re2c
greenclip
re2c | greenclip | |
---|---|---|
12 | 10 | |
1,026 | 1,251 | |
- | - | |
6.8 | 2.3 | |
19 days ago | 7 months ago | |
C | Haskell | |
GNU General Public License v3.0 or later | BSD 3-clause "New" or "Revised" License |
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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.
greenclip
- Ask HN: What are some unpopular technologies you wish people knew more about?
- clipboard
- Suggest a clipboard manager please?
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Multi-clipboard app that works with i3wm?
greenclip/rofi-greenclip. It's minimal and, as you can guess from the name, it uses rofi to list/search your clipboard history
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Webdev LPT: Use Windows+V on your keyboard to enable multiple copy-paste items
On i3/AwesomeWM/XFCE, I really enjoyed green-clip integration for rofi. Rofi doesn't play well with Wayland though, and I haven't looked to see if there's anything similar for Albert.
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Darling – run Mac apps on Linux
Rofi can actually be used with a clipboard manager! https://github.com/erebe/greenclip
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clipboard manager with image support
greenclip dude no kidding there is nothing better. https://github.com/erebe/greenclip it uses rofi, which is a tool you should be using regardless. Happy hacking
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Clipboard manager/module for polybar?
While it's not directly related to polybar, do you happen to also use rofi? If so, I recommend checking out greenclip
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Help with xbps-src template
version=3.3 create_wrksrc=yes distfiles="https://github.com/erebe/greenclip/releases/download/$version/greenclip" checksum=
What are some alternatives?
parser-demo - Good source layout with Flex and Bison
dino - Modern XMPP ("Jabber") Chat Client using GTK+/Vala
Luxon - ⏱ A library for working with dates and times in JS
gnome-clipboard-history - Gnome Clipboard History is a clipboard manager Gnome extension that saves what you've copied into an easily accessible, searchable history panel.
cmark - CommonMark parsing and rendering library and program in C
ClipIt - ClipIt clipboard manager for GTK+
lowdown - simple markdown translator
ec2-macos-init - EC2 macOS Init is the launch daemon used to initialize Mac instances within EC2.
moment - Parse, validate, manipulate, and display dates in javascript.
Awesome-Linux-Software - 🐧 A list of awesome Linux softwares
plex - a parser and lexer generator as a Rust procedural macro
Introducing .NET Multi-platform App UI (MAUI) - .NET MAUI is the .NET Multi-platform App UI, a framework for building native device applications spanning mobile, tablet, and desktop.