python-domain-equations 0.0.3

python-domain-equations

# python-domain-equations

@copyright: 2018 by Pauli Rikula <[e-mail]>

@license: MIT <http://www.opensource.org/licenses/mit-license.php>

Represent and generate domain model classes from category-like equations.

>>> g  = PropertyGraph()
>>> I, O, C = g.I, g.O, g.C

One can represent the need of something with the operator ‘*’ in the following way: To measure speed you have to get interval and distance. To model this you can write:

>>> speed = C('speed')
>>> speed
C(speed)

>>> distance = C('distance')
>>> duration = C('duration')
>>> g.get_properties_from(speed*(distance+duration))
>>> for i in g.properties:
...  print(i)
{"naming": {"type": "Distance", "value": "distance"}}
{"naming": {"type": "Duration", "value": "duration"}}
{"naming": {"type": "Speed", "value": "speed"}, "properties": ["Distance", "Duration"]}

For fines you have to know also:

>>> fine = C('fine')
>>> monthly_income =  C('monthly_income')
>>> speed_limit =  C('speed_limit')
>>> g.get_properties_from(speed*(distance + duration) + fine*(speed + monthly_income + speed_limit))
>>> for i in g.properties:
...  print(i)
{"naming": {"type": "Distance", "value": "distance"}}
{"naming": {"type": "Duration", "value": "duration"}}
{"naming": {"type": "Fine", "value": "fine"}, "properties": ["MonthlyIncome", "Speed", "SpeedLimit"]}
{"naming": {"type": "MonthlyIncome", "value": "monthly_income"}}
{"naming": {"type": "Speed", "value": "speed"}, "properties": ["Distance", "Duration"]}
{"naming": {"type": "SpeedLimit", "value": "speed_limit"}}