Ubuntu Manpage: stringprep - Implementation of stringprep

NAME

       stringprep - Implementation of stringprep

SYNOPSIS

       package require Tcl  8.3

       package require stringprep  1.0.1

       ::stringprep::register  profile  ?-mapping  list? ?-normalization form? ?-prohibited list?
       ?-prohibitedList list? ?-prohibitedCommand command? ?-prohibitedBidi boolean?

       ::stringprep::stringprep profile string

       ::stringprep::compare profile string1 string2

_________________________________________________________________________________________________

DESCRIPTION

       This is  an  implementation  in  Tcl  of  the  Preparation  of  Internationalized  Strings
       ("stringprep").  It  allows  to define stringprep profiles and use them to prepare Unicode
       strings for comparison as defined in RFC-3454.

COMMANDS

::stringprep::register profile ?-mapping list? ?-normalization form? ?-prohibited list?
?-prohibitedList list? ?-prohibitedCommand command? ?-prohibitedBidi boolean?
Register the stringprep profile named profile. Options are the following.

Option -mapping specifies stringprep mapping tables. This parameter takes list of
tables from appendix B of RFC-3454. The usual list values are {B.1 B.2} or {B.1
B.3} where B.1 contains characters which commonly map to nothing, B.3 specifies
case folding, and B.2 is used in profiles with unicode normalization form KC.
Defult value is {} which means no mapping.

Option -normalization takes a string and if it is nonempty then it uses as a name
of Unicode normalization form. Any value of "D", "C", "KD" or "KC" may be used,
though RFC-3454 defines only two options: no normalization or normalization using
form KC.

Option -prohibited takes a list of RFC-3454 tables with prohibited characters.
Current version does allow to prohibit either all tables from C.3 to C.9 or neither
of them. An example of this list for RFC-3491 is {A.1 C.1.2 C.2.2 C.3 C.4 C.5 C.6
C.7 C.8 C.9}.

Option -prohibitedList specifies a list of additional prohibited characters. The
list contains not characters themselves but their Unicode numbers. For example,
Nodeprep specification from RFC-3920 forbids the following codes: {0x22 0x26 0x27
0x2f 0x3a 0x3c 0x3e 0x40} (\" \& \' / : < > @).

Option -prohibitedCommand specifies a command which is called for every character
code in mapped and normalized string. If the command returns true then the
character is considered prohibited. This option is useful when a list for
-prohibitedList is too large.

Option -prohibitedBidi takes boolean value and if it is true then the bidirectional
character processing rules defined in section 6 of RFC-3454 are used.

::stringprep::stringprep profile string
Performs stringprep operations defined in profile profile to string string. Result
is a prepared string or one of the following errors: invalid_profile (profile
profile is not defined), prohibited_character (string string contains a prohibited
character) or prohibited_bidi (string string contains a prohibited bidirectional
sequence).

::stringprep::compare profile string1 string2
Compares two unicode strings prepared accordingly to stringprep profile profile.
The command returns 0 if prepared strings are equal, -1 if string1 is
lexicographically less than string2, or 1 if string1 is lexicographically greater
than string2.

EXAMPLES

       Nameprep profile definition (see RFC-3491):

              ::stringprep::register nameprep  -mapping {B.1 B.2}  -normalization KC  -prohibited {A.1 C.1.2 C.2.2 C.3 C.4 C.5 C.6 C.7 C.8 C.9}  -prohibitedBidi 1

       Nodeprep and resourceprep profile definitions (see RFC-3920):

              ::stringprep::register nodeprep  -mapping {B.1 B.2}  -normalization KC  -prohibited {A.1 C.1.1 C.1.2 C.2.1 C.2.2 C.3 C.4 C.5 C.6 C.7 C.8 C.9}  -prohibitedList {0x22 0x26 0x27 0x2f 0x3a 0x3c 0x3e 0x40}  -prohibitedBidi 1

              ::stringprep::register resourceprep  -mapping {B.1}  -normalization KC  -prohibited {A.1 C.1.2 C.2.1 C.2.2 C.3 C.4 C.5 C.6 C.7 C.8 C.9}  -prohibitedBidi 1

REFERENCES

       [1]    "Preparation        of       Internationalized       Strings       ('stringprep')",
              (http://www.ietf.org/rfc/rfc3454.txt)

       [2]    "Nameprep:  A  Stringprep  Profile  for  Internationalized  Domain  Names   (IDN)",
              (http://www.ietf.org/rfc/rfc3491.txt)

       [3]    "Extensible      Messaging     and     Presence     Protocol     (XMPP):     Core",
              (http://www.ietf.org/rfc/rfc3920.txt)

AUTHORS

       Sergei Golovan

BUGS, IDEAS, FEEDBACK

       This document, and the package it describes,  will  undoubtedly  contain  bugs  and  other
       problems.   Please  report  such  in  the  category  stringprep  of  the  Tcllib  Trackers
       [http://core.tcl.tk/tcllib/reportlist].  Please also report any ideas for enhancements you
       may have for either package and/or documentation.

KEYWORDS

       stringprep, unicode

COPYRIGHT

       Copyright (c) 2007-2009, Sergei Golovan <sgolovan@nes.ru>