Convenient access to repr() on the Javascript side

src/js2python.cpp

 #include "js2python.hpp"
 
 #include "jsproxy.hpp"
+#include "pyproxy.hpp"
 
 using emscripten::val;
 
@@ -20,7 +21,14 @@ PyObject *jsToPython(val x) {
     Py_INCREF(Py_None);
     return Py_None;
   } else {
-    return JsProxy_cnew(x);
+    try {
+      Py py_x = x.as<Py>();
+      PyObject *pypy_x = py_x.x;
+      Py_INCREF(pypy_x);
+      return pypy_x;
+    } catch (...) {
+      return JsProxy_cnew(x);
+    }
   }
 }
 

src/main.cpp

@@ -21,9 +21,24 @@ using emscripten::val;
 // Conversions
 
 
+val repr(val v) {
+  PyObject *pyv = jsToPython(v);
+  PyObject *r = PyObject_Repr(pyv);
+  if (r == NULL) {
+    return pythonExcToJs();
+  }
+  PyObject_Print(r, 0, 0);
+  val result = pythonToJs(r);
+  Py_DECREF(r);
+  Py_DECREF(pyv);
+  return result;
+}
+
+
 EMSCRIPTEN_BINDINGS(python) {
   emscripten::function("runPython", &runPython);
   emscripten::function("pyimport", &pyimport);
+  emscripten::function("repr", &repr);
   emscripten::class_<Py>("Py")
     .function<val>("call", &Py::call)
     .function<val>("getattr", &Py::getattr)

src/pyproxy.hpp

@@ -10,9 +10,9 @@
 #include "python2js.hpp"
 
 class Py {
+public:
   PyObject *x;
 
-public:
   Py(PyObject *obj);
   Py(const Py& o);
   ~Py();