def resolve(self, context, text, expression):
request = context.REQUEST
charsets = getattr(request, '__zpt_available_charsets', None)
if charsets is None:
charsets = IUserPreferredCharsets(request).getPreferredCharsets()
# add management_page_charset as one fallback
management_charset = getattr(context, 'management_page_charset',
None)
if management_charset:
charsets.append(management_charset)
# add Python's default encoding as last fallback
charsets.append(default_encoding)
# cache list of charsets
request.__zpt_available_charsets = charsets
for enc in charsets:
if enc == '*': continue
try:
return unicode(text, enc)
except (LookupError, UnicodeDecodeError):
pass
return text
