Add support for IN/OUTPUT typemaps.

Lib/javascript/jsc/javascriptrun.swg

@@ -253,3 +253,43 @@ void _wrap_SwigPackedData_delete(JSObjectRef obj)
 
 #define SWIG_ConvertMember(obj, ptr, sz, ty)            SWIG_JSC_ConvertPacked(context, obj, ptr, sz, ty)
 #define SWIG_NewMemberObj(ptr, sz, type)                SWIG_JSC_NewPackedObj(context, ptr, sz, type)
+
+
+/* ---------------------------------------------------------------------------
+ * Support for IN/OUTPUT typemaps (see Lib/typemaps/inoutlist.swg)
+ *
+ * ---------------------------------------------------------------------------*/
+
+unsigned int SWIGJSC_ArrayLength(JSContextRef context, JSObjectRef arr) {
+  static JSStringRef LENGTH = 0;
+  JSValueRef exception = NULL;
+  JSValueRef js_length;
+  double length;
+
+  if (LENGTH == 0) {
+    LENGTH = JSStringCreateWithUTF8CString("length");
+  }
+
+  js_length = JSObjectGetProperty(context, arr, LENGTH, &exception);
+  if (exception == 0 && JSValueIsNumber(context, js_length)) {
+    length = JSValueToNumber(context, js_length, 0);
+    return (unsigned int) length;
+  } else {
+    return 0;
+  }
+}
+
+SWIGRUNTIME
+JSValueRef SWIGJSC_AppendOutput(JSContextRef context, JSValueRef value, JSValueRef obj) {
+  JSObjectRef arr;
+  unsigned int length;
+
+  if (JSValueIsUndefined(context, value)) {
+    arr = JSObjectMakeArray(context, 0, 0, 0);
+  } else {
+    arr = JSValueToObject(context, value, 0);
+  }
+
+  length = SWIGJSC_ArrayLength(context, arr);
+  JSObjectSetPropertyAtIndex(context, arr, length, obj, 0);
+}

Lib/javascript/jsc/javascripttypemaps.swg

@@ -35,7 +35,7 @@
 #define VOID_Object                     JSValueMakeUndefined(context)
 
 /* append output */
-#define SWIG_AppendOutput(result, obj)
+#define SWIG_AppendOutput(result, obj) SWIGJSC_AppendOutput(context, result, obj)
 
 /* set constant */
 #define SWIG_SetConstant(name, obj)

Lib/javascript/jsc/typemaps.i

@@ -0,0 +1,148 @@
+/* -----------------------------------------------------------------------------
+ * typemaps.i
+ *
+ * Pointer handling
+ * These mappings provide support for input/output arguments and common
+ * uses for C/C++ pointers.
+ * ----------------------------------------------------------------------------- */
+
+// INPUT typemaps.
+// These remap a C pointer to be an "INPUT" value which is passed by value
+// instead of reference.
+
+/*
+The following methods can be applied to turn a pointer into a simple
+"input" value.  That is, instead of passing a pointer to an object,
+you would use a real value instead.
+
+         int            *INPUT
+         short          *INPUT
+         long           *INPUT
+   long long      *INPUT
+         unsigned int   *INPUT
+         unsigned short *INPUT
+         unsigned long  *INPUT
+         unsigned long long *INPUT
+         unsigned char  *INPUT
+         bool           *INPUT
+         float          *INPUT
+         double         *INPUT
+
+To use these, suppose you had a C function like this :
+
+        double fadd(double *a, double *b) {
+               return *a+*b;
+        }
+
+You could wrap it with SWIG as follows :
+
+        %include <typemaps.i>
+        double fadd(double *INPUT, double *INPUT);
+
+or you can use the %apply directive :
+
+        %include <typemaps.i>
+        %apply double *INPUT { double *a, double *b };
+        double fadd(double *a, double *b);
+
+*/
+
+// OUTPUT typemaps.   These typemaps are used for parameters that
+// are output only.   The output value is appended to the result as
+// a list element.
+
+/*
+The following methods can be applied to turn a pointer into an "output"
+value.  When calling a function, no input value would be given for
+a parameter, but an output value would be returned.  In the case of
+multiple output values, they are returned in the form of a Python tuple.
+
+         int            *OUTPUT
+         short          *OUTPUT
+         long           *OUTPUT
+         long long      *OUTPUT
+         unsigned int   *OUTPUT
+         unsigned short *OUTPUT
+         unsigned long  *OUTPUT
+         unsigned long long *OUTPUT
+         unsigned char  *OUTPUT
+         bool           *OUTPUT
+         float          *OUTPUT
+         double         *OUTPUT
+
+For example, suppose you were trying to wrap the modf() function in the
+C math library which splits x into integral and fractional parts (and
+returns the integer part in one of its parameters).K:
+
+        double modf(double x, double *ip);
+
+You could wrap it with SWIG as follows :
+
+        %include <typemaps.i>
+        double modf(double x, double *OUTPUT);
+
+or you can use the %apply directive :
+
+        %include <typemaps.i>
+        %apply double *OUTPUT { double *ip };
+        double modf(double x, double *ip);
+
+The Python output of the function would be a tuple containing both
+output values.
+
+*/
+
+// INOUT
+// Mappings for an argument that is both an input and output
+// parameter
+
+/*
+The following methods can be applied to make a function parameter both
+an input and output value.  This combines the behavior of both the
+"INPUT" and "OUTPUT" methods described earlier.  Output values are
+returned in the form of a Python tuple.
+
+         int            *INOUT
+         short          *INOUT
+         long           *INOUT
+         long long      *INOUT
+         unsigned int   *INOUT
+         unsigned short *INOUT
+         unsigned long  *INOUT
+         unsigned long long *INOUT
+         unsigned char  *INOUT
+         bool           *INOUT
+         float          *INOUT
+         double         *INOUT
+
+For example, suppose you were trying to wrap the following function :
+
+        void neg(double *x) {
+             *x = -(*x);
+        }
+
+You could wrap it with SWIG as follows :
+
+        %include <typemaps.i>
+        void neg(double *INOUT);
+
+or you can use the %apply directive :
+
+        %include <typemaps.i>
+        %apply double *INOUT { double *x };
+        void neg(double *x);
+
+Unlike C, this mapping does not directly modify the input value (since
+this makes no sense in Python).  Rather, the modified input value shows
+up as the return value of the function.  Thus, to apply this function
+to a Python variable you might do this :
+
+       x = neg(x)
+
+Note : previous versions of SWIG used the symbol 'BOTH' to mark
+input/output arguments.   This is still supported, but will be slowly
+phased out in future releases.
+
+*/
+
+%include <typemaps/typemaps.swg>