source: pyyaml/trunk/tests/test_constructor.py @ 144

import test_appliance
try:
    import datetime
except ImportError:
    pass
try:
    set
except NameError:
    from sets import Set as set

from yaml import *

import xml.parsers

class MyLoader(Loader):
    pass
class MyDumper(Dumper):
    pass

class MyTestClass1:

    def __init__(self, x, y=0, z=0):
        self.x = x
        self.y = y
        self.z = z

    def __eq__(self, other):
        if isinstance(other, MyTestClass1):
            return self.__class__, self.__dict__ == other.__class__, other.__dict__
        else:
            return False

def construct1(constructor, node):
    mapping = constructor.construct_mapping(node)
    return MyTestClass1(**mapping)
def represent1(representer, native):
    return representer.represent_mapping("!tag1", native.__dict__)

add_constructor("!tag1", construct1, Loader=MyLoader)
add_representer(MyTestClass1, represent1, Dumper=MyDumper)

class MyTestClass2(MyTestClass1, YAMLObject):

    yaml_loader = MyLoader
    yaml_dumper = MyDumper
    yaml_tag = "!tag2"

    def from_yaml(cls, constructor, node):
        x = constructor.construct_yaml_int(node)
        return cls(x=x)
    from_yaml = classmethod(from_yaml)

    def to_yaml(cls, representer, native):
        return representer.represent_scalar(cls.yaml_tag, str(native.x))
    to_yaml = classmethod(to_yaml)

class MyTestClass3(MyTestClass2):

    yaml_tag = "!tag3"

    def from_yaml(cls, constructor, node):
        mapping = constructor.construct_mapping(node)
        if '=' in mapping:
            x = mapping['=']
            del mapping['=']
            mapping['x'] = x
        return cls(**mapping)
    from_yaml = classmethod(from_yaml)

    def to_yaml(cls, representer, native):
        return representer.represent_mapping(cls.yaml_tag, native.__dict__)
    to_yaml = classmethod(to_yaml)

class YAMLObject1(YAMLObject):

    yaml_loader = MyLoader
    yaml_dumper = MyDumper
    yaml_tag = '!foo'

    def __init__(self, my_parameter=None, my_another_parameter=None):
        self.my_parameter = my_parameter
        self.my_another_parameter = my_another_parameter

    def __eq__(self, other):
        if isinstance(other, YAMLObject1):
            return self.__class__, self.__dict__ == other.__class__, other.__dict__
        else:
            return False

class YAMLObject2(YAMLObject):

    yaml_loader = MyLoader
    yaml_dumper = MyDumper
    yaml_tag = '!bar'

    def __init__(self, foo=1, bar=2, baz=3):
        self.foo = foo
        self.bar = bar
        self.baz = baz

    def __getstate__(self):
        return {1: self.foo, 2: self.bar, 3: self.baz}

    def __setstate__(self, state):
        self.foo = state[1]
        self.bar = state[2]
        self.baz = state[3]

    def __eq__(self, other):
        if isinstance(other, YAMLObject2):
            return self.__class__, self.__dict__ == other.__class__, other.__dict__
        else:
            return False

class TestConstructorTypes(test_appliance.TestAppliance):

    def _testTypes(self, test_name, data_filename, code_filename):
        data1 = None
        data2 = None
        try:
            data1 = list(load_all(file(data_filename, 'rb'), Loader=MyLoader))
            if len(data1) == 1:
                data1 = data1[0]
            data2 = eval(file(code_filename, 'rb').read())
            self.failUnlessEqual(type(data1), type(data2))
            try:
                self.failUnlessEqual(data1, data2)
            except AssertionError:
                if isinstance(data1, dict):
                    data1 = data1.items()
                    data1.sort()
                    data1 = repr(data1)
                    data2 = data2.items()
                    data2.sort()
                    data2 = repr(data2)
                if data1 != data2:
                    raise
        except:
            print
            print "DATA:"
            print file(data_filename, 'rb').read()
            print "CODE:"
            print file(code_filename, 'rb').read()
            print "NATIVES1:", data1
            print "NATIVES2:", data2
            raise

TestConstructorTypes.add_tests('testTypes', '.data', '.code')