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};
10 ctx: &RenderContext<'_>,
11 fields: &[hir::Field],
13 ) -> Option<(Vec<hir::Field>, bool)> {
14 let module = ctx.completion.scope.module()?;
15 let n_fields = fields.len();
18 .filter(|field| field.is_visible_from(ctx.db(), module))
23 n_fields - fields.len() > 0 || item.attrs(ctx.db()).by_key("non_exhaustive").exists();
24 Some((fields, fields_omitted))
27 pub(crate) fn render_struct_pat(
28 ctx: RenderContext<'_>,
30 local_name: Option<Name>,
31 ) -> Option<CompletionItem> {
32 let _p = profile::span("render_struct_pat");
34 let fields = strukt.fields(ctx.db());
35 let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, strukt)?;
37 if visible_fields.is_empty() {
38 // Matching a struct without matching its fields is pointless, unlike matching a Variant without its fields
42 let name = local_name.unwrap_or_else(|| strukt.name(ctx.db())).to_string();
43 let pat = render_pat(&ctx, &name, strukt.kind(ctx.db()), &visible_fields, fields_omitted)?;
45 Some(build_completion(ctx, name, pat, strukt))
48 pub(crate) fn render_variant_pat(
49 ctx: RenderContext<'_>,
50 variant: hir::Variant,
51 local_name: Option<Name>,
52 path: Option<hir::ModPath>,
53 ) -> Option<CompletionItem> {
54 let _p = profile::span("render_variant_pat");
56 let fields = variant.fields(ctx.db());
57 let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, variant)?;
59 let name = match &path {
60 Some(path) => path.to_string(),
61 None => local_name.unwrap_or_else(|| variant.name(ctx.db())).to_string(),
63 let pat = render_pat(&ctx, &name, variant.kind(ctx.db()), &visible_fields, fields_omitted)?;
65 Some(build_completion(ctx, name, pat, variant))
69 ctx: RenderContext<'_>,
72 item: impl HasAttrs + Copy,
74 let completion = CompletionItem::new(CompletionKind::Snippet, ctx.source_range(), name)
75 .kind(CompletionItemKind::Binding)
76 .set_documentation(ctx.docs(item))
77 .set_deprecated(ctx.is_deprecated(item))
79 let completion = if let Some(snippet_cap) = ctx.snippet_cap() {
80 completion.insert_snippet(snippet_cap, pat)
82 completion.insert_text(pat)
88 ctx: &RenderContext<'_>,
91 fields: &[hir::Field],
94 let mut pat = match kind {
95 StructKind::Tuple if ctx.snippet_cap().is_some() => {
96 render_tuple_as_pat(&fields, &name, fields_omitted)
98 StructKind::Record => {
99 render_record_as_pat(ctx.db(), ctx.snippet_cap(), &fields, &name, fields_omitted)
104 if ctx.completion.is_param {
109 if ctx.snippet_cap().is_some() {
115 fn render_record_as_pat(
116 db: &dyn HirDatabase,
117 snippet_cap: Option<SnippetCap>,
118 fields: &[hir::Field],
120 fields_omitted: bool,
122 let fields = fields.iter();
123 if snippet_cap.is_some() {
128 .map(|(idx, field)| format!("{}${}", field.name(db), idx + 1))
130 if fields_omitted { ", .." } else { "" },
136 fields.map(|field| field.name(db)).format(", "),
137 if fields_omitted { ", .." } else { "" },
143 fn render_tuple_as_pat(fields: &[hir::Field], name: &str, fields_omitted: bool) -> String {
146 fields.iter().enumerate().map(|(idx, _)| format!("${}", idx + 1)).format(", "),
147 if fields_omitted { ", .." } else { "" },