X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fpackage.lisp;h=6fd379be7fe1107cf7defb8fbaed71613030b4b8;hb=d0e2cc2ea3ae036fba1d085b9c88a5ffe24de956;hp=30170ed2cce85d4821bae0193b4cadfc8cda93d7;hpb=2f2f13a33f1709db600db126312d9b6b9ca42909;p=jscl.git

diff --git a/src/package.lisp b/src/package.lisp
index 30170ed..6fd379b 100644
--- a/src/package.lisp
+++ b/src/package.lisp
@@ -20,16 +20,28 @@
 (defun list-all-packages ()
   (copy-list *package-list*))
 
-(defun make-package (name &key use)
-  (let ((package (new))
-        (use (mapcar #'find-package-or-fail use)))
-    (setf (oget package "packageName") (string name))
+(defun %make-package (name use)
+  (let ((package (new)))
+    (setf (oget package "packageName") name)
     (setf (oget package "symbols") (new))
     (setf (oget package "exports") (new))
     (setf (oget package "use") use)
-    (push package *package-list*)
+    (if (find name *package-list* :key (lambda (s) (oget s "packageName")) :test #'equal)
+        (error "A package namded `~a' already exists." name)
+        (push package *package-list*))
     package))
 
+(defun resolve-package-list (packages)
+  (let (result)
+    (dolist (package (mapcar #'find-package-or-fail packages))
+      (pushnew package result :test #'eq))
+    (reverse result)))
+
+(defun make-package (name &key use)
+  (%make-package
+   (string name)
+   (resolve-package-list use)))
+
 (defun packagep (x)
   (and (objectp x) (in "symbols" x)))
 
@@ -79,6 +91,26 @@
   `(eval-when (:compile-toplevel :load-toplevel :execute)
      (setq *package* (find-package-or-fail ',string-designator))))
 
+(defmacro defpackage (package &rest options)
+  (let (use)
+    (dolist (option options)
+      (ecase (car option)
+       (:use
+        (setf use (append use (cdr option))))))
+    `(eval-when (:compile-toplevel :load-toplevel :execute)
+       (%defpackage ',(string package) ',use))))
+
+(defun redefine-package (package use)
+  (setf (oget package "use") use)
+  package)
+
+(defun %defpackage (name use)
+  (let ((package (find-package name))
+        (use (resolve-package-list use)))
+    (if package
+        (redefine-package package use)
+        (%make-package name use))))
+
 ;; This function is used internally to initialize the CL package
 ;; with the symbols built during bootstrap.
 (defun %intern-symbol (symbol)