egglog | lalrpop | |
---|---|---|
4 | 25 | |
337 | 2,883 | |
3.3% | 1.2% | |
9.5 | 7.5 | |
9 days ago | 17 days ago | |
Rust | Rust | |
MIT License | Apache-2.0 or MIT |
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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.
egglog
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Towards a New SymPy
The herbie project using egraphs to explore different ways of rewriting floating point expressions. https://herbie.uwplse.org/ One can also write custom rulesets in egglog (a new egraph rewriting system / language / datalog) https://egraphs-good.github.io/egglog/?example=herbie
The approach is not yet anywhere near being able to touch all the domains sympy can handle. Destructive term rewriting tends to be a bit more forgiving to unsoundness in the rules and still returning roughly meaningful results. EGraph rewriting (and other automated reasoning systems) tend to just return junk as soon as you aren't careful about your semantics. Associativity and commutativity are ubiquitous in CAS applications and encoding these concepts in general purpose terms is rather unsatisfying. The post above emphasizes specialty methods for polynomials, which it would be desirable to find a clean way to integrate into egraph techniques. Variable binding (which is treated in a rather mangled form in CAS systems) is seemingly important for treating summation, differentiation, and integration correctly. The status of doing variable binding efficiently and correctly in egraphs is also unclear imo.
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What is the state of the art for creating domain-specific languages (DSLs) with Rust?
For semantic analyzers, check out egg and egglog. They're custom data structures for representing compiler rewrite rules in a non-destructive way.
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Ask HN: What is new in Algorithms / Data Structures these days?
The recent work on relational, datalog-inspired egraphs in PLDI this year ("Unifying Datalog and Equality Saturation") is actually interesting because it can solve cases like the y/x*x -> y identity example, by the power of an interval analysis on x (among other things.) Sort of like adding a postulate but instead it's by adding relations between terms in the graph.
https://github.com/egraphs-good/egglog
https://arxiv.org/pdf/2304.04332.pdf
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Better Together: Unifying Datalog and Equality Saturation
Close, but the link is on Page 13, and it points here: https://github.com/mwillsey/egg-smol
Unfortunately the naming is all a bit confusing, isn't it....
lalrpop
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nom > regex
And some related parser tools: - https://github.com/kevinmehall/rust-peg - https://github.com/pest-parser/pest - https://github.com/lalrpop/lalrpop
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What is the state of the art for creating domain-specific languages (DSLs) with Rust?
lalrpop
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Letlang — Roadblocks and how to overcome them - My programming language targeting Rust
Rust is a very nice langage for implementing compilers, and has a nice ecosystem for it (logos, rust-peg, lalrpop, astmaker -- this one is mine --, etc...).
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loxcraft: a compiler, language server, and online playground for the Lox programming language
rust-langdev has a lot of libraries for building compilers in Rust. Perhaps you could use these to make your implementation easier, and revisit it later if you want to build things from scratch. I'd suggest logos for lexing, LALRPOP / chumsky for parsing, and rust-gc for garbage collection.
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Question about lexer and parser generators in Rust
Hi! For one of my projects I am currently using lalrpop (https://github.com/lalrpop/lalrpop/tree/master/doc/calculator/src), which is far from complete, but has the basic syntax I was looking for. I took some examples and worked around some lexer stuff but I’m currently happy with it. If you use it and have Intellij stuff installed, you can also use a plug-in for highlighting and SOMETIMES error checking. Otherwise, even VSCode had a great plug-in for highlighting!
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Contrext-free language parsing with procedural macros
How would you compare and contrast this with, say, lalrpop?
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Tools for creating a programming language in rust
lalrpop is great. It's a completely different approach from nom, but for parsing a programming language, I would at least consider it. RustPython uses it.
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Best languages to design a new language in?
I presume LALRPOP handles left recursion just fine.
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Show HN: IQ” – jq for images (using rust, LALRPOP)
I wanted to share an experimental side project I have been working on for some time. I constantly use commands like `jq` and `yq` for processing structured data in my day job and I was curious if a similar idea could be applied to images.
Another goal of mine was to get some exposure to with rust. I discovered the LALRPOP parser generator which really helped moved the project along (https://github.com/lalrpop/lalrpop)
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Writing a new programming language. Part II: Variables and expressions
The key point here is that we are going to depend on the lalrpop library to generate the parser based on the formal grammar we define. Note that we have it as part of the [build-dependencies] section and we only depend on a tiny utility crate called lalrpop-util at runtime. The reason for that is the main lalrpop "magic" would happen during the crate compilation (in the build.rs file) when lalrpop would generate the deterministic pushdown automaton based on our grammar. The code generation logic is not required to be part of our interpreter, we only need a few utility methods from the lalrpop-util for the automaton to operate. You might have noticed that we also enable the lexer feature of lalrpop, because we are going to use lexer provided by lalrpop as well (please refer to the Part I if you do not know what the lexer is).
What are some alternatives?
ezno - A JavaScript compiler and TypeScript checker written in Rust with a focus on static analysis and runtime performance
pest - The Elegant Parser
libclc - Cache Line Container - C11
nom - Rust parser combinator framework
scryer-prolog - A modern Prolog implementation written mostly in Rust.
rust-peg - Parsing Expression Grammar (PEG) parser generator for Rust
flix - The Flix Programming Language
combine - A parser combinator library for Rust
yjs - Shared data types for building collaborative software
PEGTL - Parsing Expression Grammar Template Library
mpack - MPack - A C encoder/decoder for the MessagePack serialization format / msgpack.org[C]
chomp - A fast monadic-style parser combinator designed to work on stable Rust.