Lark
ruby
Our great sponsors
Lark | ruby | |
---|---|---|
35 | 182 | |
4,471 | 21,516 | |
2.7% | 0.8% | |
7.5 | 10.0 | |
9 days ago | 6 days ago | |
Python | Ruby | |
MIT License | GNU General Public License v3.0 or later |
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.
Lark
-
Show HN: I wrote a RDBMS (SQLite clone) from scratch in pure Python
Lark supports, and recommends, writing and storing the grammar in a .lark file. We have syntax highlighting support in all major IDEs, and even in github itself. For example, here is Lark's built-in grammar for Python: https://github.com/lark-parser/lark/blob/master/lark/grammar...
You can also test grammars "live" in our online IDE: https://www.lark-parser.org/ide/
The rationale is that it's more terse and has less visual clutter than a DSL over Python, which makes it easier to read and write.
-
Oops, I wrote yet another SQLAlchemy alternative (looking for contributors!)
First, let me introduce myself. My name is Erez. You may know some of the Python libraries I wrote in the past: Lark, Preql and Data-diff.
-
Hey guys, have any of you tried creating your own language using Python? I'm interested in giving it a shot and was wondering if anyone has any tips or resources to recommend. Thanks in advance!
It's not super maintained but you might enjoy building something with ppci, Pure Python Compiler Infrastructure. It has some front-ends and some back-ends. There's also PeachPy for an assembler. People like using Lark for parsing, I hear.
-
Is it possible to propagate higher level constructs (+, *) to the generated parse tree in an LR-style parser?
lark, a parsing library where I am somewhat involved has a really nice solution to this: Rules starting with _ are inlined in a post processing step.
-
can you create your own program language in python, if yes how?
Lark is a good library to assist with this.
- Lark a Python lexer/parser library
-
Create your own scripting language in Python with Sly
If I may ask, did you consider Lark, and if so, why wasn't it fit for your purposes?
- Creating a language with Python.
-
Not Your Grandfather’s Perl
A grammar provides the high level constructs you need to define the "shape" of your data, and it largely takes care of the rest. Grammar libraries exist in other language (eg. lark or Parsimonius in Python) and they weren't created just to make XML parsing easier.
-
Earley Parsing Explained
I made a solid attempt at an Earley parser framework of my own, but apparently to get the most reliable performance from Earley parsing you need to implement Joop Leo's improvement for right-recursive grammars, which nobody has been able to adequately explain to me. I've read Kegler's open letter to Vaillant, I've tried to read other implementations, I've even tried to beat my head against the original academic paper, but I don't have the background knowledge to make sense of it all.
ruby
-
🚀Secure Rails Authentication: A Step-by-Step Guide to Sign Up, Log In, and Log Out
To create a new Rails app, you should have Ruby and Rails installed on your machine. You can find how to install Ruby on your local machine using the Ruby docs. You can install Rails by running the following command:
- Ruby – Implement Chilled Strings
- Ruby 3.3
-
Tests Everywhere - Ruby
Ruby testing with RSpec
-
YJIT Is the Most Memory-Efficient Ruby JIT
Not parent poster and do not have production YJIT experience. =)
My guess is that you would monitor `RubyVM::YJIT.runtime_stats[:code_region_size]` and/or `RubyVM::YJIT.runtime_stats[:code_gc_count]` so that you can get a feel for a reasonable value for your application, as well as know whether or not the "code GC" is running frequently.
https://github.com/ruby/ruby/blob/master/doc/yjit/yjit.md#pe...
-
M:N thread scheduler for Ractors has been merged!
Link to the commit
-
GitHub and Developer Ecosystem Control
Part of the major userbase pull in GitHub revolves around hosting a considerable number of popular projects including Angular, React, Kubernetes, cpython, Ruby, tensorflow, and well even the software that powers this site Forem.
-
Undocumented Features of GitHub
Hold option and click on the “collapse file” button in the Files view of a commit or pull request, and it will collapse all the files.
Select text in a comment, issue, or pull request description and press r—the selected text (including markdown formatting) will get pre-populated as a markdown block quote reply in the next comment box.
Add .patch or .diff to any pull request URL if you want to see a plain-text diff of the pull request (e.g. maybe you want to quickly `curl ... | git apply -` an unmerged pull request into a local copy of the repo without trying to add and fetch the git remote that the pull request is from).
There are lots of keyboard shortcuts. For example, / to jump to the file finder.
Not so much a secret but more like a hiding in plain sight: when looking at a commit GitHub will show you the earliest and latest tag (i.e. release) that includes the commit. For example, this commit[1] first appeared in v3_2_0_preview3.
[1]: https://github.com/ruby/ruby/commit/892f350a7db4d2cc99c5061d...
-
Ruby Outperforms C: Breaking the Catch-22
The title is misleading, just like other commenters mentioned. Just check how much indirection "rb_iv_get()" has to make (at the end, it will call [1], which isn't "a light" call). Now, check generated JIT code (in a blog post) for the same action where JIT knows how to shave off unnecessary indirection.
We are comparing apples and oranges here.
[1] https://github.com/ruby/ruby/blob/b635a66e957e4dd3fed83ef1d7...
-
How to Check If a Variable Is Defined with Ruby's Defined? Keyword
I'm not sure why, but all the source values are listed here: https://github.com/ruby/ruby/blob/1cc700907d3ad3368272488a6f...
Maybe someone knowledgeable in the underpinnings of Ruby will explain why "class variable" was not hyphenated.
What are some alternatives?
pyparsing - Python library for creating PEG parsers [Moved to: https://github.com/pyparsing/pyparsing]
CocoaPods - The Cocoa Dependency Manager.
PLY - Python Lex-Yacc
advent-of-code - My solutions for Advent of Code
pydantic - Data validation using Python type hints
SimpleCov - Code coverage for Ruby with a powerful configuration library and automatic merging of coverage across test suites
sqlparse - A non-validating SQL parser module for Python
Ruby on Rails - Ruby on Rails
Atoma - Atom, RSS and JSON feed parser for Python 3
CPython - The Python programming language
Construct - Construct: Declarative data structures for python that allow symmetric parsing and building
yjit - Optimizing JIT compiler built inside CRuby