[jsinterp] Fix increment/decrement evaluation (#13238)

Closes #13241 Authored by: seproDev, bashonly Co-authored-by: bashonly <[email protected]>
2026-09-05 16:40:37 +00:00 · 2025-05-21 22:27:07 +00:00
parent 83fabf3524
commit 167d7a9f0f
3 changed files with 43 additions and 30 deletions
@@ -478,6 +478,14 @@ class TestJSInterpreter(unittest.TestCase):
        func = jsi.extract_function('c', {'e': 10}, {'f': 100, 'g': 1000})
        self.assertEqual(func([1]), 1111)

+    def test_increment_decrement(self):
+        self._test('function f() { var x = 1; return ++x; }', 2)
+        self._test('function f() { var x = 1; return x++; }', 1)
+        self._test('function f() { var x = 1; x--; return x }', 0)
+        self._test('function f() { var y; var x = 1; x++, --x, x--, x--, y="z", "abc", x++; return --x }', -1)
+        self._test('function f() { var a = "test--"; return a; }', 'test--')
+        self._test('function f() { var b = 1; var a = "b--"; return a; }', 'b--')
+

 if __name__ == '__main__':
    unittest.main()
@@ -316,6 +316,10 @@ _NSIG_TESTS = [
        'https://www.youtube.com/s/player/8a8ac953/tv-player-es6.vflset/tv-player-es6.js',
        'MiBYeXx_vRREbiCCmh', 'RtZYMVvmkE0JE',
    ),
+    (
+        'https://www.youtube.com/s/player/59b252b9/player_ias.vflset/en_US/base.js',
+        'D3XWVpYgwhLLKNK4AGX', 'aZrQ1qWJ5yv5h',
+    ),
 ]