1 //! Renderer for patterns.
3 use hir::{db::HirDatabase, HasAttrs, HasVisibility, Name, StructKind};
4 use ide_db::helpers::SnippetCap;
5 use itertools::Itertools;
7 use crate::{item::CompletionKind, render::RenderContext, CompletionItem, CompletionItemKind};
9 pub(crate) fn render_struct_pat(
10 ctx: RenderContext<'_>,
12 local_name: Option<Name>,
13 ) -> Option<CompletionItem> {
14 let _p = profile::span("render_struct_pat");
16 let fields = strukt.fields(ctx.db());
17 let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, strukt)?;
19 if visible_fields.is_empty() {
20 // Matching a struct without matching its fields is pointless, unlike matching a Variant without its fields
24 let name = local_name.unwrap_or_else(|| strukt.name(ctx.db())).to_string();
25 let pat = render_pat(&ctx, &name, strukt.kind(ctx.db()), &visible_fields, fields_omitted)?;
27 Some(build_completion(ctx, name, pat, strukt))
30 pub(crate) fn render_variant_pat(
31 ctx: RenderContext<'_>,
32 variant: hir::Variant,
33 local_name: Option<Name>,
34 path: Option<hir::ModPath>,
35 ) -> Option<CompletionItem> {
36 let _p = profile::span("render_variant_pat");
38 let fields = variant.fields(ctx.db());
39 let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, variant)?;
41 let name = match &path {
42 Some(path) => path.to_string(),
43 None => local_name.unwrap_or_else(|| variant.name(ctx.db())).to_string(),
45 let pat = render_pat(&ctx, &name, variant.kind(ctx.db()), &visible_fields, fields_omitted)?;
47 Some(build_completion(ctx, name, pat, variant))
51 ctx: RenderContext<'_>,
54 def: impl HasAttrs + Copy,
56 let mut item = CompletionItem::new(CompletionKind::Snippet, ctx.source_range(), name);
57 item.kind(CompletionItemKind::Binding)
58 .set_documentation(ctx.docs(def))
59 .set_deprecated(ctx.is_deprecated(def))
61 if let Some(snippet_cap) = ctx.snippet_cap() {
62 item.insert_snippet(snippet_cap, pat);
64 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)
86 if ctx.completion.is_param {
91 if ctx.snippet_cap().is_some() {
97 fn render_record_as_pat(
99 snippet_cap: Option<SnippetCap>,
100 fields: &[hir::Field],
102 fields_omitted: bool,
104 let fields = fields.iter();
105 if snippet_cap.is_some() {
110 .map(|(idx, field)| format!("{}${}", field.name(db), idx + 1))
112 if fields_omitted { ", .." } else { "" },
118 fields.map(|field| field.name(db)).format(", "),
119 if fields_omitted { ", .." } else { "" },
125 fn render_tuple_as_pat(fields: &[hir::Field], name: &str, fields_omitted: bool) -> String {
128 fields.iter().enumerate().map(|(idx, _)| format!("${}", idx + 1)).format(", "),
129 if fields_omitted { ", .." } else { "" },
135 ctx: &RenderContext<'_>,
136 fields: &[hir::Field],
138 ) -> Option<(Vec<hir::Field>, bool)> {
139 let module = ctx.completion.scope.module()?;
140 let n_fields = fields.len();
143 .filter(|field| field.is_visible_from(ctx.db(), module))
145 .collect::<Vec<_>>();
148 n_fields - fields.len() > 0 || item.attrs(ctx.db()).by_key("non_exhaustive").exists();
149 Some((fields, fields_omitted))