pysidetap is available on PyPI pypi-pysidetap and you can install it using pip:
`sh
pip install pysidetap
`
Simple Decision Table Processor
https://en.wikipedia.org/wiki/Decision_table
- This function find and return field 'return' from Decision Table,
- when all operands in row by 'fields' are True.
This example show use case off Traffic lights decisions.
https://en.wikipedia.org/wiki/Traffic_light#Meanings_of_signals
Decision Table:
| red | yellow | green | return |
|---|---|---|---|
| ==on | ==off | ==off | stop |
| ==on | ==on | ==off | ready |
| ==off | ==off | ==on | go |
| ==off | ==on | ==off | break |
| ==off | ==off | ==off | off |
from pysidetap.processor import DTProcessor
DTableTL = [
{
'fields': {
'red': {'op':'==', 'value':'on'},
'yellow': {'op':'==', 'value':'off'},
'green': {'op':'==', 'value':'off'},
},
# Traffic may not proceed beyond the stop line or
# otherwise enter the intersection
'return': {'stop'}
},
{
'fields': {
'red': {'op':'==', 'value':'on'},
'yellow': {'op':'==', 'value':'on'},
'green': {'op':'==', 'value':'off'},
},
# The signal is about to change, but the red light rules do apply
'return': {'ready'}
},
{
'fields': {
'red': {'op':'==', 'value':'off'},
'yellow': {'op':'==', 'value':'off'},
'green': {'op':'==', 'value':'on'},
},
# Traffic may not pass the stop line or enter the intersection
# unless it cannot safely stop when the light shows
'return': {'go'}
},
{
'fields': {
'red': {'op':'==', 'value':'off'},
'yellow': {'op':'==', 'value':'on'},
'green': {'op':'==', 'value':'off'},
},
# Traffic may proceed unless it would not clear the intersection
# before the next change of phase
'return': {'break'}
},
{
'fields': {
'red': {'op':'==', 'value':'off'},
'yellow': {'op':'==', 'value':'off'},
'green': {'op':'==', 'value':'off'},
},
# Traffic lights is off
'return': {'off'}
},
]
p = DTProcessor(DTableTL)
for red in ['on','off']:
for yellow in ['on','off']:
for green in ['on','off']:
result = p.process({'red':red, 'yellow':yellow, 'green':green})
print(f'red: {red}, yellow: {yellow}, green: {green}, result:{result}')As usual for any GitHub-based project, raise an issue if you find any bug or want to suggest an improvement, or open a discussion if you want to discuss or chat 😉
v0.0.10