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|
use syntax::{
ast::{self, AstNode, HasAttrs},
SyntaxKind::{COMMENT, WHITESPACE},
TextSize,
};
use crate::{AssistContext, AssistId, AssistKind, Assists};
// Assist: generate_derive
//
// Adds a new `#[derive()]` clause to a struct or enum.
//
// ```
// struct Point {
// x: u32,
// y: u32,$0
// }
// ```
// ->
// ```
// #[derive($0)]
// struct Point {
// x: u32,
// y: u32,
// }
// ```
pub(crate) fn generate_derive(acc: &mut Assists, ctx: &AssistContext<'_>) -> Option<()> {
let cap = ctx.config.snippet_cap?;
let nominal = ctx.find_node_at_offset::<ast::Adt>()?;
let node_start = derive_insertion_offset(&nominal)?;
let target = nominal.syntax().text_range();
acc.add(
AssistId("generate_derive", AssistKind::Generate),
"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::Adt) -> 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(
generate_derive,
"struct Foo { a: i32, $0}",
"#[derive($0)]\nstruct Foo { a: i32, }",
);
check_assist(
generate_derive,
"struct Foo { $0 a: i32, }",
"#[derive($0)]\nstruct Foo { a: i32, }",
);
}
#[test]
fn add_derive_existing() {
check_assist(
generate_derive,
"#[derive(Clone)]\nstruct Foo { a: i32$0, }",
"#[derive(Clone$0)]\nstruct Foo { a: i32, }",
);
}
#[test]
fn add_derive_new_with_doc_comment() {
check_assist(
generate_derive,
"
/// `Foo` is a pretty important struct.
/// It does stuff.
struct Foo { a: i32$0, }
",
"
/// `Foo` is a pretty important struct.
/// It does stuff.
#[derive($0)]
struct Foo { a: i32, }
",
);
}
#[test]
fn add_derive_target() {
check_assist_target(
generate_derive,
"
struct SomeThingIrrelevant;
/// `Foo` is a pretty important struct.
/// It does stuff.
struct Foo { a: i32$0, }
struct EvenMoreIrrelevant;
",
"/// `Foo` is a pretty important struct.
/// It does stuff.
struct Foo { a: i32, }",
);
}
}
|
