Support clr.GetClrType() - as in IronPython (pythonnet#433)

* Support clr.GetClrType() - as in IronPython

Implements pythonnet#432

* Tests for clr.GetClrType()

* clr.GetClrType test: ensure bad type raises ArgumentException

* clr.GetClrType - added xml doc comment, updated AUTHORS.md and CHANGELOG.md

* Simplified implementation of clr.GetClrType (taken from IronPython)

AUTHORS.md

@@ -32,6 +32,7 @@
 -   Sam Winstanley ([@swinstanley](https://github.com/swinstanley))
 -   Sean Freitag ([@cowboygneox](https://github.com/cowboygneox))
 -   Serge Weinstock ([@sweinst](https://github.com/sweinst))
+-   Ville M. Vainio ([@vivainio](https://github.com/vivainio))
 -   Virgil Dupras ([@hsoft](https://github.com/hsoft))
 -   Wenguang Yang ([@yagweb](https://github.com/yagweb))
 -   Xavier Dupré ([@sdpython](https://github.com/sdpython))

CHANGELOG.md

@@ -8,7 +8,7 @@ This document follows the conventions laid out in [Keep a CHANGELOG][].
 ## [unreleased][]
 
 ### Added
-
+-   Added clr.GetClrType (#432)(#433)
 -   Added `Foo` feature
 
 ### Changed

src/runtime/moduleobject.cs

@@ -403,6 +403,23 @@ public static Assembly AddReference(string name)
             return assembly;
         }
 
+        /// <summary>
+        /// Get a Type instance for a class object.
+        /// clr.GetClrType(IComparable) gives you the Type for IComparable,
+        /// that you can e.g. perform reflection on. Similar to typeof(IComparable) in C#
+        /// or clr.GetClrType(IComparable) in IronPython.
+        /// 
+        /// </summary>
+        /// <param name="type"></param>
+        /// <returns>The Type object</returns>
+
+        [ModuleFunction]
+        [ForbidPythonThreads]
+        public static Type GetClrType(Type type)
+        {
+            return type;
+        }
+
         [ModuleFunction]
         [ForbidPythonThreads]
         public static string FindAssembly(string name)

src/tests/test_module.py

@@ -352,6 +352,26 @@ def test_clr_add_reference():
     with pytest.raises(FileNotFoundException):
         AddReference("somethingtotallysilly")
 
+def test_clr_get_clr_type():
+    """Test clr.GetClrType()."""
+    from clr import GetClrType
+    import System
+    from System import IComparable
+    from System import ArgumentException
+    assert GetClrType(System.String).FullName == "System.String"
+    comparable = GetClrType(IComparable)
+    assert comparable.FullName == "System.IComparable"
+    assert comparable.IsInterface
+    assert GetClrType(int).FullName == "System.Int32"
+    assert GetClrType(str).FullName == "System.String"
+    assert GetClrType(float).FullName == "System.Double"
+    dblarr = System.Array[System.Double]
+    assert GetClrType(dblarr).FullName == "System.Double[]"
+
+    with pytest.raises(TypeError):
+        GetClrType(1)
+    with pytest.raises(TypeError):
+        GetClrType("thiswillfail")
 
 def test_assembly_load_thread_safety():
     from Python.Test import ModuleTest