On Tue, 2013-06-25 at 10:09 +0100, Apexi 200sx wrote:
> Hi,
>
>
> might be one for Kees or C Anthony
>
>
>
> I want to use the msgpack (serialization format) JS library from
> pyjs/pyjamas
>
>
> I am tried to use builtin conversion routines
>
>
> """my_msgpack module"""
>
> from __pyjamas__ import JS
> from pyjslib import toJSObjects, isArray, isObject
> import json
>
> parser = json.JSONParser()
> js_to_py = getattr(parser, 'jsObjectToPyObject')
>
>
> def pack(obj):
> js_obj = toJSObjects(obj)
> print js_obj
What you get here, is an array. Try this:
is_array = JS("(js_obj instanceof Array? true : false)")
print "pack js_obj instanceof Array:", is_array
> JS("""
> return $wnd.msgpack.pack(@{{js_obj}});
> """)
>
> def unpack_to_js(packed_js):
> JS("""
> tmp = $wnd.msgpack.unpack(@{{packed_js}});
> console.log(@{{isArray}}(tmp));
> console.log(@{{isObject}}(tmp));
> console.log(tmp[0]);
> return tmp;
> """)
>
> def unpack(packed):
> js_obj = unpack_to_js(packed)
What you get here, looks like an array, but isn't. Try this:
is_array = JS("(js_obj instanceof Array? true : false)")
print "pack js_obj instanceof Array:", is_array
> print js_obj
> py_obj = js_to_py(js_obj)
> return py_obj
My guess is that something weird happening in msgpack.unpack. The js
object to be packed is an instance of Array, while the unpacked js
object is not an instance of Array.
> then from another module i do...
>
>
> list_dat = [[1,2,3,4], ["a","b","c","d"]]
>
>
> packed = my_msgpack.pack(list_dat)
>
> my_msgpack.unpack(packed)
>
>
> results in...
>
> {'0': {'0': 1, '1': 2, '2': 3, '3': 4}, '1': {'0': 'a', '1': 'b', '2':
> 'c', '3': 'd'}}
>
>
> from the above unpack_to_js function...
>
> console.log(@{{isArray}}(tmp)); results in false
> console.log(@{{isObject}}(tmp)); results in true
> console.log(tmp[0]); results in [1,2,3,4]
>
>
> so it seems toJSObjects is constructing the correct javascript
> objects/types and msgpack is able to convert to/from msgpack format
> fine but I cannot turn the resulting JS into the correct python types.
>
>
> Note also that I have tried...
> js_to_py = getattr(parser, 'jsObjectToPyObject')
> and
> js_to_py = getattr(parser, 'jsObjectToPy')
>
>
>
>
> attached is the msgpack.js lib
>
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