From: grue <grue@mail.ru>
Date: Fri, 10 Feb 2006 10:00:54 +0000 (+0000)
Subject: add function "child" that returns the first child of an object
X-Git-Url: https://jxself.org/git/?a=commitdiff_plain;h=09e2ca3c7abae98d97cbd8efedc45482e15c6169;p=lifp.git

add function "child" that returns the first child of an object

darcs-hash:549f16b097c58f4103c59bb19c0b35a2bdf43461
---

diff --git a/if.lisp b/if.lisp
index 6a0a3c2..881c629 100644
--- a/if.lisp
+++ b/if.lisp
@@ -40,7 +40,7 @@
            :read-property :rp :read-property- 
            :exec :exec*
            :abstractobject :name :names :parent :children :flags
-           :initflags :add-flags :has :hasnt :-> :give
+           :initflags :add-flags :has :hasnt :-> :give :child
            :ifclass :object :defaction :*meta*
            :move :rmv :ofclass :among
            :verb :extend-verb :extend-verb-first
@@ -369,6 +369,10 @@ word in dictionary, add it."
   (not (intersection flags (flags obj))))
   ;(not (subsetp flags (flags obj))))
 
+(defun child (obj)
+  "Returns the first child of the object"
+  (car (children obj)))
+
 (defmethod parser ((obj abstractobject) words) 
   "Default parser. Really bad one."
   (when (zerop (length words)) (return-from parser 0))