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|
//! See `complete_fn_param`.
use rustc_hash::FxHashMap;
use syntax::{
ast::{self, ModuleItemOwner},
match_ast, AstNode,
};
use crate::completion::{CompletionContext, CompletionItem, CompletionKind, Completions};
/// Complete repeated parameters, 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();
let me = ctx.token.ancestors().find_map(ast::Fn::cast);
let mut process_fn = |func: ast::Fn| {
if Some(&func) == me.as_ref() {
return;
}
func.param_list().into_iter().flat_map(|it| it.params()).for_each(|param| {
let text = param.syntax().text().to_string();
params.entry(text).or_insert(param);
})
};
for node in ctx.token.parent().ancestors() {
match_ast! {
match node {
ast::SourceFile(it) => it.items().filter_map(|item| match item {
ast::Item::Fn(it) => Some(it),
_ => None,
}).for_each(&mut process_fn),
ast::ItemList(it) => it.items().filter_map(|item| match item {
ast::Item::Fn(it) => Some(it),
_ => None,
}).for_each(&mut process_fn),
ast::AssocItemList(it) => it.assoc_items().filter_map(|item| match item {
ast::AssocItem::Fn(it) => Some(it),
_ => None,
}).for_each(&mut process_fn),
_ => continue,
}
};
}
params
.into_iter()
.filter_map(|(label, param)| {
let lookup = param.pat()?.syntax().text().to_string();
Some((label, lookup))
})
.for_each(|(label, lookup)| {
CompletionItem::new(CompletionKind::Magic, ctx.source_range(), label)
.kind(crate::CompletionItemKind::Binding)
.lookup_by(lookup)
.add_to(acc)
});
}
#[cfg(test)]
mod tests {
use expect::{expect, Expect};
use crate::completion::{test_utils::completion_list, CompletionKind};
fn check(ra_fixture: &str, expect: Expect) {
let actual = completion_list(ra_fixture, CompletionKind::Magic);
expect.assert_eq(&actual);
}
#[test]
fn test_param_completion_last_param() {
check(
r#"
fn foo(file_id: FileId) {}
fn bar(file_id: FileId) {}
fn baz(file<|>) {}
"#,
expect![[r#"
bn file_id: FileId
"#]],
);
}
#[test]
fn test_param_completion_nth_param() {
check(
r#"
fn foo(file_id: FileId) {}
fn baz(file<|>, x: i32) {}
"#,
expect![[r#"
bn file_id: FileId
"#]],
);
}
#[test]
fn test_param_completion_trait_param() {
check(
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<|>)
}
"#,
expect![[r#"
bn file_id: FileId
"#]],
);
}
#[test]
fn completes_param_in_inner_function() {
check(
r#"
fn outer(text: String) {
fn inner(<|>)
}
"#,
expect![[r#"
bn text: String
"#]],
)
}
}
|
