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|
use hir::{AdtDef, db::HirDatabase};
use ra_syntax::ast::{self, AstNode};
use crate::{AssistCtx, Assist, AssistId, ast_editor::{AstEditor, AstBuilder}};
pub(crate) fn fill_struct_fields(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
let struct_lit = ctx.node_at_offset::<ast::StructLit>()?;
let named_field_list = struct_lit.named_field_list()?;
// Collect all fields from struct definition
let mut fields = {
let analyzer =
hir::SourceAnalyzer::new(ctx.db, ctx.frange.file_id, struct_lit.syntax(), None);
let struct_lit_ty = analyzer.type_of(ctx.db, struct_lit.into())?;
let struct_def = match struct_lit_ty.as_adt() {
Some((AdtDef::Struct(s), _)) => s,
_ => return None,
};
struct_def.fields(ctx.db)
};
// Filter out existing fields
for ast_field in named_field_list.fields() {
let name_from_ast = ast_field.name_ref()?.text().to_string();
fields.retain(|field| field.name(ctx.db).to_string() != name_from_ast);
}
if fields.is_empty() {
return None;
}
let db = ctx.db;
ctx.add_action(AssistId("fill_struct_fields"), "fill struct fields", |edit| {
let mut ast_editor = AstEditor::new(named_field_list);
if named_field_list.fields().count() == 0 && fields.len() > 2 {
ast_editor.make_multiline();
};
for field in fields {
let field = AstBuilder::<ast::NamedField>::from_pieces(
&AstBuilder::<ast::NameRef>::new(&field.name(db).to_string()),
Some(&AstBuilder::<ast::Expr>::unit()),
);
ast_editor.append_field(&field);
}
edit.target(struct_lit.syntax().range());
edit.set_cursor(struct_lit.syntax().range().start());
ast_editor.into_text_edit(edit.text_edit_builder());
});
ctx.build()
}
#[cfg(test)]
mod tests {
use crate::helpers::{check_assist, check_assist_target};
use super::fill_struct_fields;
#[test]
fn fill_struct_fields_empty_body() {
check_assist(
fill_struct_fields,
r#"
struct S<'a, D> {
a: u32,
b: String,
c: (i32, i32),
d: D,
e: &'a str,
}
fn main() {
let s = S<|> {}
}
"#,
r#"
struct S<'a, D> {
a: u32,
b: String,
c: (i32, i32),
d: D,
e: &'a str,
}
fn main() {
let s = <|>S {
a: (),
b: (),
c: (),
d: (),
e: (),
}
}
"#,
);
}
#[test]
fn fill_struct_fields_target() {
check_assist_target(
fill_struct_fields,
r#"
struct S<'a, D> {
a: u32,
b: String,
c: (i32, i32),
d: D,
e: &'a str,
}
fn main() {
let s = S<|> {}
}
"#,
"S {}",
);
}
#[test]
fn fill_struct_fields_preserve_self() {
check_assist(
fill_struct_fields,
r#"
struct Foo {
foo: u8,
bar: String,
baz: i128,
}
impl Foo {
pub fn new() -> Self {
Self <|>{}
}
}
"#,
r#"
struct Foo {
foo: u8,
bar: String,
baz: i128,
}
impl Foo {
pub fn new() -> Self {
<|>Self {
foo: (),
bar: (),
baz: (),
}
}
}
"#,
);
}
#[test]
fn fill_struct_fields_partial() {
check_assist(
fill_struct_fields,
r#"
struct S<'a, D> {
a: u32,
b: String,
c: (i32, i32),
d: D,
e: &'a str,
}
fn main() {
let s = S {
c: (1, 2),
e: "foo",<|>
}
}
"#,
r#"
struct S<'a, D> {
a: u32,
b: String,
c: (i32, i32),
d: D,
e: &'a str,
}
fn main() {
let s = <|>S {
c: (1, 2),
e: "foo",
a: (),
b: (),
d: (),
}
}
"#,
);
}
#[test]
fn fill_struct_short() {
check_assist(
fill_struct_fields,
r#"
struct S {
foo: u32,
bar: String,
}
fn main() {
let s = S {<|> };
}
"#,
r#"
struct S {
foo: u32,
bar: String,
}
fn main() {
let s = <|>S { foo: (), bar: () };
}
"#,
);
}
}
|
