immer
Wren
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immer | Wren | |
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25 | 44 | |
2,420 | 6,745 | |
- | 0.8% | |
6.7 | 0.0 | |
2 days ago | 8 months ago | |
C++ | Wren | |
Boost Software License 1.0 | MIT License |
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immer
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Text Editor Data Structures: Rethinking Undo
I've been working on an editor (not text) in C++ and pretty early got into undo/redo. I went down the route of doIt/undoIt for commands but that quickly got old. There was both the extra work needed to implement undo separately for every operation, but also the nagging feeling that the undo operation for some operation wasn't implemented correctly.
In the end, I switched to representing the entire document state using persistent data structures (using the immer library). This vastly simplified things and implementing undo/redo becomes absolutely trivial when using persistent data structures. It's probably not something that is suitable for all domains, but worth checking out.
https://github.com/arximboldi/immer
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Show HN: A hash array-mapped trie implementation in C
How does this compare to https://github.com/arximboldi/immer (other than the C/C++ difference)?
Also, it's my understanding that, in practice, persistent data structures require a garbage collector in order to handle deallocation when used in a general-purpose way. How does your implementation handle that?
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Text Editor Data Structures
You might be interested in ewig and immer by Juan Pedro Bolivar Puente:
https://github.com/arximboldi/ewig
https://github.com/arximboldi/immer
See the author instantly opening a ~1GB text file with async loading, paging through, copying/pasting, and undoing/redoing in their prototype “ewig” text editor about 27 minutes into their talk here:
https://m.youtube.com/watch?v=sPhpelUfu8Q
It’s backed by a “vector of vectors” data structure called a relaxed radix balanced tree:
https://infoscience.epfl.ch/record/169879/files/RMTrees.pdf
That original paper has seen lots of attention and attempts at performance improvements, such as:
https://hypirion.com/musings/thesis
https://github.com/hyPiRion/c-rrb
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value semantics and spans/views
You’re absolutely right, however people have been putting in the “extra efforts” required for efficiency. Check out immer if you’re interested.
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How to synchronize access to application data in multithreaded asio?
The C++ immer library: https://github.com/arximboldi/immer
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Purely Functional Data Structure by Chris Okasaki [pdf]
For C++ check this one out - https://github.com/arximboldi/immer
- Persistent and immutable data structures written in C++14
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Introducing B++ Trees, a C++ B+ Tree library
Yeah I agree that I should link that wikipedia page in the docs, I'll do that as soon as I get a chance. immer (https://github.com/arximboldi/immer) also links that page in its docs, for the exact same reason I'm sure. Interestingly, there is a lot of overlap between persistent data structures in the functional programming sense and persistent data structures in the persisted-to-disk sense because persistent data structures in the FP sense are one of the best ways to guarantee atomic updates and safe failure recovery in a persisted-to-disk system! Btrfs and ZFS, as well as many databases, are at their core basically just copy-on-write B+ trees.
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What are some architectural patterns for creating a game editor.
I’ve never tried it, but I love the idea of implementing editor scene state using immutable data structures like https://github.com/arximboldi/immer With that, every edit would append a new node to a list of scene states. Undo/redo becomes iterating your view of the scene up and down through that list. Can’t screw up an undo function if there’s never any work to do :P
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TypeScript Without Side Effects
I have! I think it's related to the C++ immer library which I used several years ago in Vortex. It's kinda like the previous generation of ValueScript. 🍻
Wren
- Tinyssh
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Show HN: Wren – simple yet super extensible task management system
For a moment I thought it was about wren programming language... [1]
[1] https://wren.io/
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Attempting each AOC in a language starting with each letter of the alphabet
For "W" you could use Wren.
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loxcraft: a compiler, language server, and online playground for the Lox programming language
Bob Nystrom also has a blog, and his articles are really well written (see his post on Pratt parsers / garbage collectors). I'd also recommend going through the source code for Wren, it shares a lot of code with Lox. Despite the deceptive simplicity of the implementation, it (like Lox) is incredibly fast - it's a great way to learn how to build production grade compilers in general.
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Bevy 0.10: data oriented game engine built in Rust
Only kind of unrelated ... Every time I see the Bevy logo I'm reminded of Wren language https://wren.io/
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Are they all like this?
If you want a pure C99 (sadly not C89 like Lua) immensely fast embeddable language pure interpreter, wren is a great language with excellent features like overload by arity. There is a huge maturity gap between the languages tho.
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Most important language features not touched in the book "Crafting Interpreters"?
Check out the source to Wren: https://wren.io. It’s from the author of Crafting Interpreters and builds directly on what’s discussed in the book (essentially a more complete Lox) and adds several additional types, including an array.
- Why does Rust have parameters on impl?
- Liberating the Smalltalk lurking in C and Unix
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What are some good C programs I can read through?
The best C code I have ever read is that of wren.
What are some alternatives?
babashka - Native, fast starting Clojure interpreter for scripting
Lua - Lua is a powerful, efficient, lightweight, embeddable scripting language. It supports procedural programming, object-oriented programming, functional programming, data-driven programming, and data description.
clj-kondo - Static analyzer and linter for Clojure code that sparks joy
LuaJIT - Mirror of the LuaJIT git repository
graalvm-clojure - This project contains a set of "hello world" projects to verify which Clojure libraries do actually compile and produce native images under GraalVM.
ChaiScript - Embedded Scripting Language Designed for C++
ewig - The eternal text editor — Didactic Ersatz Emacs to show immutable data-structures and the single-atom architecture
V8 - The official mirror of the V8 Git repository
deprecated-coalton-prototype - Coalton is (supposed to be) a dialect of ML embedded in Common Lisp.
Duktape - Duktape - embeddable Javascript engine with a focus on portability and compact footprint
awesome-modern-cpp - A collection of resources on modern C++
ChakraCore - ChakraCore is an open source Javascript engine with a C API. [Moved to: https://github.com/chakra-core/ChakraCore]