Squirrel (programming language)

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

Squirrel
ParadigmMulti-paradigm: scripting, imperative, functional, object-oriented
Designed byAlberto Demichelis
First appearedSeptember 6, 2003 (2003-09-06)
Stable release
3.2[1] Edit this on Wikidata / 10 February 2022 (10 February 2022)
Typing disciplineDynamic
OSCross-platform
LicenseMIT license
Filename extensions.nut
Websitesquirrel-lang.org
Influenced by
C++, JavaScript, Lua, Python
Influenced
MiniD

MirthKit, a simple toolkit for making and distributing open source, cross-platform 2D games, uses Squirrel for its platform.[2] It is used extensively by Code::Blocks for scripting and was also used in Final Fantasy Crystal Chronicles: My Life as a King.[3][4] It is also used in Left 4 Dead 2, Portal 2 and Thimbleweed Park for scripted events and in NewDark, an unofficial Thief 2: The Metal Age engine update, to facilitate additional, simplified means of scripting mission events, aside of the regular C scripting.[5]

Language features

Syntax

Squirrel uses a C-like syntax.

Factorial in Squirrel
function factorial(x)
{
  if (x <= 1) {
    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

Applications using Squirrel

  • Code::Blocks, integrated development environment
  • Enduro/X, cluster application server
  • Electric Imp, an end-to-end IoT platform[6]

Games using Squirrel

History

The language was made public in 2003 under the zlib/libpng license.[20] In November 2010, the license was changed to the MIT license to enable the project to be hosted on Google Code.[21][22] It is developed and maintained by Alberto Demichelis.

See also

References

  1. "squirrel/HISTORY at master - albertodemichelis/squirrel - GitHub".
  2. MirthKit Developer Wiki Archived 2014-02-11 at the Wayback Machine
  3. Brandon Boyer (21 February 2008). "Gamasutra - GDC 2008 Event Coverage". gamasutra.com. Gamasutra.
  4. "Exclusive: Behind The Scenes of Final Fantasy's WiiWare Debut". gamasutra.com. Gamasutra. 23 June 2008. Retrieved 22 September 2011.
  5. "L4D2 Vscripts - Valve Developer Community". developer.valvesoftware.com. Retrieved 2018-07-06.
  6. "Electric Imp programming guide". electricimp.com.
  7. "VScript". valvesoftware.com. 2014-08-20. Retrieved 2015-01-17.
  8. "th155-decomp". GitHub. Retrieved 2020-10-19.
  9. "WHAT in the hell, is consumable nut? Please help this is an error code I got, have any of you got this before?". reddit.com. 2019-03-24. Retrieved 2021-09-04.
  10. "iv-multiplayer.com". www.iv-multiplayer.com. Archived from the original on 2012-06-07. Retrieved 2018-07-06.
  11. "Liberty Unleashed". Retrieved 2019-12-04.
  12. "m2-multiplayer.com". www.m2-multiplayer.com. Archived from the original on 2013-01-02. Retrieved 2018-07-06.
  13. "AI:Main Page - OpenTTD". wiki.openttd.org. Retrieved 2018-07-06.
  14. "Simutrans-Squirrel-API: Main Page". dwachs.github.io. Retrieved 2018-07-06.
  15. "The VG Resource Wiki". wiki.vg-resource.com. Retrieved 2021-09-04.
  16. "Thimbleweed Park Blog- Engine". blog.thimbleweedpark.com. Retrieved 2018-07-06.
  17. "NewDark 1.25: Squirrel script?". ttlg.com. 2017-03-20. Retrieved 2019-12-25.
  18. Vice City Multiplayer
  19. "Welcome To VC-MP website!". Archived from the original on 2006-04-05. Retrieved 2014-05-04.
  20. "The Squirrel programming language". SourceForge. Retrieved 2018-07-06.
  21. "Moving to code.google.com and MIT License - The Language - Squirrel - The Programming Language". forum.squirrel-lang.org. Retrieved 2018-07-06.
  22. "Google Code Archive - Long-term storage for Google Code Project Hosting". code.google.com. Retrieved 2018-07-06.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.