(no commit message)

[gacela.git] / src / gacela_mobs.scm

diff --git a/src/gacela_mobs.scm b/src/gacela_mobs.scm
index 2f0a39e1ef61f8ef7180ad264b699576826644f5..927d8b138af7125823b8b549e1dcf20605211e83 100755 (executable)
--- a/src/gacela_mobs.scm
+++ b/src/gacela_mobs.scm
@@ -51,12 +51,36 @@
 (define (process-mobs mobs)
   (for-each (lambda (m) (m #:render)) mobs))
 
-(define-macro (define-mob mob-head . look)
-  (let ((name (car mob-head)) (attr (cdr mob-head)))
+
+;;; Actions and looks for mobs
+
+(define (get-attr list name default)
+  (let ((value (assoc-ref list name)))
+    (cond (value (car value))
+         (else default))))
+
+(define (attr-def attr)
+  (let ((name (car attr))
+       (value (cadr attr)))
+    `(,name (get-attr attributes ',name ',value))))
+
+(define (attr-save attr)
+  (let ((name (car attr)))
+    `(assoc-set! attributes ',name (list ,name))))
+
+(define-macro (define-action action-head . code)
+  (let ((name (car action-head)) (attr (cdr action-head)))
     `(define ,name
-       (lambda-mob ,attr ,@look))))
+       (lambda-action ,attr ,@code))))
 
-(define-macro (lambda-mob attr . look)
+(define-macro (lambda-action attr . code)
+  `(lambda (attributes)
+     (let ,(map attr-def attr)
+       ,@code
+       ,(cons 'begin (map attr-save attr))
+       attributes)))
+
+(define-macro (lambda-look . look)
   (define (process-look look)
     (cond ((null? look) (values '() '()))
          (else
@@ -71,13 +95,39 @@
                                     images))))))))
 
   (receive (look-lines look-images) (process-look look)
-          `(let ,(cons `(attr ',attr) look-images)
-             (lambda (option . param)
-               (case option
-                 ((#:get)
-                  (display (assoc-ref attr (car param)))
-                  (display param) (newline))
-                 ((#:render)
-                  (glPushMatrix)
-                  ,@look-lines
-                  (glPopMatrix)))))))
+          `(let ,look-images
+               (lambda ()
+                 (glPushMatrix)
+                 ,@look-lines
+                 (glPopMatrix)))))
+
+
+;;; Making mobs
+
+(define-macro (define-mob mob-head . look)
+  (let ((name (car mob-head)) (attr (cdr mob-head)))
+    `(define ,name
+       (lambda-mob ,attr ,@look))))
+
+(define-macro (lambda-mob attr . look)
+  `(let ((mob #f))
+     (set! mob
+          (let ((attr ',attr) (actions '()) (renders '()))
+            (lambda (option . params)
+              (case option
+                ((get-attr)
+                 attr)
+                ((set-attr)
+                 (if (not (null? params)) (set! attr (car params))))
+                ((get-actions)
+                 actions)
+                ((set-actions)
+                 (if (not (null? params)) (set! actions (car params))))
+                ((get-renders)
+                 renders)
+                ((set-renders)
+                 (if (not (null? params)) (set! renders (car params))))))))
+     (cond ((not (null? ',look))
+           (display ',look)
+           (newline)))
+     mob))