Infra: Rudimentary setup system.

[clg] / gffi / interface.lisp

diff --git a/gffi/interface.lisp b/gffi/interface.lisp
index 72aa21b..6b918d2 100644 (file)
--- a/gffi/interface.lisp
+++ b/gffi/interface.lisp
@@ -20,7 +20,7 @@
 ;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 ;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
-;; $Id: interface.lisp,v 1.8 2007-11-29 18:37:14 espen Exp $
+;; $Id: interface.lisp,v 1.10 2008-12-10 02:40:18 espen Exp $
 
 (in-package "GFFI")
 
@@ -72,15 +72,19 @@
       #'string-capitalize    
       (cons prefix (split-string (symbol-name type-name) :delimiter #\-))))))
 
-(defun default-type-name (alien-name)
-  (let ((parts
-        (mapcar
-         #'string-upcase
-         (split-string-if alien-name #'upper-case-p))))
-    (intern
-     (concatenate-strings (rest parts) #\-)
-     (find-prefix-package (first parts)))))
+(defun split-alien-name (alien-name)
+  (let ((parts (split-string-if alien-name #'upper-case-p)))
+    (do ((prefix (first parts) (concatenate 'string prefix (first rest)))
+         (rest (rest parts) (cdr rest)))
+        ((null rest)
+         (error "Couldn't split alien name '~A' to find a registered prefix"
+                alien-name))
+      (when (find-prefix-package prefix)
+        (return (values (string-upcase (concatenate-strings rest #\-))
+                        (find-prefix-package prefix)))))))
 
+(defun default-type-name (alien-name)
+  (multiple-value-call #'intern (split-alien-name alien-name)))
 
 (defun in-arg-p (style)
   (find style '(:in :in/out :in/return :in-out :return)))
@@ -92,6 +96,29 @@
   (find style '(:in/return :return)))
 
 (defmacro defbinding (name lambda-list return-type &rest args)
+  "This defines a foreign function call. NAME should either be a symbol or a
+list (LISP-SYM STRING). The lisp function will be given the name of the lisp
+symbol and the foreign function name is either the string given or automatically
+generated using DEFAULT-ALIEN-FNAME.
+
+If LAMBDA-LIST is nil, the lambda list for the generated lisp function is
+automatically computed from the input arguments as described below. If it is
+non-nil, it gives the lambda list for the function. To manually specify an empty
+lambda list, pass (NIL) which gets recognised as a special value.
+
+RETURN-TYPE should be a valid type.
+
+A normal element of ARGS is a list matching
+
+  (EXPR TYPE &OPTIONAL (STYLE :IN) (OUT-TYPE TYPE))
+
+however a shorthand form for an input parameter with name the same as its type
+is that you can just give the atom TYPE as an argument. The lambda-list for the
+function is the list of all input arguments, although if an EXPR is repeated, it
+will only appear once. To add a constant argument, define one with STYLE :IN and
+EXPR the value it should take.
+
+To give the binding a docstring, pass a string as the first element of ARGS."
   (multiple-value-bind (lisp-name c-name)
       (if (atom name)
          (values name (default-alien-fname name))
@@ -216,7 +243,8 @@
                     when (out-arg-p style)
                     collect (return-type out-type)
                     when (return-arg-p style)
-                    collect (return-type type)))))))
+                    collect (return-type type))))
+               ,lisp-name)))
          (defun ,lisp-name ,lambda-list
          ,doc
          (let ,aux-bindings
@@ -419,6 +447,12 @@
 
 ;;;; Type expansion
 
+;; A hack to make the TYPE-EXPAND code for SBCL work.
+#?+(pkg-config:sbcl>= 1 0 35 15)
+(sb-ext:without-package-locks
+  (setf (symbol-function 'sb-kernel::type-expand)
+        (lambda (form) (typexpand form))))
+
 (defun type-expand-1 (form)
   #+(or cmu sbcl)
   (let ((def (cond ((symbolp form)
@@ -444,6 +478,8 @@
                   (error "~A can not be expanded to ~A" form type))))))
     (expand form)))
 
+(defun type-equal-p (type1 type2)
+  (and (subtypep type1 type2) (subtypep type2 type1)))
 
 
 ;;;; Type methods