PyYAML and creating python objects from YAML code with YAMLObject ...

Hi @all,

ich have a yaml file containing several documents, like this:

--- !Table
Table:         {Name: SYSTEM_PARAMETER_TABLE, Get: 10, Set: 11}
ConfigID:      {'No': 0xfb, Type: 0x02, Status: OR, Length: 2}
SerialNum:     {'No': 0x01, Type: 0x04, Status: WR, Length: 4}
HWVersion:     {'No': 0x02, Type: 0x06, Status: OR, Length: 4}
FWVersion:     {'No': 0x03, Type: 0x06, Status: OR, Length: 4}
Baudrate:      {'No': 0x04, Type: 0x02, Status: WR, Length: 2}
ModuleName:    {'No': 0x05, Type: 0x80, Status: OR, Length: 16}
ModuleCode:    {'No': 0x06, Type: 0x02, Status: OR, Length: 2}
ModuleInfo1:   {'No': 0x07, Type: 0x00, Status: WR, Length: 1}
ModuleInfo2:   {'No': 0x08, Type: 0x00, Status: WR, Length: 1}

--- !Table
Table:             {Name: DEVICE_CONFIGURATION_PARAMETER_TABLE, Get: 12,
Set: 13}
ConfigID:          {'No': 0xfb, Type: 0x02, Status: OR, Length: 2}
MeasMode:          {'No': 0x01, Type: 0x00, Status: WR, Length: 1}
MeasTimes:         {'No': 0x02, Type: 0x00, Status: WR, Length: 1}
SleepTimeInModeC:  {'No': 0x03, Type: 0x04, Status: WR, Length: 4}
WaitTimeInModeB:   {'No': 0x04, Type: 0x02, Status: WR, Length: 2}
MoistMaxValue:     {'No': 0x05, Type: 0x00, Status: WR, Length: 1}
MoistMinValue:     {'No': 0x06, Type: 0x00, Status: WR, Length: 1}
TempMaxValue:      {'No': 0x07, Type: 0x01, Status: WR, Length: 1}
TempMinValue:      {'No': 0x08, Type: 0x01, Status: WR, Length: 1}
MoistAnalogAdjust: {'No': 0x09, Type: 0x00, Status: WR, Length: 1}
TempAnalogAdjust:  {'No': 0x0a, Type: 0x00, Status: WR, Length: 1}
TMsMode:           {'No': 0x0b, Type: 0x02, Status: WR, Length: 2}
EPRByteLen:        {'No': 0x0c, Type: 0x02, Status: OR, Length: 2}

and I wanna use this 'tables' to construct nested python classes by
subclassing 'YAMLObject'.
My first attempt was like this:

class Row(object):
    def __init__(self, *args, **kwargs):
        self.__dict__.update(kwargs)

    def __repr__(self):
        return "%s" % self.__class__.__name__

class Table(YAMLObject):
    """Spezialized Class for wraping YAML Data structures to python
objects"""
    yaml_tag = u'!Table'

    def __init__(self, *args, **kwargs):
        for row in kwargs:
            setattr(self, row, Row(kwargs[row]))

    def __repr__(self):
        return "%s(Name=%s)" % (self.__class__.__name__, self.Table.Name)

and then using load_all to build the classes.

tables = self._yamlProjector(load_all(stream, Loader=Loader))

But that doesn't work the way I expected, course It seems that the
__init__() methode is not
executed while factorizing the Classes ... so I tryed it that way:

class Row(object):
    def __init__(self, *args, **kwargs):
        self.__dict__.update(kwargs)

    def __repr__(self):
        return "%s" % self.__class__.__name__

class Table(YAMLObject):
    """Spezialized Class for wraping YAML Data structures to python
objects"""
    yaml_tag = u'!Table'

    @classmethod
    def from_yaml(cls, loader, node):
        return Node

    @classmethod
    def to_yaml(cls, dumper, data):
        # ...
        return node

But now I'm a little lost what to do with the complex Node-Structure I get
.... how to I unpack the node
and create Row() Classes so I get a Table()-Class with nested Row()-Classes
like this:

Table.Baudrate.Length
Table.ModuleName.Status

Or the even better question would be: How to I use the from_yaml() and
to_yaml() methodes?

Thanks in advance for your help, Markus

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