Use SWIG for wrapping C++

[guile-irrlicht.git] / Swig / common.scm

diff --git a/Swig/common.scm b/Swig/common.scm
new file mode 100644 (file)
index 0000000..a647f42
--- /dev/null
+++ b/Swig/common.scm
@@ -0,0 +1,70 @@
+;;;************************************************************************
+;;;*common.scm
+;;;*
+;;;*     This file contains generic SWIG GOOPS classes for generated
+;;;*     GOOPS file support
+;;;************************************************************************
+
+(define-module (Swig swigrun))
+
+(define-module (Swig common)
+  #:use-module (oop goops)
+  #:use-module (Swig swigrun))
+
+(define-class <swig-metaclass> (<class>)
+  (new-function #:init-value #f))
+
+(define-method (initialize (class <swig-metaclass>) initargs)
+  (next-method)
+  (slot-set! class 'new-function (get-keyword #:new-function initargs #f)))
+
+(define-class <swig> () 
+  (swig-smob #:init-value #f)
+  #:metaclass <swig-metaclass>
+)
+
+(define-method (initialize (obj <swig>) initargs)
+  (next-method)
+  (slot-set! obj 'swig-smob
+    (let ((arg (get-keyword #:init-smob initargs #f)))
+      (if arg
+        arg
+        (let ((ret (apply (slot-ref (class-of obj) 'new-function) (get-keyword #:args initargs '()))))
+          ;; if the class is registered with runtime environment,
+          ;; new-Function will return a <swig> goops class.  In that case, extract the smob
+          ;; from that goops class and set it as the current smob.
+          (if (slot-exists? ret 'swig-smob)
+            (slot-ref ret 'swig-smob)
+            ret))))))
+
+(define (display-address o file)
+  (display (number->string (object-address o) 16) file))
+
+(define (display-pointer-address o file)
+  ;; Don't fail if the function SWIG-PointerAddress is not present.
+  (let ((address (false-if-exception (SWIG-PointerAddress o))))
+    (if address
+       (begin
+         (display " @ " file)
+         (display (number->string address 16) file)))))
+
+(define-method (write (o <swig>) file)
+  ;; We display _two_ addresses to show the object's identity:
+  ;;  * first the address of the GOOPS proxy object,
+  ;;  * second the pointer address.
+  ;; The reason is that proxy objects are created and discarded on the
+  ;; fly, so different proxy objects for the same C object will appear.
+  (let ((class (class-of o)))
+    (if (slot-bound? class 'name)
+       (begin
+         (display "#<" file)
+         (display (class-name class) file)
+         (display #\space file)
+         (display-address o file)
+         (display-pointer-address o file)
+         (display ">" file))
+       (next-method))))
+                                              
+(export <swig-metaclass> <swig>)
+
+;;; common.scm ends here