src/tools/rust-analyzer/crates/ide-completion/src/render/type_alias.rs

   1 //! Renderer for type aliases.
   2
   3 use hir::{AsAssocItem, HirDisplay};
   4 use ide_db::SymbolKind;
   5 use syntax::SmolStr;
   6
   7 use crate::{item::CompletionItem, render::RenderContext};
   8
   9 pub(crate) fn render_type_alias(
  10     ctx: RenderContext<'_>,
  11     type_alias: hir::TypeAlias,
  12 ) -> Option<CompletionItem> {
  13     let _p = profile::span("render_type_alias");
  14     render(ctx, type_alias, false)
  15 }
  16
  17 pub(crate) fn render_type_alias_with_eq(
  18     ctx: RenderContext<'_>,
  19     type_alias: hir::TypeAlias,
  20 ) -> Option<CompletionItem> {
  21     let _p = profile::span("render_type_alias_with_eq");
  22     render(ctx, type_alias, true)
  23 }
  24
  25 fn render(
  26     ctx: RenderContext<'_>,
  27     type_alias: hir::TypeAlias,
  28     with_eq: bool,
  29 ) -> Option<CompletionItem> {
  30     let db = ctx.db();
  31
  32     let name = type_alias.name(db);
  33     let (name, escaped_name) = if with_eq {
  34         (
  35             SmolStr::from_iter([&name.unescaped().to_smol_str(), " = "]),
  36             SmolStr::from_iter([&name.to_smol_str(), " = "]),
  37         )
  38     } else {
  39         (name.unescaped().to_smol_str(), name.to_smol_str())
  40     };
  41     let detail = type_alias.display(db).to_string();
  42
  43     let mut item = CompletionItem::new(SymbolKind::TypeAlias, ctx.source_range(), name.clone());
  44     item.set_documentation(ctx.docs(type_alias))
  45         .set_deprecated(ctx.is_deprecated(type_alias) || ctx.is_deprecated_assoc_item(type_alias))
  46         .detail(detail)
  47         .set_relevance(ctx.completion_relevance());
  48
  49     if let Some(actm) = type_alias.as_assoc_item(db) {
  50         if let Some(trt) = actm.containing_trait_or_trait_impl(db) {
  51             item.trait_name(trt.name(db).to_smol_str());
  52         }
  53     }
  54     item.insert_text(escaped_name);
  55
  56     Some(item.build())
  57 }