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88 lines
3.9 KiB
88 lines
3.9 KiB
'use strict'; |
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var DESCRIPTORS = require('../internals/descriptors'); |
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var global = require('../internals/global'); |
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var uncurryThis = require('../internals/function-uncurry-this'); |
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var isForced = require('../internals/is-forced'); |
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var defineBuiltIn = require('../internals/define-built-in'); |
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var hasOwn = require('../internals/has-own-property'); |
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var inheritIfRequired = require('../internals/inherit-if-required'); |
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var isPrototypeOf = require('../internals/object-is-prototype-of'); |
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var isSymbol = require('../internals/is-symbol'); |
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var toPrimitive = require('../internals/to-primitive'); |
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var fails = require('../internals/fails'); |
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var getOwnPropertyNames = require('../internals/object-get-own-property-names').f; |
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var getOwnPropertyDescriptor = require('../internals/object-get-own-property-descriptor').f; |
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var defineProperty = require('../internals/object-define-property').f; |
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var thisNumberValue = require('../internals/this-number-value'); |
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var trim = require('../internals/string-trim').trim; |
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var NUMBER = 'Number'; |
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var NativeNumber = global[NUMBER]; |
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var NumberPrototype = NativeNumber.prototype; |
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var TypeError = global.TypeError; |
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var arraySlice = uncurryThis(''.slice); |
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var charCodeAt = uncurryThis(''.charCodeAt); |
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// `ToNumeric` abstract operation |
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// https://tc39.es/ecma262/#sec-tonumeric |
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var toNumeric = function (value) { |
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var primValue = toPrimitive(value, 'number'); |
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return typeof primValue == 'bigint' ? primValue : toNumber(primValue); |
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}; |
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// `ToNumber` abstract operation |
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// https://tc39.es/ecma262/#sec-tonumber |
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var toNumber = function (argument) { |
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var it = toPrimitive(argument, 'number'); |
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var first, third, radix, maxCode, digits, length, index, code; |
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if (isSymbol(it)) throw TypeError('Cannot convert a Symbol value to a number'); |
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if (typeof it == 'string' && it.length > 2) { |
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it = trim(it); |
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first = charCodeAt(it, 0); |
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if (first === 43 || first === 45) { |
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third = charCodeAt(it, 2); |
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if (third === 88 || third === 120) return NaN; // Number('+0x1') should be NaN, old V8 fix |
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} else if (first === 48) { |
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switch (charCodeAt(it, 1)) { |
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case 66: case 98: radix = 2; maxCode = 49; break; // fast equal of /^0b[01]+$/i |
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case 79: case 111: radix = 8; maxCode = 55; break; // fast equal of /^0o[0-7]+$/i |
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default: return +it; |
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} |
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digits = arraySlice(it, 2); |
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length = digits.length; |
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for (index = 0; index < length; index++) { |
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code = charCodeAt(digits, index); |
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// parseInt parses a string to a first unavailable symbol |
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// but ToNumber should return NaN if a string contains unavailable symbols |
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if (code < 48 || code > maxCode) return NaN; |
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} return parseInt(digits, radix); |
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} |
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} return +it; |
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}; |
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// `Number` constructor |
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// https://tc39.es/ecma262/#sec-number-constructor |
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if (isForced(NUMBER, !NativeNumber(' 0o1') || !NativeNumber('0b1') || NativeNumber('+0x1'))) { |
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var NumberWrapper = function Number(value) { |
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var n = arguments.length < 1 ? 0 : NativeNumber(toNumeric(value)); |
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var dummy = this; |
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// check on 1..constructor(foo) case |
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return isPrototypeOf(NumberPrototype, dummy) && fails(function () { thisNumberValue(dummy); }) |
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? inheritIfRequired(Object(n), dummy, NumberWrapper) : n; |
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}; |
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for (var keys = DESCRIPTORS ? getOwnPropertyNames(NativeNumber) : ( |
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// ES3: |
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'MAX_VALUE,MIN_VALUE,NaN,NEGATIVE_INFINITY,POSITIVE_INFINITY,' + |
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// ES2015 (in case, if modules with ES2015 Number statics required before): |
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'EPSILON,MAX_SAFE_INTEGER,MIN_SAFE_INTEGER,isFinite,isInteger,isNaN,isSafeInteger,parseFloat,parseInt,' + |
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// ESNext |
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'fromString,range' |
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).split(','), j = 0, key; keys.length > j; j++) { |
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if (hasOwn(NativeNumber, key = keys[j]) && !hasOwn(NumberWrapper, key)) { |
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defineProperty(NumberWrapper, key, getOwnPropertyDescriptor(NativeNumber, key)); |
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} |
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} |
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NumberWrapper.prototype = NumberPrototype; |
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NumberPrototype.constructor = NumberWrapper; |
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defineBuiltIn(global, NUMBER, NumberWrapper, { constructor: true }); |
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}
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