"""Contains various utility functions."""
__all__ = ['findClass', 'rebindClass', 'copyFuncs', 'replaceMessengerFunc', 'replaceTaskMgrFunc', 'replaceStateFunc', 'replaceCRFunc', 'replaceAIRFunc', 'replaceIvalFunc']
import types
import os
import sys
from direct.showbase.MessengerGlobal import messenger
from direct.task.TaskManagerGlobal import taskMgr
[docs]def findClass(className):
"""
Look in sys.modules dictionary for a module that defines a class
with this className.
"""
for moduleName, module in sys.modules.items():
# Some modules are None for some reason
if module:
# print "Searching in ", moduleName
classObj = module.__dict__.get(className)
# If this modules defines some object called classname and the
# object is a class or type definition and that class's module
# is the same as the module we are looking in, then we found
# the matching class and a good module namespace to redefine
# our class in.
if classObj and isinstance(classObj, type) and \
classObj.__module__ == moduleName:
return [classObj, module.__dict__]
return None
[docs]def rebindClass(filename):
file = open(filename, 'r')
lines = file.readlines()
for line in lines:
if line[0:6] == 'class ':
# Chop off the "class " syntax and strip extra whitespace
classHeader = line[6:].strip()
# Look for a open paren if it does inherit
parenLoc = classHeader.find('(')
if parenLoc > 0:
className = classHeader[:parenLoc]
else:
# Look for a colon if it does not inherit
colonLoc = classHeader.find(':')
if colonLoc > 0:
className = classHeader[:colonLoc]
else:
print('error: className not found')
# Remove that temp file
file.close()
os.remove(filename)
return
print('Rebinding class name: ' + className)
break
# Try to find the original class with this class name
res = findClass(className)
if not res:
print ('Warning: Finder could not find class')
# Remove the temp file we made
file.close()
os.remove(filename)
return
# Store the original real class
realClass, realNameSpace = res
# Now execute that class def in this namespace
exec(compile(open(filename).read(), filename, 'exec'), realNameSpace)
# That execfile should have created a new class obj in that namespace
tmpClass = realNameSpace[className]
# Copy the functions that we just redefined into the real class
copyFuncs(tmpClass, realClass)
# Now make sure the original class is in that namespace,
# not our temp one from the execfile. This will help us preserve
# class variables and other state on the original class.
realNameSpace[className] = realClass
# Remove the temp file we made
file.close()
os.remove(filename)
print (' Finished rebind')
[docs]def copyFuncs(fromClass, toClass):
replaceFuncList = []
newFuncList = []
# Copy the functions from fromClass into toClass dictionary
for funcName, newFunc in fromClass.__dict__.items():
# Filter out for functions
if isinstance(newFunc, types.FunctionType):
# See if we already have a function with this name
oldFunc = toClass.__dict__.get(funcName)
if oldFunc:
# This code is nifty, but with nested functions, give an error:
# SystemError: cellobject.c:22: bad argument to internal function
# Give the new function code the same filename as the old function
# Perhaps there is a cleaner way to do this? This was my best idea.
#newCode = types.CodeType(newFunc.func_code.co_argcount,
# newFunc.func_code.co_nlocals,
# newFunc.func_code.co_stacksize,
# newFunc.func_code.co_flags,
# newFunc.func_code.co_code,
# newFunc.func_code.co_consts,
# newFunc.func_code.co_names,
# newFunc.func_code.co_varnames,
# # Use the oldFunc's filename here. Tricky!
# oldFunc.func_code.co_filename,
# newFunc.func_code.co_name,
# newFunc.func_code.co_firstlineno,
# newFunc.func_code.co_lnotab)
#newFunc = types.FunctionType(newCode,
# newFunc.func_globals,
# newFunc.func_name,
# newFunc.func_defaults,
# newFunc.func_closure)
replaceFuncList.append((oldFunc, funcName, newFunc))
else:
# TODO: give these new functions a proper code filename
newFuncList.append((funcName, newFunc))
# Look in the messenger, taskMgr, and other globals that store func
# pointers to see if this old function pointer is stored there, and
# update it to the new function pointer.
replaceMessengerFunc(replaceFuncList)
replaceTaskMgrFunc(replaceFuncList)
replaceStateFunc(replaceFuncList)
replaceCRFunc(replaceFuncList)
replaceAIRFunc(replaceFuncList)
replaceIvalFunc(replaceFuncList)
# Now that we've the globals funcs, actually swap the pointers in
# the new class to the new functions
for oldFunc, funcName, newFunc in replaceFuncList:
# print "replacing old func: ", oldFunc, funcName, newFunc
setattr(toClass, funcName, newFunc)
# Add the brand new functions too
for funcName, newFunc in newFuncList:
# print "adding new func: ", oldFunc, funcName, newFunc
setattr(toClass, funcName, newFunc)
[docs]def replaceMessengerFunc(replaceFuncList):
try:
messenger
except:
return
for oldFunc, funcName, newFunc in replaceFuncList:
res = messenger.replaceMethod(oldFunc, newFunc)
if res:
print('replaced %s messenger function(s): %s' % (res, funcName))
[docs]def replaceTaskMgrFunc(replaceFuncList):
try:
taskMgr
except:
return
for oldFunc, funcName, newFunc in replaceFuncList:
if taskMgr.replaceMethod(oldFunc, newFunc):
print('replaced taskMgr function: %s' % funcName)
[docs]def replaceStateFunc(replaceFuncList):
if not sys.modules.get('base.direct.fsm.State'):
return
from direct.fsm.State import State
for oldFunc, funcName, newFunc in replaceFuncList:
res = State.replaceMethod(oldFunc, newFunc)
if res:
print('replaced %s FSM transition function(s): %s' % (res, funcName))
[docs]def replaceCRFunc(replaceFuncList):
try:
base.cr
except:
return
# masad: Gyedo's fake cr causes a crash in followingreplaceMethod on rebinding, so
# I throw in the isFake check. I still think the fake cr should be eliminated.
if hasattr(base.cr,'isFake'):
return
for oldFunc, funcName, newFunc in replaceFuncList:
if base.cr.replaceMethod(oldFunc, newFunc):
print('replaced DistributedObject function: %s' % funcName)
[docs]def replaceAIRFunc(replaceFuncList):
try:
simbase.air
except:
return
for oldFunc, funcName, newFunc in replaceFuncList:
if simbase.air.replaceMethod(oldFunc, newFunc):
print('replaced DistributedObject function: %s' % funcName)
[docs]def replaceIvalFunc(replaceFuncList):
# Make sure we have imported IntervalManager and thus created
# a global ivalMgr.
if not sys.modules.get('base.direct.interval.IntervalManager'):
return
from direct.interval.FunctionInterval import FunctionInterval
for oldFunc, funcName, newFunc in replaceFuncList:
res = FunctionInterval.replaceMethod(oldFunc, newFunc)
if res:
print('replaced %s interval function(s): %s' % (res, funcName))
