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|
//! FIXME: write short doc here
use ra_syntax::{
ast::{self, ModuleItemOwner},
match_ast, AstNode,
};
use rustc_hash::FxHashMap;
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();
for node in ctx.token.parent().ancestors() {
let items = match_ast! {
match node {
ast::SourceFile(it) => it.items(),
ast::ItemList(it) => it.items(),
_ => continue,
}
};
for item in items {
if let ast::ModuleItem::FnDef(func) = item {
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((0, param)).0 += 1;
})
}
}
}
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, ctx.source_range(), label)
.lookup_by(lookup)
.add_to(acc)
});
}
#[cfg(test)]
mod tests {
use crate::completion::{test_utils::do_completion, CompletionItem, CompletionKind};
use insta::assert_debug_snapshot;
fn do_magic_completion(code: &str) -> Vec<CompletionItem> {
do_completion(code, CompletionKind::Magic)
}
#[test]
fn test_param_completion_last_param() {
assert_debug_snapshot!(
do_magic_completion(
r"
fn foo(file_id: FileId) {}
fn bar(file_id: FileId) {}
fn baz(file<|>) {}
",
),
@r###"
[
CompletionItem {
label: "file_id: FileId",
source_range: 110..114,
delete: 110..114,
insert: "file_id: FileId",
lookup: "file_id",
},
]
"###
);
}
#[test]
fn test_param_completion_nth_param() {
assert_debug_snapshot!(
do_magic_completion(
r"
fn foo(file_id: FileId) {}
fn bar(file_id: FileId) {}
fn baz(file<|>, x: i32) {}
",
),
@r###"
[
CompletionItem {
label: "file_id: FileId",
source_range: 110..114,
delete: 110..114,
insert: "file_id: FileId",
lookup: "file_id",
},
]
"###
);
}
#[test]
fn test_param_completion_trait_param() {
assert_debug_snapshot!(
do_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###"
[
CompletionItem {
label: "file_id: FileId",
source_range: 289..293,
delete: 289..293,
insert: "file_id: FileId",
lookup: "file_id",
},
]
"###
);
}
}
|
