1 files changed, 36 insertions, 0 deletions

diff --git a/crates/completion/src/completions.rs b/crates/completion/src/completions.rs
index 5b280c5ba..db27bdd9c 100644
--- a/crates/completion/src/completions.rs
+++ b/crates/completion/src/completions.rs
@@ -11,3 +11,39 @@ pub(crate) mod postfix;
 pub(crate) mod macro_in_item_position;
 pub(crate) mod trait_impl;
 pub(crate) mod mod_;
+
+use crate::item::{Builder, CompletionItem};
+
+/// Represents an in-progress set of completions being built.
+#[derive(Debug, Default)]
+pub struct Completions {
+    buf: Vec<CompletionItem>,
+}
+
+impl Completions {
+    pub fn add(&mut self, item: CompletionItem) {
+        self.buf.push(item.into())
+    }
+
+    pub fn add_all<I>(&mut self, items: I)
+    where
+        I: IntoIterator,
+        I::Item: Into<CompletionItem>,
+    {
+        items.into_iter().for_each(|item| self.add(item.into()))
+    }
+}
+
+impl Into<Vec<CompletionItem>> for Completions {
+    fn into(self) -> Vec<CompletionItem> {
+        self.buf
+    }
+}
+
+impl Builder {
+    /// Convenience method, which allows to add a freshly created completion into accumulator
+    /// without binding it to the variable.
+    pub(crate) fn add_to(self, acc: &mut Completions) {
+        acc.add(self.build())
+    }
+}