1 //! Postfix completions, like `Ok(10).ifl$0` => `if let Ok() = Ok(10) { $0 }`.
6 helpers::{FamousDefs, SnippetCap},
10 ast::{self, AstNode, AstToken},
11 SyntaxKind::{BLOCK_EXPR, EXPR_STMT},
14 use text_edit::TextEdit;
17 completions::postfix::format_like::add_format_like_completions,
18 context::CompletionContext,
19 item::{Builder, CompletionKind},
20 patterns::ImmediateLocation,
21 CompletionItem, CompletionItemKind, CompletionRelevance, Completions,
24 pub(crate) fn complete_postfix(acc: &mut Completions, ctx: &CompletionContext) {
25 if !ctx.config.enable_postfix_completions {
29 let (dot_receiver, receiver_is_ambiguous_float_literal) = match &ctx.completion_location {
30 Some(ImmediateLocation::MethodCall { receiver: Some(it), .. }) => (it, false),
31 Some(ImmediateLocation::FieldAccess {
33 receiver_is_ambiguous_float_literal,
34 }) => (it, *receiver_is_ambiguous_float_literal),
38 let receiver_text = get_receiver_text(dot_receiver, receiver_is_ambiguous_float_literal);
40 let receiver_ty = match ctx.sema.type_of_expr(dot_receiver) {
45 // Suggest .await syntax for types that implement Future trait
46 if receiver_ty.impls_future(ctx.db) {
47 let mut item = CompletionItem::new(CompletionKind::Keyword, ctx.source_range(), "await");
48 item.kind(CompletionItemKind::Keyword).detail("expr.await");
52 let cap = match ctx.config.snippet_cap {
56 let try_enum = TryEnum::from_ty(&ctx.sema, &receiver_ty.strip_references());
57 if let Some(try_enum) = &try_enum {
66 &format!("if let Ok($1) = {} {{\n $0\n}}", receiver_text),
76 &format!("while let Ok($1) = {} {{\n $0\n}}", receiver_text),
87 &format!("if let Some($1) = {} {{\n $0\n}}", receiver_text),
97 &format!("while let Some($1) = {} {{\n $0\n}}", receiver_text),
102 } else if receiver_ty.is_bool() || receiver_ty.is_unknown() {
109 &format!("if {} {{\n $0\n}}", receiver_text),
118 &format!("while {} {{\n $0\n}}", receiver_text),
121 postfix_snippet(ctx, cap, dot_receiver, "not", "!expr", &format!("!{}", receiver_text))
123 } else if let Some(trait_) = FamousDefs(&ctx.sema, ctx.krate).core_iter_IntoIterator() {
124 if receiver_ty.impls_trait(ctx.db, trait_, &[]) {
130 "for ele in expr {}",
131 &format!("for ele in {} {{\n $0\n}}", receiver_text),
137 postfix_snippet(ctx, cap, dot_receiver, "ref", "&expr", &format!("&{}", receiver_text))
145 &format!("&mut {}", receiver_text),
149 // The rest of the postfix completions create an expression that moves an argument,
150 // so it's better to consider references now to avoid breaking the compilation
151 let dot_receiver = include_references(dot_receiver);
152 let receiver_text = get_receiver_text(&dot_receiver, receiver_is_ambiguous_float_literal);
155 Some(try_enum) => match try_enum {
163 &format!("match {} {{\n Ok(${{1:_}}) => {{$2}},\n Err(${{3:_}}) => {{$0}},\n}}", receiver_text),
175 "match {} {{\n Some(${{1:_}}) => {{$2}},\n None => {{$0}},\n}}",
189 &format!("match {} {{\n ${{1:_}} => {{$0}},\n}}", receiver_text),
201 &format!("Box::new({})", receiver_text),
205 postfix_snippet(ctx, cap, &dot_receiver, "ok", "Ok(expr)", &format!("Ok({})", receiver_text))
214 &format!("Err({})", receiver_text),
224 &format!("Some({})", receiver_text),
234 &format!("dbg!({})", receiver_text),
244 &format!("dbg!(&{})", receiver_text),
254 &format!("${{1}}({})", receiver_text),
258 if let Some(parent) = dot_receiver.syntax().parent().and_then(|p| p.parent()) {
259 if matches!(parent.kind(), BLOCK_EXPR | EXPR_STMT) {
266 &format!("let $0 = {};", receiver_text),
275 &format!("let mut $0 = {};", receiver_text),
281 if let ast::Expr::Literal(literal) = dot_receiver.clone() {
282 if let Some(literal_text) = ast::String::cast(literal.token()) {
283 add_format_like_completions(acc, ctx, &dot_receiver, cap, &literal_text);
288 fn get_receiver_text(receiver: &ast::Expr, receiver_is_ambiguous_float_literal: bool) -> String {
289 if receiver_is_ambiguous_float_literal {
290 let text = receiver.syntax().text();
291 let without_dot = ..text.len() - TextSize::of('.');
292 text.slice(without_dot).to_string()
298 fn include_references(initial_element: &ast::Expr) -> ast::Expr {
299 let mut resulting_element = initial_element.clone();
300 while let Some(parent_ref_element) =
301 resulting_element.syntax().parent().and_then(ast::RefExpr::cast)
303 resulting_element = ast::Expr::from(parent_ref_element);
309 ctx: &CompletionContext,
311 receiver: &ast::Expr,
317 let receiver_syntax = receiver.syntax();
318 let receiver_range = ctx.sema.original_range(receiver_syntax).range;
319 let delete_range = TextRange::new(receiver_range.start(), ctx.source_range().end());
320 TextEdit::replace(delete_range, snippet.to_string())
322 let mut item = CompletionItem::new(CompletionKind::Postfix, ctx.source_range(), label);
323 item.detail(detail).kind(CompletionItemKind::Snippet).snippet_edit(cap, edit);
324 if ctx.original_token.text() == label {
325 let mut relevance = CompletionRelevance::default();
326 relevance.exact_postfix_snippet_match = true;
327 item.set_relevance(relevance);
335 use expect_test::{expect, Expect};
338 tests::{check_edit, filtered_completion_list},
342 fn check(ra_fixture: &str, expect: Expect) {
343 let actual = filtered_completion_list(ra_fixture, CompletionKind::Postfix);
344 expect.assert_eq(&actual)
348 fn postfix_completion_works_for_trivial_path_expression() {
358 sn while while expr {}
362 sn match match expr {}
363 sn box Box::new(expr)
369 sn call function(expr)
377 fn postfix_completion_works_for_function_calln() {
380 fn foo(elt: bool) -> bool {
391 sn while while expr {}
395 sn match match expr {}
396 sn box Box::new(expr)
402 sn call function(expr)
408 fn postfix_type_filtering() {
419 sn match match expr {}
420 sn box Box::new(expr)
426 sn call function(expr)
434 fn let_middle_block() {
444 sn while while expr {}
448 sn match match expr {}
449 sn box Box::new(expr)
455 sn call function(expr)
469 let bar = Some(true);
475 let bar = Some(true);
476 if let Some($1) = bar {
508 fn postfix_completion_works_for_ambiguous_float_literal() {
509 check_edit("refm", r#"fn main() { 42.$0 }"#, r#"fn main() { &mut 42 }"#)
513 fn works_in_simple_macro() {
517 macro_rules! m { ($e:expr) => { $e } }
524 macro_rules! m { ($e:expr) => { $e } }
534 fn postfix_completion_for_references() {
535 check_edit("dbg", r#"fn main() { &&42.$0 }"#, r#"fn main() { dbg!(&&42) }"#);
536 check_edit("refm", r#"fn main() { &&42.$0 }"#, r#"fn main() { &&&mut 42 }"#);
542 let bar = &Some(true);
548 let bar = &Some(true);
549 if let Some($1) = bar {
558 fn postfix_completion_for_format_like_strings() {
561 r#"fn main() { "{some_var:?}".$0 }"#,
562 r#"fn main() { format!("{:?}", some_var) }"#,
566 r#"fn main() { "Panic with {a}".$0 }"#,
567 r#"fn main() { panic!("Panic with {}", a) }"#,
571 r#"fn main() { "{ 2+2 } { SomeStruct { val: 1, other: 32 } :?}".$0 }"#,
572 r#"fn main() { println!("{} {:?}", 2+2, SomeStruct { val: 1, other: 32 }) }"#,
576 r#"fn main() { "{2+2}".$0 }"#,
577 r#"fn main() { log::error!("{}", 2+2) }"#,
581 r#"fn main() { "{2+2}".$0 }"#,
582 r#"fn main() { log::trace!("{}", 2+2) }"#,
586 r#"fn main() { "{2+2}".$0 }"#,
587 r#"fn main() { log::debug!("{}", 2+2) }"#,
589 check_edit("logi", r#"fn main() { "{2+2}".$0 }"#, r#"fn main() { log::info!("{}", 2+2) }"#);
590 check_edit("logw", r#"fn main() { "{2+2}".$0 }"#, r#"fn main() { log::warn!("{}", 2+2) }"#);
593 r#"fn main() { "{2+2}".$0 }"#,
594 r#"fn main() { log::error!("{}", 2+2) }"#,