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"""Implements the Event class."""
from math import *
class Event:
def __init__(self, model, assignmentString=''):
self.model = model
self.assignmentString = assignmentString
def initialize(self):
self.count = 0
# Build the list of assignments.
self.assignments = []
if self.assignmentString:
for assignment in self.assignmentString.split(';'):
s = assignment.split('=')
if len(s) != 2:
raise Exception('Bad assignment "' + assignment +
'" in Event.')
self.assignments.append((s[0].strip(),
lambda m, e=self.model.decorate(s[1]):
eval(e)))
def fire(self):
self.count += 1
m = self.model
for (id, f) in self.assignments:
if id in m.species:
m.species[id].amount = f(m)
elif id in m.parameters:
m.parameters[id].value = f(m)
else:
raise Exception('The identifier ' + id + ' in the Event'\
' is neither a species nor a parameter.')
def makeTriggerTimeEvent(event):
"""From the specified event make a new event that assigns the values at
the current time."""
e = Event(event.model)
e.initialize()
for (id, f) in event.assignments:
v = f(event.model)
e.assignments.append((id, lambda m: v))
return e
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