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|
//! Renderer for `enum` variants.
use hir::{HasAttrs, HirDisplay, ModPath, StructKind};
use itertools::Itertools;
use test_utils::mark;
use crate::{
item::{CompletionItem, CompletionItemKind, CompletionKind, ImportEdit},
render::{builder_ext::Params, RenderContext},
};
pub(crate) fn render_variant<'a>(
ctx: RenderContext<'a>,
import_to_add: Option<ImportEdit>,
local_name: Option<String>,
variant: hir::Variant,
path: Option<ModPath>,
) -> CompletionItem {
let _p = profile::span("render_enum_variant");
EnumRender::new(ctx, local_name, variant, path).render(import_to_add)
}
#[derive(Debug)]
struct EnumRender<'a> {
ctx: RenderContext<'a>,
name: String,
variant: hir::Variant,
path: Option<ModPath>,
qualified_name: String,
short_qualified_name: String,
variant_kind: StructKind,
}
impl<'a> EnumRender<'a> {
fn new(
ctx: RenderContext<'a>,
local_name: Option<String>,
variant: hir::Variant,
path: Option<ModPath>,
) -> EnumRender<'a> {
let name = local_name.unwrap_or_else(|| variant.name(ctx.db()).to_string());
let variant_kind = variant.kind(ctx.db());
let (qualified_name, short_qualified_name) = match &path {
Some(path) => {
let full = path.to_string();
let short =
path.segments[path.segments.len().saturating_sub(2)..].iter().join("::");
(full, short)
}
None => (name.to_string(), name.to_string()),
};
EnumRender { ctx, name, variant, path, qualified_name, short_qualified_name, variant_kind }
}
fn render(self, import_to_add: Option<ImportEdit>) -> CompletionItem {
let mut builder = CompletionItem::new(
CompletionKind::Reference,
self.ctx.source_range(),
self.qualified_name.clone(),
)
.kind(CompletionItemKind::EnumVariant)
.set_documentation(self.variant.docs(self.ctx.db()))
.set_deprecated(self.ctx.is_deprecated(self.variant))
.add_import(import_to_add)
.detail(self.detail());
if self.variant_kind == StructKind::Tuple {
mark::hit!(inserts_parens_for_tuple_enums);
let params = Params::Anonymous(self.variant.fields(self.ctx.db()).len());
builder =
builder.add_call_parens(self.ctx.completion, self.short_qualified_name, params);
} else if self.path.is_some() {
builder = builder.lookup_by(self.short_qualified_name);
}
builder.build()
}
fn detail(&self) -> String {
let detail_types = self
.variant
.fields(self.ctx.db())
.into_iter()
.map(|field| (field.name(self.ctx.db()), field.signature_ty(self.ctx.db())));
match self.variant_kind {
StructKind::Tuple | StructKind::Unit => format!(
"({})",
detail_types.map(|(_, t)| t.display(self.ctx.db()).to_string()).format(", ")
),
StructKind::Record => format!(
"{{ {} }}",
detail_types
.map(|(n, t)| format!("{}: {}", n, t.display(self.ctx.db()).to_string()))
.format(", ")
),
}
}
}
#[cfg(test)]
mod tests {
use test_utils::mark;
use crate::test_utils::check_edit;
#[test]
fn inserts_parens_for_tuple_enums() {
mark::check!(inserts_parens_for_tuple_enums);
check_edit(
"Some",
r#"
enum Option<T> { Some(T), None }
use Option::*;
fn main() -> Option<i32> {
Som<|>
}
"#,
r#"
enum Option<T> { Some(T), None }
use Option::*;
fn main() -> Option<i32> {
Some($0)
}
"#,
);
}
}
|
