alive2 VS Cassius

Compare alive2 vs Cassius and see what are their differences.

Cassius

A CSS specification and reasoning engine (by uwplse)
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alive2 Cassius
4 5
667 90
4.3% -
9.3 0.0
11 days ago about 1 year ago
C++ Racket
MIT License MIT License
The number of mentions indicates the total number of mentions that we've tracked plus the number of user suggested alternatives.
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.

alive2

Posts with mentions or reviews of alive2. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-05-15.

Cassius

Posts with mentions or reviews of Cassius. We have used some of these posts to build our list of alternatives and similar projects. The last one was on 2023-09-12.
  • The Rules of Margin Collapse
    2 projects | news.ycombinator.com | 12 Sep 2023
    FWIW, while there are unfortunately only very few attempts at formalizing CSS, there's at least an unofficial, unreviewed (?), partial formal semantics for (CSS 2-era) float layout based on z3 SMT and Racket you can take a look at to get a flavor, though it isn't receiving further development.

    [1]: https://github.com/uwplse/cassius

    [2]: https://pavpanchekha.com/blog/css-floats.html

  • W3C’s transfer from MIT to non-profit going poorly
    6 projects | /r/programming | 19 Dec 2022
    Do we need W3C anymore? The HTML 5 specification has been created by WHATWG for many years now, with W3C only rubber-stamping historic WHATWG versions until 2017 or so. SVG2 is going nowhere, and so isn't MathML, leaving the CSS working group as W3C's remaining point of influence over the Web. CSS is regarded as so poor and overdone a specification that the only two external projects for a formal specification have failed or remained woefully incomplete (1, 2).
  • Is There Too Much CSS Now?
    4 projects | news.ycombinator.com | 7 Nov 2022
    1. CSS should've been split into app-y styles and doc-y styles a looong time ago; meaning that when you need JavaScript to make use of a feature anyway, there's no point in using CSS and it's better to set styles, layout using JavaScript rather than bloat CSS. The Houdini API was on the right track years ago.

    2. The CSS WG at W3C must deliver formal specification rather than the prose they're writing up now. For an idea how a (partial) formal spec for CSS rendering looks like, see eg. [1], [2] (with limitations).

    The one way complexity that both W3C and WHATWG have delivered over the past 15 years with complete lack of mental discipline due to financial dependency/job security will be a major source of confusion for generations to cone, and will not be looked at favorably.

    [1]: https://github.com/uwplse/cassius

    [2]: https://github.com/lmeyerov/sc

  • Verifying GCC optimizations using an SMT solver
    2 projects | news.ycombinator.com | 4 Nov 2022
    There's this cool project using z3 (and racket) for formalizing CSS rendering [1] I never came around to lift for anything. Maybe someone else interested in leading the web out of the dark ages and give W3C's CSS WG an idea what we expect from them will.

    [1]: https://github.com/uwplse/cassius

  • Ladybird: A new cross-platform browser project
    19 projects | news.ycombinator.com | 12 Sep 2022
    FWIW, I know two (partial, kinda) formal specifications of CSS normal flow and float layout, both of which are finished ie dead projects:

    [1]: https://lmeyerov.github.io/projects/pbrowser/pubfiles/paper....

    [2]: https://github.com/uwplse/cassius

    (not counting the 1990s constraint CSS effort).

    The first was merely part of a parallel compiler project and also covers table layout, whereas the second is a Racket (Scheme) program to formulate the HTML doc and CSS rules as a theory for submitting to z3 SMT to solve all kinds of decision problems (it can also produce a rendering).

    Not sure that's very helpful; it would be cool if W3C can invest some time into better specs (not just prose).

What are some alternatives?

When comparing alive2 and Cassius you can also consider the following projects:

CrossHair - An analysis tool for Python that blurs the line between testing and type systems.

Radpath - Path library for Elixir inspired by Python's pathlib

klee - KLEE Symbolic Execution Engine

ex_guard - ExGuard is a mix command to handle events on file system modifications

zz - πŸΊπŸ™ ZetZ a zymbolic verifier and tranzpiler to bare metal C

recreational-rosette - Some fun examples of solving problems with symbolic execution

Symbolica - Symbolica's open-source symbolic execution engine. [Moved to: https://github.com/Symbolica/Symbolica]

sizeable - An Elixir library to make File Sizes human-readable

llvm-tutor - A collection of out-of-tree LLVM passes for teaching and learning

servo-embedding-example - Examples of embedding Servo inside non-browser GL applications.

taxoptimizer

sprdpl - Simple Python Recursive-Descent Parsing Library