re2c
Luxon
re2c | Luxon | |
---|---|---|
12 | 32 | |
1,026 | 14,906 | |
- | 0.8% | |
6.8 | 7.6 | |
19 days ago | about 1 month ago | |
C | JavaScript | |
GNU General Public License v3.0 or later | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
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
-
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
-
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.
-
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.
-
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
-
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
-
File parsing with PHP, Bison and re2c
re2c is an open-source lexer generator. It uses regular expressions to recognize tokens.
-
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
-
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.
Luxon
-
How to parse and format a date in JavaScript
Luxon (14.7k ⭐) — A library that leverages JavaScript’s Intl for speed and slimness while providing what Intl doesn’t: an immutable user-friendly API. It also supports time zones and localization.
-
Handling dates in JavaScript with Tempo
Luxon is another date and time library written in JavaScript. Luxon works on both browsers and Node.js. The author of Luxon, Isaac Cambrion, was also a contributor to Moment.js before it became deprecated. Now, the team behind Moment.js recommends Luxon, calling it “an evolution of Moment.js.” Luxon’s documentation can even be found in GitHub pages for Moment.js.
-
A bug which is only a bug five days out of the year
To be honest, use a library where someone else figured out the ambiguities and accounted for the edge cases. Good starting point: https://moment.github.io/luxon/#/math
Date-fns is fine for simpler use cases but Luxon is a lot more complete, especially where it comes to time zones.
-
Top 10 react packages for SaaS platforms
8. Luxon: Mastering Time and Timezones for Precision Data Handling
-
What library do you use to handle dates?
In past i used Moment, but I read that we should avoid to use it for future projects. I read someone suggested to use Datejs, but it doesn't seems to be updated, last time was 8 years ago. Currently I'm thinking to use Luxon but I someone suggest Date-fns also.
-
Googling be like
Pain
-
Thoughts on the new Temporal Date API in Javascript??
I haven't seen this before, but I currently use Luxon most of the time and it makes working with dates and times a lot less painful.
-
23 of the best Eleventy Themes (Starters) for 2023
Eleventyone’s project scaffold includes: Eleventy with a skeleton site, a date format filter for Nunjucks based on Luxon, a tiny CSS pipeline with PostCSS, an equally tiny inline JS pipeline, JS search index generator, Netlify Dev for testing Netlify redirects, and a serverless (FaaS) development pipeline with Netlify Dev and Netlify Functions.
-
Effortlessly handle dates and times in JavaScript with Luxon
Luxon is a powerful and lightweight JavaScript library for working with dates and times. It was created as an alternative to the popular Moment.js library, with the goal of being faster, smaller, and easier to use.
-
Luxon Timezones and JS-Date interop
If you ever wondered how luxon and native JS-Dates (with TimeZones) behave when converting them between each other and ISO-Date-Strings here are my tests:
What are some alternatives?
parser-demo - Good source layout with Flex and Bison
dayjs - ⏰ Day.js 2kB immutable date-time library alternative to Moment.js with the same modern API
cmark - CommonMark parsing and rendering library and program in C
date-fns - ⏳ Modern JavaScript date utility library ⌛️
lowdown - simple markdown translator
moment - Parse, validate, manipulate, and display dates in javascript.
moment-timezone - Timezone support for moment.js
plex - a parser and lexer generator as a Rust procedural macro
js-joda - :clock2: Immutable date and time library for javascript
dperf - dperf is a 100Gbps network load tester.
countdown.js - Super simple countdowns.