From 8eeffcbcd027c929e2a76accad588c61dfa2e37c Mon Sep 17 00:00:00 2001 From: dcodeIO 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) +);