From 8eeffcbcd027c929e2a76accad588c61dfa2e37c Mon Sep 17 00:00:00 2001
From: dcodeIO <dcode@dcode.io>
Date: Wed, 1 Mar 2017 23:48:51 +0100
Subject: [PATCH] Other: Added a custom getters/setters example for gRPC

---
 examples/custom-get-set.js | 46 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 examples/custom-get-set.js

diff --git a/examples/custom-get-set.js b/examples/custom-get-set.js
new file mode 100644
index 000000000..17304184c
--- /dev/null
+++ b/examples/custom-get-set.js
@@ -0,0 +1,46 @@
+// this example demonstrates a way to keep field casing (as defined within .proto files)
+// while still having virtual getters and setters for the camel cased counterparts.
+
+var protobuf = require("..");
+
+var proto = "syntax=\"proto3\";\
+message MyMessage {\
+  string some_field = 1;\
+}";
+
+var root = protobuf.parse(proto, { keepCase: true }).root;
+
+function camelCase(str) {
+    return str.substring(0,1) + str.substring(1).replace(/_([a-z])(?=[a-z]|$)/g, function($0, $1) { return $1.toUpperCase(); });
+}
+
+// this function adds alternative getters and setters for the camel cased counterparts
+// to the runtime message's prototype (i.e. without having to register a custom class):
+function addVirtualCamelcaseFields(type) {
+    type.fieldsArray.forEach(function(field) {
+        var altName = camelCase(field.name);
+        if (altName !== field.name)
+            Object.defineProperty(type.ctor.prototype, altName, {
+                get: function() {
+                    return this[field.name];
+                },
+                set: function(value) {
+                    this[field.name] = value;
+                }
+            });
+    });
+}
+
+var MyMessage = root.lookup("MyMessage");
+
+addVirtualCamelcaseFields(MyMessage);
+
+var myMessage = MyMessage.create({
+    some_field /* or someField */: "hello world"
+});
+
+console.log(
+    "someField:", myMessage.someField,
+    "\nsome_field:", myMessage.some_field,
+    "\nJSON:", JSON.stringify(myMessage)
+);