4 AdtDef, Ty, FieldSource, source_binder,
7 use ra_syntax::ast::{self, AstNode};
9 use crate::{AssistCtx, Assist};
11 pub(crate) fn fill_match_arms(mut ctx: AssistCtx<impl HirDatabase>) -> Option<Assist> {
12 let match_expr = ctx.node_at_offset::<ast::MatchExpr>()?;
14 // We already have some match arms, so we don't provide any assists.
15 match match_expr.match_arm_list() {
16 Some(arm_list) if arm_list.arms().count() > 0 => {
22 let expr = match_expr.expr()?;
24 source_binder::function_from_child_node(ctx.db, ctx.frange.file_id, expr.syntax())?;
25 let infer_result = function.infer(ctx.db);
26 let syntax_mapping = function.body_syntax_mapping(ctx.db);
27 let node_expr = syntax_mapping.node_expr(expr)?;
28 let match_expr_ty = infer_result[node_expr].clone();
29 let enum_def = match match_expr_ty {
30 Ty::Adt { def_id: AdtDef::Enum(e), .. } => e,
33 let enum_name = enum_def.name(ctx.db)?;
36 ctx.add_action("fill match arms", |edit| {
37 let mut buf = format!("match {} {{\n", expr.syntax().text().to_string());
38 let variants = enum_def.variants(db);
39 for variant in variants {
40 let name = match variant.name(db) {
44 write!(&mut buf, " {}::{}", enum_name, name.to_string()).unwrap();
50 let name = field.name(db).to_string();
51 let (_, source) = field.source(db);
53 FieldSource::Named(_) => name,
54 FieldSource::Pos(_) => "_".to_string(),
59 match pat.first().map(|s| s.as_str()) {
60 Some("_") => write!(&mut buf, "({})", pat.join(", ")).unwrap(),
61 Some(_) => write!(&mut buf, "{{{}}}", pat.join(", ")).unwrap(),
65 buf.push_str(" => (),\n");
68 edit.target(match_expr.syntax().range());
69 edit.set_cursor(expr.syntax().range().start());
70 edit.replace_node_and_indent(match_expr.syntax(), buf);
78 use crate::helpers::{check_assist, check_assist_target};
80 use super::fill_match_arms;
83 fn fill_match_arms_empty_body() {
92 Es{x: usize, y: usize}
106 Es{x: usize, y: usize}
123 fn fill_match_arms_no_body() {
147 fn fill_match_arms_target() {