web-sw-cor24-apl

Browser-based APL environment running the sw-cor24-apl interpreter on an emulated COR24 CPU via WebAssembly.

Live demo: https://sw-embed.github.io/web-sw-cor24-apl/

Part of the Software Wrighter COR24 Tools Project.

Features

• REPL panel -- printer-style terminal with 6-space APL indent, scrolling output, and keyboard input
• APL glyph prettification -- three display modes: representation (rho), shorthand (APL glyphs), and literate (shape-of / reshape)
• Hardware panel -- emulated COR24 S2 switch and D2 LED with quad-variable access (qled, qsw)
• Demo programs -- dropdown with pre-built examples (scalars, vectors, matrices, hardware I/O, shared variables, etc.)
• File upload -- load .apl source files from disk
• Reset -- clear workspace and restart the interpreter
• Fully client-side -- no server required; works offline once loaded

APL Syntax

COR24 APL uses ASCII surface syntax with lowercase reserved words and uppercase user identifiers:

      iota 5
0 1 2 3 4
      A <- 2 3 rho iota 6
      A
0 1 2
3 4 5
      rho A
2 3
      +/ iota 10
45

Keywords: rho, iota, take, drop, qled, qsw, qsvo

Build

Requires Trunk and a Rust toolchain with wasm32-unknown-unknown.

trunk build                # dev build to dist/
./scripts/serve.sh         # dev server on port 9957
./scripts/build-pages.sh   # release build to pages/ for GitHub Pages

Technology

Component	Choice
Language	Rust (edition 2024)
UI framework	Yew 0.21 (CSR)
Build tool	Trunk
WASM bindings	wasm-bindgen + web-sys
Theme	Catppuccin Mocha
Emulator	cor24-emulator (path dependency)
APL interpreter	sw-cor24-apl (C -> COR24 asm, embedded at build time)

Project Structure

src/
  lib.rs          App component, module declarations
  main.rs         Entry point (Yew renderer)
  repl.rs         REPL component (input/output, APL evaluation)
  control_bar.rs  Control bar (demo dropdown, file upload, reset)
  hardware.rs     Hardware panel (S2 switch, D2 LED)
  prettify.rs     APL glyph prettification engine
  demos.rs        Demo program registry
build.rs          Pre-assembles APL interpreter at build time
index.html        Trunk entry point with Catppuccin Mocha theme
scripts/
  serve.sh        Development server
  build-pages.sh  GitHub Pages release build
pages/            GitHub Pages deployment output
docs/             Design documents (architecture, PRD, plan)

Links

• Blog: Software Wrighter Lab
• Discord: Join the community
• YouTube: Software Wrighter

Copyright

Copyright (c) 2026 Michael A. Wright

License

MIT