Making systems; systems return a lambda function for process

[gacela.git] / src / system.scm

diff --git a/src/system.scm b/src/system.scm
index ea9476ab51bbd226286865323b095f7d4e688163..d3566652bd0e8e995fe0fe684d4bd6dfdfc3aee1 100644 (file)
--- a/src/system.scm
+++ b/src/system.scm
@@ -16,6 +16,7 @@
 
 
 (define-module (gacela system)
+  #:use-module (ice-9 receive)
   #:use-module (srfi srfi-1)
   #:use-module (srfi srfi-9))
 
@@ -123,11 +124,26 @@
            (cdr new-components)))))
   (set-entity key (set-components (alist-copy (assoc-ref entities key)) new-components) entities components))
 
+(define (set-entities new-entities entities components)
+  (cond ((null? new-entities)
+        (values entities components))
+       (else
+        (cond ((not (caar new-entities))
+               (receive (e c k) (new-entity (cdar new-entities) entities components)
+                        (set-entities (cdr new-entities) e c)))
+              ((not (cdar new-entities))
+               (receive (e c) (remove-entity (caar new-entities) entities components)
+                        (set-entities (cdr new-entities) e c)))
+              (else
+               (receive (e c) (set-entity-components (caar new-entities) (cdar new-entities) entities components)
+                        (set-entities (cdr new-entities) e c)))))))
+
    
 (export new-entity
        remove-entity
        set-entity
-       set-entity-components)
+       set-entity-components
+       set-entities)
 
 
 ;;; Making systems
@@ -146,24 +162,13 @@
   (lambda (entities components)
     (let* ((e (find-entities-by-components components component-types))
           (e* (map (lambda (x) (assoc x entities)) e))
-          (e** (map (lambda (x) (cons (car x) (filter (lambda (x) (memq (get-component-type x) component-types)) (cdr x)))) e*))
+          (e** (map (lambda (x) (cons (car x) (filter (lambda (x) (memq (car x) component-types)) (cdr x)))) e*))
           (res (system-fun e**)))
       (lambda* (#:optional (entities2 #f) (components2 #f))
-        (let* ((e2 (if (and entities2 components2)
-                      (find-entities-by-components components2 component-types)
-                      e))
-              (e2* (if (and entities2 components2)
-                       (map (lambda (x) (assoc x entities2)) e2)
-                       e*))
-              (e2** (if (and entities2 components2)
-                        (map (lambda (x) (cons (car x) (filter (lambda (x) (memq (get-component-type x) component-types)) (cdr x)))) e2*)
-                        e**)))
-         e2**)))))
-
-; ((1 a b) (2 a b c) (3 c))
-; ((1 a b) (2 a b))
-; ((1 a) (a b))
-; ((1 a) (3 c) (4 a b))
+       (let ((e (if (and entities2 components2) entities2 entities))
+             (c (if (and entities2 components2) components2 components)))
+         (set-entities res e c))))))
+
 
 (export find-entities-by-components
        make-system)