X-Git-Url: https://git.jsancho.org/?a=blobdiff_plain;f=src%2Futils.scm;h=5f56f0528703c5ad3d92da0e538d475019e48060;hb=HEAD;hp=015de6b68b5f52c9f882a518df9ef2f121e7dd81;hpb=116bad1867d3517df596dc004ef0f6e54bb7d290;p=gacela.git

diff --git a/src/utils.scm b/src/utils.scm
index 015de6b..5f56f05 100644
--- a/src/utils.scm
+++ b/src/utils.scm
@@ -1,5 +1,5 @@
 ;;; Gacela, a GNU Guile extension for fast games development
-;;; Copyright (C) 2009 by Javier Sancho Fernandez <jsf at jsancho dot org>
+;;; Copyright (C) 2016 by Javier Sancho Fernandez <jsf at jsancho dot org>
 ;;;
 ;;; This program is free software: you can redistribute it and/or modify
 ;;; it under the terms of the GNU General Public License as published by
@@ -16,130 +16,18 @@
 
 
 (define-module (gacela utils)
-  #:export (use-cache-with
-	    arguments-calling
-	    arguments-apply
-	    bound?))
-
-
-;;; Cache for procedures
-
-(define (use-cache-with proc)
-  "Cache for procedures"
-  (let ((cache (make-weak-value-hash-table)))
-    (lambda (. param)
-      (let* ((key param)
-	     (res (hash-ref cache key)))
-	(cond (res res)
-	      (else
-	       (set! res (apply proc param))
-	       (hash-set! cache key res)
-	       res))))))
-
-
-;;; Playing with procedures arguments
-
-(define undefined)
-(define (bound? var) (not (eq? var undefined)))
-
-(define (required-arguments args values)
-  "Return an alist with required arguments and their values"
-  (define (f vars values)
-    (cond ((null? vars) '())
-	  ((null? values) (assoc-set! (f (cdr vars) '())
-				      (car vars)
-				      undefined))
-	  (else (assoc-set! (f (cdr vars) (cdr values))
-			    (car vars)
-			    (car values)))))
-  (f (assoc-ref args 'required) values))
-
-(define (optional-arguments args values)
-  "Return an alist with optional arguments and their values"
-  (define (f vars values)
-    (cond ((null? vars) '())
-	  ((null? values) (assoc-set! (f (cdr vars) '())
-				      (car vars)
-				      undefined))
-	  (else (assoc-set! (f (cdr vars) (cdr values))
-			    (car vars)
-			    (car values)))))
-  (f (assoc-ref args 'optional)
-     (list-tail values
-		(min (length (assoc-ref args 'required))
-		     (length values)))))
-
-(define (keyword-arguments args values)
-  "Return an alist with keyword arguments and their values"
-  (define (f vars values)
-    (cond ((null? vars) '())
-	  (else
-	   (let ((val (member (car vars) values)))
-	     (assoc-set! (f (cdr vars) values)
-			    (keyword->symbol (car vars))
-			    (if val (cadr val) undefined))))))
-  (f (map (lambda (x) (car x)) (assoc-ref args 'keyword)) values))
-
-(define (rest-arguments args values)
-  "Return an alist with rest arguments"
-  (let ((rest (assoc-ref args 'rest)))
-    (cond (rest (assoc-set! '()
-			    rest
-			    (list-tail values
-				       (min (+ (length (assoc-ref args 'required))
-					       (length (assoc-ref args 'optional)))
-					    (length values)))))
-	  (else '()))))
-
-(define (arguments-calling proc values)
-  "Return an alist with procedure arguments and their values"
-  (let ((args ((@ (ice-9 session) procedure-arguments) proc)))
-    (append (required-arguments args values)
-	    (optional-arguments args values)
-	    (keyword-arguments args values)
-	    (rest-arguments args values))))
-
-(define (required-arguments-apply args values)
-  "Return a list with required arguments for use with apply"
-  (define (f vars values)
-    (cond ((null? vars) '())
-	  (else 
-	   (cons (assoc-ref values (car vars))
-		 (f (cdr vars) values)))))
-  (f (assoc-ref args 'required) values))
-
-(define (optional-arguments-apply args values)
-  "Return a list with optional arguments for use with apply"
-  (define (f vars values)
-    (cond ((null? vars) '())
-	  (else (let ((a (f (cdr vars) values))
-		      (val (assoc (car vars) values)))
-		  (cond ((and val (bound? (cdr val)))
-			 (cons (cdr val) a))
-			(else a))))))
-  (f (assoc-ref args 'optional) values))
-
-(define (keyword-arguments-apply args values)
-  "Return a list with keyword arguments for use with apply"
-  (define (f vars values)
-    (cond ((null? vars) '())
-	  (else (let ((a (f (cdr vars) values))
-		      (val (assoc (keyword->symbol (car vars)) values)))
-		  (cond ((and val (bound? (cdr val)))
-			 (cons (car vars) (cons (cdr val) a)))
-			(else a))))))
-  (f (map (lambda (x) (car x)) (assoc-ref args 'keyword)) values))
-
-(define (rest-arguments-apply args values)
-  "Return a list with rest arguments for use with apply"
-  (let ((rest (assoc-ref args 'rest)))
-    (cond (rest (assoc-ref values rest))
-	  (else '()))))
-  
-(define (arguments-apply proc values)
-  "Return a list for use with apply"
-  (let ((args ((@ (ice-9 session) procedure-arguments) proc)))
-    (append (required-arguments-apply args values)
-	    (optional-arguments-apply args values)
-	    (keyword-arguments-apply args values)
-	    (rest-arguments-apply args values))))
+  #:export (make-producer))
+
+(define (make-producer body)
+  (define resume #f)
+  (lambda (real-send)
+    (define send-to real-send)
+    (define (send value-to-send)
+      (set! send-to
+	(call/cc
+	 (lambda (k)
+	   (set! resume k)
+	   (send-to value-to-send)))))
+    (if resume
+	(resume real-send)
+	(body send))))