1 //! Renderer for macro invocations.
4 use ide_db::SymbolKind;
5 use syntax::display::macro_label;
9 item::{CompletionItem, CompletionKind, ImportEdit},
10 render::RenderContext,
13 pub(crate) fn render_macro(
14 ctx: RenderContext<'_>,
15 import_to_add: Option<ImportEdit>,
17 macro_: hir::MacroDef,
18 ) -> Option<CompletionItem> {
19 let _p = profile::span("render_macro");
20 MacroRender::new(ctx, name, macro_).render(import_to_add)
24 struct MacroRender<'a> {
25 ctx: RenderContext<'a>,
27 macro_: hir::MacroDef,
28 docs: Option<hir::Documentation>,
33 impl<'a> MacroRender<'a> {
34 fn new(ctx: RenderContext<'a>, name: hir::Name, macro_: hir::MacroDef) -> MacroRender<'a> {
35 let name = name.to_string();
36 let docs = ctx.docs(macro_);
37 let docs_str = docs.as_ref().map_or("", |s| s.as_str());
38 let (bra, ket) = guess_macro_braces(&name, docs_str);
40 MacroRender { ctx, name, macro_, docs, bra, ket }
43 fn render(&self, import_to_add: Option<ImportEdit>) -> Option<CompletionItem> {
45 CompletionItem::new(CompletionKind::Reference, self.ctx.source_range(), &self.label());
46 item.kind(SymbolKind::Macro)
47 .set_documentation(self.docs.clone())
48 .set_deprecated(self.ctx.is_deprecated(self.macro_))
49 .add_import(import_to_add)
50 .set_detail(self.detail());
52 let needs_bang = !(self.ctx.completion.in_use_tree()
53 || matches!(self.ctx.completion.path_call_kind(), Some(CallKind::Mac)));
54 let has_parens = self.ctx.completion.path_call_kind().is_some();
56 match self.ctx.snippet_cap() {
57 Some(cap) if needs_bang && !has_parens => {
58 let snippet = format!("{}!{}$0{}", self.name, self.bra, self.ket);
59 let lookup = self.banged_name();
60 item.insert_snippet(cap, snippet).lookup_by(lookup);
63 let lookup = self.banged_name();
64 item.insert_text(self.banged_name()).lookup_by(lookup);
67 cov_mark::hit!(dont_insert_macro_call_parens_unncessary);
68 item.insert_text(&self.name);
75 fn needs_bang(&self) -> bool {
76 !self.ctx.completion.in_use_tree()
77 && !matches!(self.ctx.completion.path_call_kind(), Some(CallKind::Mac))
80 fn label(&self) -> String {
81 if self.needs_bang() && self.ctx.snippet_cap().is_some() {
82 format!("{}!{}…{}", self.name, self.bra, self.ket)
83 } else if self.macro_.kind() == hir::MacroKind::Derive {
90 fn banged_name(&self) -> String {
91 format!("{}!", self.name)
94 fn detail(&self) -> Option<String> {
95 let ast_node = self.macro_.source(self.ctx.db())?.value.left()?;
96 Some(macro_label(&ast_node))
100 fn guess_macro_braces(macro_name: &str, docs: &str) -> (&'static str, &'static str) {
101 let mut votes = [0, 0, 0];
102 for (idx, s) in docs.match_indices(¯o_name) {
103 let (before, after) = (&docs[..idx], &docs[idx + s.len()..]);
104 // Ensure to match the full word
105 if after.starts_with('!')
106 && !before.ends_with(|c: char| c == '_' || c.is_ascii_alphanumeric())
108 // It may have spaces before the braces like `foo! {}`
109 match after[1..].chars().find(|&c| !c.is_whitespace()) {
110 Some('{') => votes[0] += 1,
111 Some('[') => votes[1] += 1,
112 Some('(') => votes[2] += 1,
118 // Insert a space before `{}`.
119 // We prefer the last one when some votes equal.
120 let (_vote, (bra, ket)) = votes
122 .zip(&[(" {", "}"), ("[", "]"), ("(", ")")])
123 .max_by_key(|&(&vote, _)| vote)
130 use crate::tests::check_edit;
133 fn dont_insert_macro_call_parens_unncessary() {
134 cov_mark::check!(dont_insert_macro_call_parens_unncessary);
138 //- /main.rs crate:main deps:foo
140 //- /foo/lib.rs crate:foo
142 macro_rules! frobnicate { () => () }
152 macro_rules! frobnicate { () => () }
153 fn main() { frob$0!(); }
156 macro_rules! frobnicate { () => () }
157 fn main() { frobnicate!(); }
163 fn add_bang_to_parens() {
167 macro_rules! frobnicate { () => () }
173 macro_rules! frobnicate { () => () }
182 fn guesses_macro_braces() {
186 /// Creates a [`Vec`] containing the arguments.
189 /// let v = vec![1, 2, 3];
190 /// assert_eq!(v[0], 1);
191 /// assert_eq!(v[1], 2);
192 /// assert_eq!(v[2], 3);
194 macro_rules! vec { () => {} }
199 /// Creates a [`Vec`] containing the arguments.
202 /// let v = vec![1, 2, 3];
203 /// assert_eq!(v[0], 1);
204 /// assert_eq!(v[1], 2);
205 /// assert_eq!(v[2], 3);
207 macro_rules! vec { () => {} }
209 fn main() { vec![$0] }
218 /// Don't call `fooo!()` `fooo!()`, or `_foo![]` `_foo![]`,
219 /// call as `let _=foo! { hello world };`
220 macro_rules! foo { () => {} }
226 /// Don't call `fooo!()` `fooo!()`, or `_foo![]` `_foo![]`,
227 /// call as `let _=foo! { hello world };`
228 macro_rules! foo { () => {} }
229 fn main() { foo! {$0} }