// 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++) {
	var trimmed = args[i].trim();
	if (trimmed) { result.push(trimmed); }
    }

    return result;
}

module.exports.formalParameters = formalParameters;