immer
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immer | factor | |
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25 | 59 | |
2,420 | 1,580 | |
- | 0.8% | |
6.7 | 9.8 | |
2 days ago | 8 days ago | |
C++ | Factor | |
Boost Software License 1.0 | BSD 2-clause "Simplified" 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. 🍻
factor
- An Exploration of SBCL Internals (2020)
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My history with Forth, and stack machines
My impression so far is (in general), Forth are practically limited to doing embedded/microcontroller development.
For us, web/mobile/desktop app devs, beside:
- 8th (https://8th-dev.com)
- Factor (https://factorcode.org)
Any suggestion which implementation we should look for?
- Forth: The programming language that writes itself: The Web Page
- Retro: A Modern, Pragmatic Forth
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Pharo 11, the pure object-oriented language and environment is released!
Factor is also very much worth a look. Forth-style syntax, but with many of the ideas from CL and Smalltalk as well. In fact as a CL fan, I was very impressed by it. It's also quite "batteries included" a la Python.
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The toki pona of programming.
Otherwise, and more seriously, I'm not completely sure variables are needed. Factor is quite usable (it's my favorite go-to language if I quickly need to script something), and mostly doesn't have them.
- Forth as an intermediate language
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A Dynamic Forth Compiler for WebAssembly
There's a note on the page from 2022-08-19, that a lot has been added to it. It also links to the github page[1] for the up-to-date changes.
I am a Lisp, April, APL/J/BQE, and Forth[2] aficionado. I did some file munging programs in Factor back in 2012 at my job to sort through theater attendance logs in Word to compile statistics.
[1] https://github.com/remko/waforth
[2] https://factorcode.org/
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What the hell is Forth? (2019)
Is there any "battery-included" ANS Forth (more or less like Python/Go) which provides access to concurrency, networking, database, GUI, etc?
Not an embedded device programmer, but mostly deals with frontend apps, and occasionally backend, so those are very relevant to me.
Or perhaps use "non-traditional" Forths like 8th (https://8th-dev.com) or Factor (https://factorcode.org)?
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-🎄- 2022 Day 2 Solutions -🎄-
Here's my day two solution using Factor
What are some alternatives?
babashka - Native, fast starting Clojure interpreter for scripting
jonesforth - Mirror of JONESFORTH
clj-kondo - Static analyzer and linter for Clojure code that sparks joy
durexforth - Modern C64 Forth
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.
bondi - source code for the bondi programming language
ewig - The eternal text editor — Didactic Ersatz Emacs to show immutable data-structures and the single-atom architecture
Raylib-CsLo - autogen bindings to Raylib 4.x and convenience wrappers on top. Requires use of `unsafe`
deprecated-coalton-prototype - Coalton is (supposed to be) a dialect of ML embedded in Common Lisp.
oil - Oils is our upgrade path from bash to a better language and runtime. It's also for Python and JavaScript users who avoid shell!
awesome-modern-cpp - A collection of resources on modern C++
batteries-included - Batteries Included project