mirror of
https://github.com/Sneed-Group/Poodletooth-iLand
synced 2024-12-27 05:32:41 -06:00
269 lines
11 KiB
Python
269 lines
11 KiB
Python
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from new import instance
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import FFIConstants
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WrapperClassMap = {}
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DowncastMap = {}
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# For testing, you can turn verbose and debug on
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# FFIConstants.notify.setInfo(1)
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# FFIConstants.notify.setDebug(1)
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# Uncomment the notify statements if you need to debug,
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# otherwise leave them commented out to prevent runtime
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# overhead of calling them
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# Register a python class in the type map if it is a typed object
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# The type map is used for upcasting and downcasting through
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# the panda inheritance chain
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def registerInTypeMap(pythonClass):
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from pandac import TypedObject
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if issubclass(pythonClass, TypedObject.TypedObject):
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typeIndex = pythonClass.getClassType().getIndex()
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WrapperClassMap[typeIndex] = pythonClass
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def funcToMethod(func, clas, method_name=None):
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"""Adds func to class so it is an accessible method; use method_name to specify the name to be used for calling the method.
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The new method is accessible to any instance immediately."""
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func.im_class=clas
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func.im_func=func
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func.im_self=None
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if not method_name:
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clas.__dict__[method_name]=func
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else:
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clas.__dict__[func.__name__]=func
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def FFIInstance(classdef, this = 0, userManagesMemory = 0):
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answer = instance(classdef)
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answer.this = this
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answer.userManagesMemory = userManagesMemory
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return answer
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class FFIExternalObject:
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def __init__(self, *_args):
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# By default, we do not manage our own memory
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self.userManagesMemory = 0
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# Start with a null this pointer
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self.this = 0
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def destructor(self):
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# Base destructor in case you do not define one
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pass
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def getLineage(self, thisClass, targetBaseClass):
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# Recursively determine the path in the heirarchy tree from thisClass
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# to the targetBaseClass
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return self.getLineageInternal(thisClass, targetBaseClass, [thisClass])
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def getLineageInternal(self, thisClass, targetBaseClass, chain):
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# Recursively determine the path in the heirarchy tree from thisClass
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# to the targetBaseClass
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#FFIConstants.notify.debug('getLineageInternal: checking %s to %s'
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# % (thisClass.__name__, targetBaseClass.__name__))
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if (targetBaseClass in thisClass.__bases__):
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# Found a link
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return chain + [targetBaseClass]
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elif (len(thisClass.__bases__) == 0):
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# No possible links
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return 0
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else:
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# recurse
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for base in thisClass.__bases__:
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res = self.getLineageInternal(base, targetBaseClass, chain+[base])
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if res:
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# FFIConstants.notify.debug('getLineageInternal: found path: ' + repr(res))
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return res
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# Not found anywhere
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return 0
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def getDowncastFunctions(self, thisClass, baseClass):
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#FFIConstants.notify.debug(
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# 'getDowncastFunctions: Looking for downcast function from %s to %s'
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# % (baseClass.__name__, thisClass.__name__))
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lineage = self.getLineage(thisClass, baseClass)
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# Start with an empty list of downcast functions
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downcastFunctionList = []
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# If it could not find the baseClass anywhere in the lineage,
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# return empty
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if not lineage:
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return []
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# Walk along the lineage looking for downcast functions from
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# class to class+1. Start at the top and work downwards.
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top = len(lineage) - 1
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for i in range(top):
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toClass = lineage[top - i - 1]
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fromClass = lineage[top - i]
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downcastFuncName = ('downcastTo' + toClass.__name__
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+ 'From' + fromClass.__name__)
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# Look over this classes global modules dictionaries
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# for the downcast function name
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for globmod in toClass.__CModuleDowncasts__:
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func = globmod.__dict__.get(downcastFuncName)
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if func:
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#FFIConstants.notify.debug(
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# 'getDowncastFunctions: Found downcast function %s in %s'
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# % (downcastFuncName, globmod.__name__))
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downcastFunctionList.append(func)
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return downcastFunctionList
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def lookUpNewType(self, typeHandle, rootType):
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# We tried to downcast to an unknown type. Try to figure out
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# the lowest type we *do* know, so we can downcast to that
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# type instead.
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if typeHandle.getNumParentClasses() == 0:
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# This type has no parents! That shouldn't happen.
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FFIConstants.notify.warning("Unknown class type: %s has no parents!" % (typeHandle.getName()))
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return None
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parentType = typeHandle.getParentTowards(rootType, self)
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parentIndex = parentType.getIndex()
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parentWrapperClass = WrapperClassMap.get(parentIndex)
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if parentWrapperClass == None:
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parentWrapperClass = self.lookUpNewType(parentType, rootType)
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if parentWrapperClass != None:
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# If the parent class is known, then record that this
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# class is a derivation of that parent class.
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WrapperClassMap[typeHandle.getIndex()] = parentWrapperClass
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return parentWrapperClass
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def setPointer(self):
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# See what type it really is and downcast to that type (if necessary)
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# Look up the TypeHandle in the dict. get() returns None if it is not there
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index = self.getTypeIndex()
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exactWrapperClass = WrapperClassMap.get(index)
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if exactWrapperClass == None:
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# This is an unknown class type. Perhaps it derives from
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# a class type we know.
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exactWrapperClass = self.lookUpNewType(self.getType(), self.getClassType())
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# We do not need to downcast if we already have the same class
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if (exactWrapperClass and (exactWrapperClass != self.__class__)):
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# Create a new wrapper class instance
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#exactObject = exactWrapperClass(None)
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exactObject = FFIInstance(exactWrapperClass)
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# Get the downcast pointer that has had all the downcast
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# funcs called
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downcastObject = self.downcast(exactWrapperClass)
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exactObject.this = downcastObject.this
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exactObject.userManagesMemory = downcastObject.userManagesMemory
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# Make sure the original downcast object does not get
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# garbage collected so that the exactObject will not get
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# gc'd thereby transferring ownership of the object to
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# this new exactObject
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downcastObject.userManagesMemory = 0
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return exactObject
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else:
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return self
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def downcast(self, toClass):
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fromClass = self.__class__
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#FFIConstants.notify.debug('downcast: downcasting from %s to %s' % \
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# (fromClass.__name__, toClass.__name__))
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# Check the cache to see if we have looked this up before
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downcastChain = DowncastMap.get((fromClass, toClass))
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if downcastChain == None:
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downcastChain = self.getDowncastFunctions(toClass, fromClass)
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#FFIConstants.notify.debug('downcast: computed downcast chain: ' + repr(downcastChain))
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# Store it for next time
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DowncastMap[(fromClass, toClass)] = downcastChain
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newObject = self
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for downcastFunc in downcastChain:
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#FFIConstants.notify.debug('downcast: downcasting %s using %s' % \
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# (newObject.__class__.__name__, downcastFunc))
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newObject = downcastFunc(newObject)
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return newObject
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def compareTo(self, other):
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# By default, we compare the C++ pointers
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# Some classes will override the compareTo operator with their own
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# logic in C++ (like vectors and matrices for instance)
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try:
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if self.this < other.this:
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return -1
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if self.this > other.this:
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return 1
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else:
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return 0
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except:
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return 1
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def __cmp__(self, other):
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# Only use the C++ compareTo if they are the same class
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if isinstance(other, self.__class__):
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return self.compareTo(other)
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# Otherwise, they must not be the same
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# Just do a basic python id compare
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else:
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return cmp(id(self), id(other))
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def __repr__(self):
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# Lots of Panda classes have an output function defined that takes an Ostream
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# We create a LineStream for the output function to write to, then we extract
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# the string out of it and return it as our str
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try:
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from pandac import LineStream
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lineStream = LineStream.LineStream()
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self.output(lineStream)
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baseRepr = lineStream.getLine()
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except AssertionError, e:
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raise AssertionError, e
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except:
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baseRepr = ('[' + self.__class__.__name__ + ' at: ' + repr(self.this) + ']')
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# In any case, return the baseRepr
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return baseRepr
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def __str__(self):
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# This is a more complete version of printing which shows the object type
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# and pointer, plus the output from write() or output() whichever is defined
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# Print this info for all objects
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baseRepr = ('[' + self.__class__.__name__ + ' at: ' + repr(self.this) + ']')
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# Lots of Panda classes have an write or output function defined that takes an Ostream
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# We create a LineStream for the write or output function to write to, then we extract
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# the string out of it and return it as our repr
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from pandac import LineStream
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lineStream = LineStream.LineStream()
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try:
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# First try the write function, that is the better one
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self.write(lineStream)
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while lineStream.isTextAvailable():
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baseRepr = baseRepr + '\n' + lineStream.getLine()
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except AssertionError, e:
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raise AssertionError, e
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except:
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try:
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# Sometimes write insists on a seconds parameter.
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self.write(lineStream, 0)
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while lineStream.isTextAvailable():
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baseRepr = baseRepr + '\n' + lineStream.getLine()
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except AssertionError, e:
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raise AssertionError, e
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except:
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try:
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# Ok, no write function, lets try output then
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self.output(lineStream)
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while lineStream.isTextAvailable():
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baseRepr = baseRepr + '\n' + lineStream.getLine()
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except AssertionError, e:
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raise AssertionError, e
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except:
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pass
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# In any case, return the baseRepr
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return baseRepr
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def __hash__(self):
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return self.this
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