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'''
Field coercian routines.
To replace the field coercian routines, you must edit
basenodes.py and node.py to import some other coercian
routines. Basenodes.py is for use by the parser, node
is used by each node as it checks the validity of its
attributes.
'''
import types, sys, string
from utils import typeclasses, collapse
class FieldCoercian:
'''
A Field Coercian class allows for creating new behaviours
when dealing with the conversion of fields to-and-from
particular field types. This allows the programmer to
use alternate representations of fields (such as matrix arrays)
'''
def SFString( self, someobj, targetType=types.StringType, targetName='SFString', convertfunc=str ):
'''
Allowable types:
simple string -> unchanged
instance ( an IS ) -> unchanged
sequence of length == 1 where first element is a string -> returns first element
sequence of length > 1 where all elements are strings -> returns string.join( someobj, '')
'''
t = type(someobj)
if t is targetType:
return someobj
if t in typeclasses.SequenceTypes:
if len( someobj) == 1 and type( someobj[0] ) is targetType:
return someobj[0] #
elif len(someobj) > 1:
try:
return string.join( someobj, '')
except:
pass # is not a sequence of strings...
### if we get here, then an incorrect value was passed
raise ValueError, """Attempted to set value for an %s field which is not compatible: %s"""%( targetName, `someobj` )
def MFString( self, someobj, targetType=types.StringType, targetName='SFString', convertfunc=str ):
'''
Allowable Types:
simple string -> wrapped in a list
instance (an IS ) -> unchanged
sequence of strings (of any length) -> equivalent list returned
'''
t = type(someobj)
if t is targetType: # a bare string...
return [someobj]
elif t in typeclasses.SequenceTypes: # is a sequence
if not filter( lambda x, t=targetType: x is not t, map( type, someobj) ): # are all strings...
if t is not types.ListType:
return list( someobj )
else:
return someobj
### if we get here, then an incorrect value was passed
raise ValueError, """Attempted to set value for an %s field which is not compatible: %s"""%( targetName, `someobj` )
def SFBool( self, someobj, targetType=types.IntType, targetName='SFBool', convertfunc=int):
'''
Allowable Types:
instance (an IS) -> unchanged
Any object which is testable for truth/falsehood -> 1 or 0 respectively
SFBool should always succeed
'''
if (type(someobj) in typeclasses.SequenceTypes):
try:
if hasattr( someobj[0], '__gi__'):
return someobj[0]
else:
someobj = someobj[0]
except IndexError: # is a null MFNode
pass
if someobj:
return 1
else:
return 0
def SFNode( self, someobj, targetType=types.InstanceType, targetName='SFNode', convertfunc=None):
'''
Allowable Types:
instance of a Node -> unchanged
instance (an IS or USE) -> unchanged
sequence of length == 1 where first element is as above -> return first element
'''
if hasattr( someobj, '__gi__'): # about the only test I have without requiring that elements inherit from Node
return someobj
elif (type(someobj) in typeclasses.SequenceTypes):
try:
if hasattr( someobj[0], '__gi__'):
return someobj[0]
except IndexError: # is a null MFNode
pass
raise ValueError, """Attempted to set value for an %s field which is not compatible: %s"""%( targetName, `someobj` )
def MFNode( self, someobj, targetType=types.InstanceType, targetName='MFNode', convertfunc=None):
'''
Allowable Types:
instance (an IS) -> unchanged
instance of a Node -> wrapped with a list
sequence where all elements are nodes -> returned as list of same
'''
if hasattr( someobj, '__gi__') and someobj.__gi__ != "IS":
# is this a bare SFNode? wrap with a list and return
return [someobj]
elif hasattr( someobj, "__gi__"): # is this an IS node
return someobj
elif type(someobj) in typeclasses.SequenceTypes:
try:
map( getattr, someobj, ['__gi__']*len(someobj) )
# is this an IS node wrapped in a list?
if len(someobj) == 1 and someobj[0].__gi__ == "IS":
return someobj[0]
# okay, assume is really nodes...
if type(someobj) is types.ListType:
return someobj
else:
return list(someobj)
except AttributeError: # something isn't a node
pass
raise ValueError, """Attempted to set value for an %s field which is not compatible: %s"""%( targetName, `someobj` )
def SFNumber( self, someobj, targetType, targetName, convertfunc=int ):
'''
Allowable Types:
bare number -> numerically coerced to correct type
instance ( an IS ) -> unchanged
sequence of length == 1 where first element is a string -> returns first element
'''
t = type(someobj)
if t is targetType or t is types.InstanceType:
return someobj
elif t in typeclasses.NumericTypes:
return convertfunc( someobj)
elif t in typeclasses.SequenceTypes:
if len( someobj) == 1 and type( someobj[0] ):
return convertfunc( someobj[0] ) #
### if we get here, then an incorrect value was passed
raise ValueError, """Attempted to set value for an %s field which is not compatible: %s"""%( targetName, `someobj` )
def MFInt32 ( self, someobject ):
''' Convert value into a MFInt32 field value (preferably an array, otherwise a list of integers) '''
t = type(someobject)
value = None
if t in typeclasses.SequenceTypes: # is a sequence
try:
value = map( int, someobject)
except:
try:
value = map( int, collapse.collapse2_safe( someobject) )
except:
pass
elif t in typeclasses.NumericTypes or t is types.StringType:
value = [int(someobject)]
if value is None:
### if we get here, then an incorrect value was passed
raise ValueError, """Attempted to set value for an %s field which is not compatible: %s"""%( targetName, `someobj` )
return value
SFImage = MFInt32
def MFFloat( self, someobject ):
''' Convert value into a MFFloat field value (preferably an array, otherwise a list of integers) '''
t = type(someobject)
value = None
if t in typeclasses.SequenceTypes: # is a sequence
try:
value = map( float, someobject)
except:
try:
value = map( float, collapse.collapse2_safe( someobject))
except:
pass
elif t in typeclasses.NumericTypes or t is types.StringType:
value = [float(someobj)]
if value is None:
### if we get here, then an incorrect value was passed
raise ValueError, """Attempted to set value for an %s field which is not compatible: %s"""%( targetName, `someobj` )
return value
def SFVec3f (self, value):
''' Create a new SFVec3f value from value '''
t = type(value)
try:
value = x,y,z = map (float, value)
except ValueError:
try:
value = (x,y,z) = map( float, value[0] )
except (IndexError, ValueError):
raise ValueError (''' Invalid value for field type SFVec3f: %s'''%(value))
return value
def SFRotation(self, value):
''' Create a new SFRotation value from value '''
t = type(value)
try:
value = x,y,z, a = map (float, value)
except ValueError:
try:
value = (x,y,z, a) = map( float, value[0] )
except (IndexError, ValueError):
raise ValueError (''' Invalid value for field type SFRotation: %s'''%(value))
# get the normalized vector for x,y,z
## length = (x*x+y*y+z*z)**.5 or 0.0000
## value = (x/length,y/length,z/length, a)
return value
def SFVec2f (self, value):
''' Create a new SFVec3f value from value '''
t = type(value)
try:
value = x,y = map (float, value)
except ValueError:
try:
value = (x,y) = map( float, value[0] )
except (IndexError, ValueError):
raise ValueError (''' Invalid value for field type SFVec3f: %s'''%(value))
return value
def SFColor(self, value):
''' Create a new SFVec3f value from value '''
t = type(value)
try:
r,g,b = map (float, value)
except ValueError:
try:
r,g,b = map( float, value[0] )
except (IndexError, ValueError):
raise ValueError (''' Invalid value for field type SFColor: %s'''%(value))
r = max( (0.0, min((r,1.0))) )
g = max( (0.0, min((g,1.0))) )
b = max( (0.0, min((b,1.0))) )
return value
def MFCompoundNumber( self, someobj, targetName='SFVec3f', convertfunc=float, type=type):
'''
Allowable Types:
instance ( an IS ) -> unchanged
# instance ( a matrix ) -> reshaped (eventually)
list of lists, sub-sequences of proper length -> unchanged
sequence of numeric types of proper length -> converted to list, diced
'''
## if targetName == 'SFColor':
## import pdb
## pdb.set_trace()
converter = getattr( self, targetName )
t = type( someobj)
reporterror = 0
if t is types.InstanceType:
return someobj
elif t in typeclasses.SequenceTypes:
if not someobj:
return []
if type( someobj[0] ) is not types.StringType and type( someobj[0] ) in typeclasses.SequenceTypes:
try:
return map( converter, someobj )
except ValueError:
pass
elif type( someobj[0] ) in typeclasses.NumericTypes or type( someobj[0] ) is types.StringType:
# a single-level list?
base = map( convertfunc, someobj )
# if we get here, someobj is a list
if targetName[-2:] == '2f': # vec2f
tlen = 2
elif targetName[-2:] == 'on': # rotation
tlen = 4
else:
tlen = 3
value = []
while base:
value.append( converter( base[:tlen]) )
del base[:tlen]
return value
raise ValueError, """Attempted to set value for an %s field which is not compatible: %s"""%( targetName, `someobj` )
def __call__( self, someobj, targetName):
func, args = self.algomap[targetName]
## try:
## if targetName == 'SFInt32':
## import pdb
## pdb.set_trace()
if hasattr( someobj, "__gi__") and someobj.__gi__ == "IS":
return someobj
else:
return apply( func, (self, someobj)+args )
## except TypeError:
## print someobj, targetName
## print func, args
## raise
algomap = { \
'SFString': (SFString, (types.StringType, 'SFString', str)), \
'MFString': (MFString, (types.StringType, 'MFString', str)), \
'SFInt32': (SFNumber, (types.IntType, 'SFInt32', int)), \
'SFFloat': (SFNumber, (types.FloatType, 'SFFloat', float)), \
'SFTime': (SFNumber, (types.FloatType, 'SFFloat', float)), \
'SFColor': (SFColor, ()), \
'SFVec2f': (SFVec2f, ()), \
'SFVec3f': (SFVec3f, ()), \
'SFNode': (SFNode, (types.InstanceType, 'SFNode', None)), \
'SFBool': (SFBool, (types.IntType, 'SFBool', int)), \
'SFNode': (SFNode, (types.InstanceType, 'SFNode', None)), \
'MFInt32': (MFInt32, ()), \
'SFImage': (MFInt32, ()), \
'MFTime': (MFFloat, ()), \
'MFFloat': (MFFloat, ()), \
'MFColor': (MFCompoundNumber, ('SFColor', float)), \
'MFVec2f': (MFCompoundNumber, ('SFVec2f', float)), \
'MFVec3f': (MFCompoundNumber, ('SFVec3f', float)), \
'SFRotation': (SFRotation, ()), \
'MFRotation': (MFCompoundNumber, ('SFRotation', float)), \
'MFNode': (MFNode, (types.InstanceType, 'MFNode', None)) \
}
FIELDCOERCE = FieldCoercian ()
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