mirror of https://github.com/jkjoy/sunpeiwen.git
70 lines
2.8 KiB
JavaScript
70 lines
2.8 KiB
JavaScript
'use strict';
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var global = require('./_global');
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var has = require('./_has');
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var cof = require('./_cof');
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var inheritIfRequired = require('./_inherit-if-required');
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var toPrimitive = require('./_to-primitive');
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var fails = require('./_fails');
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var gOPN = require('./_object-gopn').f;
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var gOPD = require('./_object-gopd').f;
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var dP = require('./_object-dp').f;
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var $trim = require('./_string-trim').trim;
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var NUMBER = 'Number';
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var $Number = global[NUMBER];
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var Base = $Number;
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var proto = $Number.prototype;
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// Opera ~12 has broken Object#toString
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var BROKEN_COF = cof(require('./_object-create')(proto)) == NUMBER;
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var TRIM = 'trim' in String.prototype;
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// 7.1.3 ToNumber(argument)
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var toNumber = function (argument) {
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var it = toPrimitive(argument, false);
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if (typeof it == 'string' && it.length > 2) {
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it = TRIM ? it.trim() : $trim(it, 3);
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var first = it.charCodeAt(0);
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var third, radix, maxCode;
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if (first === 43 || first === 45) {
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third = it.charCodeAt(2);
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if (third === 88 || third === 120) return NaN; // Number('+0x1') should be NaN, old V8 fix
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} else if (first === 48) {
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switch (it.charCodeAt(1)) {
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case 66: case 98: radix = 2; maxCode = 49; break; // fast equal /^0b[01]+$/i
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case 79: case 111: radix = 8; maxCode = 55; break; // fast equal /^0o[0-7]+$/i
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default: return +it;
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}
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for (var digits = it.slice(2), i = 0, l = digits.length, code; i < l; i++) {
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code = digits.charCodeAt(i);
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// parseInt parses a string to a first unavailable symbol
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// but ToNumber should return NaN if a string contains unavailable symbols
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if (code < 48 || code > maxCode) return NaN;
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} return parseInt(digits, radix);
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}
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} return +it;
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};
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if (!$Number(' 0o1') || !$Number('0b1') || $Number('+0x1')) {
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$Number = function Number(value) {
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var it = arguments.length < 1 ? 0 : value;
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var that = this;
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return that instanceof $Number
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// check on 1..constructor(foo) case
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&& (BROKEN_COF ? fails(function () { proto.valueOf.call(that); }) : cof(that) != NUMBER)
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? inheritIfRequired(new Base(toNumber(it)), that, $Number) : toNumber(it);
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};
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for (var keys = require('./_descriptors') ? gOPN(Base) : (
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// ES3:
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'MAX_VALUE,MIN_VALUE,NaN,NEGATIVE_INFINITY,POSITIVE_INFINITY,' +
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// ES6 (in case, if modules with ES6 Number statics required before):
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'EPSILON,isFinite,isInteger,isNaN,isSafeInteger,MAX_SAFE_INTEGER,' +
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'MIN_SAFE_INTEGER,parseFloat,parseInt,isInteger'
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).split(','), j = 0, key; keys.length > j; j++) {
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if (has(Base, key = keys[j]) && !has($Number, key)) {
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dP($Number, key, gOPD(Base, key));
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}
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}
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$Number.prototype = proto;
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proto.constructor = $Number;
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require('./_redefine')(global, NUMBER, $Number);
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}
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