From e83cdf3fd33a43e1ff78793995adbe23bd62ae49 Mon Sep 17 00:00:00 2001
From: Gokul Soumya <gokulps15@gmail.com>
Date: Sat, 26 Feb 2022 20:14:43 +0530
Subject: [PATCH] Ensure non empty grouped nodes in textobject queries

---
 helix-core/src/syntax.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/helix-core/src/syntax.rs b/helix-core/src/syntax.rs
index 8f62bead2..f2939e3d3 100644
--- a/helix-core/src/syntax.rs
+++ b/helix-core/src/syntax.rs
@@ -246,6 +246,7 @@ pub struct TextObjectQuery {
 
 pub enum CapturedNode<'a> {
     Single(Node<'a>),
+    /// Guarenteed to be not empty
     Grouped(Vec<Node<'a>>),
 }
 
@@ -318,7 +319,12 @@ impl TextObjectQuery {
 
             let iter: Box<dyn Iterator<Item = CapturedNode>> = match quantifier {
                 CaptureQuantifier::OneOrMore | CaptureQuantifier::ZeroOrMore => {
-                    Box::new(std::iter::once(CapturedNode::Grouped(nodes.collect())))
+                    let nodes: Vec<Node> = nodes.collect();
+                    if nodes.is_empty() {
+                        Box::new(std::iter::empty())
+                    } else {
+                        Box::new(std::iter::once(CapturedNode::Grouped(nodes)))
+                    }
                 }
                 _ => Box::new(nodes.map(CapturedNode::Single)),
             };