[x3d-public] x3d.py problem validating MFVec2f (non-specified crossSection) default value

[John Carlson]

The most important thing is last in this email, problems validating default
MFVec2f crossSection field in x3d.py.  The rest of the email is background.

To get x3d.py (x3djsonld.py) to handle HelloWorldProgramOutput.json,  I had
to remove Extrusions from the example, and change to Spheres.

Below is the change to the example to make it work:

diff /c/x3d-code/
www.web3d.org/x3d/stylesheets/java/examples/HelloWorldProgramOutput.json
HelloWorldProgramOutput.json
1135c1135
<                 { "Extrusion":
---
>                 { "Sphere":
2392c2392
<                 { "Extrusion":
---
>                 { "Sphere":
2693c2693
< }
\ No newline at end of file
---
> }
============================================================
If one does not make the change to the JSON file, the following error
appears.  x3djsonld.py is in X3DJSONLD/src/main/python.

$ python x3djsonld.py
'''
x3d.py package 4.0.63.7 loaded, have fun with X3D Graphics!
'''
from x3d import *
from x3d import SFBool
print(
Traceback (most recent call last):
  File "C:\Users\john\X3DJSONLD\src\main\python\x3d.py", line 4668, in
assertValidMFVec2f
    MFVec2f(value)
  File "C:\Users\john\X3DJSONLD\src\main\python\x3d.py", line 9184, in
__init__
    self.value = value
  File "C:\Users\john\X3DJSONLD\src\main\python\x3d.py", line 9206, in value
    value = [(x, y) for x, y, in value]
  File "C:\Users\john\X3DJSONLD\src\main\python\x3d.py", line 9206, in
<listcomp>
    value = [(x, y) for x, y, in value]
ValueError: too many values to unpack (expected 2)

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:\Users\john\X3DJSONLD\src\main\python\x3djsonld.py", line 256, in
<module>
    print(parseObject("X3D", data, 0))
  File "C:\Users\john\X3DJSONLD\src\main\python\x3djsonld.py", line 178, in
parseObject
    out += parseObject(k, v,indent+1)
  File "C:\Users\john\X3DJSONLD\src\main\python\x3djsonld.py", line 163, in
parseObject
    out += parseObject(k, v,indent+1)
  File "C:\Users\john\X3DJSONLD\src\main\python\x3djsonld.py", line 192, in
parseObject
    out += parseArray("[", "]", parent, key, v,indent+1, fieldType)
  File "C:\Users\john\X3DJSONLD\src\main\python\x3djsonld.py", line 57, in
parseArray
    out += parseObject(parent, d,indent+1)
  File "C:\Users\john\X3DJSONLD\src\main\python\x3djsonld.py", line 178, in
parseObject
    out += parseObject(k, v,indent+1)
  File "C:\Users\john\X3DJSONLD\src\main\python\x3djsonld.py", line 175, in
parseObject
    out += parseObject(k, v,indent+1)
  File "C:\Users\john\X3DJSONLD\src\main\python\x3djsonld.py", line 178, in
parseObject
    out += parseObject(k, v,indent+1)
  File "C:\Users\john\X3DJSONLD\src\main\python\x3djsonld.py", line 125, in
parseObject
    fieldInfo = getField(parent, key)
  File "C:\Users\john\X3DJSONLD\src\main\python\x3djsonld.py", line 14, in
getField
    cls = eval(grandparent)()
  File "C:\Users\john\X3DJSONLD\src\main\python\x3d.py", line 38948, in
__init__
    self.crossSection = crossSection
  File "C:\Users\john\X3DJSONLD\src\main\python\x3d.py", line 39005, in
crossSection
    assertValidMFVec2f(crossSection)
  File "C:\Users\john\X3DJSONLD\src\main\python\x3d.py", line 4672, in
assertValidMFVec2f
    raise X3DTypeError(str(value)[:100] + ' has type ' + str(type(value)) +
' but is not a valid MFVec2f') from error
x3d.X3DTypeError: [(1, 1, 1, -1, -1, -1, -1, 1, 1, 1)] has type <class
'list'> but is not a valid MFVec2f
============================================================
What's wrong with the is handling the Extrusion when crossSection is not
set, thus x3d.py:

    @crossSection.setter
    def crossSection(self, crossSection):
        if  crossSection is None:
            crossSection = [(1, 1, 1, -1, -1, -1, -1, 1, 1, 1)] # default
        assertValidMFVec2f(crossSection)
        self.__crossSection = crossSection

Note that crossSection's default is not correct.

Thanks for any fixes to x3d.py.  I will try to fix it now.

John
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