percival
chumsky
percival | chumsky | |
---|---|---|
12 | 54 | |
589 | 3,392 | |
- | - | |
0.0 | 8.6 | |
over 1 year ago | about 1 month ago | |
Rust | Rust | |
MIT License | MIT License |
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percival
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Learn Datalog Today
Souffle and Cozo mentioned below already implement the whole of "traditional" datalog.
Percival (https://github.com/ekzhang/percival) has some very nice examples showing how you can interactively write and test rules on top of a datalog interpreter.
Bud (http://bloom-lang.net/bud/) is Hellerstein's proof of concept playground. It has bit-rotted in the past few years, but the examples are readable even if you can't easily get it working.
The complexity can be quite good. You can syntactically determine when you've written linear recursion (equivalent to a for loop) vs not. Otherwise, the complexity is what you'd expect from incremental view maintenance in a normal SQL database. Which is to say O(n^k) with k being the number of relations joined, but usually much, much less with appropriate indexes and skew in the data. All the usual tricks concerning data normalization and indexes from databases apply.
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Soufflé: A Datalog Synthesis Tool for Static Analysis
I've worked on percival a bit, it compiles (transpiles?) the datalog ast into javascript code on demand and executes it to get the results, see [1]. Percival's creator, Eric, also submitted a 10m presentation about the project [2] to the HYTRADBOI 'virtual conference' earlier this year [2]. They also submitted a Show HN that received a couple comments [3]. The Have You Tried Rubbing A Database On It conference included several awesome presentations featuring datalog, which readers may find interesting [4].
[1]: https://github.com/ekzhang/percival/blob/main/crates/perciva...
[2]: https://www.hytradboi.com/2022/percival-a-reactive-language-...
[3]: https://news.ycombinator.com/item?id=29521975
[4]: https://www.hytradboi.com/
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Chumsky, a Rust parser-combinator library with error recovery
I haven't written a parser with Chumsky, bit I've played with a little one a bit if you wanna see an example syntax. The error reporting for this project is implemented with `ariadne` which is also really slick.
Parser: https://github.com/ekzhang/percival/blob/main/crates/perciva...
Error reporting: https://github.com/ekzhang/percival/blob/main/crates/perciva...
Datalog playground: https://percival.ink/
To see an error report, delete some punctuation from one of the Datalog code blocks then press shift-return.
- Show HN: Percival – Web-based reactive Datalog notebooks, made with Rust+Svelte
- Percival: Web-based, reactive Datalog notebooks for data analysis and visualization, written in Rust and Svelte
chumsky
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Lezer: A Parsing System for CodeMirror, Inspired by Tree-Sitter
I attempted to use this but was disheartened but the fact that it doesn't statically type node names. Tree Sitter doesn't either but it has much more of an excuse given that it targets C.
https://github.com/lezer-parser/lezer/issues/8
The dev seems mildly hostile to outside involvement too, so I moved on. These days I use Chumsky which is Rust rather than Typescript, but also way more awesome, if you can deal with the often incomprehensible compilation errors at least!
https://github.com/zesterer/chumsky
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nom > regex
there’s also chumsky: https://github.com/zesterer/chumsky
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Writing an Equation Solver
We are using technique called parser combinator. And we are using a library chumsky to write parser combinators.
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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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Examples of function-based parsers in chumsky? Examples of unit tests?
The examples that come with chumsky and the chumsky tutorial and guide all define their parsers using closures.
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Flamingo - A start: the syntax, a soon-to-be-built keyword-less lang with flavoured code blocks. Seeking help and advice please :)
Parser: https://crates.io/crates/chumsky
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pep-508 v0.2.1 - Zero copy Python dependency parser written with chumsky
chumsky's zero-copy rewrite has reached its first alpha release, and I have migrated my pep-508 parser to it, as suggested in my last announcement.
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winnow = toml_edit + combine + nom
On my side, nom is still advancing well and a new major version is in preparation, with some interesting work a new GAT based design inspired from the awesome work on chumsky, that promises to bring great performance with complex error types. 2023 will be fun for parser libraries!
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Rust implementation of Python dependency parser for PEP 508
I am using chumsky because I like the API, but it doesn't support zero copy at the moment. Although efficiency is good to have, it is not my primary good. This will probably get supported once chumsky implements support for it (see upstream issue).
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Question about lexer and parser generators in Rust
Checkout https://github.com/zesterer/chumsky or https://github.com/rust-bakery/nom
What are some alternatives?
codeql - CodeQL: the libraries and queries that power security researchers around the world, as well as code scanning in GitHub Advanced Security
nom - Rust parser combinator framework
crepe - Datalog compiler embedded in Rust as a procedural macro
pest - The Elegant Parser
modus - A language for building Docker/OCI container images
pom - PEG parser combinators using operator overloading without macros.
cclyzerpp - cclyzer++ is a precise and scalable pointer analysis for LLVM code.
lalrpop - LR(1) parser generator for Rust
souffle - Soufflé is a variant of Datalog for tool designers crafting analyses in Horn clauses. Soufflé synthesizes a native parallel C++ program from a logic specification.
instaparse
async-observable - Async & reactive synchronization model to keep multiple async tasks / threads partially synchronized.
combine - A parser combinator library for Rust