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[swfinterp] Formalize built-in classes

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This commit is contained in:
Philipp Hagemeister
2014-11-17 04:54:54 +01:00
parent 4686ae4b64
commit 6b592d93a2
1 changed files with 28 additions and 18 deletions
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46
youtube_dl/swfinterp.py
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@@ -149,6 +149,11 @@ def _read_byte(reader):
StringClass = _AVMClass('(no name idx)', 'String')
ByteArrayClass = _AVMClass('(no name idx)', 'ByteArray')
_builtin_classes = {
StringClass.name: StringClass,
ByteArrayClass.name: ByteArrayClass,
}
class _Undefined(object):
@@ -468,11 +473,31 @@ class SWFInterpreter(object):
[stack.pop() for _ in range(arg_count)]))
obj = stack.pop()
if isinstance(obj, _AVMClass_Object):
if obj == StringClass:
if mname == 'String':
assert len(args) == 1
assert isinstance(args[0], (
int, compat_str, _Undefined))
if args[0] == undefined:
res = 'undefined'
else:
res = compat_str(args[0])
stack.append(res)
continue
else:
raise NotImplementedError(
'Function String.%s is not yet implemented'
% mname)
elif isinstance(obj, _AVMClass_Object):
func = self.extract_function(obj.avm_class, mname)
res = func(args)
stack.append(res)
continue
elif isinstance(obj, _AVMClass):
func = self.extract_function(obj, mname)
res = func(args)
stack.append(res)
continue
elif isinstance(obj, _ScopeDict):
if mname in obj.avm_class.method_names:
func = self.extract_function(obj.avm_class, mname)
@@ -504,21 +529,6 @@ class SWFInterpreter(object):
res = args[0].join(obj)
stack.append(res)
continue
elif obj == StringClass:
if mname == 'String':
assert len(args) == 1
assert isinstance(args[0], (
int, compat_str, _Undefined))
if args[0] == undefined:
res = 'undefined'
else:
res = compat_str(args[0])
stack.append(res)
continue
else:
raise NotImplementedError(
'Function String.%s is not yet implemented'
% mname)
raise NotImplementedError(
'Unsupported property %r on %r'
% (mname, obj))
@@ -582,8 +592,8 @@ class SWFInterpreter(object):
break
else:
res = scopes[0]
if mname not in res and mname == 'String':
stack.append(StringClass)
if mname not in res and mname in _builtin_classes:
stack.append(_builtin_classes[mname])
else:
stack.append(res[mname])
elif opcode == 94: # findproperty