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#!/usr/bin/env python

# coding: utf-8

from pytest import raises

from msgpack import packb, unpackb

def _decode_complex(obj):

if b'__complex__' in obj:

return complex(obj[b'real'], obj[b'imag'])

return obj

def _encode_complex(obj):

if isinstance(obj, complex):

return {b'__complex__': True, b'real': 1, b'imag': 2}

return obj

def test_encode_hook():

packed = packb([3, 1+2j], default=_encode_complex)

unpacked = unpackb(packed, use_list=1)

assert unpacked[1] == {b'__complex__': True, b'real': 1, b'imag': 2}

def test_decode_hook():

packed = packb([3, {b'__complex__': True, b'real': 1, b'imag': 2}])

unpacked = unpackb(packed, object_hook=_decode_complex, use_list=1)

assert unpacked[1] == 1+2j

def test_decode_pairs_hook():

packed = packb([3, {1: 2, 3: 4}])

prod_sum = 1 * 2 + 3 * 4

unpacked = unpackb(packed, object_pairs_hook=lambda l: sum(k * v for k, v in l), use_list=1)

assert unpacked[1] == prod_sum

def test_only_one_obj_hook():

with raises(TypeError):

unpackb(b'', object_hook=lambda x: x, object_pairs_hook=lambda x: x)

def test_bad_hook():

with raises(TypeError):

packed = packb([3, 1+2j], default=lambda o: o)

unpacked = unpackb(packed, use_list=1)

def _arr_to_str(arr):

return ''.join(str(c) for c in arr)

def test_array_hook():

packed = packb([1,2,3])

unpacked = unpackb(packed, list_hook=_arr_to_str, use_list=1)

assert unpacked == '123'

class DecodeError(Exception):

pass

def bad_complex_decoder(o):

raise DecodeError("Ooops!")

def test_an_exception_in_objecthook1():

with raises(DecodeError):

packed = packb({1: {'__complex__': True, 'real': 1, 'imag': 2}})

unpackb(packed, object_hook=bad_complex_decoder)

def test_an_exception_in_objecthook2():

with raises(DecodeError):

packed = packb({1: [{'__complex__': True, 'real': 1, 'imag': 2}]})

unpackb(packed, list_hook=bad_complex_decoder, use_list=1)