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.

       When proposing code changes, please provide unified diffs, i.e the output of diff -u.

       Note  further  that  attachments  are strongly preferred over inlined patches. Attachments can be made by
       going to the Edit form of the ticket immediately after its creation, and then using the left-most  button
       in the secondary navigation bar.

KEYWORDS

       stringprep, unicode

COPYRIGHT

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