WebAssembly Lua

WebAssembly for Lua Code editor website: https://zeyu-li.github.io/Lua-Online/

Forked from https://github.com/vvanders/wasm_lua -> https://github.com/Dreagonmon/wasm_lua

To remake do:

make all

To clean of all intermediate and final files use:

make clean

Features

alert("Hello World!") 	-- works in creating an alert event in the browser
io.read() 				-- reads from browser with an alert popup (very buggy)

Infinite loops do not work because of js event loop

Demo

Files

• index.html: test page and usage example
• main.js: auto-generated js
• main.wasm: auto-generated binary

Webassembly

This is where you generate the webassemby binary and main.js if you decide to modify the lua code or update the webassembly in main.c and demolib.c

• main.c: export lua C function to javascript
• demolib.c: helper to main that enables alerts on the browser via alert("Something") when written in the textbox
• makefile: emcc config (which function to export, init function name, ...etc.)
• lua-5.40: lua source code without any modify except to the makefile

* Technically, lua-5.4.0 and c files not needed to run file as the main.wasm is the byte code understood by the browser

Dependencies

• Lua source (built from source)
• emscripten (https://emscripten.org/docs/getting_started/downloads.html)
• CodeMirror for online editor https://codemirror.net/

Why Lua?

• Lua is a fast, highly embeddable VM that boasts a wide set of features allowing it to be adapted to a diverse set of domains and platforms.
• Can be run in 400kb of memory or less
• Multi-paradigm via metatables, closures and coroutines
• Robust, proven VM that's shipped on platforms including MIPS, x86, ARM and many others(and now WASM!)
• Small, easy to understand language
• Extensible debugger hooks for easy on-target debugging