re2c
ultimatepp
re2c | ultimatepp | |
---|---|---|
12 | 21 | |
1,026 | 738 | |
- | 2.6% | |
6.8 | 9.5 | |
19 days ago | 9 days ago | |
C | C++ | |
GNU General Public License v3.0 or later | BSD 2-clause "Simplified" 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.
ultimatepp
- Ask HN: What are some unpopular technologies you wish people knew more about?
-
Hey guys, just wanted to share some exciting news with you all. U++ 2022.3 has recently been released and there's one big change that everyone should know about. So, what's the big change you ask? Well, you'll have to download the latest version to find out! Happy coding!
For more information, you can also visit our official site: https://www.ultimatepp.org/.
-
MacOS IDE multiplatform
Have you considered Ultimate++?
-
[Cpp] Une assez grande liste de bibliothèques graphiques C ++
U++
-
U++ 2022.3 has been release with one major change
You can also visit our official site for more information.
-
-🎄- 2022 Day 24 Solutions -🎄-
U++ (C++ framework)
-
C++ Projects with GUI
The true thing is that you may find U++ framework very interesting. We created our framework to be extremely easy to use by beginners. We prepared various tutorials that will teach you how to create powerful UI applications with our technology.
-
Tic tac toe ine c++ ?
Some say qt, others wxwidgets, u++, sfml, here is a video from quick search on wxwidgets and c++ for beginners https://www.youtube.com/watch?v=FOIbK4bJKS8 Choosethem depending on learning curve and where they will take you, you might learn something harder because it takes you farther to where you want to go.
-
-🎄- 2022 Day 10 Solutions -🎄-
U++ (C++ GUI/RAD framework) day 10 solution at github
-
-🎄- 2022 Day 9 Solutions -🎄-
U++ (C++ framework): https://github.com/ped7g/adventofcode/blob/main/2022-upp/09_rope_bridge/09_rope_bridge.cpp
What are some alternatives?
parser-demo - Good source layout with Flex and Bison
VulkanSceneGraph - Vulkan & C++17 based Scene Graph Project
Luxon - ⏱ A library for working with dates and times in JS
filesystem - An implementation of C++17 std::filesystem for C++11 /C++14/C++17/C++20 on Windows, macOS, Linux and FreeBSD.
cmark - CommonMark parsing and rendering library and program in C
mindforger - Thinking notebook and Markdown editor with LLM wingman.
lowdown - simple markdown translator
Elements C++ GUI library - Elements C++ GUI library
moment - Parse, validate, manipulate, and display dates in javascript.
fyne - Cross platform GUI toolkit in Go inspired by Material Design
plex - a parser and lexer generator as a Rust procedural macro
OctaneGUI - OctaneGUI is a renderer agnostic multi-window multi-platform UI library for C++.