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//! Completion for representations.
use ide_db::SymbolKind;
use syntax::ast;
use crate::{context::CompletionContext, item::CompletionItem, Completions};
pub(super) fn complete_repr(
acc: &mut Completions,
ctx: &CompletionContext<'_>,
input: ast::TokenTree,
) {
if let Some(existing_reprs) = super::parse_comma_sep_expr(input) {
for &ReprCompletion { label, snippet, lookup, collides } in REPR_COMPLETIONS {
let repr_already_annotated = existing_reprs
.iter()
.filter_map(|expr| match expr {
ast::Expr::PathExpr(path) => path.path()?.as_single_name_ref(),
ast::Expr::CallExpr(call) => match call.expr()? {
ast::Expr::PathExpr(path) => path.path()?.as_single_name_ref(),
_ => None,
},
_ => None,
})
.any(|it| {
let text = it.text();
lookup.unwrap_or(label) == text || collides.contains(&text.as_str())
});
if repr_already_annotated {
continue;
}
let mut item = CompletionItem::new(SymbolKind::BuiltinAttr, ctx.source_range(), label);
if let Some(lookup) = lookup {
item.lookup_by(lookup);
}
if let Some((snippet, cap)) = snippet.zip(ctx.config.snippet_cap) {
item.insert_snippet(cap, snippet);
}
item.add_to(acc);
}
}
}
struct ReprCompletion {
label: &'static str,
snippet: Option<&'static str>,
lookup: Option<&'static str>,
collides: &'static [&'static str],
}
const fn attr(label: &'static str, collides: &'static [&'static str]) -> ReprCompletion {
ReprCompletion { label, snippet: None, lookup: None, collides }
}
#[rustfmt::skip]
const REPR_COMPLETIONS: &[ReprCompletion] = &[
ReprCompletion { label: "align($0)", snippet: Some("align($0)"), lookup: Some("align"), collides: &["transparent", "packed"] },
attr("packed", &["transparent", "align"]),
attr("transparent", &["C", "u8", "u16", "u32", "u64", "u128", "usize", "i8", "i16", "i32", "i64", "i128", "isize"]),
attr("C", &["transparent"]),
attr("u8", &["transparent", "u16", "u32", "u64", "u128", "usize", "i8", "i16", "i32", "i64", "i128", "isize"]),
attr("u16", &["transparent", "u8", "u32", "u64", "u128", "usize", "i8", "i16", "i32", "i64", "i128", "isize"]),
attr("u32", &["transparent", "u8", "u16", "u64", "u128", "usize", "i8", "i16", "i32", "i64", "i128", "isize"]),
attr("u64", &["transparent", "u8", "u16", "u32", "u128", "usize", "i8", "i16", "i32", "i64", "i128", "isize"]),
attr("u128", &["transparent", "u8", "u16", "u32", "u64", "usize", "i8", "i16", "i32", "i64", "i128", "isize"]),
attr("usize", &["transparent", "u8", "u16", "u32", "u64", "u128", "i8", "i16", "i32", "i64", "i128", "isize"]),
attr("i8", &["transparent", "u8", "u16", "u32", "u64", "u128", "usize", "i16", "i32", "i64", "i128", "isize"]),
attr("i16", &["transparent", "u8", "u16", "u32", "u64", "u128", "usize", "i8", "i32", "i64", "i128", "isize"]),
attr("i32", &["transparent", "u8", "u16", "u32", "u64", "u128", "usize", "i8", "i16", "i64", "i128", "isize"]),
attr("i64", &["transparent", "u8", "u16", "u32", "u64", "u128", "usize", "i8", "i16", "i32", "i128", "isize"]),
attr("i28", &["transparent", "u8", "u16", "u32", "u64", "u128", "usize", "i8", "i16", "i32", "i64", "isize"]),
attr("isize", &["transparent", "u8", "u16", "u32", "u64", "u128", "usize", "i8", "i16", "i32", "i64", "i128"]),
];
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