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-rw-r--r--crates/ra_ide/src/completion/complete_postfix.rs140
1 files changed, 123 insertions, 17 deletions
diff --git a/crates/ra_ide/src/completion/complete_postfix.rs b/crates/ra_ide/src/completion/complete_postfix.rs
index 0ba382165..0a00054b2 100644
--- a/crates/ra_ide/src/completion/complete_postfix.rs
+++ b/crates/ra_ide/src/completion/complete_postfix.rs
@@ -1,6 +1,9 @@
1//! FIXME: write short doc here 1//! FIXME: write short doc here
2 2
3use ra_syntax::{ast::AstNode, TextRange, TextUnit}; 3use ra_syntax::{
4 ast::{self, AstNode},
5 TextRange, TextUnit,
6};
4use ra_text_edit::TextEdit; 7use ra_text_edit::TextEdit;
5 8
6use crate::{ 9use crate::{
@@ -21,13 +24,8 @@ pub(super) fn complete_postfix(acc: &mut Completions, ctx: &CompletionContext) {
21 None => return, 24 None => return,
22 }; 25 };
23 26
24 let receiver_text = if ctx.dot_receiver_is_ambiguous_float_literal { 27 let receiver_text =
25 let text = dot_receiver.syntax().text(); 28 get_receiver_text(dot_receiver, ctx.dot_receiver_is_ambiguous_float_literal);
26 let without_dot = ..text.len() - TextUnit::of_char('.');
27 text.slice(without_dot).to_string()
28 } else {
29 dot_receiver.syntax().text().to_string()
30 };
31 29
32 let receiver_ty = match ctx.sema.type_of_expr(&dot_receiver) { 30 let receiver_ty = match ctx.sema.type_of_expr(&dot_receiver) {
33 Some(it) => it, 31 Some(it) => it,
@@ -35,10 +33,17 @@ pub(super) fn complete_postfix(acc: &mut Completions, ctx: &CompletionContext) {
35 }; 33 };
36 34
37 if receiver_ty.is_bool() || receiver_ty.is_unknown() { 35 if receiver_ty.is_bool() || receiver_ty.is_unknown() {
38 postfix_snippet(ctx, "if", "if expr {}", &format!("if {} {{$0}}", receiver_text))
39 .add_to(acc);
40 postfix_snippet( 36 postfix_snippet(
41 ctx, 37 ctx,
38 &dot_receiver,
39 "if",
40 "if expr {}",
41 &format!("if {} {{$0}}", receiver_text),
42 )
43 .add_to(acc);
44 postfix_snippet(
45 ctx,
46 &dot_receiver,
42 "while", 47 "while",
43 "while expr {}", 48 "while expr {}",
44 &format!("while {} {{\n$0\n}}", receiver_text), 49 &format!("while {} {{\n$0\n}}", receiver_text),
@@ -46,28 +51,70 @@ pub(super) fn complete_postfix(acc: &mut Completions, ctx: &CompletionContext) {
46 .add_to(acc); 51 .add_to(acc);
47 } 52 }
48 53
49 postfix_snippet(ctx, "not", "!expr", &format!("!{}", receiver_text)).add_to(acc); 54 // !&&&42 is a compiler error, ergo process it before considering the references
55 postfix_snippet(ctx, &dot_receiver, "not", "!expr", &format!("!{}", receiver_text)).add_to(acc);
50 56
51 postfix_snippet(ctx, "ref", "&expr", &format!("&{}", receiver_text)).add_to(acc); 57 postfix_snippet(ctx, &dot_receiver, "ref", "&expr", &format!("&{}", receiver_text)).add_to(acc);
52 postfix_snippet(ctx, "refm", "&mut expr", &format!("&mut {}", receiver_text)).add_to(acc); 58 postfix_snippet(ctx, &dot_receiver, "refm", "&mut expr", &format!("&mut {}", receiver_text))
59 .add_to(acc);
60
61 // The rest of the postfix completions create an expression that moves an argument,
62 // so it's better to consider references now to avoid breaking the compilation
63 let dot_receiver = include_references(dot_receiver);
64 let receiver_text =
65 get_receiver_text(&dot_receiver, ctx.dot_receiver_is_ambiguous_float_literal);
53 66
54 postfix_snippet( 67 postfix_snippet(
55 ctx, 68 ctx,
69 &dot_receiver,
56 "match", 70 "match",
57 "match expr {}", 71 "match expr {}",
58 &format!("match {} {{\n ${{1:_}} => {{$0\\}},\n}}", receiver_text), 72 &format!("match {} {{\n ${{1:_}} => {{$0\\}},\n}}", receiver_text),
59 ) 73 )
60 .add_to(acc); 74 .add_to(acc);
61 75
62 postfix_snippet(ctx, "dbg", "dbg!(expr)", &format!("dbg!({})", receiver_text)).add_to(acc); 76 postfix_snippet(
77 ctx,
78 &dot_receiver,
79 "box",
80 "Box::new(expr)",
81 &format!("Box::new({})", receiver_text),
82 )
83 .add_to(acc);
63 84
64 postfix_snippet(ctx, "box", "Box::new(expr)", &format!("Box::new({})", receiver_text)) 85 postfix_snippet(ctx, &dot_receiver, "dbg", "dbg!(expr)", &format!("dbg!({})", receiver_text))
65 .add_to(acc); 86 .add_to(acc);
66} 87}
67 88
68fn postfix_snippet(ctx: &CompletionContext, label: &str, detail: &str, snippet: &str) -> Builder { 89fn get_receiver_text(receiver: &ast::Expr, receiver_is_ambiguous_float_literal: bool) -> String {
90 if receiver_is_ambiguous_float_literal {
91 let text = receiver.syntax().text();
92 let without_dot = ..text.len() - TextUnit::of_char('.');
93 text.slice(without_dot).to_string()
94 } else {
95 receiver.to_string()
96 }
97}
98
99fn include_references(initial_element: &ast::Expr) -> ast::Expr {
100 let mut resulting_element = initial_element.clone();
101 while let Some(parent_ref_element) =
102 resulting_element.syntax().parent().and_then(ast::RefExpr::cast)
103 {
104 resulting_element = ast::Expr::from(parent_ref_element);
105 }
106 resulting_element
107}
108
109fn postfix_snippet(
110 ctx: &CompletionContext,
111 receiver: &ast::Expr,
112 label: &str,
113 detail: &str,
114 snippet: &str,
115) -> Builder {
69 let edit = { 116 let edit = {
70 let receiver_syntax = ctx.dot_receiver.as_ref().expect("no receiver available").syntax(); 117 let receiver_syntax = receiver.syntax();
71 let receiver_range = ctx.sema.original_range(receiver_syntax).range; 118 let receiver_range = ctx.sema.original_range(receiver_syntax).range;
72 let delete_range = TextRange::from_to(receiver_range.start(), ctx.source_range().end()); 119 let delete_range = TextRange::from_to(receiver_range.start(), ctx.source_range().end());
73 TextEdit::replace(delete_range, snippet.to_string()) 120 TextEdit::replace(delete_range, snippet.to_string())
@@ -340,4 +387,63 @@ mod tests {
340 "### 387 "###
341 ); 388 );
342 } 389 }
390
391 #[test]
392 fn postfix_completion_for_references() {
393 assert_debug_snapshot!(
394 do_postfix_completion(
395 r#"
396 fn main() {
397 &&&&42.<|>
398 }
399 "#,
400 ),
401 @r###"
402 [
403 CompletionItem {
404 label: "box",
405 source_range: [56; 56),
406 delete: [49; 56),
407 insert: "Box::new(&&&&42)",
408 detail: "Box::new(expr)",
409 },
410 CompletionItem {
411 label: "dbg",
412 source_range: [56; 56),
413 delete: [49; 56),
414 insert: "dbg!(&&&&42)",
415 detail: "dbg!(expr)",
416 },
417 CompletionItem {
418 label: "match",
419 source_range: [56; 56),
420 delete: [49; 56),
421 insert: "match &&&&42 {\n ${1:_} => {$0\\},\n}",
422 detail: "match expr {}",
423 },
424 CompletionItem {
425 label: "not",
426 source_range: [56; 56),
427 delete: [53; 56),
428 insert: "!42",
429 detail: "!expr",
430 },
431 CompletionItem {
432 label: "ref",
433 source_range: [56; 56),
434 delete: [53; 56),
435 insert: "&42",
436 detail: "&expr",
437 },
438 CompletionItem {
439 label: "refm",
440 source_range: [56; 56),
441 delete: [53; 56),
442 insert: "&mut 42",
443 detail: "&mut expr",
444 },
445 ]
446 "###
447 );
448 }
343} 449}