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"""Functions for encoding and decoding strings."""
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
from . import types as t
ENCODING = 'utf-8'
Text = type(u'')
def to_optional_bytes(value, errors='strict'): # type: (t.Optional[t.AnyStr], str) -> t.Optional[bytes]
"""Return the given value as bytes encoded using UTF-8 if not already bytes, or None if the value is None."""
return None if value is None else to_bytes(value, errors)
def to_optional_text(value, errors='strict'): # type: (t.Optional[t.AnyStr], str) -> t.Optional[t.Text]
"""Return the given value as text decoded using UTF-8 if not already text, or None if the value is None."""
return None if value is None else to_text(value, errors)
def to_bytes(value, errors='strict'): # type: (t.AnyStr, str) -> bytes
"""Return the given value as bytes encoded using UTF-8 if not already bytes."""
if isinstance(value, bytes):
return value
if isinstance(value, Text):
return value.encode(ENCODING, errors)
raise Exception('value is not bytes or text: %s' % type(value))
def to_text(value, errors='strict'): # type: (t.AnyStr, str) -> t.Text
"""Return the given value as text decoded using UTF-8 if not already text."""
if isinstance(value, bytes):
return value.decode(ENCODING, errors)
if isinstance(value, Text):
return value
raise Exception('value is not bytes or text: %s' % type(value))
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