96 lines
3.2 KiB
Rust
96 lines
3.2 KiB
Rust
//! Code common to structs, unions, and enum variants.
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use crate::context::CompletionContext;
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use hir::{db::HirDatabase, HasAttrs, HasVisibility, HirDisplay, StructKind};
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use ide_db::SnippetCap;
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use itertools::Itertools;
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use syntax::SmolStr;
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/// A rendered struct, union, or enum variant, split into fields for actual
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/// auto-completion (`literal`, using `field: ()`) and display in the
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/// completions menu (`detail`, using `field: type`).
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pub(crate) struct RenderedLiteral {
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pub(crate) literal: String,
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pub(crate) detail: String,
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}
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/// Render a record type (or sub-type) to a `RenderedCompound`. Use `None` for
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/// the `name` argument for an anonymous type.
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pub(crate) fn render_record_lit(
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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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path: &str,
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) -> RenderedLiteral {
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let completions = fields.iter().enumerate().format_with(", ", |(idx, field), f| {
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if snippet_cap.is_some() {
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f(&format_args!("{}: ${{{}:()}}", field.name(db), idx + 1))
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} else {
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f(&format_args!("{}: ()", field.name(db)))
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}
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});
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let types = fields.iter().format_with(", ", |field, f| {
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f(&format_args!("{}: {}", field.name(db), field.ty(db).display(db)))
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});
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RenderedLiteral {
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literal: format!("{} {{ {} }}", path, completions),
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detail: format!("{} {{ {} }}", path, types),
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}
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}
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/// Render a tuple type (or sub-type) to a `RenderedCompound`. Use `None` for
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/// the `name` argument for an anonymous type.
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pub(crate) fn render_tuple_lit(
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db: &dyn HirDatabase,
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snippet_cap: Option<SnippetCap>,
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fields: &[hir::Field],
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path: &str,
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) -> RenderedLiteral {
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let completions = fields.iter().enumerate().format_with(", ", |(idx, _), f| {
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if snippet_cap.is_some() {
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f(&format_args!("${{{}:()}}", idx + 1))
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} else {
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f(&format_args!("()"))
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}
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});
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let types = fields.iter().format_with(", ", |field, f| f(&field.ty(db).display(db)));
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RenderedLiteral {
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literal: format!("{}({})", path, completions),
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detail: format!("{}({})", path, types),
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}
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}
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/// Find all the visible fields in a given list. Returns the list of visible
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/// fields, plus a boolean for whether the list is comprehensive (contains no
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/// private fields and its item is not marked `#[non_exhaustive]`).
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pub(crate) fn visible_fields(
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ctx: &CompletionContext,
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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.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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/// Format a struct, etc. literal option for display in the completions menu.
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pub(crate) fn format_literal_label(name: &str, kind: StructKind) -> SmolStr {
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match kind {
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StructKind::Tuple => SmolStr::from_iter([name, "(…)"]),
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StructKind::Record => SmolStr::from_iter([name, " {…}"]),
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StructKind::Unit => name.into(),
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}
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}
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