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Squirrel (programming language)

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Title: Squirrel (programming language)  
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Subject: MiniD, Lightweight programming language, Lua (programming language), List of object-oriented programming languages, Scripting language
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Squirrel (programming language)

Paradigm(s) Multi-paradigm: scripting, imperative, functional, object-oriented
Designed by Alberto Demichelis
Appeared in 2003
Stable release 3.0.6 / April 2, 2014 (2014-04-02)
Typing discipline Dynamic
Influenced by Lua, Python, C++, JavaScript
Influenced MiniD
OS Cross-platform
License MIT license
Filename extension(s) .nut

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


Squirrel uses a C-like syntax.

Factorial in Squirrel:

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


  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 {
      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);
        throw "wrong parameter";
    function Print()

  local v0 = Vector3(1,2,3)
  local v1 = Vector3(11,12,13)
  local v2 = v0 + v1;


Non-game applications using Squirrel

Games using Squirrel


The language was made public in 2003 under the zlib/libpng license.[10] In November 2010, the license was changed to MIT license to enable the project to be hosted on Google Code.[11][12] It is developed and maintained by Alberto Demichelis.

See also


  1. ^ MirthKit Developer Wiki
  2. ^ Brandon Boyer (21 February 2008). "Gamasutra - GDC 2008 Event Coverage".  
  3. ^ "Exclusive: Behind The Scenes of Final Fantasy's WiiWare Debut".  
  4. ^ L4D2 Vscripts
  5. ^ "Welcome to Vice City Multiplayer website!". Retrieved 2014-05-04. 
  6. ^
  7. ^
  8. ^
  9. ^
  10. ^ "The Squirrel programming language". Retrieved 25 September 2011. 
  11. ^ "Moving to and MIT License". Retrieved 25 September 2011. 
  12. ^ "squirrel". Retrieved 25 September 2011. 

External links

  • Squirrel Home Page
  • SquirrelWiki
  • Squirrel Documentation Project (Searchable)
  • MirthKit Home Page
  • L4D2 Vscripts
  • SquiLu Squirrel modified with lua libraries
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