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[jsinterp] Support string concatenation with + and += (#15990)

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Authored by: bashonly
This commit is contained in:
bashonly
2026-02-17 17:46:20 -06:00
committed by GitHub
parent c9c8651975
commit d108ca10b9
2 changed files with 12 additions and 0 deletions
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8
test/test_jsinterp.py
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@@ -109,6 +109,14 @@ class TestJSInterpreter(unittest.TestCase):
self._test('function f(){return -12616 ^ 5041}', -8951)
self._test('function f(){return 21 << 4294967297}', 42)
def test_string_concat(self):
self._test('function f(){return "a" + "b";}', 'ab')
self._test('function f(){let x = "a"; x += "b"; return x;}', 'ab')
self._test('function f(){return "a" + 1;}', 'a1')
self._test('function f(){let x = "a"; x += 1; return x;}', 'a1')
self._test('function f(){return 2 + "b";}', '2b')
self._test('function f(){let x = 2; x += "b"; return x;}', '2b')
def test_array_access(self):
self._test('function f(){var x = [1,2,3]; x[0] = 4; x[0] = 5; x[2.0] = 7; return x;}', [5, 2, 7])

4
yt_dlp/jsinterp.py
View File

@@ -376,6 +376,10 @@ class JSInterpreter:
if not _OPERATORS.get(op):
return right_val
# TODO: This is only correct for str+str and str+number; fix for str+array, str+object, etc
if op == '+' and (isinstance(left_val, str) or isinstance(right_val, str)):
return f'{left_val}{right_val}'
try:
return _OPERATORS[op](left_val, right_val)
except Exception as e: