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Merge #10574

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10574: fix: Fix PartialOrd codegen r=lnicola a=yoshuawuyts

Closes https://github.com/rust-analyzer/rust-analyzer/issues/10571#issuecomment-945516462. Thanks!

r? `@lnicola` 

Co-authored-by: Yoshua Wuyts <yoshuawuyts@gmail.com>
This commit is contained in:
bors[bot] 2021-10-18 10:47:04 +00:00 committed by GitHub
commit 48c3be922e
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2 changed files with 10 additions and 253 deletions
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119
crates/ide_assists/src/handlers/replace_derive_with_manual_impl.rs
View File

@ -693,7 +693,7 @@ struct Foo {
impl PartialOrd for Foo {
$0fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
self.bin.partial_cmp(other.bin)
self.bin.partial_cmp(&other.bin)
}
}
"#,
@ -722,7 +722,7 @@ struct Foo {
impl PartialOrd for Foo {
$0fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
(self.bin, self.bar, self.baz).partial_cmp((other.bin, other.bar, other.baz))
(self.bin, self.bar, self.baz).partial_cmp(&(other.bin, other.bar, other.baz))
}
}
"#,
@ -743,120 +743,7 @@ fn add_custom_impl_partial_ord_tuple_struct() {
impl PartialOrd for Foo {
$0fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
(self.0, self.1, self.2).partial_cmp((other.0, other.1, other.2))
}
}
"#,
)
}
#[test]
fn add_custom_impl_partial_ord_enum() {
check_assist(
replace_derive_with_manual_impl,
r#"
//- minicore: ord
#[derive(Partial$0Ord)]
enum Foo {
Bin,
Bar,
Baz,
}
"#,
r#"
enum Foo {
Bin,
Bar,
Baz,
}
impl PartialOrd for Foo {
$0fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
core::mem::discriminant(self).partial_cmp(core::mem::discriminant(other))
}
}
"#,
)
}
#[test]
fn add_custom_impl_partial_ord_record_enum() {
check_assist(
replace_derive_with_manual_impl,
r#"
//- minicore: ord
#[derive(Partial$0Ord)]
enum Foo {
Bar {
bin: String,
},
Baz {
qux: String,
fez: String,
},
Qux {},
Bin,
}
"#,
r#"
enum Foo {
Bar {
bin: String,
},
Baz {
qux: String,
fez: String,
},
Qux {},
Bin,
}
impl PartialOrd for Foo {
$0fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
match (self, other) {
(Self::Bar { bin: l_bin }, Self::Bar { bin: r_bin }) => l_bin.partial_cmp(r_bin),
(Self::Baz { qux: l_qux, fez: l_fez }, Self::Baz { qux: r_qux, fez: r_fez }) => {
(l_qux, l_fez).partial_cmp((r_qux, r_fez))
}
_ => core::mem::discriminant(self).partial_cmp(core::mem::discriminant(other)),
}
}
}
"#,
)
}
#[test]
fn add_custom_impl_partial_ord_tuple_enum() {
check_assist(
replace_derive_with_manual_impl,
r#"
//- minicore: ord
#[derive(Partial$0Ord)]
enum Foo {
Bar(String),
Baz(String, String),
Qux(),
Bin,
}
"#,
r#"
enum Foo {
Bar(String),
Baz(String, String),
Qux(),
Bin,
}
impl PartialOrd for Foo {
$0fn partial_cmp(&self, other: &Self) -> Option<core::cmp::Ordering> {
match (self, other) {
(Self::Bar(l0), Self::Bar(r0)) => l0.partial_cmp(r0),
(Self::Baz(l0, l1), Self::Baz(r0, r1)) => {
(l0, l1).partial_cmp((r0, r1))
}
_ => core::mem::discriminant(self).partial_cmp(core::mem::discriminant(other)),
}
(self.0, self.1, self.2).partial_cmp(&(other.0, other.1, other.2))
}
}
"#,

144
crates/ide_assists/src/utils/gen_trait_fn_body.rs
View File

@ -574,154 +574,24 @@ fn gen_tuple_field(field_name: &String) -> ast::Pat {
}
fn gen_partial_ord(adt: &ast::Adt, func: &ast::Fn) -> Option<()> {
fn gen_partial_cmp_call(lhs: ast::Expr, rhs: ast::Expr) -> ast::Expr {
let method = make::name_ref("partial_cmp");
make::expr_method_call(lhs, method, make::arg_list(Some(rhs)))
}
fn gen_partial_cmp_call2(mut lhs: Vec<ast::Expr>, mut rhs: Vec<ast::Expr>) -> ast::Expr {
fn gen_partial_cmp_call(mut lhs: Vec<ast::Expr>, mut rhs: Vec<ast::Expr>) -> ast::Expr {
let (lhs, rhs) = match (lhs.len(), rhs.len()) {
(1, 1) => (lhs.pop().unwrap(), rhs.pop().unwrap()),
_ => (make::expr_tuple(lhs.into_iter()), make::expr_tuple(rhs.into_iter())),
};
let rhs = make::expr_ref(rhs, false);
let method = make::name_ref("partial_cmp");
make::expr_method_call(lhs, method, make::arg_list(Some(rhs)))
}
fn gen_record_pat_field(field_name: &str, pat_name: &str) -> ast::RecordPatField {
let pat = make::ext::simple_ident_pat(make::name(&pat_name));
let name_ref = make::name_ref(field_name);
make::record_pat_field(name_ref, pat.into())
}
fn gen_record_pat(record_name: ast::Path, fields: Vec<ast::RecordPatField>) -> ast::RecordPat {
let list = make::record_pat_field_list(fields);
make::record_pat_with_fields(record_name, list)
}
fn gen_variant_path(variant: &ast::Variant) -> Option<ast::Path> {
make::ext::path_from_idents(["Self", &variant.name()?.to_string()])
}
fn gen_tuple_field(field_name: &String) -> ast::Pat {
ast::Pat::IdentPat(make::ident_pat(false, false, make::name(field_name)))
}
// FIXME: return `None` if the trait carries a generic type; we can only
// generate this code `Self` for the time being.
let body = match adt {
// `Hash` cannot be derived for unions, so no default impl can be provided.
// `PartialOrd` cannot be derived for unions, so no default impl can be provided.
ast::Adt::Union(_) => return None,
ast::Adt::Enum(enum_) => {
// => std::mem::discriminant(self) == std::mem::discriminant(other)
let lhs_name = make::expr_path(make::ext::ident_path("self"));
let lhs = make::expr_call(make_discriminant()?, make::arg_list(Some(lhs_name.clone())));
let rhs_name = make::expr_path(make::ext::ident_path("other"));
let rhs = make::expr_call(make_discriminant()?, make::arg_list(Some(rhs_name.clone())));
let ord_check = gen_partial_cmp_call(lhs, rhs);
let mut case_count = 0;
let mut arms = vec![];
for variant in enum_.variant_list()?.variants() {
case_count += 1;
match variant.field_list() {
// => (Self::Bar { bin: l_bin }, Self::Bar { bin: r_bin }) => l_bin == r_bin,
Some(ast::FieldList::RecordFieldList(list)) => {
let mut l_pat_fields = vec![];
let mut r_pat_fields = vec![];
let mut l_fields = vec![];
let mut r_fields = vec![];
for field in list.fields() {
let field_name = field.name()?.to_string();
let l_name = &format!("l_{}", field_name);
l_pat_fields.push(gen_record_pat_field(&field_name, &l_name));
let r_name = &format!("r_{}", field_name);
r_pat_fields.push(gen_record_pat_field(&field_name, &r_name));
let lhs = make::expr_path(make::ext::ident_path(l_name));
let rhs = make::expr_path(make::ext::ident_path(r_name));
l_fields.push(lhs);
r_fields.push(rhs);
}
let left_pat = gen_record_pat(gen_variant_path(&variant)?, l_pat_fields);
let right_pat = gen_record_pat(gen_variant_path(&variant)?, r_pat_fields);
let tuple_pat = make::tuple_pat(vec![left_pat.into(), right_pat.into()]);
let len = l_fields.len();
if len != 0 {
let mut expr = gen_partial_cmp_call2(l_fields, r_fields);
if len >= 2 {
expr = make::block_expr(None, Some(expr))
.indent(ast::edit::IndentLevel(1))
.into();
}
arms.push(make::match_arm(Some(tuple_pat.into()), None, expr));
}
}
Some(ast::FieldList::TupleFieldList(list)) => {
let mut l_pat_fields = vec![];
let mut r_pat_fields = vec![];
let mut l_fields = vec![];
let mut r_fields = vec![];
for (i, _) in list.fields().enumerate() {
let field_name = format!("{}", i);
let l_name = format!("l{}", field_name);
l_pat_fields.push(gen_tuple_field(&l_name));
let r_name = format!("r{}", field_name);
r_pat_fields.push(gen_tuple_field(&r_name));
let lhs = make::expr_path(make::ext::ident_path(&l_name));
let rhs = make::expr_path(make::ext::ident_path(&r_name));
l_fields.push(lhs);
r_fields.push(rhs);
}
let left_pat =
make::tuple_struct_pat(gen_variant_path(&variant)?, l_pat_fields);
let right_pat =
make::tuple_struct_pat(gen_variant_path(&variant)?, r_pat_fields);
let tuple_pat = make::tuple_pat(vec![left_pat.into(), right_pat.into()]);
let len = l_fields.len();
if len != 0 {
let mut expr = gen_partial_cmp_call2(l_fields, r_fields);
if len >= 2 {
expr = make::block_expr(None, Some(expr))
.indent(ast::edit::IndentLevel(1))
.into();
}
arms.push(make::match_arm(Some(tuple_pat.into()), None, expr));
}
}
None => continue,
}
}
let expr = match arms.len() {
0 => ord_check,
_ => {
if case_count > arms.len() {
let lhs = make::wildcard_pat().into();
arms.push(make::match_arm(Some(lhs), None, ord_check));
}
let match_target = make::expr_tuple(vec![lhs_name, rhs_name]);
let list = make::match_arm_list(arms).indent(ast::edit::IndentLevel(1));
make::expr_match(match_target, list)
}
};
make::block_expr(None, Some(expr)).indent(ast::edit::IndentLevel(1))
}
// `core::mem::Discriminant` does not implement `PartialOrd` in stable Rust today.
ast::Adt::Enum(_) => return None,
ast::Adt::Struct(strukt) => match strukt.field_list() {
Some(ast::FieldList::RecordFieldList(field_list)) => {
let mut l_fields = vec![];
@ -735,7 +605,7 @@ fn gen_tuple_field(field_name: &String) -> ast::Pat {
r_fields.push(rhs);
}
let expr = gen_partial_cmp_call2(l_fields, r_fields);
let expr = gen_partial_cmp_call(l_fields, r_fields);
make::block_expr(None, Some(expr)).indent(ast::edit::IndentLevel(1))
}
@ -751,7 +621,7 @@ fn gen_tuple_field(field_name: &String) -> ast::Pat {
l_fields.push(lhs);
r_fields.push(rhs);
}
let expr = gen_partial_cmp_call2(l_fields, r_fields);
let expr = gen_partial_cmp_call(l_fields, r_fields);
make::block_expr(None, Some(expr)).indent(ast::edit::IndentLevel(1))
}