118 lines
3.2 KiB
Python
118 lines
3.2 KiB
Python
from .core import encode, decode, alabel, ulabel, IDNAError
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import codecs
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import re
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_unicode_dots_re = re.compile(u'[\u002e\u3002\uff0e\uff61]')
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class Codec(codecs.Codec):
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def encode(self, data, errors='strict'):
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if errors != 'strict':
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raise IDNAError("Unsupported error handling \"{0}\"".format(errors))
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if not data:
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return "", 0
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return encode(data), len(data)
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def decode(self, data, errors='strict'):
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if errors != 'strict':
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raise IDNAError("Unsupported error handling \"{0}\"".format(errors))
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if not data:
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return u"", 0
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return decode(data), len(data)
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class IncrementalEncoder(codecs.BufferedIncrementalEncoder):
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def _buffer_encode(self, data, errors, final):
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if errors != 'strict':
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raise IDNAError("Unsupported error handling \"{0}\"".format(errors))
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if not data:
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return ("", 0)
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labels = _unicode_dots_re.split(data)
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trailing_dot = u''
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if labels:
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if not labels[-1]:
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trailing_dot = '.'
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del labels[-1]
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elif not final:
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# Keep potentially unfinished label until the next call
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del labels[-1]
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if labels:
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trailing_dot = '.'
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result = []
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size = 0
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for label in labels:
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result.append(alabel(label))
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if size:
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size += 1
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size += len(label)
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# Join with U+002E
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result = ".".join(result) + trailing_dot
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size += len(trailing_dot)
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return (result, size)
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class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
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def _buffer_decode(self, data, errors, final):
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if errors != 'strict':
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raise IDNAError("Unsupported error handling \"{0}\"".format(errors))
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if not data:
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return (u"", 0)
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# IDNA allows decoding to operate on Unicode strings, too.
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if isinstance(data, unicode):
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labels = _unicode_dots_re.split(data)
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else:
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# Must be ASCII string
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data = str(data)
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unicode(data, "ascii")
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labels = data.split(".")
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trailing_dot = u''
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if labels:
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if not labels[-1]:
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trailing_dot = u'.'
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del labels[-1]
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elif not final:
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# Keep potentially unfinished label until the next call
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del labels[-1]
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if labels:
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trailing_dot = u'.'
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result = []
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size = 0
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for label in labels:
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result.append(ulabel(label))
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if size:
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size += 1
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size += len(label)
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result = u".".join(result) + trailing_dot
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size += len(trailing_dot)
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return (result, size)
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class StreamWriter(Codec, codecs.StreamWriter):
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pass
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class StreamReader(Codec, codecs.StreamReader):
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pass
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def getregentry():
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return codecs.CodecInfo(
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name='idna',
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encode=Codec().encode,
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decode=Codec().decode,
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incrementalencoder=IncrementalEncoder,
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incrementaldecoder=IncrementalDecoder,
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streamwriter=StreamWriter,
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streamreader=StreamReader,
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)
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