X-Git-Url: https://git.jsancho.org/?p=gacela.git;a=blobdiff_plain;f=src%2Fsystem.scm;h=26e31c6f52dc66b419341a75b62d226c9c33426c;hp=3c8454821b733e432dcef33fb9efb8d900bd4d10;hb=9ab0fd2802207cff18dd474ec5504f580b5d9856;hpb=0f49b8fac5821694a2db6f88b95423e5ad8aa719

diff --git a/src/system.scm b/src/system.scm
index 3c84548..26e31c6 100644
--- a/src/system.scm
+++ b/src/system.scm
@@ -18,7 +18,8 @@
 (define-module (gacela system)
   #:use-module (ice-9 receive)
   #:use-module (srfi srfi-1)
-  #:use-module (srfi srfi-9))
+  #:use-module (srfi srfi-9)
+  #:use-module (srfi srfi-9 gnu))
 
 
 ;;; Component definitions
@@ -28,19 +29,35 @@
    (string-concatenate
     (map (lambda (a) (if (symbol? a) (symbol->string a) a)) args))))
 
-(define-macro (define-component name . args)
-  `(begin
-     (use-modules (srfi srfi-9) (srfi srfi-9 gnu))
-     (define-record-type ,name
-       (,(symbol-concatenate "make-" name) ,@args)
-       ,(symbol-concatenate name "?")
-       ,@(map (lambda (a) (list a (symbol-concatenate name "-" a) (symbol-concatenate "set-" name "-" a "!"))) args))
-     (set-record-type-printer! ,name
-       (lambda (record port)
-	 (format port "#<[~a]" ',name)
-	 ,@(map (lambda (a) `(format port " ~a: ~a" ',a (,(symbol-concatenate name "-" a) record))) args)
-	 (format port ">")))
-     ',name))
+(define-syntax define-component
+  (lambda (x)
+    (define (concat . args)
+      (datum->syntax x
+        (apply symbol-concatenate
+	  (map (lambda (a)
+		 (if (string? a)
+		     a
+		     (syntax->datum a)))
+	       args))))
+    (syntax-case x ()
+      ((_ name field ...)
+       (with-syntax ((make-name (concat "make-" #'name))
+		     (name? (concat #'name "?"))
+		     ((field-getter ...) (map (lambda (f) (concat #'name "-" f)) #'(field ...)))
+		     ((field-setter ...) (map (lambda (f) (concat "set-" #'name "-" f "!")) #'(field ...))))
+         #'(begin
+	     (define-record-type name
+	       (make-name field ...)
+	       name?
+	       (field field-getter field-setter)
+	       ...)
+	     (set-record-type-printer! name
+	       (lambda (record port)
+		 (format port "#<[~a]" 'name)
+		 (format port " ~a: ~a" 'field (field-getter record))
+		 ...
+		 (format port ">")))
+	     'name))))))
 
 (define (export-component component)
   (let ((name (record-type-name component))
@@ -97,63 +114,70 @@
 		   (else
 		    (assoc-set! clist type elist))))))))
 
-(define (new-entity new-components entities components)
-  (let ((key (gensym))
-	(nc (normalize-components new-components)))
-    (values
-     (acons key nc entities)
-     (register-components key
-			  (map (lambda (c) (car c)) nc)
-			  components)
-     key)))
-
-(define (remove-entity key entities components)
-  (let ((clist (map (lambda (c) (car c)) (assoc-ref entities key))))
-    (values
-     (assoc-remove! entities key)
-     (unregister-components key clist components))))
-
-(define (set-entity key new-components entities components)
-  (let* ((nc (normalize-components new-components))
-	 (clist (map (lambda (c) (car c)) (assoc-ref entities key)))
-	 (nclist (map (lambda (c) (car c)) nc)))
-    (values
-     (assoc-set! entities key nc)
-     (register-components key (lset-difference eq? nclist clist)
-			  (unregister-components key (lset-difference eq? clist nclist) components)))))
-
-(define (set-entity-components key new-components entities components)
-  (define (set-components clist new-components)
-    (cond ((null? new-components)
-	   clist)
-	  (else
-	   (set-components
-	    (if (cdar new-components)
-		(assoc-set! clist (caar new-components) (cdar new-components))
-		(assoc-remove! clist (caar new-components)))
-	    (cdr new-components)))))
-  (set-entity key (set-components (alist-copy (assoc-ref entities key)) (normalize-components new-components)) entities components))
-
-(define (set-entities new-entities entities components)
-  (cond ((null? new-entities)
+(define (new-entity . new-components)
+  (lambda (entities components)
+    (let ((key (gensym))
+	  (nc (normalize-components new-components)))
+      (values
+       (acons key nc entities)
+       (register-components key
+			    (map (lambda (c) (car c)) nc)
+			    components)
+       key))))
+
+(define (remove-entity key)
+  (lambda (entities components)
+    (let ((clist (map (lambda (c) (car c)) (assoc-ref entities key))))
+      (values
+       (assoc-remove! entities key)
+       (unregister-components key clist components)))))
+
+(define (set-entity key . new-components)
+  (lambda (entities components)
+    (let* ((nc (normalize-components new-components))
+	   (clist (map (lambda (c) (car c)) (assoc-ref entities key)))
+	   (nclist (map (lambda (c) (car c)) nc)))
+      (values
+       (assoc-set! entities key nc)
+       (register-components key (lset-difference eq? nclist clist)
+			    (unregister-components key (lset-difference eq? clist nclist) components))))))
+
+(define (set-entity-components key . new-components)
+  (lambda (entities components)
+    (let ((nc (normalize-components new-components))
+	  (clist (alist-copy (assoc-ref entities key))))
+      (for-each
+       (lambda (c)
+	 (assoc-set! clist (car c) (cdr c)))
+       nc)
+      (values
+       (assoc-set! entities key clist)
+       (register-components key (map (lambda (c) (car c)) nc) components)))))
+
+(define (remove-entity-components key . old-components)
+  (lambda (entities components)
+    (let ((clist (alist-copy (assoc-ref entities key))))
+      (for-each
+       (lambda (c)
+	 (assoc-remove! clist c))
+       old-components)
+      (values
+       (assoc-set! entities key clist)
+       (unregister-components key old-components components)))))
+
+(define (modify-entities changes entities components)
+  (cond ((null? changes)
 	 (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)))))))
-
-   
+	 (receive (e c) ((car changes) entities components)
+	   (modify-entities (cdr changes) e c)))))
+
 (export new-entity
 	remove-entity
 	set-entity
 	set-entity-components
-	set-entities)
+	remove-entity-components
+	modify-entities)
 
 
 ;;; Making systems
@@ -166,19 +190,24 @@
 	   (cond ((null? (cdr t)) e*)
 		 (else
 		  (lset-intersection eq? e* (find-entities-by-components c (cdr t)))))))))
-		  
-
-(define (make-system component-types system-fun)
-  (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 (car x) component-types)) (cdr x)))) e*))
-	   (res (system-fun e**)))
-      (lambda* (#:optional (entities2 #f) (components2 #f))
-	(let ((e (if (and entities2 components2) entities2 entities))
-	      (c (if (and entities2 components2) components2 components)))
-	  (set-entities res e c))))))
 
+(define-syntax make-system
+  (syntax-rules ()
+    ((_ component-types system-func)
+     (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 (car x) 'component-types)) (cdr x)))) e*))
+	      (res (system-func e**)))
+	 (lambda* (#:optional (entities2 #f) (components2 #f))
+	   (let ((e (if (and entities2 components2) entities2 entities))
+		 (c (if (and entities2 components2) components2 components)))
+	     (modify-entities res e c))))))))
+
+(define-syntax define-system
+  (syntax-rules ()
+    ((_ (name . component-types) system-func)
+     (define name (make-system component-types system-func)))))
 
 (define (join-systems . systems)
   (lambda (entities components)
@@ -189,7 +218,6 @@
 	     (receive (e2 c2) (((car s) e c))
 	       (run (cdr s) e2 c2)))))))
 
-
 (define (threaded-systems . systems)
   (lambda (entities components)
     (let run-wait ((thd
@@ -205,8 +233,20 @@
 	     (receive (e2 c2) ((join-thread (car thd)) e c)
 	       (run-wait (cdr thd) e2 c2)))))))
 
-
 (export find-entities-by-components
+	define-system
 	make-system
 	join-systems
 	threaded-systems)
+
+
+;;; Entities and components access inside systems
+
+(define (get-key entity)
+  (car entity))
+
+(define (get-component component-name entity)
+  (assoc-ref (cdr entity) component-name))
+
+(export get-key
+	get-component)