Squirrel (programming language)
Paradigm | Multi-paradigm: scripting, imperative, functional, object-oriented |
---|---|
Designed by | Alberto Demichelis |
First appeared | 2003 |
Stable release |
3.1
/ March 27, 2016 |
Typing discipline | Dynamic |
OS | Cross-platform |
License | MIT license |
Filename extensions | .nut |
Website | squirrel-lang.org |
Influenced by | |
Lua, Python, C++, JavaScript | |
Influenced | |
MiniD |
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
- 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 16-bit character strings
Syntax
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
Non-game applications using Squirrel
- Electric Imp
- Attract Mode
Games using Squirrel
- Vice City Multiplayer (a mod for Grand Theft Auto: Vice City)[5]
- Left 4 Dead 2[6]
- Portal 2[6]
- Alien Swarm[6]
- OpenTTD[7]
- V-Multiplayer[8]
- GTAIV's IV-MP[9]
- Mafia II's M2-Multiplayer[10]
- Counter Strike: Global Offensive[6]
- Shadow Warrior
- War Thunder
- SuperTux
- Liberty Unleashed (a mod for Grand Theft Auto III)
- Sonic Unleashed (PS2/Wii)
- Contagion[6] (PC)
- Thimbleweed Park[11]
- Simutrans[12]
- Grief Syndrome
History
The language was made public in 2003 under the zlib/libpng license.[13] In November 2010, the license was changed to MIT license to enable the project to be hosted on Google Code.[14][15] It is developed and maintained by Alberto Demichelis.
See also
References
- ↑ MirthKit Developer Wiki
- ↑ Brandon Boyer (21 February 2008). "Gamasutra - GDC 2008 Event Coverage". gamasutra.com. Gamasutra.
- ↑ "Exclusive: Behind The Scenes of Final Fantasy's WiiWare Debut". gamasutra.com. Gamasutra. 23 June 2008. Retrieved 22 September 2011.
- ↑ L4D2 Vscripts
- ↑ "Welcome to Vice City Multiplayer website!". vicecitymultiplayer.com. Retrieved 2014-05-04.
- 1 2 3 4 5 "VScript". valvesoftware.com. 2014-08-20. Retrieved 2015-01-17.
- ↑ http://wiki.openttd.org/?title=AI:Main_Page&oldid=76593
- ↑ http://www.5-mp.com/index
- ↑ http://www.iv-multiplayer.com
- ↑ http://www.m2-multiplayer.com
- ↑ http://blog.thimbleweedpark.com/engine
- ↑ http://dwachs.github.io/simutrans-sqapi-doc/
- ↑ "The Squirrel programming language". sourceforge.net. Retrieved 25 September 2011.
- ↑ "Moving to code.google.com and MIT License". squirrel-lang.org. Retrieved 25 September 2011.
- ↑ "squirrel". google.com. 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