/usr/lib/python2.7/dist-packages/libavg/statemachine.py is in python-libavg 1.8.0-1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 | # libavg - Media Playback Engine.
# Copyright (C) 2003-2014 Ulrich von Zadow
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Current versions can be found at www.libavg.de
#
from methodref import methodref
import subprocess
import os
class State(object):
def __init__(self, transitions, enterFunc, leaveFunc):
self.transitions = {}
for destState, transfunc in transitions.items():
ref = methodref(transfunc)
self.transitions[destState] = ref
self.enterFunc = methodref(enterFunc)
self.leaveFunc = methodref(leaveFunc)
class StateMachine(object):
def __init__(self, name, startState):
self.__states = {}
self.__name = name
self.__startState = startState
self.__curState = startState
self.__trace = False
self.__initDone = False
def addState(self, state, transitions, enterFunc=None, leaveFunc=None):
if self.__initDone:
raise RuntimeError(
"StateMachine: Can't add new states after calling changeState")
if self.__states.has_key(state):
raise RuntimeError("StateMachine: Duplicate state " + state + ".")
if isinstance(transitions, (list, tuple)):
transitions = dict.fromkeys(transitions)
self.__states[state] = State(transitions, enterFunc, leaveFunc)
def changeState(self, newState):
if not(self.__initDone):
self.__initDone = True
self.__doSanityCheck()
if self.__trace:
print self.__name, ":", self.__curState, "-->", newState
if not(newState in self.__states):
raise RuntimeError('StateMachine: Attempt to change to nonexistent state '+
newState+'.')
assert(self.__curState in self.__states)
state = self.__states[self.__curState]
if newState in state.transitions:
if state.leaveFunc() != None:
state.leaveFunc()()
transitionFunc = state.transitions[newState]()
if transitionFunc != None:
try:
transitionFunc(self.__curState, newState)
except TypeError:
transitionFunc()
self.__curState = newState
enterFunc = self.__states[self.__curState].enterFunc()
if enterFunc != None:
enterFunc()
else:
raise RuntimeError('StateMachine: State change from '+self.__curState+' to '+
newState+' not allowed.')
def traceChanges(self, trace):
self.__trace = trace
@property
def state(self):
return self.__curState
def dump(self):
for oldStateName, state in self.__states.iteritems():
print oldStateName, ("(enter: " + self.__getNiceFuncName(state.enterFunc)
+ ", leave: " + self.__getNiceFuncName(state.leaveFunc) + "):")
for newState, func in state.transitions.iteritems():
print " -->", newState, ":", self.__getNiceFuncName(func)
print "Current state:", self.__curState
def makeDiagram(self, fName, showMethods=False):
def writeState(stateName, state):
label = stateName
if showMethods:
if state.enterFunc.__name__ is not(None):
label += ('<br/><font point-size="10">entry/'
+ state.enterFunc.__name__ + '</font>')
if state.leaveFunc.__name__ is not(None):
label += ('<br/><font point-size="10">exit/'
+ state.leaveFunc.__name__ + '</font>')
dotFile.write(' "'+stateName+'" [label=<'+label+'>];\n')
def writeTransition(origState, destState, func):
dotFile.write(' "'+origState+'" -> "'+destState+'"')
if showMethods and func and func.__name__ is not(None):
dotFile.write(' [label="/'+func.__name__+'", fontsize=10]')
dotFile.write(";\n")
dotFile = open("tmp.dot", "w")
dotFile.write('digraph "'+self.__name+'" {\n')
dotFile.write(' node [fontsize=12, shape=box, style=rounded];\n')
dotFile.write(' startstate [shape=point, height=0.2, width=0.2, label=""];\n')
dotFile.write(' { rank=source; "startstate" };\n')
writeTransition("startstate", self.__startState, None)
for stateName, state in self.__states.iteritems():
writeState(stateName, state)
for destState, func in state.transitions.iteritems():
writeTransition(stateName, destState, func)
dotFile.write(' "'+self.__curState+'" [style="rounded,bold"];\n')
dotFile.write('}\n')
dotFile.close()
try:
subprocess.call(["dot", "tmp.dot", "-Tpng", "-o"+fName])
except OSError:
raise RuntimeError("dot executable not found. graphviz needs to be installed for StateMachine.makeDiagram to work.")
os.remove("tmp.dot")
def __getNiceFuncName(self, f):
if f.__name__ is not(None):
return f.__name__
else:
return "None"
def __doSanityCheck(self):
for stateName, state in self.__states.iteritems():
for transitionName in state.transitions.iterkeys():
if not(self.__states.has_key(transitionName)):
raise RuntimeError("StateMachine: transition " + stateName + " -> " +
transitionName + " has an unknown destination state.")
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