Coverage for /usr/lib/python3/dist-packages/scipy/io/matlab/byteordercodes.py : 39%

''' Byteorder utilities for system - numpy byteorder encoding 

Converts a variety of string codes for little endian, big endian, 

native byte order and swapped byte order to explicit numpy endian 

codes - one of '<' (little endian) or '>' (big endian) 

''' 

from __future__ import division, print_function, absolute_import 

import sys 

sys_is_le = sys.byteorder == 'little' 

native_code = sys_is_le and '<' or '>' 

swapped_code = sys_is_le and '>' or '<' 

aliases = {'little': ('little', '<', 'l', 'le'), 

'big': ('big', '>', 'b', 'be'), 

'native': ('native', '='), 

'swapped': ('swapped', 'S')} 

def to_numpy_code(code): 

""" 

Convert various order codings to numpy format. 

Parameters 

---------- 

code : str 

The code to convert. It is converted to lower case before parsing. 

Legal values are: 

'little', 'big', 'l', 'b', 'le', 'be', '<', '>', 'native', '=', 

'swapped', 's'. 

Returns 

------- 

out_code : {'<', '>'} 

Here '<' is the numpy dtype code for little endian, 

and '>' is the code for big endian. 

Examples 

-------- 

>>> import sys 

>>> sys_is_le == (sys.byteorder == 'little') 

True 

>>> to_numpy_code('big') 

'>' 

>>> to_numpy_code('little') 

'<' 

>>> nc = to_numpy_code('native') 

>>> nc == '<' if sys_is_le else nc == '>' 

True 

>>> sc = to_numpy_code('swapped') 

>>> sc == '>' if sys_is_le else sc == '<' 

True 

""" 

code = code.lower() 

if code is None: 

return native_code 

if code in aliases['little']: 

return '<' 

elif code in aliases['big']: 

return '>' 

elif code in aliases['native']: 

return native_code 

elif code in aliases['swapped']: 

return swapped_code 

else: 

raise ValueError( 

'We cannot handle byte order %s' % code)