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120 lines
3.5 KiB
JavaScript
120 lines
3.5 KiB
JavaScript
/**
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* lodash (Custom Build) <https://lodash.com/>
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* Build: `lodash modularize exports="npm" -o ./`
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* Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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var assignInWith = require('lodash.assigninwith'),
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rest = require('lodash.rest');
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/**
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* A faster alternative to `Function#apply`, this function invokes `func`
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* with the `this` binding of `thisArg` and the arguments of `args`.
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*
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* @private
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* @param {Function} func The function to invoke.
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* @param {*} thisArg The `this` binding of `func`.
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* @param {Array} args The arguments to invoke `func` with.
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* @returns {*} Returns the result of `func`.
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*/
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function apply(func, thisArg, args) {
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var length = args.length;
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switch (length) {
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case 0: return func.call(thisArg);
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case 1: return func.call(thisArg, args[0]);
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case 2: return func.call(thisArg, args[0], args[1]);
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case 3: return func.call(thisArg, args[0], args[1], args[2]);
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}
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return func.apply(thisArg, args);
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}
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/**
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* Used by `_.defaults` to customize its `_.assignIn` use.
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*
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* @private
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* @param {*} objValue The destination value.
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* @param {*} srcValue The source value.
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* @param {string} key The key of the property to assign.
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* @param {Object} object The parent object of `objValue`.
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* @returns {*} Returns the value to assign.
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*/
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function assignInDefaults(objValue, srcValue, key, object) {
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if (objValue === undefined ||
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(eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
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return srcValue;
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}
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return objValue;
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}
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/**
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* Performs a
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* [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)
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* comparison between two values to determine if they are equivalent.
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*
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* @static
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* @memberOf _
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* @since 4.0.0
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* @category Lang
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* @param {*} value The value to compare.
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* @param {*} other The other value to compare.
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* @returns {boolean} Returns `true` if the values are equivalent, else `false`.
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* @example
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*
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* var object = { 'user': 'fred' };
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* var other = { 'user': 'fred' };
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*
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* _.eq(object, object);
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* // => true
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*
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* _.eq(object, other);
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* // => false
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*
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* _.eq('a', 'a');
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* // => true
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*
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* _.eq('a', Object('a'));
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* // => false
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*
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* _.eq(NaN, NaN);
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* // => true
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*/
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function eq(value, other) {
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return value === other || (value !== value && other !== other);
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}
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/**
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* Assigns own and inherited enumerable string keyed properties of source
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* objects to the destination object for all destination properties that
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* resolve to `undefined`. Source objects are applied from left to right.
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* Once a property is set, additional values of the same property are ignored.
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*
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* **Note:** This method mutates `object`.
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*
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* @static
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* @since 0.1.0
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* @memberOf _
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* @category Object
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* @param {Object} object The destination object.
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* @param {...Object} [sources] The source objects.
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* @returns {Object} Returns `object`.
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* @see _.defaultsDeep
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* @example
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*
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* _.defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' });
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* // => { 'user': 'barney', 'age': 36 }
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*/
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var defaults = rest(function(args) {
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args.push(undefined, assignInDefaults);
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return apply(assignInWith, undefined, args);
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});
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module.exports = defaults;
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