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|
use syntax::ast::{self, AstNode};
use crate::{AssistContext, AssistId, AssistKind, Assists};
// Assist: extract_type_alias
//
// Extracts the selected type as a type alias.
//
// ```
// struct S {
// field: $0(u8, u8, u8)$0,
// }
// ```
// ->
// ```
// type $0Type = (u8, u8, u8);
//
// struct S {
// field: Type,
// }
// ```
pub(crate) fn extract_type_alias(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
if ctx.frange.range.is_empty() {
return None;
}
let node = ctx.find_node_at_range::<ast::Type>()?;
let insert = ctx
.find_node_at_offset::<ast::Impl>()
.map(|imp| imp.syntax().clone())
.or_else(|| ctx.find_node_at_offset::<ast::Item>().map(|item| item.syntax().clone()))?
.text_range()
.start();
let target = node.syntax().text_range();
acc.add(
AssistId("extract_type_alias", AssistKind::RefactorExtract),
"Extract type as type alias",
target,
|builder| {
builder.edit_file(ctx.frange.file_id);
builder.replace(target, "Type");
match ctx.config.snippet_cap {
Some(cap) => {
builder.insert_snippet(cap, insert, format!("type $0Type = {};\n\n", node));
}
None => {
builder.insert(insert, format!("type Type = {};\n\n", node));
}
}
},
)
}
#[cfg(test)]
mod tests {
use crate::tests::{check_assist, check_assist_not_applicable};
use super::*;
#[test]
fn test_not_applicable_without_selection() {
check_assist_not_applicable(
extract_type_alias,
r"
struct S {
field: $0(u8, u8, u8),
}
",
);
}
#[test]
fn test_simple_types() {
check_assist(
extract_type_alias,
r"
struct S {
field: $0u8$0,
}
",
r#"
type $0Type = u8;
struct S {
field: Type,
}
"#,
);
}
#[test]
fn test_generic_type_arg() {
check_assist(
extract_type_alias,
r"
fn generic<T>() {}
fn f() {
generic::<$0()$0>();
}
",
r#"
fn generic<T>() {}
type $0Type = ();
fn f() {
generic::<Type>();
}
"#,
);
}
#[test]
fn test_inner_type_arg() {
check_assist(
extract_type_alias,
r"
struct Vec<T> {}
struct S {
v: Vec<Vec<$0Vec<u8>$0>>,
}
",
r#"
struct Vec<T> {}
type $0Type = Vec<u8>;
struct S {
v: Vec<Vec<Type>>,
}
"#,
);
}
#[test]
fn test_extract_inner_type() {
check_assist(
extract_type_alias,
r"
struct S {
field: ($0u8$0,),
}
",
r#"
type $0Type = u8;
struct S {
field: (Type,),
}
"#,
);
}
#[test]
fn extract_from_impl() {
// When invoked in an impl, extracted type alias should be placed next to the impl, not
// inside.
check_assist(
extract_type_alias,
r#"
impl S {
fn f() -> $0(u8, u8)$0 {}
}
"#,
r#"
type $0Type = (u8, u8);
impl S {
fn f() -> Type {}
}
"#,
);
}
}
|
