Source code for luna.pathology.common.EnsureByteContext

"""
Created on November 04, 2020

@author: aukermaa@mskcc.org
"""


class EnsureByteContext(object):
    def __enter__(self):
        # Re-import modules
        import builtins
        import io

        if not hasattr(builtins, "default_open"):
            # Backup open function as default_open
            print("Reconfigurating [builtins] to have default_open() attribute")
            builtins.default_open = builtins.open

        def io_open(*args, **kwargs):
            # Define new IO function
            print("__io_open__(): ", args, kwargs)
            if type(args[0]) == io.BytesIO:
                return io.BufferedReader(args[0])
            else:
                return builtins.default_open(*args, **kwargs)

        if not hasattr(builtins, "io_open"):
            # Set open as new
            print("Reconfigurating [builtins] to use io_open() attribute")
            builtins.io_open = io_open
            builtins.open = builtins.io_open
        return self

    def __exit__(self, type, value, traceback):
        return self