1 //! Renderer for patterns.
3 use hir::{db::HirDatabase, HasAttrs, HasVisibility, Name, StructKind};
4 use ide_db::helpers::SnippetCap;
5 use itertools::Itertools;
8 context::{ParamKind, PatternContext},
10 CompletionItem, CompletionItemKind,
13 pub(crate) fn render_struct_pat(
14 ctx: RenderContext<'_>,
16 local_name: Option<Name>,
17 ) -> Option<CompletionItem> {
18 let _p = profile::span("render_struct_pat");
20 let fields = strukt.fields(ctx.db());
21 let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, strukt)?;
23 if visible_fields.is_empty() {
24 // Matching a struct without matching its fields is pointless, unlike matching a Variant without its fields
28 let name = local_name.unwrap_or_else(|| strukt.name(ctx.db())).to_string();
29 let pat = render_pat(&ctx, &name, strukt.kind(ctx.db()), &visible_fields, fields_omitted)?;
31 Some(build_completion(ctx, name, pat, strukt))
34 pub(crate) fn render_variant_pat(
35 ctx: RenderContext<'_>,
36 variant: hir::Variant,
37 local_name: Option<Name>,
38 path: Option<hir::ModPath>,
39 ) -> Option<CompletionItem> {
40 let _p = profile::span("render_variant_pat");
42 let fields = variant.fields(ctx.db());
43 let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, variant)?;
45 let name = match &path {
46 Some(path) => path.to_string(),
47 None => local_name.unwrap_or_else(|| variant.name(ctx.db())).to_string(),
49 let pat = render_pat(&ctx, &name, variant.kind(ctx.db()), &visible_fields, fields_omitted)?;
51 Some(build_completion(ctx, name, pat, variant))
55 ctx: RenderContext<'_>,
58 def: impl HasAttrs + Copy,
60 let mut item = CompletionItem::new(CompletionItemKind::Binding, ctx.source_range(), name);
61 item.set_documentation(ctx.docs(def)).set_deprecated(ctx.is_deprecated(def)).detail(&pat);
62 match ctx.snippet_cap() {
63 Some(snippet_cap) => item.insert_snippet(snippet_cap, pat),
64 None => item.insert_text(pat),
70 ctx: &RenderContext<'_>,
73 fields: &[hir::Field],
76 let mut pat = match kind {
77 StructKind::Tuple if ctx.snippet_cap().is_some() => {
78 render_tuple_as_pat(fields, name, fields_omitted)
80 StructKind::Record => {
81 render_record_as_pat(ctx.db(), ctx.snippet_cap(), fields, name, fields_omitted)
87 ctx.completion.pattern_ctx,
88 Some(PatternContext { is_param: Some(ParamKind::Function), .. })
94 if ctx.snippet_cap().is_some() {
100 fn render_record_as_pat(
101 db: &dyn HirDatabase,
102 snippet_cap: Option<SnippetCap>,
103 fields: &[hir::Field],
105 fields_omitted: bool,
107 let fields = fields.iter();
108 if snippet_cap.is_some() {
113 .map(|(idx, field)| format!("{}${}", field.name(db), idx + 1))
115 if fields_omitted { ", .." } else { "" },
121 fields.map(|field| field.name(db)).format(", "),
122 if fields_omitted { ", .." } else { "" },
128 fn render_tuple_as_pat(fields: &[hir::Field], name: &str, fields_omitted: bool) -> String {
131 fields.iter().enumerate().map(|(idx, _)| format!("${}", idx + 1)).format(", "),
132 if fields_omitted { ", .." } else { "" },
138 ctx: &RenderContext<'_>,
139 fields: &[hir::Field],
141 ) -> Option<(Vec<hir::Field>, bool)> {
142 let module = ctx.completion.scope.module()?;
143 let n_fields = fields.len();
146 .filter(|field| field.is_visible_from(ctx.db(), module))
148 .collect::<Vec<_>>();
151 n_fields - fields.len() > 0 || item.attrs(ctx.db()).by_key("non_exhaustive").exists();
152 Some((fields, fields_omitted))