re2c
croc
re2c | croc | |
---|---|---|
12 | 130 | |
1,026 | 26,374 | |
- | - | |
6.8 | 8.3 | |
19 days ago | 6 days ago | |
C | Go | |
GNU General Public License v3.0 or later | MIT License |
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re2c
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Ask HN: What are some unpopular technologies you wish people knew more about?
(1) Zulip Chat - https://zulip.com/ - seems to be reasonably popular, but more people should know about it
I’ve been using it for over 5 years now [1], and it’s as good as ever. It’s way faster than any other chat app I’ve used. It has a good UI and conversation model. It has a simple and functional API that lets me curl threads and write blog posts based on them.
(only problem is that I Ctrl-+ in my browser to make the font bigger – I think it’s too dense for most people)
(2) re2c regex to state machine compiler - https://re2c.org
A gem from the 90’s, which people have done a great job maintaining and improving (getting Go and Rust target support in the last few years). I started using it in 2016, and used for a new program a few months ago. I came to the conclusion that it should have been built into C, because C has shitty string processing – and Ken Thompson both invented C AND brought regular languages to computing !!
In comparison, treesitter lexers are very low level, fiddly, and error prone. I recently saw dozens of ad hoc fixes to the tree-sitter-bash lexer, which is unsurprising if you look at the structure of the code (manually crawling through backslashes and braces in C).
https://github.com/tree-sitter/tree-sitter-bash/blob/master/...
These fixes are definitely appreciated, but I think it indicates a problem with the model itself.
(based on https://lobste.rs/s/endspx/software_you_are_thankful_for#c_y...)
[1] https://www.oilshell.org/blog/2018/04/26.html
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Irregular Expressions
The "Papers" section on re2c's web site continues Laurikari's work: http://re2c.org/
... but I haven't found them particularly accessible. And it's not clear it's a viable strategy in a general purpose regex engine. Namely, I'm not sure how much bigger it makes the DFA.
Also, AFAIK, these are DFAs. They are different theoretical structures with explicitly more power.
> and then an NDFA is used to match a third time, to extract the capture groups.
That's the PikeVM. It's an NFA simulation. Although it uses additional storage and is otherwise more computationally powerful than just a plain NFA.
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My experience crafting an interpreter with Rust (2021)
> What do you gain by using it?
Performance, although this possibly depends on your compiler, whether you use PGO, and similar finicky issues.
Example: https://eli.thegreenplace.net/2012/07/12/computed-goto-for-e...
Some prior HN discussion: https://news.ycombinator.com/item?id=18678920
Another example where goto is relevant is implementing finite automata. A (very short) paper from 1988 that discusses three different ways of implementing a finite state machine is "How (Not) to Code a Finite State Machine". The documentation of RE2C may be even more interesting: https://re2c.org
RE2C is a program that compiles finite automata into C, Go, or Rust code. It provides many implementation strategies: it can make use of computed or labelled gotos when the language provides them.
Implementing pushdown automata comes with similar issues.
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How to compile DPDK-22.11.1
wget https://github.com/skvadrik/re2c/releases/download/1.0.3/re2c-1.0.3.tar.gz tar -zxvf re2c-1.0.3.tar.gz cd re2c-1.0.3/ ./configure make make install
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Best approach for writing a lexer
In Rust I use https://docs.rs/logos/latest/logos/. I think another similar is http://re2c.org
- re2c is a free and open-source lexer generator for C/C++, Go and Rust
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File parsing with PHP, Bison and re2c
re2c is an open-source lexer generator. It uses regular expressions to recognize tokens.
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Best option for Rust Parser and Lexer Generators?
Those suggested crates are still more or less the popular options. There was also recently added support for Rust in re2c.
- How Does One Develop the Grammar for their New Language
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Javascript Date String Parsing
First, the implementation of strtotime is a textbook study in why other people's C code is not where you want to spend time. You can see the guts of the implementation logic here. This isn't stock C code -- it's code for a system called re2c. This system allows you to write regular expressions in a custom DSL (domain specific language), and then transform/compile those regular expressions down to C programs (also C++ and Go) that will execute those regular expressions. Something in PHP's make file uses this parse_date.re file to generate parse_date.c. If you don't realize parse_date.c is a generated file, this can be extremely rough going. If you've not familiar with re2c is can be regular rough going. We leave further exploration as an exercise for the reader -- an exercise we haven't taken ourself.
croc
- Show HN: I built a website to share files and messages without any server
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LocalSend: Open-source, cross-platform file sharing to nearby devices
This very hn entries is bust contradicting your statement.
Also what about syncthing[1] (for recurrent/permanent sync) and croc[2] (for one time copies) ?
I have used both for a number of years already.
[1] https://syncthing.net/
[2] https://github.com/schollz/croc
- How to copy a file between devices?
- Better way to transfer files between Windows <> Mac?
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Ask HN: What are some unpopular technologies you wish people knew more about?
Check out croc, I've been using it for years, and it works pretty great too!
https://github.com/schollz/croc
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CLI to browser P2P fileshare
I'm trying to find very specific software.I need CLI(!!!) tool like Croc to share files using P2P, but it's very inconvenient to ask people to install same software as me(Croc in this case). Instead i want to get direct download URL, so anyone can download it just by using browser.
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Localsend: Open-Source Airdrop Alternative
Related projects:
- FlyingCarpet: direct transfer over local adhoc WIFI: https://github.com/spieglt/FlyingCarpet
- LANDrop: Drop any files to any devices on your LAN: https://github.com/LANDrop/LANDrop
- In-browser file transfer similar to Airdrop: https://snapdrop.net/
- Magic Wormhole: simple file transfer from computer-to-computer over the net: https://github.com/magic-wormhole/magic-wormhole
- Croc: similar to magic wormhole: https://github.com/schollz/croc
- Wormhole: user-friendly in-browser based e2e encrypted file transfer: https://wormhole.app/
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Show HN: Aft, minimalistic file transferring program
There’s already the excellent [croc](https://github.com/schollz/croc) which I’ve gotten all my friends to install and use.
- FLaNK Stack for 25 September 2023
- Croc: Easily and securely send things from one computer to another
What are some alternatives?
parser-demo - Good source layout with Flex and Bison
magic-wormhole - get things from one computer to another, safely
Luxon - ⏱ A library for working with dates and times in JS
syncthing - Open Source Continuous File Synchronization
cmark - CommonMark parsing and rendering library and program in C
wormhole-gui - Cross-platform application for easy encrypted file, folder, and text sharing between devices. [Moved to: https://github.com/Jacalz/rymdport]
lowdown - simple markdown translator
sharedrop - Easy P2P file transfer powered by WebRTC - inspired by Apple AirDrop
moment - Parse, validate, manipulate, and display dates in javascript.
snapdrop - A Progressive Web App for local file sharing
plex - a parser and lexer generator as a Rust procedural macro
termux-app - Termux - a terminal emulator application for Android OS extendible by variety of packages.