| ''' |
| Python2/Python3 compatibility utilities. |
| ''' |
|
|
| import sys |
| import warnings |
|
|
|
|
| class utf8reader: |
| """Takes a utf8-encoded string reader and reads bytes out of it""" |
|
|
| def __init__(self, str_reader): |
| self.str_reader = str_reader |
|
|
| def read(self, n): |
| return self.str_reader.read(n).encode('utf-8') |
|
|
| _str_vs_bytes_warning = ''' |
| ijson works by reading bytes, but a string reader has been given instead. This |
| probably, but not necessarily, means a file-like object has been opened in text |
| mode ('t') rather than binary mode ('b'). |
| |
| An automatic conversion is being performed on the fly to continue, but on the |
| other hand this creates unnecessary encoding/decoding operations that decrease |
| the efficiency of the system. In the future this automatic conversion will be |
| removed, and users will receive errors instead of this warning. To avoid this |
| problem make sure file-like objects are opened in binary mode instead of text |
| mode. |
| ''' |
|
|
| def _warn_and_return(o): |
| warnings.warn(_str_vs_bytes_warning, DeprecationWarning) |
| return o |
|
|
| def bytes_reader(f): |
| """Returns a file-like object that reads bytes""" |
| if type(f.read(0)) == bytes: |
| return f |
| return _warn_and_return(utf8reader(f)) |
