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|
use ast::FieldList;
use syntax::ast::{self, AstNode, GenericParamsOwner, NameOwner, RefType, Type};
use crate::{AssistContext, AssistId, AssistKind, Assists};
// Assist: add_lifetime_to_type
//
// Adds a new lifetime to a struct, enum or union.
//
// ```
// struct Point {
// x: &$0u32,
// y: u32,
// }
// ```
// ->
// ```
// struct Point<'a> {
// x: &'a u32,
// y: u32,
// }
// ```
pub(crate) fn add_lifetime_to_type(acc: &mut Assists, ctx: &AssistContext) -> Option<()> {
let ref_type_focused = ctx.find_node_at_offset::<ast::RefType>()?;
if ref_type_focused.lifetime().is_some() {
return None;
}
let node = ctx.find_node_at_offset::<ast::Adt>()?;
let has_lifetime = node
.generic_param_list()
.map(|gen_list| gen_list.lifetime_params().count() > 0)
.unwrap_or_default();
if has_lifetime {
return None;
}
let ref_types = fetch_borrowed_types(&node)?;
let target = node.syntax().text_range();
acc.add(
AssistId("add_lifetime_to_type", AssistKind::Generate),
"Add lifetime`",
target,
|builder| {
match node.generic_param_list() {
Some(gen_param) => {
if let Some(left_angle) = gen_param.l_angle_token() {
builder.insert(left_angle.text_range().end(), "'a, ");
}
}
None => {
if let Some(name) = node.name() {
builder.insert(name.syntax().text_range().end(), "<'a>");
}
}
}
for ref_type in ref_types {
if let Some(amp_token) = ref_type.amp_token() {
builder.insert(amp_token.text_range().end(), "'a ");
}
}
},
)
}
fn fetch_borrowed_types(node: &ast::Adt) -> Option<Vec<RefType>> {
let ref_types: Vec<RefType> = match node {
ast::Adt::Enum(enum_) => {
let variant_list = enum_.variant_list()?;
variant_list
.variants()
.filter_map(|variant| {
let field_list = variant.field_list()?;
find_ref_types_from_field_list(&field_list)
})
.flatten()
.collect()
}
ast::Adt::Struct(strukt) => {
let field_list = strukt.field_list()?;
find_ref_types_from_field_list(&field_list)?
}
ast::Adt::Union(un) => {
let record_field_list = un.record_field_list()?;
record_field_list
.fields()
.filter_map(|r_field| {
if let Type::RefType(ref_type) = r_field.ty()? {
if ref_type.lifetime().is_none() {
return Some(ref_type);
}
}
None
})
.collect()
}
};
if ref_types.is_empty() {
None
} else {
Some(ref_types)
}
}
fn find_ref_types_from_field_list(field_list: &FieldList) -> Option<Vec<RefType>> {
let ref_types: Vec<RefType> = match field_list {
ast::FieldList::RecordFieldList(record_list) => record_list
.fields()
.filter_map(|f| {
if let Type::RefType(ref_type) = f.ty()? {
if ref_type.lifetime().is_none() {
return Some(ref_type);
}
}
None
})
.collect(),
ast::FieldList::TupleFieldList(tuple_field_list) => tuple_field_list
.fields()
.filter_map(|f| {
if let Type::RefType(ref_type) = f.ty()? {
if ref_type.lifetime().is_none() {
return Some(ref_type);
}
}
None
})
.collect(),
};
if ref_types.is_empty() {
None
} else {
Some(ref_types)
}
}
#[cfg(test)]
mod tests {
use crate::tests::{check_assist, check_assist_not_applicable};
use super::*;
#[test]
fn add_lifetime_to_struct() {
check_assist(
add_lifetime_to_type,
"struct Foo { a: &$0i32 }",
"struct Foo<'a> { a: &'a i32 }",
);
check_assist(
add_lifetime_to_type,
"struct Foo { a: &$0i32, b: &usize }",
"struct Foo<'a> { a: &'a i32, b: &'a usize }",
);
check_assist(
add_lifetime_to_type,
"struct Foo { a: &$0i32, b: usize }",
"struct Foo<'a> { a: &'a i32, b: usize }",
);
check_assist(
add_lifetime_to_type,
"struct Foo<T> { a: &$0T, b: usize }",
"struct Foo<'a, T> { a: &'a T, b: usize }",
);
check_assist_not_applicable(add_lifetime_to_type, "struct Foo<'a> { a: &$0'a i32 }");
check_assist_not_applicable(add_lifetime_to_type, "struct Foo { a: &'a$0 i32 }");
}
#[test]
fn add_lifetime_to_enum() {
check_assist(
add_lifetime_to_type,
"enum Foo { Bar { a: i32 }, Other, Tuple(u32, &$0u32)}",
"enum Foo<'a> { Bar { a: i32 }, Other, Tuple(u32, &'a u32)}",
);
check_assist(
add_lifetime_to_type,
"enum Foo { Bar { a: &$0i32 }}",
"enum Foo<'a> { Bar { a: &'a i32 }}",
);
check_assist(
add_lifetime_to_type,
"enum Foo<T> { Bar { a: &$0i32, b: &T }}",
"enum Foo<'a, T> { Bar { a: &'a i32, b: &'a T }}",
);
check_assist_not_applicable(add_lifetime_to_type, "enum Foo<'a> { Bar { a: &$0'a i32 }}");
check_assist_not_applicable(add_lifetime_to_type, "enum Foo { Bar, $0Misc }");
}
#[test]
fn add_lifetime_to_union() {
check_assist(
add_lifetime_to_type,
"union Foo { a: &$0i32 }",
"union Foo<'a> { a: &'a i32 }",
);
check_assist(
add_lifetime_to_type,
"union Foo { a: &$0i32, b: &usize }",
"union Foo<'a> { a: &'a i32, b: &'a usize }",
);
check_assist(
add_lifetime_to_type,
"union Foo<T> { a: &$0T, b: usize }",
"union Foo<'a, T> { a: &'a T, b: usize }",
);
check_assist_not_applicable(add_lifetime_to_type, "struct Foo<'a> { a: &'a $0i32 }");
}
}
|
