Implemented issue: #47

jse/src/main/java/org/luaj/vm2/libs/jse/JsePlatform.java

@@ -88,6 +88,7 @@ public class JsePlatform {
 		Globals globals = new Globals();
 		globals.load(new JseBaseLib());
 		globals.load(new PackageLib());
+		globals.load(new CjsonLib());
 		globals.load(new Bit32Lib());
 		globals.load(new TableLib());
 		globals.load(new JseStringLib());

jse/src/test/java/org/luaj/vm2/FragmentsTest.java

@@ -390,6 +390,25 @@ public class FragmentsTest extends TestSuite {
 			}
 		}
 
+		public void testCjsonRequireEncodeDecode() {
+			try {
+				Globals globals = JsePlatform.standardGlobals();
+				Varargs result = globals.load(
+					"local cjson = require('cjson')\n" +
+					"local json = cjson.encode({name='lua', values={1, true, cjson.null}})\n" +
+					"local decoded = cjson.decode(json)\n" +
+					"return decoded.name, decoded.values[1], decoded.values[2], decoded.values[3] == cjson.null\n",
+					"cjson.lua").invoke();
+				assertEquals(LuaValue.valueOf("lua"), result.arg1());
+				assertEquals(LuaValue.valueOf(1), result.arg(2));
+				assertEquals(LuaValue.TRUE, result.arg(3));
+				assertEquals(LuaValue.TRUE, result.arg(4));
+			} catch (Exception e) {
+				e.printStackTrace();
+				fail(e.toString());
+			}
+		}
+
 		public void testTableMove() {
 			runFragment(
 				LuaValue.varargsOf(new LuaValue[] {