Cool_Tools/youtube-dl
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[jsinterp] Fix and improve "methods"

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* push, unshift return new length
* impove edge cases for push/pop, shift/unshift, forEach, indexOf, charCodeAt
* increase test coverage
This commit is contained in:
dirkf 2024-12-12 04:16:07 +00:00
parent 94fd774608
commit 60835ca16c
2 changed files with 49 additions and 21 deletions
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34
test/test_jsinterp.py
View File

@ -544,6 +544,40 @@ class TestJSInterpreter(unittest.TestCase):
self._test('function f(){return "012345678".slice(-1, 1)}', '')
self._test('function f(){return "012345678".slice(-3, -1)}', '67')
def test_pop(self):
# pop
self._test('function f(){var a = [0, 1, 2, 3, 4, 5, 6, 7, 8]; return [a.pop(), a]}',
[8, [0, 1, 2, 3, 4, 5, 6, 7]])
self._test('function f(){return [].pop()}', JS_Undefined)
# push
self._test('function f(){var a = [0, 1, 2]; return [a.push(3, 4), a]}',
[5, [0, 1, 2, 3, 4]])
self._test('function f(){var a = [0, 1, 2]; return [a.push(), a]}',
[3, [0, 1, 2]])
def test_shift(self):
# shift
self._test('function f(){var a = [0, 1, 2, 3, 4, 5, 6, 7, 8]; return [a.shift(), a]}',
[0, [1, 2, 3, 4, 5, 6, 7, 8]])
self._test('function f(){return [].shift()}', JS_Undefined)
# unshift
self._test('function f(){var a = [0, 1, 2]; return [a.unshift(3, 4), a]}',
[5, [3, 4, 0, 1, 2]])
self._test('function f(){var a = [0, 1, 2]; return [a.unshift(), a]}',
[3, [0, 1, 2]])
def test_forEach(self):
self._test('function f(){var ret = []; var l = [4, 2]; '
'var log = function(e,i,a){ret.push([e,i,a]);}; '
'l.forEach(log); '
'return [ret.length, ret[0][0], ret[1][1], ret[0][2]]}',
[2, 4, 1, [4, 2]])
self._test('function f(){var ret = []; var l = [4, 2]; '
'var log = function(e,i,a){this.push([e,i,a]);}; '
'l.forEach(log, ret); '
'return [ret.length, ret[0][0], ret[1][1], ret[0][2]]}',
[2, 4, 1, [4, 2]])
if __name__ == '__main__':
unittest.main()

36
youtube_dl/jsinterp.py
View File

@ -1113,37 +1113,31 @@ class JSInterpreter(object):
index, how_many = map(int, (argvals + [len(obj)])[:2])
if index < 0:
index += len(obj)
add_items = argvals[2:]
res = []
for _ in range(index, min(index + how_many, len(obj))):
res.append(obj.pop(index))
for i, item in enumerate(add_items):
obj.insert(index + i, item)
res = [obj.pop(index)
for _ in range(index, min(index + how_many, len(obj)))]
obj[index:index] = argvals[2:]
return res
elif member == 'unshift':
assertion(isinstance(obj, list), 'must be applied on a list')
assertion(argvals, 'takes one or more arguments')
for item in reversed(argvals):
obj.insert(0, item)
return obj
elif member == 'pop':
elif member in ('shift', 'pop'):
assertion(isinstance(obj, list), 'must be applied on a list')
assertion(not argvals, 'does not take any arguments')
if not obj:
return
return obj.pop()
return obj.pop(0 if member == 'shift' else -1) if len(obj) > 0 else JS_Undefined
elif member == 'unshift':
assertion(isinstance(obj, list), 'must be applied on a list')
# not enforced: assertion(argvals, 'takes one or more arguments')
obj[0:0] = argvals
return len(obj)
elif member == 'push':
assertion(argvals, 'takes one or more arguments')
# not enforced: assertion(argvals, 'takes one or more arguments')
obj.extend(argvals)
return obj
return len(obj)
elif member == 'forEach':
assertion(argvals, 'takes one or more arguments')
assertion(len(argvals) <= 2, 'takes at-most 2 arguments')
assertion(len(argvals) <= 2, 'takes at most 2 arguments')
f, this = (argvals + [''])[:2]
return [f((item, idx, obj), {'this': this}, allow_recursion) for idx, item in enumerate(obj)]
elif member == 'indexOf':
assertion(argvals, 'takes one or more arguments')
assertion(len(argvals) <= 2, 'takes at-most 2 arguments')
assertion(len(argvals) <= 2, 'takes at most 2 arguments')
idx, start = (argvals + [0])[:2]
try:
return obj.index(idx, start)
@ -1152,7 +1146,7 @@ class JSInterpreter(object):
elif member == 'charCodeAt':
assertion(isinstance(obj, compat_str), 'must be applied on a string')
# assertion(len(argvals) == 1, 'takes exactly one argument') # but not enforced
idx = argvals[0] if isinstance(argvals[0], int) else 0
idx = argvals[0] if len(argvals) > 0 and isinstance(argvals[0], int) else 0
if idx >= len(obj):
return None
return ord(obj[idx])