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'use strict';
var $export = require('./_export')
, toInteger = require('./_to-integer')
, aNumberValue = require('./_a-number-value')
, repeat = require('./_string-repeat')
, $toFixed = 1..toFixed
, floor = Math.floor
, data = [0, 0, 0, 0, 0, 0]
, ERROR = 'Number.toFixed: incorrect invocation!'
, ZERO = '0';
var multiply = function(n, c){
var i = -1
, c2 = c;
while(++i < 6){
c2 += n * data[i];
data[i] = c2 % 1e7;
c2 = floor(c2 / 1e7);
}
};
var divide = function(n){
var i = 6
, c = 0;
while(--i >= 0){
c += data[i];
data[i] = floor(c / n);
c = (c % n) * 1e7;
}
};
var numToString = function(){
var i = 6
, s = '';
while(--i >= 0){
if(s !== '' || i === 0 || data[i] !== 0){
var t = String(data[i]);
s = s === '' ? t : s + repeat.call(ZERO, 7 - t.length) + t;
}
} return s;
};
var pow = function(x, n, acc){
return n === 0 ? acc : n % 2 === 1 ? pow(x, n - 1, acc * x) : pow(x * x, n / 2, acc);
};
var log = function(x){
var n = 0
, x2 = x;
while(x2 >= 4096){
n += 12;
x2 /= 4096;
}
while(x2 >= 2){
n += 1;
x2 /= 2;
} return n;
};
$export($export.P + $export.F * (!!$toFixed && (
0.00008.toFixed(3) !== '0.000' ||
0.9.toFixed(0) !== '1' ||
1.255.toFixed(2) !== '1.25' ||
1000000000000000128..toFixed(0) !== '1000000000000000128'
) || !require('./_fails')(function(){
// V8 ~ Android 4.3-
$toFixed.call({});
})), 'Number', {
toFixed: function toFixed(fractionDigits){
var x = aNumberValue(this, ERROR)
, f = toInteger(fractionDigits)
, s = ''
, m = ZERO
, e, z, j, k;
if(f < 0 || f > 20)throw RangeError(ERROR);
if(x != x)return 'NaN';
if(x <= -1e21 || x >= 1e21)return String(x);
if(x < 0){
s = '-';
x = -x;
}
if(x > 1e-21){
e = log(x * pow(2, 69, 1)) - 69;
z = e < 0 ? x * pow(2, -e, 1) : x / pow(2, e, 1);
z *= 0x10000000000000;
e = 52 - e;
if(e > 0){
multiply(0, z);
j = f;
while(j >= 7){
multiply(1e7, 0);
j -= 7;
}
multiply(pow(10, j, 1), 0);
j = e - 1;
while(j >= 23){
divide(1 << 23);
j -= 23;
}
divide(1 << j);
multiply(1, 1);
divide(2);
m = numToString();
} else {
multiply(0, z);
multiply(1 << -e, 0);
m = numToString() + repeat.call(ZERO, f);
}
}
if(f > 0){
k = m.length;
m = s + (k <= f ? '0.' + repeat.call(ZERO, f - k) + m : m.slice(0, k - f) + '.' + m.slice(k - f));
} else {
m = s + m;
} return m;
}
});
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