package.internals.math-float-round.js Maven / Gradle / Ivy

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'use strict';
var sign = require('../internals/math-sign');

var abs = Math.abs;

var EPSILON = 2.220446049250313e-16; // Number.EPSILON
var INVERSE_EPSILON = 1 / EPSILON;

var roundTiesToEven = function (n) {
  return n + INVERSE_EPSILON - INVERSE_EPSILON;
};

module.exports = function (x, FLOAT_EPSILON, FLOAT_MAX_VALUE, FLOAT_MIN_VALUE) {
  var n = +x;
  var absolute = abs(n);
  var s = sign(n);
  if (absolute < FLOAT_MIN_VALUE) return s * roundTiesToEven(absolute / FLOAT_MIN_VALUE / FLOAT_EPSILON) * FLOAT_MIN_VALUE * FLOAT_EPSILON;
  var a = (1 + FLOAT_EPSILON / EPSILON) * absolute;
  var result = a - (a - absolute);
  // eslint-disable-next-line no-self-compare -- NaN check
  if (result > FLOAT_MAX_VALUE || result !== result) return s * Infinity;
  return s * result;
};