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|
use ra_syntax::{
algo::visit::{visitor_ctx, VisitorCtx},
ast,
AstNode,
};
use rustc_hash::FxHashMap;
use crate::completion::{CompletionContext, Completions, CompletionKind, CompletionItem};
/// Complete repeated parametes, both name and type. For example, if all
/// functions in a file have a `spam: &mut Spam` parameter, a completion with
/// `spam: &mut Spam` insert text/label and `spam` lookup string will be
/// suggested.
pub(super) fn complete_fn_param(acc: &mut Completions, ctx: &CompletionContext) {
if !ctx.is_param {
return;
}
let mut params = FxHashMap::default();
for node in ctx.leaf.ancestors() {
let _ = visitor_ctx(&mut params)
.visit::<ast::SourceFile, _>(process)
.visit::<ast::ItemList, _>(process)
.accept(node);
}
params
.into_iter()
.filter_map(|(label, (count, param))| {
let lookup = param.pat()?.syntax().text().to_string();
if count < 2 {
None
} else {
Some((label, lookup))
}
})
.for_each(|(label, lookup)| {
CompletionItem::new(CompletionKind::Magic, label)
.lookup_by(lookup)
.add_to(acc)
});
fn process<'a, N: ast::FnDefOwner>(
node: &'a N,
params: &mut FxHashMap<String, (u32, &'a ast::Param)>,
) {
node.functions()
.filter_map(|it| it.param_list())
.flat_map(|it| it.params())
.for_each(|param| {
let text = param.syntax().text().to_string();
params.entry(text).or_insert((0, param)).0 += 1;
})
}
}
#[cfg(test)]
mod tests {
use crate::completion::*;
fn check_magic_completion(code: &str, expected_completions: &str) {
check_completion(code, expected_completions, CompletionKind::Magic);
}
#[test]
fn test_param_completion_last_param() {
check_magic_completion(
r"
fn foo(file_id: FileId) {}
fn bar(file_id: FileId) {}
fn baz(file<|>) {}
",
r#"file_id "file_id: FileId""#,
);
}
#[test]
fn test_param_completion_nth_param() {
check_magic_completion(
r"
fn foo(file_id: FileId) {}
fn bar(file_id: FileId) {}
fn baz(file<|>, x: i32) {}
",
r#"file_id "file_id: FileId""#,
);
}
#[test]
fn test_param_completion_trait_param() {
check_magic_completion(
r"
pub(crate) trait SourceRoot {
pub fn contains(&self, file_id: FileId) -> bool;
pub fn module_map(&self) -> &ModuleMap;
pub fn lines(&self, file_id: FileId) -> &LineIndex;
pub fn syntax(&self, file<|>)
}
",
r#"file_id "file_id: FileId""#,
);
}
}
|
