116 lines
3.3 KiB
Rust
116 lines
3.3 KiB
Rust
//! Renderer for `struct` literal.
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use hir::{db::HirDatabase, HasAttrs, HasVisibility, Name, StructKind};
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use ide_db::helpers::SnippetCap;
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use itertools::Itertools;
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use crate::{item::CompletionKind, render::RenderContext, CompletionItem, CompletionItemKind};
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pub(crate) fn render_struct_literal(
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ctx: RenderContext<'_>,
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strukt: hir::Struct,
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local_name: Option<Name>,
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) -> Option<CompletionItem> {
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let _p = profile::span("render_struct_literal");
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let fields = strukt.fields(ctx.db());
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let (visible_fields, fields_omitted) = visible_fields(&ctx, &fields, strukt)?;
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if fields_omitted {
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// If some fields are private you can't make `struct` literal.
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return None;
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}
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let name = local_name.unwrap_or_else(|| strukt.name(ctx.db())).to_string();
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let literal = render_literal(&ctx, &name, strukt.kind(ctx.db()), &visible_fields)?;
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Some(build_completion(ctx, name, literal, strukt))
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}
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fn build_completion(
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ctx: RenderContext<'_>,
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name: String,
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literal: String,
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def: impl HasAttrs + Copy,
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) -> CompletionItem {
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let mut item = CompletionItem::new(CompletionKind::Snippet, ctx.source_range(), name + " {…}");
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item.kind(CompletionItemKind::Snippet)
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.set_documentation(ctx.docs(def))
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.set_deprecated(ctx.is_deprecated(def))
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.detail(&literal);
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match ctx.snippet_cap() {
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Some(snippet_cap) => item.insert_snippet(snippet_cap, literal),
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None => item.insert_text(literal),
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};
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item.build()
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}
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fn render_literal(
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ctx: &RenderContext<'_>,
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name: &str,
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kind: StructKind,
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fields: &[hir::Field],
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) -> Option<String> {
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let mut literal = match kind {
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StructKind::Tuple if ctx.snippet_cap().is_some() => render_tuple_as_literal(fields, name),
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StructKind::Record => render_record_as_literal(ctx.db(), ctx.snippet_cap(), fields, name),
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_ => return None,
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};
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if ctx.snippet_cap().is_some() {
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literal.push_str("$0");
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}
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Some(literal)
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}
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fn render_record_as_literal(
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db: &dyn HirDatabase,
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snippet_cap: Option<SnippetCap>,
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fields: &[hir::Field],
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name: &str,
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) -> String {
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let fields = fields.iter();
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if snippet_cap.is_some() {
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format!(
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"{name} {{ {} }}",
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fields
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.enumerate()
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.map(|(idx, field)| format!("{}: ${{{}:()}}", field.name(db), idx + 1))
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.format(", "),
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name = name
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)
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} else {
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format!(
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"{name} {{ {} }}",
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fields.map(|field| format!("{}: ()", field.name(db))).format(", "),
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name = name
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)
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}
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}
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fn render_tuple_as_literal(fields: &[hir::Field], name: &str) -> String {
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format!(
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"{name}({})",
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fields.iter().enumerate().map(|(idx, _)| format!("${}", idx + 1)).format(", "),
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name = name
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)
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}
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fn visible_fields(
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ctx: &RenderContext<'_>,
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fields: &[hir::Field],
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item: impl HasAttrs,
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) -> Option<(Vec<hir::Field>, bool)> {
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let module = ctx.completion.scope.module()?;
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let n_fields = fields.len();
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let fields = fields
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.iter()
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.filter(|field| field.is_visible_from(ctx.db(), module))
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.copied()
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.collect::<Vec<_>>();
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let fields_omitted =
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n_fields - fields.len() > 0 || item.attrs(ctx.db()).by_key("non_exhaustive").exists();
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Some((fields, fields_omitted))
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}
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