Implements System.Decimal support

Convertes System.Decimal to decimal.decimal and vice-versa

Author: AlexCatarino

src/runtime/converter.cs

@@ -30,6 +30,7 @@ private Converter()
         private static Type flagsType;
         private static Type boolType;
         private static Type typeType;
+        private static IntPtr decimalCtor;
 
         static Converter()
         {
@@ -45,6 +46,9 @@ static Converter()
             flagsType = typeof(FlagsAttribute);
             boolType = typeof(Boolean);
             typeType = typeof(Type);
+
+            IntPtr decimalMod = Runtime.PyImport_ImportModule("decimal");
+            if (decimalMod == null) throw new PythonException();
         }
 
 
@@ -100,6 +104,9 @@ internal static IntPtr GetPythonTypeByAlias(Type op)
             if (op == boolType)
                 return Runtime.PyBoolType;
 
+            if (op == decimalType)
+                return Runtime.PyFloatType;
+
             return IntPtr.Zero;
         }
 
@@ -221,6 +228,14 @@ internal static IntPtr ToPython(object value, Type type)
                 case TypeCode.UInt64:
                     return Runtime.PyLong_FromUnsignedLongLong((ulong)value);
 
+                case TypeCode.Decimal:
+                    string d2s = ((decimal)value).ToString(nfi);
+                    IntPtr d2p = Runtime.PyString_FromString(d2s);
+                    IntPtr decimalArgs = Runtime.PyTuple_New(1);
+                    Runtime.PyTuple_SetItem(decimalArgs, 0, d2p);
+                    
+                    return Runtime.PyObject_CallObject(decimalCtor, decimalArgs);
+
                 default:
                     if (value is IEnumerable)
                     {
@@ -793,6 +808,18 @@ private static bool ToPrimitive(IntPtr value, Type obType, out object result, bo
                     Runtime.XDecref(op);
                     result = d;
                     return true;
+
+                case TypeCode.Decimal:
+                    op = Runtime.PyObject_Str(value);
+                    decimal m;
+                    string sm = Runtime.GetManagedString(op);
+                    if (!Decimal.TryParse(sm, NumberStyles.Number, nfi, out m))
+                    {
+                        goto type_error;
+                    }
+                    Runtime.XDecref(op);
+                    result = m;
+                    return true;
             }