re2c
NoiseTorch
re2c | NoiseTorch | |
---|---|---|
12 | 106 | |
1,026 | 8,988 | |
- | 1.0% | |
6.8 | 5.1 | |
18 days ago | 15 days ago | |
C | Go | |
GNU General Public License v3.0 or later | GNU General Public License v3.0 or later |
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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.
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.
NoiseTorch
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Ask HN: What are some unpopular technologies you wish people knew more about?
Noisetorch. https://github.com/noisetorch/NoiseTorch
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Real-Time Noise Suppression for PipeWire writen in Rust
Interesting! How does it compare with NoiseTorch/RNNoise?
Interesting! I'm currently using NoiseTorch-ng. Although NoiseTorch works well, I don't like that you need to reload NoiseTorch every time you change a setting.
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Easy Effects: Audio effects for PipeWire applications
I till now haven't figured out how to setup noise reduction in PipeWire. In Pulse, it was very easy. At the present, I'm using https://github.com/noisetorch/NoiseTorch.
(I do like PipeWire)
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Audio crackling woes on Pop_OS 22.04
You could always try NoiseTorch. https://github.com/noisetorch/NoiseTorch
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Steam Deck's fan noises interfere with a built in mic
Maybe it will be possible to integrate this or something like this to SteamOS, given it's using PipeWire: https://github.com/noisetorch/NoiseTorch
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Mic problems in game (Apex legends)
If Apex allows you to select a mic, you can make a virtual (filtered) one with noisetorch.
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FOSS open source version of adobe enhance - Enhance voice recordings
Don't know if you are looking for the same - NoiseTorch - Works like a charm.
- Noise cancellation for linux
- AI Audio Upscaling?
What are some alternatives?
parser-demo - Good source layout with Flex and Bison
easyeffects - Limiter, compressor, convolver, equalizer and auto volume and many other plugins for PipeWire applications
Luxon - ⏱ A library for working with dates and times in JS
cadmus - A GUI frontend for @werman's Pulse Audio real-time noise suppression plugin
cmark - CommonMark parsing and rendering library and program in C
noise-suppression-for-voice - Noise suppression plugin based on Xiph's RNNoise
lowdown - simple markdown translator
rnnoise - Recurrent neural network for audio noise reduction
moment - Parse, validate, manipulate, and display dates in javascript.
PercepNet - Unofficial implementation of PercepNet: A Perceptually-Motivated Approach for Low-Complexity, Real-Time Enhancement of Fullband Speech
plex - a parser and lexer generator as a Rust procedural macro
mute-me - App is replaced by the new version which called Mutify