diffstat (limited to 'src/tools/rust-analyzer/crates/ide-assists/src/handlers/add_missing_match_arms.rs')
| -rw-r--r-- | src/tools/rust-analyzer/crates/ide-assists/src/handlers/add_missing_match_arms.rs | 201 |
1 files changed, 192 insertions, 9 deletions
diff --git a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/add_missing_match_arms.rs b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/add_missing_match_arms.rs index 8e4ac69ae..5d81e8cfe 100644 --- a/src/tools/rust-analyzer/crates/ide-assists/src/handlers/add_missing_match_arms.rs +++ b/src/tools/rust-analyzer/crates/ide-assists/src/handlers/add_missing_match_arms.rs @@ -140,6 +140,31 @@ pub(crate) fn add_missing_match_arms(acc: &mut Assists, ctx: &AssistContext<'_>) }) .filter(|(variant_pat, _)| is_variant_missing(&top_lvl_pats, variant_pat)); ((Box::new(missing_pats) as Box<dyn Iterator<Item = _>>).peekable(), is_non_exhaustive) + } else if let Some((enum_def, len)) = resolve_array_of_enum_def(&ctx.sema, &expr) { + let is_non_exhaustive = enum_def.is_non_exhaustive(ctx.db(), module.krate()); + let variants = enum_def.variants(ctx.db()); + + if len.pow(variants.len() as u32) > 256 { + return None; + } + + let variants_of_enums = vec![variants.clone(); len]; + + let missing_pats = variants_of_enums + .into_iter() + .multi_cartesian_product() + .inspect(|_| cov_mark::hit!(add_missing_match_arms_lazy_computation)) + .map(|variants| { + let is_hidden = variants + .iter() + .any(|variant| variant.should_be_hidden(ctx.db(), module.krate())); + let patterns = variants.into_iter().filter_map(|variant| { + build_pat(ctx.db(), module, variant.clone(), ctx.config.prefer_no_std) + }); + (ast::Pat::from(make::slice_pat(patterns)), is_hidden) + }) + .filter(|(variant_pat, _)| is_variant_missing(&top_lvl_pats, variant_pat)); + ((Box::new(missing_pats) as Box<dyn Iterator<Item = _>>).peekable(), is_non_exhaustive) } else { return None; }; @@ -266,9 +291,13 @@ fn is_variant_missing(existing_pats: &[Pat], var: &Pat) -> bool { fn does_pat_match_variant(pat: &Pat, var: &Pat) -> bool { match (pat, var) { (Pat::WildcardPat(_), _) => true, + (Pat::SlicePat(spat), Pat::SlicePat(svar)) => { + spat.pats().zip(svar.pats()).all(|(p, v)| does_pat_match_variant(&p, &v)) + } (Pat::TuplePat(tpat), Pat::TuplePat(tvar)) => { tpat.fields().zip(tvar.fields()).all(|(p, v)| does_pat_match_variant(&p, &v)) } + (Pat::OrPat(opat), _) => opat.pats().any(|p| does_pat_match_variant(&p, var)), _ => utils::does_pat_match_variant(pat, var), } } @@ -279,7 +308,7 @@ enum ExtendedEnum { Enum(hir::Enum), } -#[derive(Eq, PartialEq, Clone, Copy)] +#[derive(Eq, PartialEq, Clone, Copy, Debug)] enum ExtendedVariant { True, False, @@ -339,15 +368,30 @@ fn resolve_tuple_of_enum_def( .tuple_fields(sema.db) .iter() .map(|ty| { - ty.autoderef(sema.db).find_map(|ty| match ty.as_adt() { - Some(Adt::Enum(e)) => Some(lift_enum(e)), - // For now we only handle expansion for a tuple of enums. Here - // we map non-enum items to None and rely on `collect` to - // convert Vec<Option<hir::Enum>> into Option<Vec<hir::Enum>>. - _ => ty.is_bool().then_some(ExtendedEnum::Bool), + ty.autoderef(sema.db).find_map(|ty| { + match ty.as_adt() { + Some(Adt::Enum(e)) => Some(lift_enum(e)), + // For now we only handle expansion for a tuple of enums. Here + // we map non-enum items to None and rely on `collect` to + // convert Vec<Option<hir::Enum>> into Option<Vec<hir::Enum>>. + _ => ty.is_bool().then_some(ExtendedEnum::Bool), + } }) }) - .collect() + .collect::<Option<Vec<ExtendedEnum>>>() + .and_then(|list| if list.is_empty() { None } else { Some(list) }) +} + +fn resolve_array_of_enum_def( + sema: &Semantics<'_, RootDatabase>, + expr: &ast::Expr, +) -> Option<(ExtendedEnum, usize)> { + sema.type_of_expr(expr)?.adjusted().as_array(sema.db).and_then(|(ty, len)| { + ty.autoderef(sema.db).find_map(|ty| match ty.as_adt() { + Some(Adt::Enum(e)) => Some((lift_enum(e), len)), + _ => ty.is_bool().then_some((ExtendedEnum::Bool, len)), + }) + }) } fn build_pat( @@ -376,7 +420,6 @@ fn build_pat( } ast::StructKind::Unit => make::path_pat(path), }; - Some(pat) } ExtendedVariant::True => Some(ast::Pat::from(make::literal_pat("true"))), @@ -526,6 +569,19 @@ fn foo(a: bool) { r#" fn foo(a: bool) { match (a, a)$0 { + (true | false, true) => {} + (true, false) => {} + (false, false) => {} + } +} +"#, + ); + + check_assist_not_applicable( + add_missing_match_arms, + r#" +fn foo(a: bool) { + match (a, a)$0 { (true, true) => {} (true, false) => {} (false, true) => {} @@ -560,12 +616,112 @@ fn foo(a: bool) { } #[test] + fn fill_boolean_array() { + check_assist( + add_missing_match_arms, + r#" +fn foo(a: bool) { + match [a]$0 { + } +} +"#, + r#" +fn foo(a: bool) { + match [a] { + $0[true] => todo!(), + [false] => todo!(), + } +} +"#, + ); + + check_assist( + add_missing_match_arms, + r#" +fn foo(a: bool) { + match [a,]$0 { + } +} +"#, + r#" +fn foo(a: bool) { + match [a,] { + $0[true] => todo!(), + [false] => todo!(), + } +} +"#, + ); + + check_assist( + add_missing_match_arms, + r#" +fn foo(a: bool) { + match [a, a]$0 { + [true, true] => todo!(), + } +} +"#, + r#" +fn foo(a: bool) { + match [a, a] { + [true, true] => todo!(), + $0[true, false] => todo!(), + [false, true] => todo!(), + [false, false] => todo!(), + } +} +"#, + ); + + check_assist( + add_missing_match_arms, + r#" +fn foo(a: bool) { + match [a, a]$0 { + } +} +"#, + r#" +fn foo(a: bool) { + match [a, a] { + $0[true, true] => todo!(), + [true, false] => todo!(), + [false, true] => todo!(), + [false, false] => todo!(), + } +} +"#, + ) + } + + #[test] fn partial_fill_boolean_tuple() { check_assist( add_missing_match_arms, r#" fn foo(a: bool) { match (a, a)$0 { + (true | false, true) => {} + } +} +"#, + r#" +fn foo(a: bool) { + match (a, a) { + (true | false, true) => {} + $0(true, false) => todo!(), + (false, false) => todo!(), + } +} +"#, + ); + + check_assist( + add_missing_match_arms, + r#" +fn foo(a: bool) { + match (a, a)$0 { (false, true) => {} } } @@ -882,6 +1038,33 @@ fn main() { } "#, ); + + check_assist( + add_missing_match_arms, + r#" +enum E { A, B, C } +fn main() { + use E::*; + match (A, B, C)$0 { + (A | B , A, A | B | C) => (), + (A | B | C , B | C, A | B | C) => (), + } +} +"#, + r#" +enum E { A, B, C } +fn main() { + use E::*; + match (A, B, C) { + (A | B , A, A | B | C) => (), + (A | B | C , B | C, A | B | C) => (), + $0(C, A, A) => todo!(), + (C, A, B) => todo!(), + (C, A, C) => todo!(), + } +} +"#, + ) } #[test] |