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.
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]
Squirrel uses a C-like syntax, albeit inspired by that of Lua as well.
local function factorial(x) // Getting function which is factorial, then getting value which is x { if (x <= 1) { // if x is less than 1 return 1; // then the code will just return 1 } else { // if that doesn't work return x * factorial(x-1); // then the code will return x times 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");
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();
The language was made public in 2003 under the zlib/libpng license.[23] In November 2010, the license was changed to the MIT license to enable the project to be hosted on Google Code.[24][25] It is developed and maintained by Alberto Demichelis.