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Mini Shell
from .core import encode, decode, alabel, ulabel, IDNAError
import codecs
import re
from typing import Tuple, Optional
_unicode_dots_re = re.compile('[\u002e\u3002\uff0e\uff61]')
class Codec(codecs.Codec):
def encode(self, data: str, errors: str = 'strict') -> Tuple[bytes, int]:
if errors != 'strict':
raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
if not data:
return b"", 0
return encode(data), len(data)
def decode(self, data: bytes, errors: str = 'strict') -> Tuple[str, int]:
if errors != 'strict':
raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
if not data:
return '', 0
return decode(data), len(data)
class IncrementalEncoder(codecs.BufferedIncrementalEncoder):
def _buffer_encode(self, data: str, errors: str, final: bool) -> Tuple[str, int]: # type: ignore
if errors != 'strict':
raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
if not data:
return "", 0
labels = _unicode_dots_re.split(data)
trailing_dot = ''
if labels:
if not labels[-1]:
trailing_dot = '.'
del labels[-1]
elif not final:
# Keep potentially unfinished label until the next call
del labels[-1]
if labels:
trailing_dot = '.'
result = []
size = 0
for label in labels:
result.append(alabel(label))
if size:
size += 1
size += len(label)
# Join with U+002E
result_str = '.'.join(result) + trailing_dot # type: ignore
size += len(trailing_dot)
return result_str, size
class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
def _buffer_decode(self, data: str, errors: str, final: bool) -> Tuple[str, int]: # type: ignore
if errors != 'strict':
raise IDNAError('Unsupported error handling \"{}\"'.format(errors))
if not data:
return ('', 0)
labels = _unicode_dots_re.split(data)
trailing_dot = ''
if labels:
if not labels[-1]:
trailing_dot = '.'
del labels[-1]
elif not final:
# Keep potentially unfinished label until the next call
del labels[-1]
if labels:
trailing_dot = '.'
result = []
size = 0
for label in labels:
result.append(ulabel(label))
if size:
size += 1
size += len(label)
result_str = '.'.join(result) + trailing_dot
size += len(trailing_dot)
return (result_str, size)
class StreamWriter(Codec, codecs.StreamWriter):
pass
class StreamReader(Codec, codecs.StreamReader):
pass
def getregentry() -> codecs.CodecInfo:
# Compatibility as a search_function for codecs.register()
return codecs.CodecInfo(
name='idna',
encode=Codec().encode, # type: ignore
decode=Codec().decode, # type: ignore
incrementalencoder=IncrementalEncoder,
incrementaldecoder=IncrementalDecoder,
streamwriter=StreamWriter,
streamreader=StreamReader,
)
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