immer
Wren
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immer | Wren | |
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25 | 44 | |
2,411 | 6,726 | |
- | 1.1% | |
6.7 | 0.0 | |
2 days ago | 7 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.
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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:
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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
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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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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. 🍻
- immer: Postmodern immutable and persistent data structures for C++
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The Jank Language: LLVM Hosted Clojure
jank is currently using immer for persistent data structures: https://github.com/arximboldi/immer
Very much inspired by Clojure, with a lot of time put into benchmarking and profiling.
It's too early for me to share numbers on jank vs Clojure itself, especially due to the rewrite, but my earlier jank versions were definitely competitive with AOT compiled Clojure jars.
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Image undo/redo implementation
An alternate method: use an immutable vector from immer to store the pixels. This works like git. Instead of modifying the image in place, immer will give you a new vector with the changes made. The immutable vector is implemented to make this efficient.
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.
This is very nice! Well done! Can you open an issue on the wren lang repository and mention this? https://github.com/wren-lang/wren Wren is also written by Bob Nystrom and the implementations share a lot of things.
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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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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?
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.
LuaJIT - Mirror of the LuaJIT git repository
ChaiScript - Embedded Scripting Language Designed for C++
V8 - The official mirror of the V8 Git repository
Duktape - Duktape - embeddable Javascript engine with a focus on portability and compact footprint
ChakraCore - ChakraCore is an open source Javascript engine with a C API. [Moved to: https://github.com/chakra-core/ChakraCore]
sol2 - Sol3 (sol2 v3.0) - a C++ <-> Lua API wrapper with advanced features and top notch performance - is here, and it's great! Documentation:
q3vm - Q3VM - Single file (vm.c) bytecode virtual machine/interpreter for C-language input
dart-embedding-example - [Deprecated] An example of embedding Dart in an existing C++ application
Nim - Nim is a statically typed compiled systems programming language. It combines successful concepts from mature languages like Python, Ada and Modula. Its design focuses on efficiency, expressiveness, and elegance (in that order of priority).
V7 - Embedded JavaScript engine for C/C++
libffi - A portable foreign-function interface library.