| 'use strict'; |
| var DESCRIPTORS = require('../internals/descriptors'); |
| var global = require('../internals/global'); |
| var isForced = require('../internals/is-forced'); |
| var redefine = require('../internals/redefine'); |
| var has = require('../internals/has'); |
| var classof = require('../internals/classof-raw'); |
| var inheritIfRequired = require('../internals/inherit-if-required'); |
| var toPrimitive = require('../internals/to-primitive'); |
| var fails = require('../internals/fails'); |
| var create = require('../internals/object-create'); |
| var getOwnPropertyNames = require('../internals/object-get-own-property-names').f; |
| var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f; |
| var defineProperty = require('../internals/object-define-property').f; |
| var trim = require('../internals/string-trim').trim; |
| |
| var NUMBER = 'Number'; |
| var NativeNumber = global[NUMBER]; |
| var NumberPrototype = NativeNumber.prototype; |
| |
| // Opera ~12 has broken Object#toString |
| var BROKEN_CLASSOF = classof(create(NumberPrototype)) == NUMBER; |
| |
| // `ToNumber` abstract operation |
| // https://tc39.github.io/ecma262/#sec-tonumber |
| var toNumber = function (argument) { |
| var it = toPrimitive(argument, false); |
| var first, third, radix, maxCode, digits, length, index, code; |
| if (typeof it == 'string' && it.length > 2) { |
| it = trim(it); |
| first = it.charCodeAt(0); |
| if (first === 43 || first === 45) { |
| third = it.charCodeAt(2); |
| if (third === 88 || third === 120) return NaN; // Number('+0x1') should be NaN, old V8 fix |
| } else if (first === 48) { |
| switch (it.charCodeAt(1)) { |
| case 66: case 98: radix = 2; maxCode = 49; break; // fast equal of /^0b[01]+$/i |
| case 79: case 111: radix = 8; maxCode = 55; break; // fast equal of /^0o[0-7]+$/i |
| default: return +it; |
| } |
| digits = it.slice(2); |
| length = digits.length; |
| for (index = 0; index < length; index++) { |
| code = digits.charCodeAt(index); |
| // parseInt parses a string to a first unavailable symbol |
| // but ToNumber should return NaN if a string contains unavailable symbols |
| if (code < 48 || code > maxCode) return NaN; |
| } return parseInt(digits, radix); |
| } |
| } return +it; |
| }; |
| |
| // `Number` constructor |
| // https://tc39.github.io/ecma262/#sec-number-constructor |
| if (isForced(NUMBER, !NativeNumber(' 0o1') || !NativeNumber('0b1') || NativeNumber('+0x1'))) { |
| var NumberWrapper = function Number(value) { |
| var it = arguments.length < 1 ? 0 : value; |
| var dummy = this; |
| return dummy instanceof NumberWrapper |
| // check on 1..constructor(foo) case |
| && (BROKEN_CLASSOF ? fails(function () { NumberPrototype.valueOf.call(dummy); }) : classof(dummy) != NUMBER) |
| ? inheritIfRequired(new NativeNumber(toNumber(it)), dummy, NumberWrapper) : toNumber(it); |
| }; |
| for (var keys = DESCRIPTORS ? getOwnPropertyNames(NativeNumber) : ( |
| // ES3: |
| 'MAX_VALUE,MIN_VALUE,NaN,NEGATIVE_INFINITY,POSITIVE_INFINITY,' + |
| // ES2015 (in case, if modules with ES2015 Number statics required before): |
| 'EPSILON,isFinite,isInteger,isNaN,isSafeInteger,MAX_SAFE_INTEGER,' + |
| 'MIN_SAFE_INTEGER,parseFloat,parseInt,isInteger' |
| ).split(','), j = 0, key; keys.length > j; j++) { |
| if (has(NativeNumber, key = keys[j]) && !has(NumberWrapper, key)) { |
| defineProperty(NumberWrapper, key, getOwnPropertyDescriptor(NativeNumber, key)); |
| } |
| } |
| NumberWrapper.prototype = NumberPrototype; |
| NumberPrototype.constructor = NumberWrapper; |
| redefine(global, NUMBER, NumberWrapper); |
| } |