Squirrel (programming language)

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Squirrel
Paradigm Multi-paradigm: scripting, imperative, functional, object-oriented
Designed by Alberto Demichelis
Appeared in 2003
3.0.6 / April 2, 2014 (2014-04-02)
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[edit]

Syntax[edit]

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[edit]

Non-game applications using Squirrel[edit]

Games using Squirrel[edit]

History[edit]

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[edit]

References[edit]

  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. ^ http://wiki.openttd.org/?title=AI:Main_Page&oldid=76593
  7. ^ http://www.5-mp.com/index
  8. ^ http://www.iv-multiplayer.com
  9. ^ http://www.m2-multiplayer.com
  10. ^ "The Squirrel programming language". sourceforge.net. Retrieved 25 September 2011. 
  11. ^ "Moving to code.google.com and MIT License". squirrel-lang.org. Retrieved 25 September 2011. 
  12. ^ "squirrel". google.com. Retrieved 25 September 2011. 

External links[edit]