flexbugs
z3
flexbugs | z3 | |
---|---|---|
9 | 28 | |
13,647 | 9,754 | |
- | 1.1% | |
0.0 | 9.8 | |
4 months ago | 4 days ago | |
C++ | ||
MIT License | GNU General Public License v3.0 or later |
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flexbugs
- Flexbugs
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Use any web browser as GUI, with Zig in the back end and HTML5 in the front end
For old features yes, for new ones it depends.
https://github.com/philipwalton/flexbugs
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I am not that excited about new CSS features
First, we read all the articles that showed us how to use it. Then we need to understand the axes. After that, we needed to wait for browser support. In the meantime, some of us brave enough used float fallbacks. On top of all that, we needed to deal with bugs. Those were the happy times, but they got us to this point in the frontend development phase.
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What are some cross-browser quirks to watch out for nowadays?
To actually contribute, there's some flexbox bugs here which are still valid. https://github.com/philipwalton/flexbugs
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My Good Friend Flexbox
If you find yourself in a situation when you have to solve a flexbox related layout bug for IE11, you might want to have a look at this collection of known issues and workarounds which helped me a great deal in the past.
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Make formal verification and provably correct software practical and mainstream
For functional stuff, sure, but I don't think this is achievable within the UI domain. CSS rules have implementation details that change how you write it, for example there's a documented set of issues in flex implementations maintained here: https://github.com/philipwalton/flexbugs
It might be practical and possible to become mainstream for some domains, but it's doubtful for others.
- I hit a wall learning CSS Flexbox alignment and justification two weeks ago, so I wrote a web page to try to figure it out. I accidentally documented all the differences between how Chrome and Firefox interpret flexbox alignment and justification. IDK if this is useful or not, but here it is.
- Long live Flexbox
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Debugging CSS: Some Tips and Tricks
For example, I've regularly ran into flexbox issues that are Safari-specific. I've discovered these by testing in other browsers and confirming that the issue only shows up in Safari. A good reference of Flexbox browser-specific bugs is Philip Walton's flexbugs repo.
z3
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Ask HN: What is the current state of "logical" AI?
See https://cacm.acm.org/magazines/2023/6/273222-the-silent-revo... and also modern production rules engines like https://drools.org/
Oddly, back when “expert system shells” were cool people thought 10,000 rules were difficult to handle, now 1,000,000 might not be a problem at all. Back then the RETE algorithm was still under development and people were using linear search and not hash tables to do their lookups.
Also https://github.com/Z3Prover/z3
Note “the semantic web” is both an advance and a retreat in that OWL is a subset of first order logic which is really decidable and sorta kinda fast. It can do a lot but people aren’t really happy with what it can do.
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Lean4 helped Terence Tao discover a small bug in his recent paper
Code correctness is a lost art. I requirement to think in abstractions is what scares a lot of devs to avoid it. The higher abstraction language (formal specs) focus on a dedicated language to describe code, whereas lower abstractions (code contracts) basically replace validation logic with a better model.
C# once had Code Contracts[1]; a simple yet powerful way to make formal specifications. The contracts was checked at compile time using the Z3 SMT solver[2]. It was unfortunately deprecated after a few years[3] and once removed from the .NET Runtime it was declared dead.
The closest thing C# now have is probably Dafny[4] while the C# dev guys still try to figure out how to implement it directly in the language[5].
[1] https://www.microsoft.com/en-us/research/project/code-contra...
[2] https://github.com/Z3Prover/z3
[3] https://github.com/microsoft/CodeContracts
[4] https://github.com/dafny-lang/dafny
[5] https://github.com/dotnet/csharplang/issues/105
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Programming Languages Going Above and Beyond
I believe, Nim also has this functionality, although, it uses the [0]Z3Prover tool with a nim frontend [1]"DrNim" for proving.
[0]https://github.com/Z3Prover/z3
- Modern SAT solvers: fast, neat and underused (2018)
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If You've Got Enough Money, It's All 'Lawful'
Don't get me wrong, there are times when Microsoft got it right the first time that was technically far superior to their competitors. Windows IOCP was theoretically capable of doing C10K as far back in 1994-95 when there wasn't any hardware support yet and UNIX world was bickering over how to do asynchronous I/O. Years later POSIX came up with select which was a shoddy little shit in comparison. Linux caved in finally only as recently as 2019 and implemented io_uring. Microsoft research has contributed some very interesting things to computer science like Z3 SAT solver and in collaboration with INRIA made languages like F* and Low* for formal specification and verification. But all this dwarfs in comparison to all the harm they did.
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Constraint Programming 'linking' variables
Z3 theorem prover SMT solver might help you.
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General mathematical expression analysis system
Other than that, you should look at Z3 which is pretty damn good at these sort of theorems/constraints.
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-🎄- 2022 Day 21 Solutions -🎄-
In the end I used Z3 Julia bindings instead. The hardest part was to get the result back from it, because I kept running into assertion violations from inside Z3
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Question about Predicate Transformer Semantics
I'm trying to learn a little bit about Predicate Transformer Semantics (PTS) as part of a quick exploration of Z3.
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The Little Prover
> And you propose me instead to go and reverse engineer library Js code which I am not that proficient in, and rewrite all code in Java instead?..
Yes, rather than demand others cater to your whims, frankly.
Do you realise how hypocritical it sounds to complain that you are not proficient in Javascript, when others might not be proficient in ?
Go use Z3 if you need a prover in C++ (or Java), its far more robust (provided its the type you're after) than someones 700 LoC JavaScript implementation.
https://github.com/Z3Prover/z3
What are some alternatives?
browser-compat-data - This repository contains compatibility data for Web technologies as displayed on MDN
employee-scheduling-ui - An UI component for Employee Scheduling application.
magmide - A dependently-typed proof language intended to make provably correct bare metal code possible for working software engineers.
advent-of-code - My solutions to http://adventofcode.com/ :)
webui - Use any web browser as GUI, with your preferred language in the backend and HTML5 in the frontend, all in a lightweight portable lib.
advent-of-code-go - All 8 years of adventofcode.com solutions in Go/Golang; 2015 2016 2017 2018 2019 2020 2021 2022
gnoga
dafny - Dafny is a verification-aware programming language
ikos - Static analyzer for C/C++ based on the theory of Abstract Interpretation.
webui-demo - WebUI standalone binary template
androguard - Reverse engineering and pentesting for Android applications