Implement C API function 'PyMapping_GetItemString'.

Author: fangerer

graalpython/com.oracle.graal.python.cext/src/abstract.c

@@ -247,12 +247,19 @@ PyObject* PySequence_Tuple(PyObject *v) {
 	return to_sulong(result);
 }
 
-PyObject *
-PySequence_Fast(PyObject *v, const char *m)
-{
+PyObject * PySequence_Fast(PyObject *v, const char *m) {
 	void* result = polyglot_invoke(PY_TRUFFLE_CEXT, "PySequence_Fast", to_java(v), polyglot_from_string(m, "ascii"), ERROR_MARKER);
 	if(result == ERROR_MARKER) {
 		return NULL;
 	}
 	return to_sulong(result);
 }
+
+PyObject * PyMapping_GetItemString(PyObject *o, const char *key) {
+	void* result = polyglot_invoke(PY_TRUFFLE_CEXT, "PyObject_GetItem", to_java(o), polyglot_from_string(key, "utf-8"), ERROR_MARKER);
+	if(result == ERROR_MARKER) {
+		return NULL;
+	}
+	return to_sulong(result);
+}
+

graalpython/com.oracle.graal.python.test/src/tests/cpyext/test_abstract.py

@@ -691,22 +691,19 @@ def compile_module(self, name):
         cmpfunc=unhandled_error_compare
     )
 
-#     test_PyMapping_GetItemString = CPyExtFunction(
-#         _reference_fast,
-#         lambda: (
-#             (tuple(), "should not be an error"),
-#             ((1,2,3), "should not be an error"),
-#             ((None,), "should not be an error"),
-#             ([], "should not be an error"),
-#             #(['a','b','c'],"should not be an error"),
-#             #({'a','b','c'}, "should not be an error"),
-#             #({'a': 0,'b': 1,'c': 2}, "should not be an error"),
-#             #(None, "None cannot be a sequence"),
-#             #(0, "int cannot be a sequence"),
-#         ),
-#         resultspec="O",
-#         argspec='Os',
-#         arguments=["PyObject* sequence", "char* error_msg"],
-#         cmpfunc=unhandled_error_compare
-#     )
+    test_PyMapping_GetItemString = CPyExtFunction(
+        lambda args: args[0][args[1]],
+        lambda: (
+            (tuple(), "hello"),
+            ((1,2,3), "1"),
+            (['a','b','c'],"nothing"),
+            ({'a','b','c'}, "a"),
+            ({'a': 0,'b': 1,'c': 2}, "nothing"),
+            ({'a': 0,'b': 1,'c': 2}, "c"),
+        ),
+        resultspec="O",
+        argspec='Os',
+        arguments=["PyObject* mapping", "char* keyStr"],
+        cmpfunc=unhandled_error_compare
+    )