85 lines
2.2 KiB
Rust
85 lines
2.2 KiB
Rust
use hir::db::HirDatabase;
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use ra_syntax::{
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ast::{self, AstNode, AttrsOwner},
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SyntaxKind::{WHITESPACE, COMMENT},
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TextUnit,
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};
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use crate::{AssistCtx, Assist};
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pub(crate) fn add_derive(ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
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let nominal = ctx.node_at_offset::<ast::NominalDef>()?;
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let node_start = derive_insertion_offset(nominal)?;
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ctx.build("add `#[derive]`", |edit| {
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let derive_attr = nominal
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.attrs()
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.filter_map(|x| x.as_call())
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.filter(|(name, _arg)| name == "derive")
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.map(|(_name, arg)| arg)
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.next();
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let offset = match derive_attr {
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None => {
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edit.insert(node_start, "#[derive()]\n");
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node_start + TextUnit::of_str("#[derive(")
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}
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Some(tt) => tt.syntax().range().end() - TextUnit::of_char(')'),
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};
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edit.set_cursor(offset)
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})
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}
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// Insert `derive` after doc comments.
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fn derive_insertion_offset(nominal: &ast::NominalDef) -> Option<TextUnit> {
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let non_ws_child = nominal
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.syntax()
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.children()
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.find(|it| it.kind() != COMMENT && it.kind() != WHITESPACE)?;
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Some(non_ws_child.range().start())
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::helpers::check_assist;
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#[test]
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fn add_derive_new() {
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check_assist(
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add_derive,
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"struct Foo { a: i32, <|>}",
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"#[derive(<|>)]\nstruct Foo { a: i32, }",
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);
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check_assist(
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add_derive,
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"struct Foo { <|> a: i32, }",
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"#[derive(<|>)]\nstruct Foo { a: i32, }",
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);
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}
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#[test]
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fn add_derive_existing() {
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check_assist(
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add_derive,
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"#[derive(Clone)]\nstruct Foo { a: i32<|>, }",
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"#[derive(Clone<|>)]\nstruct Foo { a: i32, }",
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);
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}
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#[test]
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fn add_derive_new_with_doc_comment() {
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check_assist(
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add_derive,
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"
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/// `Foo` is a pretty important struct.
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/// It does stuff.
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struct Foo { a: i32<|>, }
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",
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"
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/// `Foo` is a pretty important struct.
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/// It does stuff.
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#[derive(<|>)]
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struct Foo { a: i32, }
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",
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);
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}
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}
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