treeyah/Action

Action Language

   ___   ___   ___   ___   ___   ___
  / _ \ / _ \ / _ \ / _ \ / _ \ / _ \
 | A | | C | | T | | I | | O | | N |
  \___/ \___/ \___/ \___/ \___/ \___/

Action is a simple programming language written in C++ for learning and experimentation. You can run it in the terminal, or in your browser via the Web REPL.

---

Run in the terminal

There is no build system — compile the single source file directly:

g++ -o action Action.cpp
./action

Type commands at the prompt, then run() to execute (see Commands).

---

Run in the browser (Web REPL)

The interpreter is compiled to WebAssembly and driven from a small static site in web/. It opens on a menu where you can start a new program, browse the commands reference, or continue a saved program (saved in your browser).

# 1. Build the WASM (requires Emscripten; once per change to Action.cpp)
source ~/emsdk/emsdk_env.sh
bash build-web.sh                       # -> web/action.js + web/action.wasm

# 2. Serve it (WASM must be served over HTTP, not file://)
python3 -m http.server 8000 --directory web

Then open http://localhost:8000. See web/README.md for details.

---

Features

• Print text
• Basic math operations
• Variables
• Repeat commands
• Program execution system

---

Syntax

Output

write(text) newline()

Output stays on the same line; use newline() to move to the next line.

Math

add(a+b) minus(a-b) times(a*b) divide(a/b)

Variables

set(name=value) get(name) input()

input() reads a value while the program runs and stores it as input (read it back with get(input)). In the terminal you type it after run(); on the website you type your answer right in the output.

Repeat

repeat(n)

---

Commands

• run() → Execute program
• list() → Show stored code
• clear() → Clear program
• exit() → Quit interpreter

---

Example

write(Hello) newline() set(user=Ben) get(user)