128 lines
3.1 KiB
Rust
128 lines
3.1 KiB
Rust
use ra_syntax::{
|
|
ast::{self, AstNode, AttrsOwner},
|
|
SyntaxKind::{COMMENT, WHITESPACE},
|
|
TextSize,
|
|
};
|
|
|
|
use crate::{AssistContext, AssistId, Assists};
|
|
|
|
// Assist: add_derive
|
|
//
|
|
// Adds a new `#[derive()]` clause to a struct or enum.
|
|
//
|
|
// ```
|
|
// struct Point {
|
|
// x: u32,
|
|
// y: u32,<|>
|
|
// }
|
|
// ```
|
|
// ->
|
|
// ```
|
|
// #[derive($0)]
|
|
// struct Point {
|
|
// x: u32,
|
|
// y: u32,
|
|
// }
|
|
// ```
|
|
pub(crate) fn add_derive(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
|
|
let cap = ctx.config.snippet_cap?;
|
|
let nominal = ctx.find_node_at_offset::<ast::NominalDef>()?;
|
|
let node_start = derive_insertion_offset(&nominal)?;
|
|
let target = nominal.syntax().text_range();
|
|
acc.add(AssistId("add_derive"), "Add `#[derive]`", target, |builder| {
|
|
let derive_attr = nominal
|
|
.attrs()
|
|
.filter_map(|x| x.as_simple_call())
|
|
.filter(|(name, _arg)| name == "derive")
|
|
.map(|(_name, arg)| arg)
|
|
.next();
|
|
match derive_attr {
|
|
None => {
|
|
builder.insert_snippet(cap, node_start, "#[derive($0)]\n");
|
|
}
|
|
Some(tt) => {
|
|
// Just move the cursor.
|
|
builder.insert_snippet(
|
|
cap,
|
|
tt.syntax().text_range().end() - TextSize::of(')'),
|
|
"$0",
|
|
)
|
|
}
|
|
};
|
|
})
|
|
}
|
|
|
|
// Insert `derive` after doc comments.
|
|
fn derive_insertion_offset(nominal: &ast::NominalDef) -> Option<TextSize> {
|
|
let non_ws_child = nominal
|
|
.syntax()
|
|
.children_with_tokens()
|
|
.find(|it| it.kind() != COMMENT && it.kind() != WHITESPACE)?;
|
|
Some(non_ws_child.text_range().start())
|
|
}
|
|
|
|
#[cfg(test)]
|
|
mod tests {
|
|
use crate::tests::{check_assist, check_assist_target};
|
|
|
|
use super::*;
|
|
|
|
#[test]
|
|
fn add_derive_new() {
|
|
check_assist(
|
|
add_derive,
|
|
"struct Foo { a: i32, <|>}",
|
|
"#[derive($0)]\nstruct Foo { a: i32, }",
|
|
);
|
|
check_assist(
|
|
add_derive,
|
|
"struct Foo { <|> a: i32, }",
|
|
"#[derive($0)]\nstruct Foo { a: i32, }",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn add_derive_existing() {
|
|
check_assist(
|
|
add_derive,
|
|
"#[derive(Clone)]\nstruct Foo { a: i32<|>, }",
|
|
"#[derive(Clone$0)]\nstruct Foo { a: i32, }",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn add_derive_new_with_doc_comment() {
|
|
check_assist(
|
|
add_derive,
|
|
"
|
|
/// `Foo` is a pretty important struct.
|
|
/// It does stuff.
|
|
struct Foo { a: i32<|>, }
|
|
",
|
|
"
|
|
/// `Foo` is a pretty important struct.
|
|
/// It does stuff.
|
|
#[derive($0)]
|
|
struct Foo { a: i32, }
|
|
",
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn add_derive_target() {
|
|
check_assist_target(
|
|
add_derive,
|
|
"
|
|
struct SomeThingIrrelevant;
|
|
/// `Foo` is a pretty important struct.
|
|
/// It does stuff.
|
|
struct Foo { a: i32<|>, }
|
|
struct EvenMoreIrrelevant;
|
|
",
|
|
"/// `Foo` is a pretty important struct.
|
|
/// It does stuff.
|
|
struct Foo { a: i32, }",
|
|
);
|
|
}
|
|
}
|