Squirrel (programming language)

• Dynamic typing • Delegation • Classes, inheritance • Higher-order functions • Generators • Cooperative threads (coroutines) • Tail recursion • Exception handling • Automatic memory management (mainly reference counting with backup garbage collector) • Weak references • Both compiler and virtual machine fit together in about 7k lines of C++ code • Optional support for UCS-2 wide strings ==Syntax==

Squirrel uses a C-like syntax, albeit inspired by that of Lua as well. ;Factorial in Squirrel: local function factorial(x) // Getting function which is factorial, then getting value which is x { if (x ;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 "+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 Games using Squirrel • Alien Swarm • Apex Legends • Battle Brothers • Contagion a mod for Gothic II • GTA IV IV-MP • Left 4 Dead 2 • Liberty Unleashed • Mafia II M2-Multiplayer • Melty Blood: Type Lumina • Nuclear Dawn • Portal 2 • Shadow Warrior • Simutrans • Sonic Unleashed (PS2/Wii) • SuperTux • Team Fortress 2 • Thimbleweed Park • Thief II (unofficial NewDark engine update) • Titanfall a mod for Grand Theft Auto: Vice City • Under Night In-Birth • War Thunder • Zero no Tsukaima - Maigo no Period to Ikusen no Symphony (PS2) • Zero no Tsukaima - Muma ga Tsumugu Yokaze no Nocturne (PS2) • Zero no Tsukaima - Shou-akuma to Harukaze no Concerto (PS2) ==History==

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