bbcode v0.1

[bbcode]
[title="Hello World"]
[author="Anonymous"]

[main]
  [let="a"]5[/let]
  [while]a>0[do]
  [let="a"]a-1[/let]
  Hello, World!
  [val="a"]
  [/do]
  [/while]
  [call="test"]
[/main]

[test]
hihihi world!
[/test]

[/bbcode]

suggest and improve.

I've been working on a BBCode implementation myself.  This is what I have so far (about three hours of work, I'd say):
[foldr]
  [d]asd [_][*]a[/*][*]b[/*][/_]
    [add][_][*]$a[/*][*]$b[/*][/_][/add]
  [/d]
  0
  [_][*]1[/*][*]2[/*][*]3[/*][/_]
[/foldr]
6
I suppose the syntax could need some fixin' ;)  It's all really inconsistent.  foldr and add are primitives (I also have a cudder primitive):
prim_cudder fs ((BBList (_:xs)):_) = BBList xs
prim_add    fs ((BBList ((BBInt a):(BBInt b):_)):_) = BBInt (a + b)
prim_foldr  fs ((BBSymbol fn args body):x:(BBList xs):_) = foldr (\ a b -> (apply fs body (zip args [a, b]))) x xs
fap fap fap