stringprep -
Implementation of stringprep
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
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.
-
::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.
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
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"Preparation of Internationalized Strings ('stringprep')",
(http://www.ietf.org/rfc/rfc3454.txt)
-
"Nameprep: A Stringprep Profile for Internationalized Domain Names (IDN)",
(http://www.ietf.org/rfc/rfc3491.txt)
-
"Extensible Messaging and Presence Protocol (XMPP): Core",
(http://www.ietf.org/rfc/rfc3920.txt)
Sergei Golovan
This document, and the package it describes, will undoubtedly contain
bugs and other problems.
Please report such in the category
stringprep of the
http://sourceforge.net/tracker/?group_id=12883.
Please also report any ideas for enhancements you may have for either
package and/or documentation.
unicode(n)
stringprep, unicode