Squirrel (programming language)

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This article is about the programming language. For other uses, see Squirrel (disambiguation).

Squirrel is a high level imperative/OO 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.

1 Language features
2 Syntax
3 History
4 See also
5 External links

[edit] Language features

Dynamic typing
Delegation
Classes & inheritance
Higher order functions
Generators
Cooperative threads(coroutines)
Tail recursion
Exception handling
Automatic memory management (primarily reference counting with backup garbage collector)
Weak references
Both compiler and virtual machine fit together in about 6k lines of C++ code.
Optional 16-bit characters strings

[edit] Syntax

Squirrel uses a C-like syntax

Factorial in Squirrel:

 function factorial(x)
 {      
   if (x == 0) {                      
     return 1;                   
   }
   else {
     return x * factorial(x-1);
   }
 }

Random numbers using generators:

 function gen_random(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 = gen_random(100);
 
 for(local i = 0; i < 10; i += 1)
    print(">"+resume randtor+"\n");

Classes and inheritance:

 class BaseVector {
   constructor(...)
   {
     if(vargc >= 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 this.getclass())
       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();