/**
* Returns a QuantityValue representing the given amount, automatically assuming
* a level of uncertainty based on the digits given.
*
* The upper and lower bounds are determined automatically from the given
* digits by increasing resp. decreasing the least significant digit.
* E.g. "+0.01" would have upperBound "+0.02" and lowerBound "+0.01",
* while "-100" would have upperBound "-99" and lowerBound "-101".
*
* @param DecimalValue $amount The quantity
* @param string $unit The quantity's unit (use "1" for unit-less quantities)
* @param int $exponent Decimal exponent to apply
*
* @return QuantityValue
*/
private function newUncertainQuantityFromDigits(DecimalValue $amount, $unit = '1', $exponent = 0)
{
$math = new DecimalMath();
if ($amount->getSign() === '+') {
$upperBound = $math->bump($amount);
$lowerBound = $math->slump($amount);
} else {
$upperBound = $math->slump($amount);
$lowerBound = $math->bump($amount);
}
$amount = $this->decimalParser->applyDecimalExponent($amount, $exponent);
$lowerBound = $this->decimalParser->applyDecimalExponent($lowerBound, $exponent);
$upperBound = $this->decimalParser->applyDecimalExponent($upperBound, $exponent);
return new QuantityValue($amount, $unit, $upperBound, $lowerBound);
}
/**
* @dataProvider applyDecimalExponentProvider
*/
public function testApplyDecimalExponent(DecimalValue $decimal, $exponent, DecimalValue $expectedDecimal)
{
$parser = new DecimalParser();
$actualDecimal = $parser->applyDecimalExponent($decimal, $exponent);
$this->assertSame($expectedDecimal->getValue(), $actualDecimal->getValue());
}
