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|
use std::fmt::Write;
use hir::{AdtDef, Ty, db::HirDatabase, source_binder::function_from_child_node};
use ra_syntax::ast::{self, AstNode};
use crate::{AssistCtx, Assist, AssistId};
pub(crate) fn fill_struct_fields(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
let struct_lit = ctx.node_at_offset::<ast::StructLit>()?;
let mut fsf = FillStructFields {
ctx: &mut ctx,
named_field_list: struct_lit.named_field_list()?,
struct_fields: vec![],
struct_lit,
};
fsf.evaluate_struct_def_fields()?;
if fsf.struct_lit_and_def_have_the_same_number_of_fields() {
return None;
}
fsf.remove_already_included_fields()?;
fsf.add_action()?;
ctx.build()
}
struct FillStructFields<'a, 'b: 'a, DB> {
ctx: &'a mut AssistCtx<'b, DB>,
named_field_list: &'a ast::NamedFieldList,
struct_fields: Vec<(String, String)>,
struct_lit: &'a ast::StructLit,
}
impl<DB> FillStructFields<'_, '_, DB>
where
DB: HirDatabase,
{
fn add_action(&mut self) -> Option<()> {
let named_field_list = self.named_field_list;
let struct_fields_string = self.struct_fields_string()?;
let struct_lit = self.struct_lit;
self.ctx.add_action(AssistId("fill_struct_fields"), "fill struct fields", |edit| {
edit.target(struct_lit.syntax().range());
edit.set_cursor(struct_lit.syntax().range().start());
edit.replace_node_and_indent(named_field_list.syntax(), struct_fields_string);
});
Some(())
}
fn struct_lit_and_def_have_the_same_number_of_fields(&self) -> bool {
self.named_field_list.fields().count() == self.struct_fields.len()
}
fn evaluate_struct_def_fields(&mut self) -> Option<()> {
let function = function_from_child_node(
self.ctx.db,
self.ctx.frange.file_id,
self.struct_lit.syntax(),
)?;
let infer_result = function.infer(self.ctx.db);
let source_map = function.body_source_map(self.ctx.db);
let node_expr = source_map.node_expr(self.struct_lit.into())?;
let struct_lit_ty = infer_result[node_expr].clone();
let struct_def = match struct_lit_ty {
Ty::Adt { def_id: AdtDef::Struct(s), .. } => s,
_ => return None,
};
self.struct_fields = struct_def
.fields(self.ctx.db)
.into_iter()
.map(|f| (f.name(self.ctx.db).to_string(), "()".into()))
.collect();
Some(())
}
fn remove_already_included_fields(&mut self) -> Option<()> {
for ast_field in self.named_field_list.fields() {
let expr = ast_field.expr()?.syntax().text().to_string();
let name_from_ast = ast_field.name_ref()?.text().to_string();
if let Some(idx) = self.struct_fields.iter().position(|(n, _)| n == &name_from_ast) {
self.struct_fields[idx] = (name_from_ast, expr);
}
}
Some(())
}
fn struct_fields_string(&mut self) -> Option<String> {
let mut buf = String::from("{\n");
for (name, expr) in &self.struct_fields {
write!(&mut buf, " {}: {},\n", name, expr).unwrap();
}
buf.push_str("}");
Some(buf)
}
}
#[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 {
a: (),
b: (),
c: (1, 2),
d: (),
e: "foo",
}
}
"#,
);
}
}
|
