Extension description syntax; extension instantiation, field values and calls with arguments (except strings); example of a simple extension.

String arguments support is supposed to be added in a subsequent commit.

plugins/io/init.cpp

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+/* Copyright 2015 Samsung Electronics Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdio.h>
+
+#include "init.h"
+#include "jerry.h"
+
+static void plugin_io_print_uint32 (uint32_t);
+
+#include "io-extension-description.inc.h"
+
+void
+plugin_io_init (void)
+{
+  jerry_extend_with (&jerry_extension);
+} /* plugin_io_init */
+
+/**
+ * Print an uint32 number without new-line to standard output
+ */
+static void
+plugin_io_print_uint32 (uint32_t num) /**< uint32 to print */
+{
+  printf ("%lu", num);
+} /* print_uint32 */