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<?php |
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namespace TraderInteractive\Filter; |
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use TraderInteractive\Exceptions\FilterException; |
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/** |
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* A collection of filters for floats. |
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*/ |
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final class Floats |
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{ |
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/** |
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* Filters $value to a float strictly. |
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* |
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* The return value is the float, as expected by the \TraderInteractive\Filterer class. |
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* |
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* @param mixed $value The value to filter to a float. |
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* @param bool $allowNull Set to true if NULL values are allowed. The filtered result of a NULL value is NULL. |
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* @param float $minValue The minimum acceptable value. |
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* @param float $maxValue The maximum acceptable value. |
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* @param bool $castInts Flag to cast $value to float if it is an integer. |
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* |
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* @return float|null The filtered value |
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* |
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* @throws FilterException Thrown if the given value cannot be filtered to a float. |
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*/ |
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public static function filter( |
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$value, |
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bool $allowNull = false, |
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float $minValue = null, |
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float $maxValue = null, |
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bool $castInts = false |
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) { |
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if ($allowNull === true && $value === null) { |
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return null; |
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} |
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$valueFloat = null; |
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if (is_float($value)) { |
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$valueFloat = $value; |
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} elseif (is_int($value) && $castInts) { |
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$valueFloat = (float)$value; |
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} elseif (is_string($value)) { |
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$valueFloat = self::fromString($value); |
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} else { |
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throw new FilterException('"' . var_export($value, true) . '" $value is not a string'); |
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} |
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if (is_infinite($valueFloat)) { |
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throw new FilterException("{$value} overflow"); |
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} |
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return self::ensureValueInRange($valueFloat, $minValue ?? -INF, $maxValue ?? INF); |
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} |
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private static function fromString(string $value) : float |
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{ |
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$value = strtolower(trim($value)); |
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if (!is_numeric($value)) { |
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throw new FilterException("{$value} does not pass is_numeric"); |
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} |
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//This is the only case (that we know of) where is_numeric does not return correctly cast-able float |
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if (strpos($value, 'x') !== false) { |
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throw new FilterException("{$value} is hex format"); |
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} |
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return (float)$value; |
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} |
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private static function ensureValueInRange(float $value, float $minValue, float $maxValue) : float |
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{ |
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if ($value < $minValue) { |
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throw new FilterException("{$value} is less than {$minValue}"); |
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} |
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if ($value > $maxValue) { |
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throw new FilterException("{$value} is greater than {$maxValue}"); |
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} |
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return $value; |
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} |
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} |
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traderinteractive /
filter-floats-php
