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import { getMagnitude } from '../utils'; import { ComputeExponentForMagnitude } from './ComputeExponentForMagnitude'; import { FormatNumericToString } from './FormatNumericToString'; /** * The abstract operation ComputeExponent computes an exponent (power of ten) by which to scale x * according to the number formatting settings. It handles cases such as 999 rounding up to 1000, * requiring a different exponent. * * NOT IN SPEC: it returns [exponent, magnitude]. */ export function ComputeExponent(numberFormat, x, _a) { var getInternalSlots = _a.getInternalSlots; if (x === 0) { return [0, 0]; } if (x < 0) { x = -x; } var magnitude = getMagnitude(x); var exponent = ComputeExponentForMagnitude(numberFormat, magnitude, { getInternalSlots: getInternalSlots, }); // Preserve more precision by doing multiplication when exponent is negative. x = exponent < 0 ? x * Math.pow(10, -exponent) : x / Math.pow(10, exponent); var formatNumberResult = FormatNumericToString(getInternalSlots(numberFormat), x); if (formatNumberResult.roundedNumber === 0) { return [exponent, magnitude]; } var newMagnitude = getMagnitude(formatNumberResult.roundedNumber); if (newMagnitude === magnitude - exponent) { return [exponent, magnitude]; } return [ ComputeExponentForMagnitude(numberFormat, magnitude + 1, { getInternalSlots: getInternalSlots, }), magnitude + 1, ]; }
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