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Article contents:== Outdated egg! This is an egg for CHICKEN 3, the unsupported old release. You're almost certainly looking for [[/eggref/4/stringprep|the CHICKEN 4 version of this egg]], if it exists. If it does not exist, there may be equivalent functionality provided by another egg; have a look at the [[https://wiki.call-cc.org/chicken-projects/egg-index-4.html|egg index]]. Otherwise, please consider porting this egg to the current version of CHICKEN. [[tags: egg]] == stringprep === Introduction RFC 3454 Internationalized string preparation === Examples ; XMPP Nodeprep profile (define nodeprep (make-stringprepper (list appendix-b1 appendix-b2) ; Mappings #t ; Normalize (char-set-union appendix-c ; Forbid everything in Appendix C (char-set #\" #\& #\' #\/ #\: #\< #\> #\@)) ; And this stuff #t ; Bidirectional check)) === Authors Adam C. Emerson <azure@umich.edu> === License This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. === Requirements * [[utf8]] * [[unicode-normalization]] === make-stringprepper (make-stringprepper mappings normalize? prohibited bidi?) * mappings: list of mappings, where each mapping is either a char-set (each character found in the set is mapped to nothing) or a sorted vector (every element must be a pair with the car the character mapped from, the cdr either a character mapped to or a list of characters. The must be sorted in ascending order by the car). * normalize?: If true, normalize the string into NFKC. * prohibited: char-set of prhobitied characters. char-set-union is good to use here. * bidi?: If true, do the bidirectionality check. NOTE: The RFC requires that the characters in appendix-c8 must be prohibited if this check is performed. Thus, you will get an error if this flag is true and appendix-c8 is not a subset of your prohibited char-set. make-stringprepper returns a function from strings to strings. It will throw (exn invalid) if the string contains prohibited characters or fails the bidirectionality check. === appendix-b1 Mapping given in Table B.1 of Appendix B, "Commonly mapped to nothing." === appendix-b2 Mapping given in Table B.2 of Appendix B, "Mapping for case-folding used with NKFC." === appendix-b3 Mapping given in Table B.3 of Appendix B, "Mapping for case-folding used with no normalization." === appendix-c1.1 Character set given in Table C.1.1 of Appendix C, "ASCII space characters." === appendix-c1.2 Character set given in Table C.1.2 of Appendix C, "Non-ASCII space characters." === appendix-c1 Union of appendix-c1.1 and appendix-c1.2. === appendix-c2.1 Character set given in Table C.2.1 of Appendix C, "ASCII control characters." === appendix-c2.2 Character set given in Table C.2.2 of Appendix C, "Non-ASCII control characters." === appendic-c2 Union of appendix-c2.1 and appendix-c2.2 === appendix-c3 Character set given in Table C.3 of Appendix C, "Private use" === appendix-c4 Character set given in Table C.4 of Appendix C, "Non-character code points" === appendix-c5 Character set given in Table C.5 of Appendix C, "Surrogate codes" === appendix-c6 Character set given in Table C.6 of Appendix C, "Inappropriate for plain text" === appendix-c7 Character set given in Table C.7 of Appendix C, "Inappropriate for canonical representation" === appendix-c8 Character set given in Table C.8 of Appendix C, "Change display properties or are deprecated" === appendix-c9 Character set given in Table C.9 of Appendix C, "Tagging characters" === appendix-c Union of appendix-c1, appendix-c2, appendix-c3, appendix-c4, appendix-c5, appendix-c6, appendix-c7, appendix-c8, and appendix-c9 === Version History * 1.0 Initial Release * 1.1 Actually export appendix-c Description of your changes:

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