From 66df00231a8fc5bd54888a24524f896048bd0137 Mon Sep 17 00:00:00 2001
From: jviide <jviide@iki.fi>
Date: Thu, 16 Feb 2023 15:43:28 +0200
Subject: [PATCH] Check that the node has a parent before matching a 'child'
 selector (#138)

Co-authored-by: Michael Ficarra <github@michael.ficarra.me>
---
 esquery.js            | 2 +-
 tests/queryComplex.js | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/esquery.js b/esquery.js
index 715919e..a7fe363 100644
--- a/esquery.js
+++ b/esquery.js
@@ -189,7 +189,7 @@ function generateMatcher(selector) {
             const left = getMatcher(selector.left);
             const right = getMatcher(selector.right);
             return (node, ancestry, options) => {
-                if (right(node, ancestry, options)) {
+                if (ancestry.length > 0 && right(node, ancestry, options)) {
                     return left(ancestry[0], ancestry.slice(1), options);
                 }
                 return false;
diff --git a/tests/queryComplex.js b/tests/queryComplex.js
index d71aab1..c596f7f 100644
--- a/tests/queryComplex.js
+++ b/tests/queryComplex.js
@@ -38,4 +38,10 @@ describe('Complex selector query', function () {
             simpleProgram.body[2]
         ]);
     });
+
+    it('can not match a top level node', function () {
+        // Test fix for issue #135: half of a child selector matches a top-level node.
+        const matches = esquery(simpleProgram, 'NonExistingNodeType > *');
+        assert.isEmpty(matches);
+    });
 });