<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html; charset=UTF-8" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> On 2/22/2023 12:39 PM, Hilaire Fernandes via Cuis-dev wrote: <blockquote cite="mid:11195bfc-9599-f8cd-2bf0-afa4be2e4bd1@free.fr" type="cite"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> Oops too late I already update the book (html updated, no the pdf build) <a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://cuis-smalltalk.github.io/TheCuisBook/Message-to-string-entities.html#index-Unicode">https://cuis-smalltalk.github.io/TheCuisBook/Message-to-string-entities.html#index-Unicode</a> <a moz-do-not-send="true" class="moz-txt-link-freetext" href="https://cuis-smalltalk.github.io/TheCuisBook/String-_002d_002d-a-particular-collection.html#index-Unicode-2">https://cuis-smalltalk.github.io/TheCuisBook/String-_002d_002d-a-particular-collection.html#index-Unicode-2</a> <div class="moz-cite-prefix">Le 22/02/2023 à 16:00, Hernán Wilkinson via Cuis-dev a écrit : </div> <blockquote type="cite" cite="mid:CAGgF3Gxnj72XQTyqy5NFg3cZHNBS0x6cYRzf0Tj3sqxReJ42Hw@mail.gmail.com"> <div>If my memory does not fail me I remember talking with Juan about this behavior and the reason for copy to return the same object is because UnicodeString are immutable... but let's wait for Juan to confirm that.</div> <div> </div> </blockquote> Yes, I remember that too. <pre class="moz-signature" cols="72">-- GNU Dr. Geo <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://drgeo.eu">http://drgeo.eu</a> <a moz-do-not-send="true" class="moz-txt-link-freetext" href="http://blog.drgeo.eu">http://blog.drgeo.eu</a></pre> </blockquote> Hi Folks, A few clarifications (some / most you all already figured out) - String literals containing only ASCII characters are instances of String - String literals containing any non-ASCII character are instances of UnicodeString - Both are correctly indexed. #at: works as expected. But the same UnicodeString can be encoded in various forms. See #asNFC, #asNFD, UnicodeString>>#=. This is just the way Unicode works. - String and UnicodeString are interchangeable and interoperable. Conversions are done automatically. You don't need to care, except for: - UnicodeString are immutable An important note is that we can make UnicodeString modifiable via #at:put: if we want. In most systems Unicode strings can not be modified. But in Cuis we can compute and store the new 'bytes', nil 'hash' and we are done. On one hand, the system works well with immutable strings. It is not really needed. On the other hand, making them modifiable improves compatibility with older code and tutorials, and other dialects. It is also a good example of Smalltalk "magic". Hilaire, after we make our minds wrt immutable or mutable UnicodeStrings, I'd like to rewrite those sections on the book. In last year's Smalltalks conference at Buenos Aires, I presented a short paper on Unicode in Cuis: <a class="moz-txt-link-freetext" href="https://openreview.net/pdf?id=c93fukpVINA">https://openreview.net/pdf?id=c93fukpVINA</a> . The main point I make is that most programmers usually don't need to know or care about the encoding used for Strings. They should only care about their behavior. So, I'd like to rewrite those parts in the same spirit. Thanks, <pre class="moz-signature" cols="72">-- Juan Vuletich cuis.st github.com/jvuletich researchgate.net/profile/Juan-Vuletich independent.academia.edu/JuanVuletich patents.justia.com/inventor/juan-manuel-vuletich linkedin.com/in/juan-vuletich-75611b3 twitter.com/JuanVuletich '</pre> </body> </html>