Squirrel (programming language)

Squirrel
Paradigm Multi-paradigm: scripting, imperative, functional, object-oriented
Designed by Alberto Demichelis
First appeared 2003
3.0.7 / October 7, 2015
Dynamic
OS Cross-platform
License MIT license
.nut
Website squirrel-lang.org

Squirrel is a high level imperative, object-oriented programming language, designed to be a light-weight scripting language that fits in the size, memory bandwidth, and real-time requirements of applications like video games and hardware such as Electric Imp.

MirthKit, a simple toolkit for making and distributing open source, cross-platform 2D games, uses Squirrel for its platform.[1] It is used extensively by Code::Blocks for scripting and was also used in Final Fantasy Crystal Chronicles: My Life as a King[2][3] It is also used in Left 4 Dead 2 and Portal 2 for scripted events.[4]

Language features

Syntax

Squirrel uses a C-like syntax.

Factorial in Squirrel:

  function factorial(x)
  {
    if (x == 0) {
      return 1;
    }
    else {
      return x * factorial(x-1);
    }
  }

Generators:

  function not_a_random_number_generator(max) {
    local last = 42;
    local IM = 139968;
    local IA = 3877;
    local IC = 29573;
    for(;;) { // loops forever
      yield (max * (last = (last * IA + IC) % IM) / IM);
    }
  }
 
  local randtor = not_a_random_number_generator(100);
 
  for(local i = 0; i < 10; i += 1)
     print(">"+resume randtor+"\n");

Classes and inheritance:

  class BaseVector {
    constructor(...)
    {
      if(vargv.len() >= 3) {
        x = vargv[0];
        y = vargv[1];
        z = vargv[2];
      }
    }
    x = 0;
    y = 0;
    z = 0;
  }
 
  class Vector3 extends BaseVector {
    function _add(other)
    {
      if(other instanceof ::Vector3)
        return ::Vector3(x+other.x,y+other.y,z+other.z);
      else
        throw "wrong parameter";
    }
    function Print()
    {
      ::print(x+","+y+","+z+"\n");
    }
  }
 
  local v0 = Vector3(1,2,3)
  local v1 = Vector3(11,12,13)
  local v2 = v0 + v1;
  v2.Print();

Applications

Non-game applications using Squirrel

Games using Squirrel

History

The language was made public in 2003 under the zlib/libpng license.[12] In November 2010, the license was changed to MIT license to enable the project to be hosted on Google Code.[13][14] It is developed and maintained by Alberto Demichelis.

See also

References

  1. ↑ MirthKit Developer Wiki
  2. ↑ Brandon Boyer (21 February 2008). "Gamasutra - GDC 2008 Event Coverage". gamasutra.com. Gamasutra.
  3. ↑ "Exclusive: Behind The Scenes of Final Fantasy's WiiWare Debut". gamasutra.com. Gamasutra. 23 June 2008. Retrieved 22 September 2011.
  4. ↑ L4D2 Vscripts
  5. ↑ "Welcome to Vice City Multiplayer website!". vicecitymultiplayer.com. Retrieved 2014-05-04.
  6. ↑ 6.0 6.1 6.2 6.3 6.4 "VScript". valvesoftware.com. 2014-08-20. Retrieved 2015-01-17.
  7. ↑ http://wiki.openttd.org/?title=AI:Main_Page&oldid=76593
  8. ↑ http://www.5-mp.com/index
  9. ↑ http://www.iv-multiplayer.com
  10. ↑ http://www.m2-multiplayer.com
  11. ↑ http://blog.thimbleweedpark.com/engine
  12. ↑ "The Squirrel programming language". sourceforge.net. Retrieved 25 September 2011.
  13. ↑ "Moving to code.google.com and MIT License". squirrel-lang.org. Retrieved 25 September 2011.
  14. ↑ "squirrel". google.com. Retrieved 25 September 2011.

External links