[gnode] value: Add support for NULL values

[Jasper St. Pierre <jstpierre src gnome org>]

commit b5d0a7faa6d53559a475c637d3c94fe561b057a0
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Tue Oct 14 10:19:37 2014 -0700

    value: Add support for NULL values

 src/function.cc |    3 ++-
 src/value.cc    |   13 +++++++++++--
 src/value.h     |    2 +-
 3 files changed, 14 insertions(+), 4 deletions(-)
---
diff --git a/src/function.cc b/src/function.cc
index 6e7f1b5..cfd403e 100644
--- a/src/function.cc
+++ b/src/function.cc
@@ -62,8 +62,9 @@ static Handle<Value> FunctionInvoker(const Arguments &args) {
     for (int i = 0; i < n_in_args; i++) {
         GIArgInfo *arg_info = g_callable_info_get_arg ((GICallableInfo *) info, i);
         GITypeInfo type_info;
+        bool may_be_null = g_arg_info_may_be_null (arg_info);
         g_arg_info_load_type (arg_info, &type_info);
-        V8ToGIArgument (&type_info, &in_args[i], args[i]);
+        V8ToGIArgument (&type_info, &in_args[i], args[i], may_be_null);
         g_base_info_unref ((GIBaseInfo *) arg_info);
     }
 
diff --git a/src/value.cc b/src/value.cc
index 715a0fe..5af3931 100644
--- a/src/value.cc
+++ b/src/value.cc
@@ -109,7 +109,7 @@ static GArray * V8ToGArray(GITypeInfo *type_info, v8::Handle<v8::Value> value) {
         v8::Local<v8::Value> value = array->Get (i);
         GIArgument arg;
 
-        V8ToGIArgument (elem_info, &arg, value);
+        V8ToGIArgument (elem_info, &arg, value, false);
         g_array_append_val (garray, arg);
     }
 
@@ -117,9 +117,18 @@ static GArray * V8ToGArray(GITypeInfo *type_info, v8::Handle<v8::Value> value) {
     return garray;
 }
 
-void V8ToGIArgument(GITypeInfo *type_info, GIArgument *arg, v8::Handle<v8::Value> value) {
+void V8ToGIArgument(GITypeInfo *type_info, GIArgument *arg, v8::Handle<v8::Value> value, bool may_be_null) {
     GITypeTag type_tag = g_type_info_get_tag (type_info);
 
+    if (value->IsNull ()) {
+        if (may_be_null)
+            arg->v_pointer = NULL;
+        else
+            ThrowException (v8::Exception::TypeError (v8::String::New ("Argument may not be null.")));
+
+        return;
+    }
+
     switch (type_tag) {
     case GI_TYPE_TAG_VOID:
         arg->v_pointer = NULL;
diff --git a/src/value.h b/src/value.h
index 4fd2198..48dcbb3 100644
--- a/src/value.h
+++ b/src/value.h
@@ -28,7 +28,7 @@
 namespace GNodeJS {
 
 v8::Handle<v8::Value> GIArgumentToV8(GITypeInfo *type_info, GIArgument *argument);
-void V8ToGIArgument(GITypeInfo *type_info, GIArgument *argument, v8::Handle<v8::Value> value);
+void V8ToGIArgument(GITypeInfo *type_info, GIArgument *argument, v8::Handle<v8::Value> value, bool 
may_be_null);
 void FreeGIArgument(GITypeInfo *type_info, GIArgument *argument);
 
 void V8ToGValue(GValue *gvalue, v8::Handle<v8::Value> value);