135 lines
2.8 KiB
Rust
135 lines
2.8 KiB
Rust
use ra_ide_db::defs::{classify_name_ref, Definition, NameRefClass};
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use ra_syntax::{ast, AstNode, SyntaxKind, T};
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use crate::{
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assist_context::{AssistContext, Assists},
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AssistId,
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};
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use test_utils::tested_by;
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// Assist: add_turbo_fish
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//
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// Adds `::<_>` to a call of a generic method or function.
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//
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// ```
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// fn make<T>() -> T { todo!() }
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// fn main() {
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// let x = make<|>();
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// }
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// ```
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// ->
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// ```
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// fn make<T>() -> T { todo!() }
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// fn main() {
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// let x = make::<${0:_}>();
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// }
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// ```
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pub(crate) fn add_turbo_fish(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
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let ident = ctx.find_token_at_offset(SyntaxKind::IDENT)?;
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let next_token = ident.next_token()?;
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if next_token.kind() == T![::] {
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tested_by!(add_turbo_fish_one_fish_is_enough);
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return None;
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}
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let name_ref = ast::NameRef::cast(ident.parent())?;
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let def = match classify_name_ref(&ctx.sema, &name_ref)? {
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NameRefClass::Definition(def) => def,
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NameRefClass::FieldShorthand { .. } => return None,
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};
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let fun = match def {
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Definition::ModuleDef(hir::ModuleDef::Function(it)) => it,
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_ => return None,
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};
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let generics = hir::GenericDef::Function(fun).params(ctx.sema.db);
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if generics.is_empty() {
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tested_by!(add_turbo_fish_non_generic);
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return None;
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}
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acc.add(AssistId("add_turbo_fish"), "Add `::<>`", ident.text_range(), |builder| {
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match ctx.config.snippet_cap {
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Some(cap) => builder.insert_snippet(cap, ident.text_range().end(), "::<${0:_}>"),
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None => builder.insert(ident.text_range().end(), "::<_>"),
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}
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})
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}
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#[cfg(test)]
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mod tests {
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use crate::tests::{check_assist, check_assist_not_applicable};
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use super::*;
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use test_utils::covers;
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#[test]
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fn add_turbo_fish_function() {
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check_assist(
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add_turbo_fish,
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r#"
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fn make<T>() -> T {}
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fn main() {
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make<|>();
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}
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"#,
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r#"
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fn make<T>() -> T {}
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fn main() {
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make::<${0:_}>();
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}
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"#,
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);
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}
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#[test]
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fn add_turbo_fish_method() {
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check_assist(
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add_turbo_fish,
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r#"
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struct S;
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impl S {
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fn make<T>(&self) -> T {}
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}
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fn main() {
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S.make<|>();
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}
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"#,
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r#"
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struct S;
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impl S {
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fn make<T>(&self) -> T {}
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}
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fn main() {
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S.make::<${0:_}>();
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}
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"#,
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);
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}
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#[test]
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fn add_turbo_fish_one_fish_is_enough() {
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covers!(add_turbo_fish_one_fish_is_enough);
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check_assist_not_applicable(
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add_turbo_fish,
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r#"
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fn make<T>() -> T {}
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fn main() {
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make<|>::<()>();
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}
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"#,
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);
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}
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#[test]
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fn add_turbo_fish_non_generic() {
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covers!(add_turbo_fish_non_generic);
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check_assist_not_applicable(
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add_turbo_fish,
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r#"
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fn make() -> () {}
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fn main() {
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make<|>();
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}
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"#,
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);
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}
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}
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