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'''
A simple flowchart with boolean decision nodes, enter and exit terminals.
'''
class FlowChartNode(object):
''' flow chart abstract node '''
def process(self, args):
pass
class FCNDecisionBool(FlowChartNode):
''' a boolean decision node '''
def __init__(self, fct, node_T=None, node_F=None):
''' fct(args) -> bool '''
self.fct = fct
self.node_T = node_T
self.node_F = node_F
def set_nodes(self, node_T, node_F):
self.node_T = node_T
self.node_F = node_F
def process(self, args):
if self.fct(args):
return self.node_T
else:
return self.node_F
class FCNDecisionMulti(FlowChartNode):
''' a decision node with multiple (boolean) exits '''
def __init__(self, fct, node_lst=None):
''' fct(args) -> node index, as organized in nodes_lst '''
self.fct = fct
self.nodes = node_lst
def set_node_lst(self, node_lst):
self.nodes = node_lst
def process(self, args):
return self.nodes[self.fct(args)]
class FCNProcess(FlowChartNode):
''' action node with a single exit '''
def __init__(self, fct, node_next=None):
''' fct(args) -> anything '''
self.fct = fct
self.node_next = node_next
def set_nodenext(self, node_next):
self.node_next = node_next
def process(self, args):
self.fct(args)
return self.node_next
class FCNTerminal(FlowChartNode):
''' a terminal node '''
def __init__(self, fct=None, node_next=None, key=''):
''' fct(args) -> anything '''
self.fct = fct
self.node_next = node_next
self.key = key
def set_nodenext(self, node_next):
self.node_next = node_next
def process(self, args):
if self.fct:
self.result = self.fct(args)
return self.node_next
'''
Control class for traversing the chart, executing functions and so on
'''
class FlowChartControl(object):
''' implements the flowchart graph traversal control '''
def __init__(self, terminal_enter):
''' '''
self.terminal_enter = terminal_enter
def process(self, args):
''' traverses the flowchart and returns a node that terminates on process(args) '''
node = self.terminal_enter
next = node
while next:
next = node.process(args)
if next:
node = next
# node must be the exit terminal
return node
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