Source code for roster_core.punycode_lib
#!/usr/bin/python
# Copyright (c) 2010, Purdue University
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"""Punycode and Unicode convertor module for Roster"""
__copyright__ = 'Copyright (C) 2010, Purdue University'
__license__ = 'BSD'
__version__ = "#TRUNK#"
[docs]def Uni2Puny(unicode_string=None):
"""Converts a unicode domain into a punycoded domain.
Inputs:
unicode/string: String or unicode of domain.
Outputs:
string: A punycoded domain string.
"""
if( unicode_string == None ):
return
else:
try:
unicode_string = unicode_string.decode('utf-8')
except UnicodeEncodeError:
pass
## Split the domain name into levels.
unicode_string = unicode_string.split('.')
## For each level of the domain, check if it is unicode.
## If it is, Punycode the level.
punycode_string = ''
for level in unicode_string:
is_unicode = False
if( punycode_string != '' ):
punycode_string = '%s.' % (punycode_string)
for char in level:
if( ord(char) > 127 ):
is_unicode = True
break
if( is_unicode ):
punycode_string = 'xn--%s' % (punycode_string)
punycode_string = '%s%s' % (punycode_string, level.encode('punycode'))
else:
punycode_string = '%s%s' % (punycode_string, level.encode('utf-8'))
return punycode_string
[docs]def Puny2Uni(punycode_string=None):
"""Converts a Punycoded domain into a unicode domain.
Inputs:
string: Punycoded domain.
Outputs:
unicode: Decoded punycode domain.
"""
if( punycode_string == None ):
return
## Split the domain name into levels.
punycode_string = punycode_string.split('.')
## For each level of the domain, check if it is Punycode.
## If it is, decode it to unicode.
unicode_string = u''
for level in punycode_string:
if( unicode_string != '' ):
unicode_string = '%s.' % (unicode_string)
if( level.find('xn--') == 0 ):
level = level.replace('xn--','')
unicode_string = '%s%s' % (unicode_string, level.decode('punycode'))
else:
unicode_string = '%s%s' % (unicode_string, level)
return unicode_string