re2c
dayjs
re2c | dayjs | |
---|---|---|
12 | 101 | |
1,026 | 45,835 | |
- | - | |
6.8 | 6.9 | |
18 days ago | 10 days ago | |
C | JavaScript | |
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.
dayjs
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How to parse and format a date in JavaScript
Day.js (45.3k ⭐) — A minimalist library that offers an excellent API without much overhead. It is very similar to Moment.js but much smaller in size. It also supports plugins for additional features.
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Handling dates in JavaScript with Tempo
Day.js is a lightweight alternative to the now deprecated date and time handling library, Moment.js. It is written in JavaScript and uses a similar API to Moment.js. Day.js is sufficient for date operations such as parsing, manipulation, and display. It is designed for use on both the browser and the Node.js runtime.
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JavaScript Compare Dates: From Chaos to Clarity
Day.js is awesome for comparing dates! You just need to make dayjs objects from whatever dates you have. You can use the dayjs() function with different inputs and formats. Here’s an example:
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Mastering Time: State-of-the-Art Date Handling in JavaScript
Similar API to Moment.js: Day.js provides a familiar API, making it easier for developers previously using Moment.js to transition.
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The Day.js Dilemma: How Should We Handle OSS Maintainers Going MIA?
As web developers, we heavily rely OSS packages. One popular example is Day.js, a JS lib for parsing, validating, manipulating, and formatting dates. It's a widely-used alternative to Moment, with over 17mil weekly downloads on npm.
A critical bug was discovered in Day.js (see: https://github.com/iamkun/dayjs/pull/2118) causing incorrect date manipulation (add, subtract) when in UTC TZ. This could have severe implications for any project relying on Day.js for date-related functionality. However, the maintainer of the project appears to be unresponsive, leaving the bug unresolved and the future of the library uncertain.
This raises some important questions for our community:
- At what point should we consider a widely-used OSS project "abandoned" if the maintainer is unresponsive?
- Is forking the project the best solution, or should we first try to reach out to the maintainer through other channels?
- Are there established community guidelines around responsiveness expectations for widely-used OSS projects?
- What are successful examples of community-driven forks or maintenance after a maintainer stepped away?
I am very aware that many of these developers give their spare time for free for these projects, with little or no payment, and I am very thankful for all their work. This developer does get some money (a small amount?) through OpenCollective, and possibly also works for a company (in China?) that makes a UI library, which I think uses Day.js internally.
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JavaScript Libraries That You Should Know
11. DayJs
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Best date library to handle timezones in React Native?
DayJS has issues with its timezone plugin not compatible with Hermes engine https://github.com/iamkun/dayjs/issues/1942
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Everything you need to know about Date in Programming
Date.js
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Complete Tutorial: React Admin Panel with refine and daisyUI
We have to install refine's support packages for React Table and React Hook Form. We are using Tailwind Heroicons for our icons, the Day.js library for time calculations and Recharts library to plot our charts for KPI data. So, run the following and we are good to go:
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Managify: Manage Your Teams Easily
DayJS is a lightweight and fast JavaScript library for manipulating dates and times. It offers a moment.js-like API but with a much smaller footprint.
What are some alternatives?
parser-demo - Good source layout with Flex and Bison
Luxon - ⏱ A library for working with dates and times in JS
date-fns - ⏳ Modern JavaScript date utility library ⌛️
cmark - CommonMark parsing and rendering library and program in C
moment - Parse, validate, manipulate, and display dates in javascript.
lowdown - simple markdown translator
moment-timezone - Timezone support for moment.js
countdown.js - Super simple countdowns.
plex - a parser and lexer generator as a Rust procedural macro
proposal-temporal - Provides standard objects and functions for working with dates and times.