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Kalos: The tiny embeddable scripting system

CI Build Language grade: C/C++

Kalos is a very lightweight, easy-to-integrate scripting system for applications wanting to add easy runtime configuration and automation.

Kalos is heavily inspired by Python, though offering a more C-like syntax.

Kalos runs on everything from Arduinos to low-memory 8086 DOS all the way up to 64-bit machines!

import app;
import color;
import window;

on app.init {
    var x;
    app.fill(0, 0, window.WIDTH, window.HEIGHT, color.BLUE);
    # Draw lines every four pixels
    for x in range(0, window.WIDTH / 4) {
        app.drawline(x * 4, 0, x * 4, window.HEIGHT, color.LIGHTBLUE);
    }
    app.messagebox("Message from {app.title}", "Hello, world!");
}

Features

  • Tiny VM with low system resource requirements
  • Minimal C requirements: any C99-like compiler (avr-gcc and openwatcom are both supported)
  • Allocation-free parser and custom allocator support for parsing and running scripts on resource-constrained devices
  • Pluggable string system to build your own to support extended character sets or memory requirements
  • Binary script format for pre- or external compilation in constrained applications
  • Comprehensive control structures: if/else, for over iterators, loop, break/continue
  • IDL-based bindings to your code with dispatch code generator
  • Basic list support (improvements coming in later revisions)
  • String interpolation by default
  • Varargs-style invocation

Limitations

  • The string system currently assumes ASCII, though it will work with UTF-8 in some cases (some functions may not work properly in the presence of multi-byte, extended UTF-8 characters).
  • Lists are currently immutable and the design for mutable lists/list builders is not complete.
  • Dictionaries and/or maps are not implemented.
  • Objects may not be defined by script code, and object functions are not available.

Logo & Name

Logo and name thanks to 🚴🏽‍♀️@ojeda-e.

Getting Started

Read the Language Guide for tips on getting started. Check out the DOS and Arduino/AVR samples for examples of how you might get started.