78 lines
2.4 KiB
Rust
78 lines
2.4 KiB
Rust
use format_buf::format;
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use hir::db::HirDatabase;
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use join_to_string::join;
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use ra_syntax::{
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ast::{self, AstNode, NameOwner, TypeParamsOwner},
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TextUnit,
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};
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use crate::{Assist, AssistCtx, AssistId};
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pub(crate) fn add_impl(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
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let nominal = ctx.node_at_offset::<ast::NominalDef>()?;
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let name = nominal.name()?;
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ctx.add_action(AssistId("add_impl"), "add impl", |edit| {
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edit.target(nominal.syntax().text_range());
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let type_params = nominal.type_param_list();
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let start_offset = nominal.syntax().text_range().end();
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let mut buf = String::new();
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buf.push_str("\n\nimpl");
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if let Some(type_params) = &type_params {
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format!(buf, "{}", type_params.syntax());
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}
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buf.push_str(" ");
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buf.push_str(name.text().as_str());
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if let Some(type_params) = type_params {
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let lifetime_params = type_params
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.lifetime_params()
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.filter_map(|it| it.lifetime_token())
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.map(|it| it.text().clone());
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let type_params =
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type_params.type_params().filter_map(|it| it.name()).map(|it| it.text().clone());
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join(lifetime_params.chain(type_params)).surround_with("<", ">").to_buf(&mut buf);
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}
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buf.push_str(" {\n");
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edit.set_cursor(start_offset + TextUnit::of_str(&buf));
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buf.push_str("\n}");
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edit.insert(start_offset, buf);
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});
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ctx.build()
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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, check_assist_target};
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#[test]
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fn test_add_impl() {
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check_assist(add_impl, "struct Foo {<|>}\n", "struct Foo {}\n\nimpl Foo {\n<|>\n}\n");
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check_assist(
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add_impl,
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"struct Foo<T: Clone> {<|>}",
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"struct Foo<T: Clone> {}\n\nimpl<T: Clone> Foo<T> {\n<|>\n}",
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);
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check_assist(
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add_impl,
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"struct Foo<'a, T: Foo<'a>> {<|>}",
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"struct Foo<'a, T: Foo<'a>> {}\n\nimpl<'a, T: Foo<'a>> Foo<'a, T> {\n<|>\n}",
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);
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}
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#[test]
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fn add_impl_target() {
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check_assist_target(
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add_impl,
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"
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struct SomeThingIrrelevant;
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/// Has a lifetime parameter
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struct Foo<'a, T: Foo<'a>> {<|>}
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struct EvenMoreIrrelevant;
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",
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"/// Has a lifetime parameter
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struct Foo<'a, T: Foo<'a>> {}",
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);
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}
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}
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