X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Frandom.lisp;h=53f423b53da6a85b38702d318405354a43e9061b;hb=5c649363640c2060387ed91132791e52e2c52c11;hp=ba0abf8d7833381ce3d65e0e1f697760361cff76;hpb=25b02b6e536197f46c8951fed21a452340328bb9;p=fiveam.git

diff --git a/src/random.lisp b/src/random.lisp
index ba0abf8..53f423b 100644
--- a/src/random.lisp
+++ b/src/random.lisp
@@ -191,7 +191,8 @@ BOUND)."
           (- (random (min (- most-negative) bound)))))
        type))))
 
-(defun gen-character (&key (code (gen-integer :min 0 :max (1- char-code-limit)))
+(defun gen-character (&key (code-limit char-code-limit)
+                           (code (gen-integer :min 0 :max (1- code-limit)))
                            (alphanumericp nil))
   "Returns a generator of characters.
 
@@ -234,6 +235,21 @@ producs objects."
        repeat (funcall length)
        collect (funcall elements))))
 
+(defun gen-tree (&key (size 20)
+                      (elements (gen-integer :min -10 :max 10)))
+  "Returns a generator which producs random trees. SIZE control
+the approximate size of the tree, but don't try anything above
+ 30, you have been warned. ELEMENTS must be a generator which
+will produce the elements."
+  (labels ((rec (&optional (current-depth 0))
+             (let ((key (random (+ 3 (- size current-depth)))))
+               (cond ((> key 2)
+                      (list (rec (+ current-depth 1))
+                            (rec (+ current-depth 1))))
+                     (t (funcall elements))))))
+    (lambda ()
+      (rec))))
+
 (defun gen-buffer (&key (length (gen-integer :min 0 :max 50))
                         (element-type '(unsigned-byte 8))
                         (elements (gen-integer :min 0 :max (1- (expt 2 8)))))