66 lines
2.6 KiB
JavaScript
66 lines
2.6 KiB
JavaScript
'use strict';
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var $ = require('./$')
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, global = require('./$.global')
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, has = require('./$.has')
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, cof = require('./$.cof')
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, toPrimitive = require('./$.to-primitive')
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, fails = require('./$.fails')
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, $trim = require('./$.string-trim').trim
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, NUMBER = 'Number'
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, $Number = global[NUMBER]
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, Base = $Number
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, proto = $Number.prototype
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// Opera ~12 has broken Object#toString
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, BROKEN_COF = cof($.create(proto)) == NUMBER
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, 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() : $trim(it, 3);
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var first = it.charCodeAt(0)
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, third, radix, maxCode;
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if(first === 43 || first === 45){
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third = it.charCodeAt(2);
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if(third === 88 || third === 120)return NaN; // Number('+0x1') should be NaN, old V8 fix
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} else if(first === 48){
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switch(it.charCodeAt(1)){
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case 66 : case 98 : radix = 2; maxCode = 49; break; // fast equal /^0b[01]+$/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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, that = this;
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return that instanceof $Number
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// check on 1..constructor(foo) case
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&& (BROKEN_COF ? fails(function(){ proto.valueOf.call(that); }) : cof(that) != NUMBER)
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? new Base(toNumber(it)) : toNumber(it);
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};
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$.each.call(require('./$.descriptors') ? $.getNames(Base) : (
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// ES3:
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'MAX_VALUE,MIN_VALUE,NaN,NEGATIVE_INFINITY,POSITIVE_INFINITY,' +
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// ES6 (in case, if modules with ES6 Number statics required before):
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'EPSILON,isFinite,isInteger,isNaN,isSafeInteger,MAX_SAFE_INTEGER,' +
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'MIN_SAFE_INTEGER,parseFloat,parseInt,isInteger'
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).split(','), function(key){
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if(has(Base, key) && !has($Number, key)){
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$.setDesc($Number, key, $.getDesc(Base, key));
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}
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});
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$Number.prototype = proto;
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proto.constructor = $Number;
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require('./$.redefine')(global, NUMBER, $Number);
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} |