bλcode

D:\Projects\HaskellBBS>ghci BBCode
GHCi, version 6.10.2: http://www.haskell.org/ghc/  :? for help
Loading package ghc-prim ... linking ... done.
Loading package integer ... linking ... done.
Loading package base ... linking ... done.
[1 of 5] Compiling BBCode.Common    ( BBCode\Common.hs, interpreted )
[2 of 5] Compiling BBCode.Parser    ( BBCode\Parser.hs, interpreted )
[3 of 5] Compiling BBCode.Tokenizer ( BBCode\Tokenizer.hs, interpreted )
[4 of 5] Compiling BBCode.Evaluator ( BBCode\Evaluator.hs, interpreted )
[5 of 5] Compiling BBCode           ( BBCode.hs, interpreted )
Ok, modules loaded: BBCode, BBCode.Evaluator, BBCode.Common, BBCode.Parser, BBCode.Tokenizer.
*BBCode> interpret "[define=p][p/][/define][p/]"
Loading package mtl-1.1.0.2 ... linking ... done.
Loading package xhtml-3000.2.0.1 ... linking ... done.
*** Exception: stack overflow
*BBCode> ^Z
Leaving GHCi.

D:\Projects\HaskellBBS>

Looks like I need to implement more security and error handling before I integrate the bλcode interpreter into a BBS.
Anyone has any suggestions for solving the halting problem?

_{I also wanted to brag a bit}

>>22
[(][word]define[/word][(][word]foldr[/word][word]f[/word][word]x[/word][word]list[/word][/(]
  [(][word]if[/word][(][word]null?[/word][word]list[/word][/(]
                    [word]x[/word]
                    [(][word]f[/word][(][word]car[/word][word]list[/word][/(]
                                     [(][word]foldr[/word]
                                        [word]f[/word]
                                        [word]x[/word]
                                        [(][word]cdr[/word][word]list[/word][/(][/(][/(][/(][/(]