December 2023 - Linux-il - huji-cs listserver

Online presentation, Making compilers with recursive-descent parse, 1/3/2024
by Steve Litt 31 Dec '23

31 Dec '23

Hi all, GoLUG meeting with compiler construction presentation this coming Wednesday: ====================================================================== What: Online presentation, Making compilers with recursive-descent parse Who: Hendrik Boom When: Wednesday 1/3/2024 at 7PM Eastern Standard Time Where: Jitsi online presentation, https://meet.jit.si/golug [1] ====================================================================== At last month's GoLUG meeting we discussed Flex/Bison compiler construction. Trouble is, debugging Flex/Bison can be difficult. So at GoLUG's January 3, 2024 online meeting, Hendrik Boom shows us how to make a recursive-descent parser to create a compiler or converter for a given language. Hendrik has made several recursive-descent parser solutions, and says it's quite easy to hand-code a recursive-descent parser. Wednesday night he'll show us how to do it for ourselves. I'm really looking forward to this, and hope to see you there. SteveT ==== [1] Online via Jitsi: https://meet.jit.si/golug Mobile app: https://jitsi.org/downloads/ Desktop app: https://github.com/jitsi/jitsi-meet-electron/releases -- Steve Litt GoLUG Publicity Coordinator Originally founded in Orlando, Florida, United States, GoLUG now welcomes an international audience for online presentations and discussions on Linux and adjacent technologies. http://golug.org

1 0

HP OfficeJet Pro 8023
by Shlomo Solomon 27 Dec '23

27 Dec '23

My existing HP printer (8610) died after 8 years - does not recognize the Magenta ink. I'm looking at the HP OfficeJet Pro 8023 2 questions: 1 - Has anyone had good (or bad) experience with this on Linux? I know that HP supports this printer on Linux, but I'm looking for first hand experience. 2 - Any comments about the availability of compatible ink? I found ink on several sites, but from experience, know that HP printers are sometimes fussy about non-original ink. -- Shlomo Solomon http://the-solomons.net Claws Mail 3.17.5 - KDE Plasma 5.18.5 - Kubuntu 20.04

7 14

Re: RMS
by borissh1983＠gmail.com 13 Dec '23

13 Dec '23

In the view of Lifnei iver, Recently RMS had shared an alleged PFLP affiliated organization calls to prevent arms deals to Israel, PFLP participated in the Simhat torah massacre. https://www.stallman.org/archives/2023-sep-dec.html#9_December_2023_(Legal_… The organisation had excused the perpetrators of the Simhat Torah massacre. https://www.alhaq.org/advocacy/21800.html . For my understanding RMS is actively assisting to the other side during the war against Israel. People should do with that information what they like. > On Wed, May 18, 2022, 15:31 <borissh1983(a)gmail.com> wrote: > > > Hi Julian. > > > > On Wednesday, 18 May 2022 17:43:47 IDT Julian Daich wrote: > > > Hi, > > >RMS is coming to Tel Aviv. I am receving him. He is looking for a place to > > >give a prentation in a mayor university on Msy 31 st or June 1st. Is > > there > > >here somebody from TAU or HUJI that can help to organize it? He will no > > >chsrge for his talk. > > > > Given RMS's actions in recent years, I would have checked with someone > > who is familiar with the local law, if having direct connection, or > > assisting RMS is not a liability or against the law. > > > > IANAL. > > > > > > > > _______________________________________________ > > Linux-il mailing list > > Linux-il(a)cs.huji.ac.il > > http://mailman.cs.huji.ac.il/mailman/listinfo/linux-il > > >

3 3

Reminder: GoLUG compiler theory presentations Wednesday, 12/6/2023
by Steve Litt 05 Dec '23

05 Dec '23

Hi all, This email is both a reminder of the meeting's who, what, where and when, and a progress report on my presentation and David's. First the meeting details: ====================================================================== What: Online presentation, Computer language and compiler construction Who: GoLUG's Steve Litt and David Billsbrough When: Wednesday 12/6/2023 at 7PM Eastern Standard Time NOTE: We will start PROMPTLY at 7:00PM EXACTLY! Where: Jitsi online presentation, https://meet.jit.si/golug [1] ====================================================================== David and I have both made astonishing progress. David's ready to give you the nuts and bolts understandings about the compiler creation process, including Parse Trees and other stuff way above my pay grade. As for my presentation on Backus-Naur Format (BNF) and Flex/Bison compilers and converters, over a week ago I realized that online docs for Flex and Bison were usually contradictory, incomplete and/or ambiguous. They were all written by very smart people who forgot what it was like to know nothing, not even the key understandings necessary for newbies. The "Flex & Bison" book I ordered has not arrived, but judging from the first four chapters, which are are available online, this book is too ambiguous for a newbie and it doesn't give enough emphasis to the fact that, for a real compiler, converter or Domain Specific Language (DSL), Flex and Bison are a package deal, and that Bison-only and Lex-only examples are so contrived and misleading as to be learning disadvantages. ChatGPT is somewhat helpful, but can take you down dead end rabbit holes because it frames its guesses as facts, and even responds to the same question differently depending on which websites it scrapes first. I found ChatGPT to be a great resource for hearing relevant terminology, which I can then look up with web searches or queries on mailing lists. Speaking of mailing lists, they're great, but only when you know what question you want to ask and how to frame the question, and until you have several key understandings and know a little vocabulary, you just can't gain the benefits of mailing lists. At the meeting I'll showcase a Lex/Bison "Hello World" (proof of concept) that actually serves as a first step to learning how to build compilers, converters and DSLs. This Hello World can be used to incrementally learn and build more complex compilers, converters and DSLs. Also, while you see and listen to my presentation, you'll acquire the key understandings necessary to learn in a straightforward manner, without gratuitous dead ends and inability to frame a question. While you see and listen to my presentation, you'll also understand using BNF to define a grammar. A grammar is a set of rules determining valid syntax. This is a good thing because when David gives his presentation, you'll need these key understandings to benefit from his nuts and bolts description of compiler construction. If you've wondered how people build new computer languages, compilers, interpreters, markup languages with converters, or even Domain Specific Languages (DSLs), this introductory presentation will de-mystify the topic. I think David's and my presentations will be valued and remembered fondly by anyone who has ever been curious about how computer languages and compilers are made. I hope to see you there. ==== [1] Online via Jitsi: https://meet.jit.si/golug Mobile app: https://jitsi.org/downloads/ Desktop app: https://github.com/jitsi/jitsi-meet-electron/releases -- Steve Litt GoLUG Publicity Coordinator Originally founded in Orlando, Florida, United States, GoLUG now welcomes an international audience for online presentations and discussions on Linux and adjacent technologies. http://golug.org

1 0

Computer language and compiler construction presentation, 12/6/2023, 7PM Eastern Standard Time
by Steve Litt 01 Dec '23

01 Dec '23

Hi all, GoLUG meeting with compiler construction presentation this coming Wednesday: ====================================================================== What: Online presentation, Computer language and compiler construction Who: GoLUG's Steve Litt and David Billsbrough When: Wednesday 12/6/2023 at 7PM Eastern Standard Time Where: Jitsi online presentation, https://meet.jit.si/golug [1] ====================================================================== If you've wondered how people build new computer languages, compilers, interpreters, markup languages with converters, or even Domain Specific Languages (DSLs), this introductory presentation will de-mystify the topic. I (Steve Litt), will start off by showcasing the basics of Backus-Naur Format (BNF), a notation format that aids greatly in compiler and sophisticated markup converter program. Next, I'll briefly go over the scanner>parser compiler/converter methodology, Using Flex (Fast Lexx) for the scanner and Bison (yacc superset) for the parser. The scanner reads the source code or markup, converting it to tokens and strings for the parser. The parser reads the source and outputs the converts the tokens and strings into a program (if compiler) or a different kind of markup (if a converter). NOTE: The preceding is a slight oversimplification because Flex and Bison actually create C code that compiles into the scanner and parser, but from a conceptual standpoint my preceding description is good enough. I'll then show you a trivial Flex/Bison converter that takes a text file whose paragraphs are separated by one or more blank lines, and turns the file into HTML. This would have been much easier to do with a 20 line Python program, but it's a very simple way to demonstrate the Bison/Flex scanner/parser method, and when things get complicated, trying to do the compiler or converter with Python becomes a real mess. I know, I've tried three times to write a Python converter program as a straightforward Python program, while attempting to make my Stylz authoring language. I tried it 3 times, and could never even complete a subset of Stylz conversion.. My part of the presentation takes about an hour and I'll start right at 7PM. Next comes David Billsbrough, who is working to create a compiler for a Pascal subset. He'll also discuss not only Flex>Bison, but doing it straight from Python or C or whatever, thus showcasing the real theory behind compilation. David's presentation shows some heavy theory and non-trivial constructions. I'm sure you'll have plenty of questions for David. If you ever wondered how people make computer languages and then compilers, interpreters or converters for that language, this presentation will shed plenty of light on the subject. And if you're already a compiler making ninja, I think you'll enjoy David's part of the presentation. A good time will be had by all. ==== [1] Online via Jitsi: https://meet.jit.si/golug Mobile app: https://jitsi.org/downloads/ Desktop app: https://github.com/jitsi/jitsi-meet-electron/releases -- Steve Litt GoLUG Publicity Coordinator Originally founded in Orlando, Florida, United States, GoLUG now welcomes an international audience for online presentations and discussions on Linux and adjacent technologies. http://golug.org

1 0

2024

2023

Linux-il December 2023 ----- 2024 ----- November 2024 October 2024 September 2024 August 2024 July 2024 June 2024 May 2024 April 2024 March 2024 February 2024 January 2024 ----- 2023 ----- December 2023 November 2023 October 2023

Linux-il December 2023