Write a verbose error messages when the function arguments don't match.

This will increase the binding size, so there's an option to disable
verbose error messages. "--disable-verbose-error-messages"

Reviewed by Renato Araújo <renato.filho@openbossa.org> and Marcelo Lira <marcelo.lira@openbossa.org>

2 files changed, 39 insertions, 1 deletions

diff --git a/libshiboken/basewrapper.cpp b/libshiboken/basewrapper.cpp
index dc86fa831..05276b7fa 100644
--- a/libshiboken/basewrapper.cpp
+++ b/libshiboken/basewrapper.cpp
@@ -37,6 +37,7 @@
 #include <algorithm>
 #include "autodecref.h"
 #include "typeresolver.h"
+#include <string>
 
 namespace Shiboken
 {
@@ -365,6 +366,43 @@ PyAPI_FUNC(void) init_shiboken()
 
 } // extern "C"
 
+void setErrorAboutWrongArguments(PyObject* args, const char* funcName, const char** cppOverloads)
+{
+    std::string msg;
+    std::string params;
+    if (args) {
+        if (PyTuple_Check(args)) {
+            for (int i = 0, max = PyTuple_Size(args); i < max; ++i) {
+                if (i)
+                    params += ", ";
+                params += PyTuple_GET_ITEM(args, i)->ob_type->tp_name;
+            }
+        } else {
+            params = args->ob_type->tp_name;
+        }
+    }
+
+    if (!cppOverloads) {
+        msg = "'" + std::string(funcName) + "' called with wrong argument types: " + params;
+    } else {
+        msg = "'" + std::string(funcName) + "' called with wrong argument types:\n  ";
+        msg += funcName;
+        msg += '(';
+        msg += params;
+        msg += ")\n";
+        msg += "Supported signatures:";
+        for (int i = 0; cppOverloads[i]; ++i) {
+            msg += "\n  ";
+            msg += funcName;
+            msg += '(';
+            msg += cppOverloads[i];
+            msg += ')';
+        }
+    }
+    PyErr_SetString(PyExc_TypeError, msg.c_str());
+
+}
+
 } // namespace Shiboken
 
 
diff --git a/libshiboken/basewrapper.h b/libshiboken/basewrapper.h
index e8ea7cc1b..d64dadfca 100644
--- a/libshiboken/basewrapper.h
+++ b/libshiboken/basewrapper.h
@@ -255,8 +255,8 @@ void SbkBaseWrapper_Dealloc(PyObject* self)
 }
 
 LIBSHIBOKEN_API PyAPI_FUNC(void) SbkBaseWrapper_Dealloc_PrivateDtor(PyObject* self);
-
 LIBSHIBOKEN_API bool importModule(const char* moduleName, PyTypeObject*** cppApiPtr);
+LIBSHIBOKEN_API void setErrorAboutWrongArguments(PyObject* args, const char* funcName, const char** cppOverloads);
 
 } // namespace Shiboken