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|
//! Complete fields in record literals and patterns.
use ide_db::helpers::FamousDefs;
use syntax::ast::Expr;
use crate::{
item::CompletionKind, CompletionContext, CompletionItem, CompletionItemKind, Completions,
};
pub(crate) fn complete_record(acc: &mut Completions, ctx: &CompletionContext) -> Option<()> {
let missing_fields = match (ctx.record_pat_syntax.as_ref(), ctx.record_lit_syntax.as_ref()) {
(None, None) => return None,
(Some(_), Some(_)) => unreachable!("A record cannot be both a literal and a pattern"),
(Some(record_pat), _) => ctx.sema.record_pattern_missing_fields(record_pat),
(_, Some(record_lit)) => {
let ty = ctx.sema.type_of_expr(&Expr::RecordExpr(record_lit.clone()));
let default_trait = FamousDefs(&ctx.sema, ctx.krate).core_default_Default();
let impl_default_trait = default_trait
.and_then(|default_trait| ty.map(|ty| ty.impls_trait(ctx.db, default_trait, &[])))
.unwrap_or(false);
let missing_fields = ctx.sema.record_literal_missing_fields(record_lit);
if impl_default_trait && !missing_fields.is_empty() {
acc.add(
CompletionItem::new(
CompletionKind::Snippet,
ctx.source_range(),
"..Default::default()",
)
.insert_text("..Default::default()")
.kind(CompletionItemKind::Field)
.build(),
);
}
missing_fields
}
};
for (field, ty) in missing_fields {
acc.add_field(ctx, field, &ty);
}
Some(())
}
#[cfg(test)]
mod tests {
use expect_test::{expect, Expect};
use ide_db::helpers::FamousDefs;
use crate::{test_utils::completion_list, CompletionKind};
fn check(ra_fixture: &str, expect: Expect) {
let actual = completion_list(ra_fixture, CompletionKind::Reference);
expect.assert_eq(&actual);
}
fn check_snippet(ra_fixture: &str, expect: Expect) {
let actual = completion_list(
&format!("//- /main.rs crate:main deps:core\n{}\n{}", ra_fixture, FamousDefs::FIXTURE),
CompletionKind::Snippet,
);
expect.assert_eq(&actual);
}
#[test]
fn test_record_literal_field_default() {
let test_code = r#"
struct S { foo: u32, bar: usize }
impl core::default::Default for S {
fn default() -> Self {
S {
foo: 0,
bar: 0,
}
}
}
fn process(f: S) {
let other = S {
foo: 5,
.<|>
};
}
"#;
check(
test_code,
expect![[r#"
fd bar usize
"#]],
);
check_snippet(
test_code,
expect![[r#"
fd ..Default::default()
sn pd
sn ppd
"#]],
);
}
#[test]
fn test_record_literal_field_without_default() {
let test_code = r#"
struct S { foo: u32, bar: usize }
fn process(f: S) {
let other = S {
foo: 5,
.<|>
};
}
"#;
check(
test_code,
expect![[r#"
fd bar usize
"#]],
);
check_snippet(
test_code,
expect![[r#"
sn pd
sn ppd
"#]],
);
}
#[test]
fn test_record_pattern_field() {
check(
r#"
struct S { foo: u32 }
fn process(f: S) {
match f {
S { f<|>: 92 } => (),
}
}
"#,
expect![[r#"
fd foo u32
"#]],
);
}
#[test]
fn test_record_pattern_enum_variant() {
check(
r#"
enum E { S { foo: u32, bar: () } }
fn process(e: E) {
match e {
E::S { <|> } => (),
}
}
"#,
expect![[r#"
fd bar ()
fd foo u32
"#]],
);
}
#[test]
fn test_record_pattern_field_in_simple_macro() {
check(
r"
macro_rules! m { ($e:expr) => { $e } }
struct S { foo: u32 }
fn process(f: S) {
m!(match f {
S { f<|>: 92 } => (),
})
}
",
expect![[r#"
fd foo u32
"#]],
);
}
#[test]
fn only_missing_fields_are_completed_in_destruct_pats() {
check(
r#"
struct S {
foo1: u32, foo2: u32,
bar: u32, baz: u32,
}
fn main() {
let s = S {
foo1: 1, foo2: 2,
bar: 3, baz: 4,
};
if let S { foo1, foo2: a, <|> } = s {}
}
"#,
expect![[r#"
fd bar u32
fd baz u32
"#]],
);
}
#[test]
fn test_record_literal_field() {
check(
r#"
struct A { the_field: u32 }
fn foo() {
A { the<|> }
}
"#,
expect![[r#"
fd the_field u32
"#]],
);
}
#[test]
fn test_record_literal_enum_variant() {
check(
r#"
enum E { A { a: u32 } }
fn foo() {
let _ = E::A { <|> }
}
"#,
expect![[r#"
fd a u32
"#]],
);
}
#[test]
fn test_record_literal_two_structs() {
check(
r#"
struct A { a: u32 }
struct B { b: u32 }
fn foo() {
let _: A = B { <|> }
}
"#,
expect![[r#"
fd b u32
"#]],
);
}
#[test]
fn test_record_literal_generic_struct() {
check(
r#"
struct A<T> { a: T }
fn foo() {
let _: A<u32> = A { <|> }
}
"#,
expect![[r#"
fd a u32
"#]],
);
}
#[test]
fn test_record_literal_field_in_simple_macro() {
check(
r#"
macro_rules! m { ($e:expr) => { $e } }
struct A { the_field: u32 }
fn foo() {
m!(A { the<|> })
}
"#,
expect![[r#"
fd the_field u32
"#]],
);
}
#[test]
fn only_missing_fields_are_completed() {
check(
r#"
struct S {
foo1: u32, foo2: u32,
bar: u32, baz: u32,
}
fn main() {
let foo1 = 1;
let s = S { foo1, foo2: 5, <|> }
}
"#,
expect![[r#"
fd bar u32
fd baz u32
"#]],
);
}
#[test]
fn completes_functional_update() {
check(
r#"
struct S { foo1: u32, foo2: u32 }
fn main() {
let foo1 = 1;
let s = S { foo1, <|> .. loop {} }
}
"#,
expect![[r#"
fd foo2 u32
"#]],
);
}
}
|
