RF: Specify spatial dims in each class

Author: effigies

nibabel/analyze.py

@@ -911,6 +911,7 @@ class AnalyzeImage(SpatialImage):
     files_types = (('image', '.img'), ('header', '.hdr'))
     valid_exts = ('.img', '.hdr')
     _compressed_suffixes = ('.gz', '.bz2')
+    _spatial_dims = slice(0, 3)
 
     makeable = True
     rw = True

nibabel/ecat.py

@@ -740,6 +740,7 @@ class EcatImage(SpatialImage):
     valid_exts = ('.v',)
     _subheader = EcatSubHeader
     files_types = (('image', '.v'), ('header', '.v'))
+    _spatial_dims = slice(0, 3)
 
     ImageArrayProxy = EcatImageArrayProxy
 

nibabel/freesurfer/mghformat.py

@@ -507,6 +507,7 @@ class MGHImage(SpatialImage):
     ImageOpener.compress_ext_map['.mgz'] = ImageOpener.gz_def
     files_types = (('image', '.mgh'),)
     _compressed_suffixes = ()
+    _spatial_dims = slice(0, 3)
 
     makeable = True
     rw = True

nibabel/parrec.py

@@ -1222,6 +1222,7 @@ class PARRECImage(SpatialImage):
     header_class = PARRECHeader
     valid_exts = ('.rec', '.par')
     files_types = (('image', '.rec'), ('header', '.par'))
+    _spatial_dims = slice(0, 3)
 
     makeable = False
     rw = False

nibabel/spatialimages.py

@@ -325,9 +325,7 @@ class ImageDataError(Exception):
 class SpatialImage(DataobjImage):
     ''' Template class for volumetric (3D/4D) images '''
     header_class = SpatialHeader
-    # Make a strong assumption that the first three dimensions are spatial
-    # Subclasses/images for which this is not true should change this attribute
-    _spatial_dims = slice(0, 3)
+    _spatial_dims = None
 
     class Slicer(object):
         ''' Slicing interface that returns a new image with an updated affine