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/*jshint globalstrict:true*/
/*global angular:false*/
'use strict';
var isDefined = angular.isDefined,
isFunction = angular.isFunction,
isString = angular.isString,
isObject = angular.isObject,
isArray = angular.isArray,
forEach = angular.forEach,
extend = angular.extend,
copy = angular.copy;
function inherit(parent, extra) {
return extend(new (extend(function() {}, { prototype: parent }))(), extra);
}
function merge(dst) {
forEach(arguments, function(obj) {
if (obj !== dst) {
forEach(obj, function(value, key) {
if (!dst.hasOwnProperty(key)) dst[key] = value;
});
}
});
return dst;
}
/**
* Finds the common ancestor path between two states.
*
* @param {Object} first The first state.
* @param {Object} second The second state.
* @return {Array} Returns an array of state names in descending order, not including the root.
*/
function ancestors(first, second) {
var path = [];
for (var n in first.path) {
if (first.path[n] !== second.path[n]) break;
path.push(first.path[n]);
}
return path;
}
/**
* IE8-safe wrapper for `Object.keys()`.
*
* @param {Object} object A JavaScript object.
* @return {Array} Returns the keys of the object as an array.
*/
function objectKeys(object) {
if (Object.keys) {
return Object.keys(object);
}
var result = [];
forEach(object, function(val, key) {
result.push(key);
});
return result;
}
/**
* IE8-safe wrapper for `Array.prototype.indexOf()`.
*
* @param {Array} array A JavaScript array.
* @param {*} value A value to search the array for.
* @return {Number} Returns the array index value of `value`, or `-1` if not present.
*/
function indexOf(array, value) {
if (Array.prototype.indexOf) {
return array.indexOf(value, Number(arguments[2]) || 0);
}
var len = array.length >>> 0, from = Number(arguments[2]) || 0;
from = (from < 0) ? Math.ceil(from) : Math.floor(from);
if (from < 0) from += len;
for (; from < len; from++) {
if (from in array && array[from] === value) return from;
}
return -1;
}
/**
* Merges a set of parameters with all parameters inherited between the common parents of the
* current state and a given destination state.
*
* @param {Object} currentParams The value of the current state parameters ($stateParams).
* @param {Object} newParams The set of parameters which will be composited with inherited params.
* @param {Object} $current Internal definition of object representing the current state.
* @param {Object} $to Internal definition of object representing state to transition to.
*/
function inheritParams(currentParams, newParams, $current, $to) {
var parents = ancestors($current, $to), parentParams, inherited = {}, inheritList = [];
for (var i in parents) {
if (!parents[i].params) continue;
parentParams = objectKeys(parents[i].params);
if (!parentParams.length) continue;
for (var j in parentParams) {
if (indexOf(inheritList, parentParams[j]) >= 0) continue;
inheritList.push(parentParams[j]);
inherited[parentParams[j]] = currentParams[parentParams[j]];
}
}
return extend({}, inherited, newParams);
}
/**
* Performs a non-strict comparison of the subset of two objects, defined by a list of keys.
*
* @param {Object} a The first object.
* @param {Object} b The second object.
* @param {Array} keys The list of keys within each object to compare. If the list is empty or not specified,
* it defaults to the list of keys in `a`.
* @return {Boolean} Returns `true` if the keys match, otherwise `false`.
*/
function equalForKeys(a, b, keys) {
if (!keys) {
keys = [];
for (var n in a) keys.push(n); // Used instead of Object.keys() for IE8 compatibility
}
for (var i=0; i<keys.length; i++) {
var k = keys[i];
if (a[k] != b[k]) return false; // Not '===', values aren't necessarily normalized
}
return true;
}
/**
* Returns the subset of an object, based on a list of keys.
*
* @param {Array} keys
* @param {Object} values
* @return {Boolean} Returns a subset of `values`.
*/
function filterByKeys(keys, values) {
var filtered = {};
forEach(keys, function (name) {
filtered[name] = values[name];
});
return filtered;
}
// like _.indexBy
// when you know that your index values will be unique, or you want last-one-in to win
function indexBy(array, propName) {
var result = {};
forEach(array, function(item) {
result[item[propName]] = item;
});
return result;
}
// extracted from underscore.js
// Return a copy of the object only containing the whitelisted properties.
function pick(obj) {
var copy = {};
var keys = Array.prototype.concat.apply(Array.prototype, Array.prototype.slice.call(arguments, 1));
forEach(keys, function(key) {
if (key in obj) copy[key] = obj[key];
});
return copy;
}
// extracted from underscore.js
// Return a copy of the object omitting the blacklisted properties.
function omit(obj) {
var copy = {};
var keys = Array.prototype.concat.apply(Array.prototype, Array.prototype.slice.call(arguments, 1));
for (var key in obj) {
if (indexOf(keys, key) == -1) copy[key] = obj[key];
}
return copy;
}
function pluck(collection, key) {
var result = isArray(collection) ? [] : {};
forEach(collection, function(val, i) {
result[i] = isFunction(key) ? key(val) : val[key];
});
return result;
}
function filter(collection, callback) {
var array = isArray(collection);
var result = array ? [] : {};
forEach(collection, function(val, i) {
if (callback(val, i)) {
result[array ? result.length : i] = val;
}
});
return result;
}
function map(collection, callback) {
var result = isArray(collection) ? [] : {};
forEach(collection, function(val, i) {
result[i] = callback(val, i);
});
return result;
}
/**
* @ngdoc overview
* @name ui.router.util
*
* @description
* # ui.router.util sub-module
*
* This m
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