Class NamePrep

Implements preparation of internationalized domain names.

This class implements preparing internationalized domain names using the rules defined in RFC 3491, section 4 (Conversion operations).

We do not perform step 4 since we deal with unicode representations of domain names and do not convert from or to ASCII representations using punycode encoding. When such a conversion is needed, the L{idna} standard library provides the C{ToUnicode()} and C{ToASCII()} functions. Note that L{idna} itself assumes UseSTD3ASCIIRules to be false.

The following steps are performed by C{prepare()}:

• Split the domain name in labels at the dots (RFC 3490, 3.1)

• Apply nameprep proper on each label (RFC 3491)

• Enforce the restrictions on ASCII characters in host names by

  assuming STD3ASCIIRules to be true. (STD 3)

• Rejoin the labels using the label separator U+002E (full stop).