From 0b361137a27b3e8edaa94e8b8683fbe48393c971 Mon Sep 17 00:00:00 2001
From: Tony Garnock-Jones <tonygarnockjones@gmail.com>
Date: Thu, 24 Jul 2014 21:07:36 -0700
Subject: [PATCH] Reflect.formalParameters

---
 src/main.js    |  1 +
 src/reflect.js | 25 +++++++++++++++++++++++++
 2 files changed, 26 insertions(+)
 create mode 100644 src/reflect.js

diff --git a/src/main.js b/src/main.js
index bfbbad4..de240ad 100644
--- a/src/main.js
+++ b/src/main.js
@@ -4,6 +4,7 @@ module.exports.DOM = require("./dom-driver.js");
 module.exports.JQuery = require("./jquery-driver.js");
 module.exports.RoutingTableWidget = require("./routing-table-widget.js");
 module.exports.WebSocket = require("./websocket-driver.js");
+module.exports.Reflect = require("./reflect.js");
 
 module.exports.Spy = require("./spy.js").Spy;
 module.exports.WakeDetector = require("./wake-detector.js").WakeDetector;
diff --git a/src/reflect.js b/src/reflect.js
new file mode 100644
index 0000000..c444d54
--- /dev/null
+++ b/src/reflect.js
@@ -0,0 +1,25 @@
+// Reflection on function formal parameter lists.
+// This module is based on Angular's "injector" code,
+// https://github.com/angular/angular.js/blob/master/src/auto/injector.js,
+// MIT licensed, and hence:
+// Copyright (c) 2010-2014 Google, Inc. http://angularjs.org
+// Copyright (c) 2014 Tony Garnock-Jones
+
+var FN_ARGS = /^function\s*[^\(]*\(\s*([^\)]*)\)/m;
+var FN_ARG_SPLIT = /,/;
+var STRIP_COMMENTS = /((\/\/.*$)|(\/\*[\s\S]*?\*\/))/mg;
+
+function formalParameters(fn) {
+    var result = [];
+
+    var fnText = fn.toString().replace(STRIP_COMMENTS, '');
+    var argDecl = fnText.match(FN_ARGS);
+    var args = argDecl[1].split(FN_ARG_SPLIT);
+    for (var i = 0; i < args.length; i++) {
+	result.push(args[i].trim());
+    }
+
+    return result;
+}
+
+module.exports.formalParameters = formalParameters;