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|
use syntax::{
ast::{self, AstNode},
SyntaxKind,
};
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 Type = (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 = match ctx.covering_element() {
syntax::NodeOrToken::Node(node) => node,
syntax::NodeOrToken::Token(tok) => tok.parent()?,
};
let range = node.text_range();
let mut type_like_node = None;
for node in node.ancestors() {
if node.text_range() != range {
break;
}
let kind = node.kind();
if ast::Type::can_cast(kind) || kind == SyntaxKind::TYPE_ARG {
type_like_node = Some(node);
break;
}
}
let node = type_like_node?;
let insert = ctx.find_node_at_offset::<ast::Item>()?.syntax().text_range().start();
let target = node.text_range();
acc.add(
AssistId("extract_type_alias", AssistKind::RefactorExtract),
"Extract type as type alias",
target,
|builder| {
builder.edit_file(ctx.frange.file_id);
// FIXME: add snippet support
builder.replace(target, "Type");
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 Type = 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 Type = ();
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 Type = 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 Type = u8;
struct S {
field: (Type,),
}
"#,
);
}
}
|
