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Auto merge of #18038 - roife:fix-issue-18034, r=Veykril

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feat: generate names for tuple-struct in add-missing-match-arms

fix #18034.

This PR includes the following enhancement:

- Introduced a `NameGenerator` in `suggest_name`, which implements an automatic renaming algorithm to avoid name conflicts. Here are a few examples:

```rust
let mut generator = NameGenerator::new();
assert_eq!(generator.suggest_name("a"), "a");
assert_eq!(generator.suggest_name("a"), "a1");
assert_eq!(generator.suggest_name("a"), "a2");

assert_eq!(generator.suggest_name("b"), "b");
assert_eq!(generator.suggest_name("b"), "b1");
assert_eq!(generator.suggest_name("b2"), "b2");
assert_eq!(generator.suggest_name("b"), "b3");
assert_eq!(generator.suggest_name("b"), "b4");
assert_eq!(generator.suggest_name("b3"), "b5");
```

- Updated existing testcases in ide-assists for the new `NameGenerator` (only modified generated names).
- Generate names for tuple structs instead of using wildcard patterns in `add-missing-match-arms`.
This commit is contained in:
bors 2024-09-12 08:21:37 +00:00
commit a91ca0e2fc
6 changed files with 295 additions and 102 deletions
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130
crates/ide-assists/src/handlers/add_missing_match_arms.rs
View file

@ -1,12 +1,13 @@
use std::iter::{self, Peekable};
use either::Either;
use hir::{sym, Adt, Crate, HasAttrs, HasSource, ImportPathConfig, ModuleDef, Semantics};
use hir::{sym, Adt, Crate, HasAttrs, ImportPathConfig, ModuleDef, Semantics};
use ide_db::syntax_helpers::suggest_name;
use ide_db::RootDatabase;
use ide_db::{famous_defs::FamousDefs, helpers::mod_path_to_ast};
use itertools::Itertools;
use syntax::ast::edit_in_place::Removable;
use syntax::ast::{self, make, AstNode, HasName, MatchArmList, MatchExpr, Pat};
use syntax::ast::{self, make, AstNode, MatchArmList, MatchExpr, Pat};
use crate::{utils, AssistContext, AssistId, AssistKind, Assists};
@ -90,7 +91,7 @@ pub(crate) fn add_missing_match_arms(acc: &mut Assists, ctx: &AssistContext<'_>)
.into_iter()
.filter_map(|variant| {
Some((
build_pat(ctx.db(), module, variant, cfg)?,
build_pat(ctx, module, variant, cfg)?,
variant.should_be_hidden(ctx.db(), module.krate()),
))
})
@ -141,9 +142,8 @@ pub(crate) fn add_missing_match_arms(acc: &mut Assists, ctx: &AssistContext<'_>)
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, cfg));
let patterns =
variants.into_iter().filter_map(|variant| build_pat(ctx, module, variant, cfg));
(ast::Pat::from(make::tuple_pat(patterns)), is_hidden)
})
@ -174,9 +174,8 @@ pub(crate) fn add_missing_match_arms(acc: &mut Assists, ctx: &AssistContext<'_>)
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, cfg));
let patterns =
variants.into_iter().filter_map(|variant| build_pat(ctx, module, variant, cfg));
(ast::Pat::from(make::slice_pat(patterns)), is_hidden)
})
.filter(|(variant_pat, _)| is_variant_missing(&top_lvl_pats, variant_pat));
@ -438,33 +437,39 @@ fn resolve_array_of_enum_def(
}
fn build_pat(
db: &RootDatabase,
ctx: &AssistContext<'_>,
module: hir::Module,
var: ExtendedVariant,
cfg: ImportPathConfig,
) -> Option<ast::Pat> {
let db = ctx.db();
match var {
ExtendedVariant::Variant(var) => {
let edition = module.krate().edition(db);
let path = mod_path_to_ast(&module.find_path(db, ModuleDef::from(var), cfg)?, edition);
// FIXME: use HIR for this; it doesn't currently expose struct vs. tuple vs. unit variants though
Some(match var.source(db)?.value.kind() {
ast::StructKind::Tuple(field_list) => {
let pats =
iter::repeat(make::wildcard_pat().into()).take(field_list.fields().count());
let fields = var.fields(db);
let pat = match var.kind(db) {
hir::StructKind::Tuple => {
let mut name_generator = suggest_name::NameGenerator::new();
let pats = fields.into_iter().map(|f| {
let name = name_generator.for_type(&f.ty(db), db, edition);
match name {
Some(name) => make::ext::simple_ident_pat(make::name(&name)).into(),
None => make::wildcard_pat().into(),
}
});
make::tuple_struct_pat(path, pats).into()
}
ast::StructKind::Record(field_list) => {
let pats = field_list.fields().map(|f| {
make::ext::simple_ident_pat(
f.name().expect("Record field must have a name"),
)
.into()
});
hir::StructKind::Record => {
let pats = fields
.into_iter()
.map(|f| make::name(f.name(db).as_str()))
.map(|name| make::ext::simple_ident_pat(name).into());
make::record_pat(path, pats).into()
}
ast::StructKind::Unit => make::path_pat(path),
})
hir::StructKind::Unit => make::path_pat(path),
};
Some(pat)
}
ExtendedVariant::True => Some(ast::Pat::from(make::literal_pat("true"))),
ExtendedVariant::False => Some(ast::Pat::from(make::literal_pat("false"))),
@ -1976,4 +1981,81 @@ fn a() {
}"#,
)
}
#[test]
fn suggest_name_for_tuple_struct_patterns() {
// single tuple struct
check_assist(
add_missing_match_arms,
r#"
struct S;
pub enum E {
A
B(S),
}
fn f() {
let value = E::A;
match value {
$0
}
}
"#,
r#"
struct S;
pub enum E {
A
B(S),
}
fn f() {
let value = E::A;
match value {
$0E::A => todo!(),
E::B(s) => todo!(),
}
}
"#,
);
// multiple tuple struct patterns
check_assist(
add_missing_match_arms,
r#"
struct S1;
struct S2;
pub enum E {
A
B(S1, S2),
}
fn f() {
let value = E::A;
match value {
$0
}
}
"#,
r#"
struct S1;
struct S2;
pub enum E {
A
B(S1, S2),
}
fn f() {
let value = E::A;
match value {
$0E::A => todo!(),
E::B(s1, s2) => todo!(),
}
}
"#,
);
}
}

35
crates/ide-assists/src/handlers/generate_delegate_trait.rs
View file

@ -584,7 +584,7 @@ fn resolve_name_conflicts(
for old_strukt_param in old_strukt_params.generic_params() {
// Get old name from `strukt`
let mut name = SmolStr::from(match &old_strukt_param {
let name = SmolStr::from(match &old_strukt_param {
ast::GenericParam::ConstParam(c) => c.name()?.to_string(),
ast::GenericParam::LifetimeParam(l) => {
l.lifetime()?.lifetime_ident_token()?.to_string()
@ -593,8 +593,19 @@ fn resolve_name_conflicts(
});
// The new name cannot be conflicted with generics in trait, and the renamed names.
name = suggest_name::for_unique_generic_name(&name, old_impl_params);
name = suggest_name::for_unique_generic_name(&name, &params);
let param_list_to_names = |param_list: &GenericParamList| {
param_list.generic_params().flat_map(|param| match param {
ast::GenericParam::TypeParam(t) => t.name().map(|name| name.to_string()),
p => Some(p.to_string()),
})
};
let existing_names = param_list_to_names(old_impl_params)
.chain(param_list_to_names(&params))
.collect_vec();
let mut name_generator = suggest_name::NameGenerator::new_with_names(
existing_names.iter().map(|s| s.as_str()),
);
let name = name_generator.suggest_name(&name);
match old_strukt_param {
ast::GenericParam::ConstParam(c) => {
if let Some(const_ty) = c.ty() {
@ -1213,9 +1224,9 @@ struct S<T> {
b : B<T>,
}
impl<T0> Trait<T0> for S<T0> {
fn f(&self, a: T0) -> T0 {
<B<T0> as Trait<T0>>::f(&self.b, a)
impl<T1> Trait<T1> for S<T1> {
fn f(&self, a: T1) -> T1 {
<B<T1> as Trait<T1>>::f(&self.b, a)
}
}
"#,
@ -1527,12 +1538,12 @@ where
b : B<T, T1>,
}
impl<T, T2, T10> Trait<T> for S<T2, T10>
impl<T, T2, T3> Trait<T> for S<T2, T3>
where
T10: AnotherTrait
T3: AnotherTrait
{
fn f(&self, a: T) -> T {
<B<T2, T10> as Trait<T>>::f(&self.b, a)
<B<T2, T3> as Trait<T>>::f(&self.b, a)
}
}"#,
);
@ -1589,12 +1600,12 @@ where
b : B<T>,
}
impl<T, T0> Trait<T> for S<T0>
impl<T, T2> Trait<T> for S<T2>
where
T0: AnotherTrait
T2: AnotherTrait
{
fn f(&self, a: T) -> T {
<B<T0> as Trait<T>>::f(&self.b, a)
<B<T2> as Trait<T>>::f(&self.b, a)
}
}"#,
);

21
crates/ide-assists/src/handlers/introduce_named_generic.rs
View file

@ -1,6 +1,7 @@
use ide_db::syntax_helpers::suggest_name;
use itertools::Itertools;
use syntax::{
ast::{self, edit_in_place::GenericParamsOwnerEdit, make, AstNode, HasGenericParams},
ast::{self, edit_in_place::GenericParamsOwnerEdit, make, AstNode, HasGenericParams, HasName},
ted,
};
@ -33,8 +34,18 @@ pub(crate) fn introduce_named_generic(acc: &mut Assists, ctx: &AssistContext<'_>
let impl_trait_type = edit.make_mut(impl_trait_type);
let fn_ = edit.make_mut(fn_);
let fn_generic_param_list = fn_.get_or_create_generic_param_list();
let type_param_name =
suggest_name::for_impl_trait_as_generic(&impl_trait_type, &fn_generic_param_list);
let existing_names = fn_generic_param_list
.generic_params()
.flat_map(|param| match param {
ast::GenericParam::TypeParam(t) => t.name().map(|name| name.to_string()),
p => Some(p.to_string()),
})
.collect_vec();
let type_param_name = suggest_name::NameGenerator::new_with_names(
existing_names.iter().map(|s| s.as_str()),
)
.for_impl_trait_as_generic(&impl_trait_type);
let type_param = make::type_param(make::name(&type_param_name), Some(type_bound_list))
.clone_for_update();
@ -116,7 +127,7 @@ fn foo<$0B: Bar
check_assist(
introduce_named_generic,
r#"fn foo<B>(bar: $0impl Bar) {}"#,
r#"fn foo<B, $0B0: Bar>(bar: B0) {}"#,
r#"fn foo<B, $0B1: Bar>(bar: B1) {}"#,
);
}
@ -125,7 +136,7 @@ fn foo<$0B: Bar
check_assist(
introduce_named_generic,
r#"fn foo<B, B0, B1, B3>(bar: $0impl Bar) {}"#,
r#"fn foo<B, B0, B1, B3, $0B2: Bar>(bar: B2) {}"#,
r#"fn foo<B, B0, B1, B3, $0B4: Bar>(bar: B4) {}"#,
);
}

3
crates/ide-completion/src/completions/pattern.rs
View file

@ -48,11 +48,12 @@ pub(crate) fn complete_pattern(
// Suggest name only in let-stmt and fn param
if pattern_ctx.should_suggest_name {
let mut name_generator = suggest_name::NameGenerator::new();
if let Some(suggested) = ctx
.expected_type
.as_ref()
.map(|ty| ty.strip_references())
.and_then(|ty| suggest_name::for_type(&ty, ctx.db, ctx.edition))
.and_then(|ty| name_generator.for_type(&ty, ctx.db, ctx.edition))
{
acc.suggest_name(ctx, &suggested);
}

206
crates/ide-db/src/syntax_helpers/suggest_name.rs
View file

@ -1,12 +1,14 @@
//! This module contains functions to suggest names for expressions, functions and other items
use std::{collections::hash_map::Entry, str::FromStr};
use hir::Semantics;
use itertools::Itertools;
use rustc_hash::FxHashSet;
use rustc_hash::FxHashMap;
use stdx::to_lower_snake_case;
use syntax::{
ast::{self, HasName},
match_ast, AstNode, Edition, SmolStr,
match_ast, AstNode, Edition, SmolStr, SmolStrBuilder,
};
use crate::RootDatabase;
@ -62,71 +64,131 @@ const USELESS_METHODS: &[&str] = &[
"into_future",
];
/// Suggest a name for given type.
/// Generator for new names
///
/// The function will strip references first, and suggest name from the inner type.
/// The generator keeps track of existing names and suggests new names that do
/// not conflict with existing names.
///
/// - If `ty` is an ADT, it will suggest the name of the ADT.
/// + If `ty` is wrapped in `Box`, `Option` or `Result`, it will suggest the name from the inner type.
/// - If `ty` is a trait, it will suggest the name of the trait.
/// - If `ty` is an `impl Trait`, it will suggest the name of the first trait.
/// The generator will try to resolve conflicts by adding a numeric suffix to
/// the name, e.g. `a`, `a1`, `a2`, ...
///
/// If the suggested name conflicts with reserved keywords, it will return `None`.
pub fn for_type(ty: &hir::Type, db: &RootDatabase, edition: Edition) -> Option<String> {
let ty = ty.strip_references();
name_of_type(&ty, db, edition)
/// # Examples
/// ```rust
/// let mut generator = NameGenerator::new();
/// assert_eq!(generator.suggest_name("a"), "a");
/// assert_eq!(generator.suggest_name("a"), "a1");
///
/// assert_eq!(generator.suggest_name("b2"), "b2");
/// assert_eq!(generator.suggest_name("b"), "b3");
/// ```
#[derive(Debug, Default)]
pub struct NameGenerator {
pool: FxHashMap<SmolStr, usize>,
}
/// Suggest a unique name for generic parameter.
///
/// `existing_params` is used to check if the name conflicts with existing
/// generic parameters.
///
/// The function checks if the name conflicts with existing generic parameters.
/// If so, it will try to resolve the conflict by adding a number suffix, e.g.
/// `T`, `T0`, `T1`, ...
pub fn for_unique_generic_name(name: &str, existing_params: &ast::GenericParamList) -> SmolStr {
let param_names = existing_params
.generic_params()
.map(|param| match param {
ast::GenericParam::TypeParam(t) => t.name().unwrap().to_string(),
p => p.to_string(),
})
.collect::<FxHashSet<_>>();
let mut name = name.to_owned();
let base_len = name.len();
let mut count = 0;
while param_names.contains(&name) {
name.truncate(base_len);
name.push_str(&count.to_string());
count += 1;
impl NameGenerator {
/// Create a new empty generator
pub fn new() -> Self {
Self { pool: FxHashMap::default() }
}
name.into()
}
/// Create a new generator with existing names. When suggesting a name, it will
/// avoid conflicts with existing names.
pub fn new_with_names<'a>(existing_names: impl Iterator<Item = &'a str>) -> Self {
let mut generator = Self::new();
existing_names.for_each(|name| generator.insert(name));
generator
}
/// Suggest name of impl trait type
///
/// `existing_params` is used to check if the name conflicts with existing
/// generic parameters.
///
/// # Current implementation
///
/// In current implementation, the function tries to get the name from the first
/// character of the name for the first type bound.
///
/// If the name conflicts with existing generic parameters, it will try to
/// resolve the conflict with `for_unique_generic_name`.
pub fn for_impl_trait_as_generic(
ty: &ast::ImplTraitType,
existing_params: &ast::GenericParamList,
) -> SmolStr {
let c = ty
.type_bound_list()
.and_then(|bounds| bounds.syntax().text().char_at(0.into()))
.unwrap_or('T');
/// Suggest a name without conflicts. If the name conflicts with existing names,
/// it will try to resolve the conflict by adding a numeric suffix.
pub fn suggest_name(&mut self, name: &str) -> SmolStr {
let (prefix, suffix) = Self::split_numeric_suffix(name);
let prefix = SmolStr::new(prefix);
let suffix = suffix.unwrap_or(0);
for_unique_generic_name(c.encode_utf8(&mut [0; 4]), existing_params)
match self.pool.entry(prefix.clone()) {
Entry::Vacant(entry) => {
entry.insert(suffix);
SmolStr::from_str(name).unwrap()
}
Entry::Occupied(mut entry) => {
let count = entry.get_mut();
*count = (*count + 1).max(suffix);
let mut new_name = SmolStrBuilder::new();
new_name.push_str(&prefix);
new_name.push_str(count.to_string().as_str());
new_name.finish()
}
}
}
/// Suggest a name for given type.
///
/// The function will strip references first, and suggest name from the inner type.
///
/// - If `ty` is an ADT, it will suggest the name of the ADT.
/// + If `ty` is wrapped in `Box`, `Option` or `Result`, it will suggest the name from the inner type.
/// - If `ty` is a trait, it will suggest the name of the trait.
/// - If `ty` is an `impl Trait`, it will suggest the name of the first trait.
///
/// If the suggested name conflicts with reserved keywords, it will return `None`.
pub fn for_type(
&mut self,
ty: &hir::Type,
db: &RootDatabase,
edition: Edition,
) -> Option<SmolStr> {
let name = name_of_type(ty, db, edition)?;
Some(self.suggest_name(&name))
}
/// Suggest name of impl trait type
///
/// # Current implementation
///
/// In current implementation, the function tries to get the name from the first
/// character of the name for the first type bound.
///
/// If the name conflicts with existing generic parameters, it will try to
/// resolve the conflict with `for_unique_generic_name`.
pub fn for_impl_trait_as_generic(&mut self, ty: &ast::ImplTraitType) -> SmolStr {
let c = ty
.type_bound_list()
.and_then(|bounds| bounds.syntax().text().char_at(0.into()))
.unwrap_or('T');
self.suggest_name(&c.to_string())
}
/// Insert a name into the pool
fn insert(&mut self, name: &str) {
let (prefix, suffix) = Self::split_numeric_suffix(name);
let prefix = SmolStr::new(prefix);
let suffix = suffix.unwrap_or(0);
match self.pool.entry(prefix) {
Entry::Vacant(entry) => {
entry.insert(suffix);
}
Entry::Occupied(mut entry) => {
let count = entry.get_mut();
*count = (*count).max(suffix);
}
}
}
/// Remove the numeric suffix from the name
///
/// # Examples
/// `a1b2c3` -> `a1b2c`
fn split_numeric_suffix(name: &str) -> (&str, Option<usize>) {
let pos =
name.rfind(|c: char| !c.is_numeric()).expect("Name cannot be empty or all-numeric");
let (prefix, suffix) = name.split_at(pos + 1);
(prefix, suffix.parse().ok())
}
}
/// Suggest name of variable for given expression
@ -290,9 +352,10 @@ fn var_name_from_pat(pat: &ast::Pat) -> Option<ast::Name> {
fn from_type(expr: &ast::Expr, sema: &Semantics<'_, RootDatabase>) -> Option<String> {
let ty = sema.type_of_expr(expr)?.adjusted();
let ty = ty.remove_ref().unwrap_or(ty);
let edition = sema.scope(expr.syntax())?.krate().edition(sema.db);
for_type(&ty, sema.db, edition)
name_of_type(&ty, sema.db, edition)
}
fn name_of_type(ty: &hir::Type, db: &RootDatabase, edition: Edition) -> Option<String> {
@ -925,4 +988,29 @@ fn main() {
"bar",
);
}
#[test]
fn conflicts_with_existing_names() {
let mut generator = NameGenerator::new();
assert_eq!(generator.suggest_name("a"), "a");
assert_eq!(generator.suggest_name("a"), "a1");
assert_eq!(generator.suggest_name("a"), "a2");
assert_eq!(generator.suggest_name("a"), "a3");
assert_eq!(generator.suggest_name("b"), "b");
assert_eq!(generator.suggest_name("b2"), "b2");
assert_eq!(generator.suggest_name("b"), "b3");
assert_eq!(generator.suggest_name("b"), "b4");
assert_eq!(generator.suggest_name("b3"), "b5");
// ---------
let mut generator = NameGenerator::new_with_names(["a", "b", "b2", "c4"].into_iter());
assert_eq!(generator.suggest_name("a"), "a1");
assert_eq!(generator.suggest_name("a"), "a2");
assert_eq!(generator.suggest_name("b"), "b3");
assert_eq!(generator.suggest_name("b2"), "b4");
assert_eq!(generator.suggest_name("c"), "c5");
}
}

2
crates/syntax/src/lib.rs
View file

@ -66,7 +66,7 @@ pub use rowan::{
TokenAtOffset, WalkEvent,
};
pub use rustc_lexer::unescape;
pub use smol_str::{format_smolstr, SmolStr, ToSmolStr};
pub use smol_str::{format_smolstr, SmolStr, SmolStrBuilder, ToSmolStr};
/// `Parse` is the result of the parsing: a syntax tree and a collection of
/// errors.