redgrep
fst
| redgrep | fst | |
|---|---|---|
| 4 | 11 | |
| 150 | 1,714 | |
| 0.7% | - | |
| 5.8 | 3.5 | |
| 2 months ago | 4 months ago | |
| C++ | Rust | |
| Apache License 2.0 | The Unlicense |
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redgrep
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Show HN: Regex Derivatives (Brzozowski Derivatives)
I don't think Rust regex engine relies on this technique. I guess the main point is when you construct the DFA directly you still have the possibility of the exponential explosion of the number of states. That's why modern engines balance between NFA/DFA and lazy DFA.
Though there is an implementation that relies only on Brzozowski derivatives: https://github.com/google/redgrep
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Introducing: Pomsky (formerly Rulex)
redgrep did it though: https://github.com/google/redgrep
- Redgrep – grep based on regex derivatives, matches in linear time
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Speed of Rust vs. C
It couldn't figure it out from looking through ripgrep's website: does ripgrep support intersection and complement of expressions? Like eg https://github.com/google/redgrep does.
Regular languages are closed under those operations after all.
fst
- fst: Represent large sets and maps compactly with finite state transducers
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Creating a perfect HashMap from string keys known in advance
I'd point you towards BurntSushi's fst crate: https://github.com/BurntSushi/fst
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How to use mmap safely in Rust?
The fst crate effectively relies on mmap for it to work right. The folks here suggesting you just use the heap might be right, but only if using the heap is actually plausible. If your dictionary is GBs big (an FST might be bigger than available memory), then copying it the heap first would be disastrous.
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Official /r/rust "Who's Hiring" thread for job-seekers and job-offerers [Rust 1.64]
You'll love what we're working on if you're interested in the implementation of:- Tantivy- Meilisearch- Finite State Transducers
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rustc is unacceptably slow compiling long lists of constant slices
Here's an example of longest prefix matching using a FST which I based my approach on: https://github.com/BurntSushi/fst/pull/104/files
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Official /r/rust "Who's Hiring" thread for job-seekers and job-offerers [Rust 1.63]
Finite State Transducers
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Wikit Desktop - A dictionary application using tauri GUI framework
As a result, I have a plan to implement a desktop version from then and I finished today with a beta version. The desktop is based on tauri, and the dictionary index algorithm is FST (it is an awesome index algorithm).
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WordBueno.com online dictionary. Fast, no frills, mobile friendly.
WordBueno’s data is currently derived from Wiktionary. The backend is using Rust’s warp with fst for indexing.
- Show HN: WordBueno: sleek dictionary built with Rust and Svelte
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Speed of Rust vs. C
No you don't. I've written multiple programs that load things instantly off the file system via memory maps. See the fst crate[1], for example, which is designed to work with memory maps.
Rust "works badly with memory mapped files" doesn't mean, "Rust can't use memory mapped files." It means, "it is difficult to reconcile Rust's safety story with memory maps." ripgrep for example uses memory maps because they are faster sometimes, and its safety contract[2] is a bit strained. But it works.
[1] - https://github.com/BurntSushi/fst/
[2] - https://docs.rs/grep-searcher/0.1.7/grep_searcher/struct.Mma...
What are some alternatives?
ixy-languages - A high-speed network driver written in C, Rust, C++, Go, C#, Java, OCaml, Haskell, Swift, Javascript, and Python
smartstring - Compact inlined strings for Rust.
libskry_r - Lucky imaging library
rust-fnv - Fowler–Noll–Vo hash function
barre - A Regular Expression Library and CFG parser for Rust using Brzozski Derivatives
itoa - Fast function for printing integer primitives to a decimal string
ixy - A simple yet fast user space network driver for Intel 10 Gbit/s NICs written from scratch
tao - The TAO of cross-platform windowing. A library in Rust built for Tauri.
linkify-it - Links recognition library with full unicode support
warp - A super-easy, composable, web server framework for warp speeds.