December 2015 - Pharo-dev - lists.pharo.org

Re: [Pharo-dev] New web tutorial

by Sven Van Caekenberghe

> On 15 Dec 2015, at 12:04, Stephan Eggermont <stephan(a)stack.nl> wrote: > > On 15-12-15 10:39, Sven Van Caekenberghe wrote: >> Nu we toch Nederlands mogen praten, het lijkt me best om voorbeeld code zo minimaal mogelijk te houden. De paswoord hashing is wel een goed idee. > > Mijn Frans is best aardig, maar dit (pagina 63) begrijp ik niet helemaal: > > "If you run the test, it will fail because the system returns instances of posts instead of 2. Why this is happening? We never told the system that posts are objects that should be saved in the database." AprÃ¨s 63 pages, l'Anglais revient pour un paragraphe ... haha

Dec. 15, 2015

Re: [Pharo-dev] review, validation and test development for GenericGF

by Robert Withers

The review I need is especially the case with the multiply(a, b), in Java, or #multiply:scalar:, in Smalltalk. Thank you! On 12/15/2015 06:30 AM, Robert Withers wrote: > Hi all, sticking with the distribution for discussing Crypto in the > base, I am currently trying to stabilize a port of Reed-Solomon such > that FEC can be added to SecureSession. I am doing this work in > SecureSession. I just posted an update of the GenericGF class, with > the Java implementation attached here. > > I need this critical code reviewed and tested. You need Cryptography > and SecureSession to be included in the catalog. If you can help me > with the former, I could help with the latter, if that suits you. > Please let me know! > > Please load Cryptography(-Pharo) and SecureSession.23 for review. > > "ported & refactored GenericGF from the java code. This includes > reindexing from 0 to 1. Having no tests, hopefully someone can > give a review of this specific class. Where some tests to be > developed at this scope, that would be stellar." > > > I appreciate. > -- > . .. .. ^,^ best, robert -- . .. .. ^,^ best, robert

Dec. 15, 2015

Re: [Pharo-dev] New web tutorial

by phil＠highoctane.be

En franstaligers die nederlands kunnen begrijpen. Schrijven is een andere verhaal :-) Phil On Tue, Dec 15, 2015 at 12:11 PM, Skip Lentz <skip.lentz(a)inria.fr> wrote: > > > On Dec 15, 2015, at 10:39 AM, Sven Van Caekenberghe <sven(a)stfx.eu> > wrote: > > > > > >> On 15 Dec 2015, at 10:34, Stephan Eggermont <stephan(a)stack.nl> wrote: > >> > >> On 15-12-15 10:23, Sven Van Caekenberghe wrote: > >>>> passwordHash > >>>> passwordHash ifNil: [ ^'' ]. > >>>> ^ passwordHash > >>> > >>> That last method is not needed, since 'any string' = nil is false, > right ? > >> > >> Yep. > > > > Nu we toch Nederlands mogen praten, het lijkt me best om voorbeeld code > zo minimaal mogelijk te houden. De paswoord hashing is wel een goed idee. > > Yay Nederlanders :D >

Dec. 15, 2015

review, validation and test development for GenericGF

by Robert Withers

Hi all, sticking with the distribution for discussing Crypto in the base, I am currently trying to stabilize a port of Reed-Solomon such that FEC can be added to SecureSession. I am doing this work in SecureSession. I just posted an update of the GenericGF class, with the Java implementation attached here. I need this critical code reviewed and tested. You need Cryptography and SecureSession to be included in the catalog. If you can help me with the former, I could help with the latter, if that suits you. Please let me know! Please load Cryptography(-Pharo) and SecureSession.23 for review. "ported & refactored GenericGF from the java code. This includes reindexing from 0 to 1. Having no tests, hopefully someone can give a review of this specific class. Where some tests to be developed at this scope, that would be stellar." I appreciate. -- . .. .. ^,^ best, robert

Dec. 15, 2015

Re: [Pharo-dev] Unicode Support - Normalization NFD -- #decomposedStringWithCanonicalMapping

by H. Hirzel

On 12/13/15, stepharo <stepharo(a)free.fr> wrote: > >> It is best and (mostly) correct to think of a Unicode string as a sequence >> of Unicode characters, each defined/identified by a code point (out of >> 10.000s covering all languages). That is what we have today in Pharo (with >> the distinction between ByteString and WideString as mostly invisible >> implementation details). >> >> To encode Unicode for external representation as bytes, we use UTF-8 like >> the rest of the modern world. >> So far, so good. >> ...> > > like me ;) > I will wait for a conclusion with code :) > > Stef > Some code with illustration by the e acute example see below >> Why then is there confusion about the seemingly simple concept of a >> character ? Because Unicode allows different ways to say the same thing. >> The simplest example in a common language is (the French letter Ã©) is >> >> LATIN SMALL LETTER E WITH ACUTE [U+00E9] >> >> which can also be written as >> >> LATIN SMALL LETTER E [U+0065] followed by COMBINING ACUTE ACCENT [U+0301] >> >> The former being a composed normal form, the latter a decomposed normal >> form. (And yes, it is even much more complicated than that, it goes on for >> 1000s of pages). >> >> In the above example, the concept of character/string is indeed fuzzy. >> >> HTH, >> >> Sven The text below shows how to deal with the Unicode e acute example brought up by Sven in terms of comparing strings. Currently Pharo and Cuis do not do Normalization of strings. Limited support is in Squeak. It will be shown how NFD normalization may be implemented. Swift programming language ----------------------------------------- How does the Swift programming language [1] deal with Unicode strings? // "Voulez-vous un cafÃ©?" using LATIN SMALL LETTER E WITH ACUTE let eAcuteQuestion = "Voulez-vous un caf\u{E9}?" // "Voulez-vous un café?" using LATIN SMALL LETTER E and COMBINING ACUTE ACCENT let combinedEAcuteQuestion = "Voulez-vous un caf\u{65}\u{301}?" if eAcuteQuestion == combinedEAcuteQuestion { print("These two strings are considered equal") } // prints "These two strings are considered equal" The equality operator uses the NFD (Normalization Form Decomposed)[2] form for the comparison appyling a method #decomposedStringWithCanonicalMapping[3] Squeak / Pharo ----------------------- Comparison without NFD [3] "Voulez-vous un cafÃ©?" eAcuteQuestion := 'Voulez-vous un caf', 16rE9 asCharacter asString, '?'. combinedEAcuteQuestion := 'Voulez-vous un cafe', 16r301 asCharacter asString, '?'. eAcuteQuestion = combinedEAcuteQuestion false eAcuteQuestion == combinedEAcuteQuestion false The result is false. A Unicode conformant application however should return *true*. Reason for this is that Squeak / Pharo strings are not put into NFD before testing for equality = Squeak Unicode strings may be tested for Unicode conformant equality by converting them to NFD before testing. Squeak using NFD asDecomposedUnicode[4] transforms a string into NFD for cases where a Unicode code point if decomposed, is decomposed only to two code points [5]. This is so because when initializing [6] the Unicode Character Database in Squeak this is a limitation imposed by the code which reads UnicodeData.txt [7][8]. This is not a necessary limitation. The code may be rewritten at the price of a more complex implementation of #asDecomposedUnicode. "Voulez-vous un cafÃ©?" eAcuteQuestion := 'Voulez-vous un caf', 16rE9 asCharacter asString, '?'. combinedEAcuteQuestion := 'Voulez-vous un cafe', 16r301 asCharacter asString, '?'. eAcuteQuestion asDecomposedUnicode = combinedEAcuteQuestion asDecomposedUnicode true Conclusion ------------------ Implementing a method like #decomposedStringWithCanonicalMapping (swift) which puts a string into NFD (Normalization Form D) is an important building block towards better Unicode compliance. A Squeak proposal is given by [4]. It needs to be reviewed.extended. It should probably be extended for cases where there are more than two code points in the decomposed form (3 or more?) The implementing of NFD comparison gives us an equality test for a comparatively small effort for simple cases covering a large number of use cases (Languages using the Latin script). The algorithm is table driven by the UCD [8]. From this follows an simple but important fact for conformant implementations need runtime access to information from the Unicode Character Database [UCD][9]. [1] https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swif… [2] http://www.unicode.org/glossary/#normalization_form_d [3] https://developer.apple.com/library/ios/documentation/Cocoa/Reference/Found… [4] String asDecomposedUnicode http://wiki.squeak.org/squeak/6250 [5] http://www.unicode.org/glossary/#code_point [6] Unicode initialize http://wiki.squeak.org/squeak/6248 [7] http://www.unicode.org/Public/UNIDATA/UnicodeData.txt [8] Unicode Character Database documentation http://unicode.org/reports/tr44/ [9] http://www.unicode.org/reports/tr23/

Dec. 15, 2015

Re: [Pharo-dev] AsmJit

by Robert Withers

On 12/15/2015 06:09 AM, phil(a)highoctane.be wrote: > > Too bad Igor is not floating around anymore... > Indeed, where has the young man gotten off too? His Hydra was my favorite. -- . .. .. ^,^ best, robert

Dec. 15, 2015

Re: [Pharo-dev] New web tutorial

by Skip Lentz

> On Dec 15, 2015, at 10:39 AM, Sven Van Caekenberghe <sven(a)stfx.eu> wrote: > > >> On 15 Dec 2015, at 10:34, Stephan Eggermont <stephan(a)stack.nl> wrote: >> >> On 15-12-15 10:23, Sven Van Caekenberghe wrote: >>>> passwordHash >>>> passwordHash ifNil: [ ^'' ]. >>>> ^ passwordHash >>> >>> That last method is not needed, since 'any string' = nil is false, right ? >> >> Yep. > > Nu we toch Nederlands mogen praten, het lijkt me best om voorbeeld code zo minimaal mogelijk te houden. De paswoord hashing is wel een goed idee. Yay Nederlanders :D

Dec. 15, 2015

Re: [Pharo-dev] AsmJit

by phil＠highoctane.be

I wish it could stay around! But with more targets (arm, x64) that may become harder to maintain. Too bad Igor is not floating around anymore... Phil On Tue, Dec 15, 2015 at 12:06 PM, Jan Vrany <jan.vrany(a)fit.cvut.cz> wrote: > Hi guys, > > two queations: > > (i) Is AsmJit going to be developed any more or it's abandoned > as well as native boost? > > (ii)Where can I find latest AsmJit? I'm properly confused: > > * Is is the one in latest Pharo 4.0 (5.0) image? > * Is it the one here: http://smalltalkhub.com/#!/~Pharo/AsmJit ? > (the one in the image seem to be based on completely disjunct > set of .mcz than those in the repo above). > > Best, Jan > >

Dec. 15, 2015

AsmJit

by Jan Vrany

Hi guys,Â two queations:Â (i) Is AsmJit going to be developed any more or it's abandoned Â Â as well as native boost? (ii)Where can I find latest AsmJit? I'm properly confused: Â Â * Is is the one in latest Pharo 4.0 (5.0) image? Â Â * Is it the one here:Â http://smalltalkhub.com/#!/~Pharo/AsmJitÂ ? Â Â Â (the one in the image seem to be based on completely disjunct Â Â Â Â set of .mcz than those in the repo above). Best, Jan

Dec. 15, 2015

Re: [Pharo-dev] New web tutorial

by Stephan Eggermont

On 15-12-15 10:39, Sven Van Caekenberghe wrote: > Nu we toch Nederlands mogen praten, het lijkt me best om voorbeeld code zo minimaal mogelijk te houden. De paswoord hashing is wel een goed idee. Mijn Frans is best aardig, maar dit (pagina 63) begrijp ik niet helemaal: "If you run the test, it will fail because the system returns instances of posts instead of 2. Why this is happening? We never told the system that posts are objects that should be saved in the database."

Dec. 15, 2015