re2c
StackStorm
re2c | StackStorm | |
---|---|---|
12 | 25 | |
1,026 | 5,921 | |
- | 0.6% | |
6.8 | 9.5 | |
19 days ago | 4 days ago | |
C | Python | |
GNU General Public License v3.0 or later | Apache License 2.0 |
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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.
StackStorm
- Ask HN: What are some unpopular technologies you wish people knew more about?
- StackStorm – IFTTT for Ops
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Small app using a DB?
Stackstorm
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We built Activepieces to replace Zapier + learnings from last post
What differentiates this from things like n8n, node red, and stackstorm? (which sort of occupy a zapier replacement, IoT automation, and infra automation niche, respectively)
- SRE: What tool do you use for Incident Response Runbook/Playbook
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IT Capstone Project Ideas
Network Automation is interesting topic, something like event driven automation would be cool. StackStorm is what comes to mind for a tool/resource.
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Hacker News top posts: Nov 24, 2022
StackStorm: Event-driven automation\ (17 comments)
- StackStorm (a.k.a. “IFTTT for Ops”) is event-driven automation
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What Open Source Projects Do You Use In Your District?
StackStorm -- "IFTTT For Ops" I am investigating the different integrations to see if it can help automate some things.
What are some alternatives?
parser-demo - Good source layout with Flex and Bison
Rundeck - Enable Self-Service Operations: Give specific users access to your existing tools, services, and scripts
Luxon - ⏱ A library for working with dates and times in JS
n8n - Free and source-available fair-code licensed workflow automation tool. Easily automate tasks across different services.
cmark - CommonMark parsing and rendering library and program in C
argo - Workflow Engine for Kubernetes
lowdown - simple markdown translator
Node RED - Low-code programming for event-driven applications
moment - Parse, validate, manipulate, and display dates in javascript.
Huginn - Create agents that monitor and act on your behalf. Your agents are standing by!
plex - a parser and lexer generator as a Rust procedural macro
SaltStack - Software to automate the management and configuration of any infrastructure or application at scale. Get access to the Salt software package repository here: