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pythonpythonjs.py
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213 lines (195 loc) · 6.76 KB
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def jsrange(num):
"""Emulates Python's range function"""
JS('var i')
JS('var r')
i = 0
r = JS('[]')
while i < num:
r.push(i)
i = i + 1
return r
def create_array():
"""Used to fix a bug/feature of Javascript where new Array(number)
created a array with number of undefined elements which is not
what we want"""
JS('var array = new Array()')
for i in jsrange(arguments.length):
JS('array.push(arguments[i])')
return array
def adapt_arguments(handler):
"""Useful to transform callback arguments to positional arguments"""
def func():
handler(Array.prototype.slice.call(arguments))
return func
def create_class(class_name, parents, attrs):
"""Create a PythonScript class"""
if attrs.__metaclass__:
var(metaclass)
metaclass = attrs.__metaclass__
attrs.__metaclass__ = None
return metaclass(JS('[class_name, parents, attrs]'))
var(klass)
klass = JSObject()
klass.bases = parents
klass.__name__ = class_name
klass.__dict__ = attrs
def __call__():
"""Create a PythonScript object"""
JS('var object')
object = JSObject()
object.__class__ = klass
object.__dict__ = JSObject()
JS('var init')
init = get_attribute(object, '__init__')
if init:
init.apply(None, arguments)
return object
klass.__call__ = __call__
return klass
def get_attribute(object, attribute):
"""Retrieve an attribute, method or property
method are actually functions which are converted to methods by
prepending their arguments with the current object. Properties are
not functions!"""
if attribute == '__call__':
if JS("{}.toString.call(object) === '[object Function]'"):
return object
var(attr)
JS('attr = object[attribute]')
if attr:
return attr
var(__class__, __dict__, __get__, bases)
# Check object.__class__.__dict__ for data descriptors named attr
__class__ = object.__class__
if __class__:
__dict__ = __class__.__dict__
attr = JS('__dict__[attribute]')
if attr:
__get__ = get_attribute(attr, '__get__')
if __get__:
return __get__(JS('[object, __class__]'))
bases = __class__.bases
for i in jsrange(bases.length):
var(base, attr)
JS('base = bases[i]')
attr = get_attribute(base, attribute)
if attr:
__get__ = get_attribute(attr, '__get__')
if __get__:
return __get__(JS('[object, __class__]'))
# Check object.__dict__ for attr and its bases if it a class
# in the case if the descriptor is found return it
__dict__ = object.__dict__
bases = object.__bases__
if __dict__:
attr = JS('__dict__[attribute]')
if attr != None:
if bases:
__get__ = get_attribute(attr, '__get__')
if __get__:
return __get__(JS('[undefined, __class__]'))
return attr
if bases:
for i in jsrange(bases.length):
var(base, attr)
JS('base = bases[i]')
attr = get_attribute(base, attribute)
if attr:
__get__ = get_attribute(attr, '__get__')
if __get__:
return __get__(JS('[object, __class__]'))
if __class__:
JS('var __dict__ = __class__.__dict__')
attr = JS('__dict__[attribute]')
if attr:
if JS("{}.toString.call(attr) === '[object Function]'"):
def method():
var(args)
args = arguments
if args.length > 0:
JS('args[0]').splice(0, 0, object)
else:
args = JSArray(object)
return attr.apply(None, args)
return method
return attr
bases = __class__.bases
for i in jsrange(bases.length):
JS('var base = bases[i]')
JS('var attr = get_attribute(base, attribute)')
if attr:
if JS("{}.toString.call(attr) === '[object Function]'"):
def method():
JS('var args = arguments')
if(args.length>0):
JS('args[0]').splice(0, 0, object)
else:
args = JSArray(object)
return attr.apply(None, args)
return method
return attr
return None # XXX: raise AttributeError instead
def set_attribute(object, attribute, value):
"""Set an attribute on an object by updating its __dict__ property"""
var(__dict__, __class__)
__class__ = object.__class__
if __class__:
var(attr, bases)
__dict__ = __class__.__dict__
attr = JS('__dict__[attribute]')
if attr != None:
__set__ = get_attribute(attr, '__set__')
if __set__:
__set__(JS('[object, value]'))
return
bases = __class__.bases
for i in jsrange(bases.length):
var(base)
base = JS('bases[i]')
attr = get_attribute(base, attribute)
if attr:
__set__ = get_attribute(attr, '__set__')
if __set__:
__set__(JS('[object, value]'))
return
__dict__ = object.__dict__
if __dict__:
JS('__dict__[attribute] = value')
else:
JS('object[attribute] = value')
def get_arguments(signature, args, kwargs):
"""Based on ``signature`` and ``args``, ``kwargs`` parameters retrieve
the actual parameters.
This will set default keyword arguments and retrieve positional arguments
in kwargs if their called as such"""
out = JSObject()
if signature.args.length:
argslength = signature.args.length
else:
argslength = 0
kwargslength = JS('Object.keys(signature.kwargs).length')
j = 0
for i in jsrange(argslength):
arg = JS('signature.args[j]')
if kwargs:
kwarg = JS('kwargs[arg]')
if kwarg:
JS('out[arg] = kwarg')
else:
JS('out[arg] = args[j]')
j = j + 1
else:
JS('out[arg] = args[j]')
j = j + 1
args = args.slice(j)
if signature.vararg:
JS("out[signature.vararg] = args")
if signature.varkwarg:
JS("out[signature.varkwarg] = kwargs")
return out
def type(args, kwargs):
var(class_name, parents, attrs)
class_name = JS('args[0]')
parents = JS('args[1]')
attrs = JS('args[2]')
return create_class(class_name, parents, attrs)