aho-corasick
modern-unix
aho-corasick | modern-unix | |
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21 | 55 | |
950 | 29,788 | |
- | - | |
7.2 | 0.0 | |
about 1 month ago | 2 months ago | |
Rust | ||
The Unlicense | - |
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aho-corasick
- Aho-Corasick Algorithm
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Identifying Rust's collect:<Vec<_>>() memory leak footgun
You can't build the contiguous variant directly from a sequence of patterns. You need some kind of intermediate data structure to incrementally build a trie in memory. The contiguous NFA needs to know the complete picture of each state in order to compress it into memory. It makes decisions like, "if the number of transitions of this state is less than N, then use this representation" or "use the most significant N bits of the state pointer to indicate its representation." It is difficult to do this in an online fashion, and likely impossible to do without some sort of compromise. For example, you don't know how many transitions each state has until you've completed construction of the trie. But how do you build the trie if the state representation needs to know the number of transitions?
Note that the conversion from a non-contiguous NFA to a contiguous NFA is, relatively speaking, pretty cheap. The only real reason to not use a contiguous NFA is that it can't represent as many patterns as a non-contiguous NFA. (Because of the compression tricks it uses.)
The interesting bits start here: https://github.com/BurntSushi/aho-corasick/blob/f227162f7c56...
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Ask HN: What's the fastest programming language with a large standard library?
Right. I pointed it out because it isn't just about having portable SIMD that makes SIMD optimizations possible. Therefore, the lack of one in Rust doesn't have much explanatory power for why Rust's standard library doesn't contain SIMD. (It does have some.) It's good enough for things like memchr (well, kinda, NEON doesn't have `movemask`[1,2]), but not for things like Teddy that do multi-substring search. When you do want to write SIMD across platforms, it's not too hard to define your own bespoke portable API[3].
I'm basically just pointing out that a portable API is somewhat oversold, because it's not uncommon to need to abandon it, especially for string related ops that make creative use of ISA extensions. And additionally, that Rust unfortunately has other reasons for why std doesn't make as much use of SIMD as it probably should (the core/alloc/std split).
[1]: https://github.com/BurntSushi/memchr/blob/c6b885b870b6f1b9bf...
[2]: https://github.com/BurntSushi/memchr/blob/c6b885b870b6f1b9bf...
[3]: https://github.com/BurntSushi/aho-corasick/blob/f227162f7c56...
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Ripgrep is faster than {grep, ag, Git grep, ucg, pt, sift}
Oh I see. Yes, that's what is commonly used in academic publications. But I've yet to see it used in the wild.
I mentioned exactly that paper (I believe) in my write-up on Teddy: https://github.com/BurntSushi/aho-corasick/tree/master/src/p...
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how to get the index of substring in source string, support unicode in rust.
The byte offset (or equivalently in this case, the UTF-8 code unit offset) is almost certainly what you want. See: https://github.com/BurntSushi/aho-corasick/issues/72
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Aho Corasick Algorithm For Efficient String Matching (Python & Golang Code Examples)
This is an implementation of the algorithm in Rust as well if someone is curious. Though this code is written for production and not teaching.
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When counting lines in Ruby randomly failed our deployments
A similar fix for the aho-corasick Rust crate was made in response
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Aho-corasick (and the regex crate) now uses SIMD on aarch64
Teddy is a SIMD accelerated multiple substring matching algorithm. There's a nice description of Teddy here: https://github.com/BurntSushi/aho-corasick/tree/f9d633f970bb...
It's used in the aho-corasick and regex crates. It now supports SIMD acceleration on aarch64 (including Apple's M1 and M2). There are some nice benchmarks included in the PR demonstrating 2-10x speedups for some searches!
- Stringzilla: Fastest string sort, search, split, and shuffle using SIMD
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ripgrep is faster than {grep, ag, git grep, ucg, pt, sift}
Even putting aside all of that, it might be really hard to add some of the improvements ripgrep has to their engine. The single substring search is probably the lowest hanging fruit, because you can probably isolate that code path pretty well. The multi-substring search is next, but the algorithm is very complicated and not formally described anywhere. The best description of it, Teddy, is probably my own. (I did not invent it.)
modern-unix
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Ask HN: Which tools are worth the time?
- Learning "modern" tools like ripgrep and fzf (There's a list here: https://github.com/ibraheemdev/modern-unix)
- Modern-Unix: collection of modern/faster/saner options to common Unix commands
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Koji projekat na Githubu vas je odusevio u zadnje vreme?
Nedavno mi je dobro dosla ova kolekcija toolova za unix https://github.com/ibraheemdev/modern-unix
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My 2023 Terminal, Shell and Command-Line Toolbox
A lot of the tools in the post build on top of standard unix tools and are like for like (better) replacements. Many of them have been pulled from the Modern Unix repo on Github.
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TIL you can do `cat -n file` to easily see line numbers when looking at a file
Plug to modern unix, a collection of utilities that modernize "standard" nix utilities (combination of faster, prettier, easier to use, as well as sensible defaults like highlighting and line numbers when not piped).
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What are some things you can do in the terminal for entertainment?
I google something like "Modern Unix", open blogs, and try to find a "life-changing" tool that I haven't tried yet. Then I spend 1 day reading man how to apply this unreal tool to my current work environment setup. Ultimately, I'm sad because I wasted 1 day, but the process is fun enough to do it again tomorrow. This is like distro-hopping but tool-hopping. Now I have fzf, bat, helix, zoxide etc, but that's just the beginning of my tool-hopping :)
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erdtree: A modern, multi-threaded, and ️🌈aesthetic️🌈 alternative to tree and du - v1.7.0 release ️
While this is not at all comprehensive of all the cool tools out there, there's this list which has a lot of modern alternatives to all of the modern Unix commands we know and love, most of which are written in Rust.
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Introducing rewriteit.net - A collection of software rewritten in Rust
You might want to take some inspiration from https://github.com/ibraheemdev/modern-unix too! Neat website
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LeanCreator - a lean, cross-platform, single file IDE for C/C++
Yeah, fine, since Go and Rust it is common to have this "one file app" that you put in $PATH and call it a day. Now, how many of those are not a single CLI utility (e.g. a replacement for top/ls/du or other UNIX utility), and are full blown GUI app? Not so many. None that I can think of from the top of my head, actually.
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https://asciinema.org/a/e2E1x0QilIvOgSy2N4dKSWwJ8
The UDM Pro looks nicer with modern Unix tools! Commit adding the tools (leveraging UniFi OS Utilities): GitHub commit adding the tools.
What are some alternatives?
uwu - fastest text uwuifier in the west
mcfly - Fly through your shell history. Great Scott!
ripgrep - ripgrep recursively searches directories for a regex pattern while respecting your gitignore
gdu - Fast disk usage analyzer with console interface written in Go
perf-book - The Rust Performance Book
bat - A cat(1) clone with wings.
fzf - :cherry_blossom: A command-line fuzzy finder
awesome-alternatives-in-rust - A curated list of replacements for existing software written in Rust
nnn - n³ The unorthodox terminal file manager
fd - A simple, fast and user-friendly alternative to 'find'
coreutils - Cross-platform Rust rewrite of the GNU coreutils