From 1183ac475b29301e91b9b025428a71a153913bf8 Mon Sep 17 00:00:00 2001 From: Bradlee Speice Date: Sun, 10 Nov 2024 16:35:28 -0500 Subject: [PATCH] Revert --- _drafts/typed-stack.md | 33 --------------------------------- 1 file changed, 33 deletions(-) delete mode 100644 _drafts/typed-stack.md diff --git a/_drafts/typed-stack.md b/_drafts/typed-stack.md deleted file mode 100644 index 26de035..0000000 --- a/_drafts/typed-stack.md +++ /dev/null @@ -1,33 +0,0 @@ ---- -layout: post -title: "Representing Hierarchies - The Reference Stack Pattern" -description: "" -category: -tags: [rust] ---- - -Of late, I've been working to add support for Rust to the [Kaitai Struct](https://kaitai.io/) project. The idea is to describe data formats -using a YAML schema, and then generate all the code needed for parsing them. Kind of like if you replaced packages like `nom` with a YAML -document instead of macros in code. - -While the project specifics aren't incredibly important, it did force me to take a look at how hierarchies are represented -in Rust, something that [many people](https://hackernoon.com/why-im-dropping-rust-fd1c32986c88#37ee) struggle with. The basic -problem formulation is simple: - -- A root/parent object owns some number of child objects -- Each child needs access to all its parents to do some work - -The specifics are what make this a bit complicated: - -- Each node in this tree can be of a different (though sometimes predictable) type -- If possible, we'd like to avoid `Rc` (performance, `no_std`, pick a reason) - -This hierarchical or "DOM-like" structure shows up in two places that I'm familiar with, but is generic enough to be used in a broad range -of applications. The first example is parser generators (like Kaitai); as an example, describing the [Websocket](https://datatracker.ietf.org/doc/rfc6455/) -[format](https://github.com/kaitai-io/kaitai_struct_formats/blob/861b2fd048252a8092b8d04c2e9f91d0be3671a9/network/websocket.ksy) -requires that every dataframe after the initial know the message type of the first (be it text or binary). The second example is in GUIs, -where you typically describe an application as a collection of widgets. - -We'll develop a toy DOM-like example as motivation, and look at how it can be extended to accommodate more specific situations as necessary. - -