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|
use syntax::ast::{self, AstNode, NameOwner};
use crate::{utils::generate_impl_text, AssistContext, AssistId, AssistKind, Assists};
// Assist: generate_impl
//
// Adds a new inherent impl for a type.
//
// ```
// struct Ctx<T: Clone> {
// data: T,$0
// }
// ```
// ->
// ```
// struct Ctx<T: Clone> {
// data: T,
// }
//
// impl<T: Clone> Ctx<T> {
// $0
// }
// ```
pub(crate) fn generate_impl(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
let nominal = ctx.find_node_at_offset::<ast::Adt>()?;
let name = nominal.name()?;
let target = nominal.syntax().text_range();
acc.add(
AssistId("generate_impl", AssistKind::Generate),
format!("Generate impl for `{}`", name),
target,
|edit| {
let start_offset = nominal.syntax().text_range().end();
match ctx.config.snippet_cap {
Some(cap) => {
let snippet = generate_impl_text(&nominal, " $0");
edit.insert_snippet(cap, start_offset, snippet);
}
None => {
let snippet = generate_impl_text(&nominal, "");
edit.insert(start_offset, snippet);
}
}
},
)
}
#[cfg(test)]
mod tests {
use crate::tests::{check_assist, check_assist_target};
use super::*;
#[test]
fn test_add_impl() {
check_assist(
generate_impl,
"struct Foo {$0}\n",
"struct Foo {}\n\nimpl Foo {\n $0\n}\n",
);
check_assist(
generate_impl,
"struct Foo<T: Clone> {$0}",
"struct Foo<T: Clone> {}\n\nimpl<T: Clone> Foo<T> {\n $0\n}",
);
check_assist(
generate_impl,
"struct Foo<'a, T: Foo<'a>> {$0}",
"struct Foo<'a, T: Foo<'a>> {}\n\nimpl<'a, T: Foo<'a>> Foo<'a, T> {\n $0\n}",
);
check_assist(
generate_impl,
r#"
#[cfg(feature = "foo")]
struct Foo<'a, T: Foo<'a>> {$0}"#,
r#"
#[cfg(feature = "foo")]
struct Foo<'a, T: Foo<'a>> {}
#[cfg(feature = "foo")]
impl<'a, T: Foo<'a>> Foo<'a, T> {
$0
}"#,
);
check_assist(
generate_impl,
r#"
#[cfg(not(feature = "foo"))]
struct Foo<'a, T: Foo<'a>> {$0}"#,
r#"
#[cfg(not(feature = "foo"))]
struct Foo<'a, T: Foo<'a>> {}
#[cfg(not(feature = "foo"))]
impl<'a, T: Foo<'a>> Foo<'a, T> {
$0
}"#,
);
}
#[test]
fn add_impl_target() {
check_assist_target(
generate_impl,
"
struct SomeThingIrrelevant;
/// Has a lifetime parameter
struct Foo<'a, T: Foo<'a>> {$0}
struct EvenMoreIrrelevant;
",
"/// Has a lifetime parameter
struct Foo<'a, T: Foo<'a>> {}",
);
}
}
|
