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[jsinterp] Overhaul JSInterp to handle new YT players 4c3f79c5, 324f67b9 (#31170)

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* back-port from yt-dlp 8f53dc44a0cc1c2d98c35740b9293462c080f5d0, thanks pukkandan
* also support void, improve <</>> precedence, improve expressions in comma-list
* add more tests
This commit is contained in:
dirkf
2022-08-14 18:45:45 +01:00
committed by GitHub
parent e6a836d54c
commit d231b56717
6 changed files with 500 additions and 247 deletions
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49
test/test_jsinterp.py
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@ -19,6 +19,9 @@ class TestJSInterpreter(unittest.TestCase):
jsi = JSInterpreter('function x3(){return 42;}')
self.assertEqual(jsi.call_function('x3'), 42)
jsi = JSInterpreter('function x3(){42}')
self.assertEqual(jsi.call_function('x3'), None)
jsi = JSInterpreter('var x5 = function(){return 42;}')
self.assertEqual(jsi.call_function('x5'), 42)
@ -51,8 +54,11 @@ class TestJSInterpreter(unittest.TestCase):
jsi = JSInterpreter('function f(){return 11 >> 2;}')
self.assertEqual(jsi.call_function('f'), 2)
jsi = JSInterpreter('function f(){return []? 2+3: 4;}')
self.assertEqual(jsi.call_function('f'), 5)
def test_array_access(self):
jsi = JSInterpreter('function f(){var x = [1,2,3]; x[0] = 4; x[0] = 5; x[2] = 7; return x;}')
jsi = JSInterpreter('function f(){var x = [1,2,3]; x[0] = 4; x[0] = 5; x[2.0] = 7; return x;}')
self.assertEqual(jsi.call_function('f'), [5, 2, 7])
def test_parens(self):
@ -62,6 +68,10 @@ class TestJSInterpreter(unittest.TestCase):
jsi = JSInterpreter('function f(){return (1 + 2) * 3;}')
self.assertEqual(jsi.call_function('f'), 9)
def test_quotes(self):
jsi = JSInterpreter(r'function f(){return "a\"\\("}')
self.assertEqual(jsi.call_function('f'), r'a"\(')
def test_assignments(self):
jsi = JSInterpreter('function f(){var x = 20; x = 30 + 1; return x;}')
self.assertEqual(jsi.call_function('f'), 31)
@ -104,18 +114,29 @@ class TestJSInterpreter(unittest.TestCase):
}''')
self.assertEqual(jsi.call_function('x'), [20, 20, 30, 40, 50])
def test_builtins(self):
jsi = JSInterpreter('''
function x() { return new Date('Wednesday 31 December 1969 18:01:26 MDT') - 0; }
''')
self.assertEqual(jsi.call_function('x'), 86000)
jsi = JSInterpreter('''
function x(dt) { return new Date(dt) - 0; }
''')
self.assertEqual(jsi.call_function('x', 'Wednesday 31 December 1969 18:01:26 MDT'), 86000)
def test_call(self):
jsi = JSInterpreter('''
function x() { return 2; }
function y(a) { return x() + a; }
function y(a) { return x() + (a?a:0); }
function z() { return y(3); }
''')
self.assertEqual(jsi.call_function('z'), 5)
self.assertEqual(jsi.call_function('y'), 2)
def test_for_loop(self):
# function x() { a=0; for (i=0; i-10; i++) {a++} a }
jsi = JSInterpreter('''
function x() { a=0; for (i=0; i-10; i = i + 1) {a++} a }
function x() { a=0; for (i=0; i-10; i++) {a++} return a }
''')
self.assertEqual(jsi.call_function('x'), 10)
@ -156,19 +177,19 @@ class TestJSInterpreter(unittest.TestCase):
def test_for_loop_continue(self):
jsi = JSInterpreter('''
function x() { a=0; for (i=0; i-10; i++) { continue; a++ } a }
function x() { a=0; for (i=0; i-10; i++) { continue; a++ } return a }
''')
self.assertEqual(jsi.call_function('x'), 0)
def test_for_loop_break(self):
jsi = JSInterpreter('''
function x() { a=0; for (i=0; i-10; i++) { break; a++ } a }
function x() { a=0; for (i=0; i-10; i++) { break; a++ } return a }
''')
self.assertEqual(jsi.call_function('x'), 0)
def test_literal_list(self):
jsi = JSInterpreter('''
function x() { [1, 2, "asdf", [5, 6, 7]][3] }
function x() { return [1, 2, "asdf", [5, 6, 7]][3] }
''')
self.assertEqual(jsi.call_function('x'), [5, 6, 7])
@ -177,6 +198,22 @@ class TestJSInterpreter(unittest.TestCase):
function x() { a=5; a -= 1, a+=3; return a }
''')
self.assertEqual(jsi.call_function('x'), 7)
jsi = JSInterpreter('''
function x() { a=5; return (a -= 1, a+=3, a); }
''')
self.assertEqual(jsi.call_function('x'), 7)
def test_void(self):
jsi = JSInterpreter('''
function x() { return void 42; }
''')
self.assertEqual(jsi.call_function('x'), None)
def test_return_function(self):
jsi = JSInterpreter('''
function x() { return [1, function(){return 1}][1] }
''')
self.assertEqual(jsi.call_function('x')([]), 1)
if __name__ == '__main__':