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-rw-r--r--crates/completion/src/render/builder_ext.rs94
1 files changed, 94 insertions, 0 deletions
diff --git a/crates/completion/src/render/builder_ext.rs b/crates/completion/src/render/builder_ext.rs
new file mode 100644
index 000000000..37b0d0459
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+++ b/crates/completion/src/render/builder_ext.rs
@@ -0,0 +1,94 @@
1//! Extensions for `Builder` structure required for item rendering.
2
3use itertools::Itertools;
4use test_utils::mark;
5
6use crate::{item::Builder, CompletionContext};
7
8pub(super) enum Params {
9 Named(Vec<String>),
10 Anonymous(usize),
11}
12
13impl Params {
14 pub(super) fn len(&self) -> usize {
15 match self {
16 Params::Named(xs) => xs.len(),
17 Params::Anonymous(len) => *len,
18 }
19 }
20
21 pub(super) fn is_empty(&self) -> bool {
22 self.len() == 0
23 }
24}
25
26impl Builder {
27 pub(super) fn should_add_parems(&self, ctx: &CompletionContext) -> bool {
28 if !ctx.config.add_call_parenthesis {
29 return false;
30 }
31 if ctx.use_item_syntax.is_some() {
32 mark::hit!(no_parens_in_use_item);
33 return false;
34 }
35 if ctx.is_pattern_call {
36 mark::hit!(dont_duplicate_pattern_parens);
37 return false;
38 }
39 if ctx.is_call {
40 return false;
41 }
42
43 // Don't add parentheses if the expected type is some function reference.
44 if let Some(ty) = &ctx.expected_type {
45 if ty.is_fn() {
46 mark::hit!(no_call_parens_if_fn_ptr_needed);
47 return false;
48 }
49 }
50
51 // Nothing prevents us from adding parentheses
52 true
53 }
54
55 pub(super) fn add_call_parens(
56 mut self,
57 ctx: &CompletionContext,
58 name: String,
59 params: Params,
60 ) -> Builder {
61 if !self.should_add_parems(ctx) {
62 return self;
63 }
64
65 let cap = match ctx.config.snippet_cap {
66 Some(it) => it,
67 None => return self,
68 };
69 // If not an import, add parenthesis automatically.
70 mark::hit!(inserts_parens_for_function_calls);
71
72 let (snippet, label) = if params.is_empty() {
73 (format!("{}()$0", name), format!("{}()", name))
74 } else {
75 self = self.trigger_call_info();
76 let snippet = match (ctx.config.add_call_argument_snippets, params) {
77 (true, Params::Named(params)) => {
78 let function_params_snippet =
79 params.iter().enumerate().format_with(", ", |(index, param_name), f| {
80 f(&format_args!("${{{}:{}}}", index + 1, param_name))
81 });
82 format!("{}({})$0", name, function_params_snippet)
83 }
84 _ => {
85 mark::hit!(suppress_arg_snippets);
86 format!("{}($0)", name)
87 }
88 };
89
90 (snippet, format!("{}(…)", name))
91 };
92 self.lookup_by(name).label(label).insert_snippet(cap, snippet)
93 }
94}