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<?php |
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namespace Riimu\Kit\PHPEncoder\Encoder; |
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/** |
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* Encoder for float values. |
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* @author Riikka Kalliomäki <[email protected]> |
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* @copyright Copyright (c) 2014-2017 Riikka Kalliomäki |
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* @license http://opensource.org/licenses/mit-license.php MIT License |
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*/ |
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class FloatEncoder implements Encoder |
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{ |
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/** The maximum value that can be accurately represented by a float */ |
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const FLOAT_MAX = 9007199254740992.0; |
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/** @var array Default values for options in the encoder */ |
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private static $defaultOptions = [ |
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'float.integers' => false, |
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'float.precision' => 17, |
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'float.export' => false, |
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]; |
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public function getDefaultOptions() |
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{ |
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return self::$defaultOptions; |
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} |
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public function supports($value) |
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{ |
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return is_float($value); |
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} |
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public function encode($value, $depth, array $options, callable $encode) |
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{ |
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if (is_nan($value)) { |
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return 'NAN'; |
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} elseif (is_infinite($value)) { |
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return $value < 0 ? '-INF' : 'INF'; |
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} |
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return $this->encodeNumber($value, $options, $encode); |
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} |
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/** |
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* Encodes the number as a PHP number representation. |
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* @param float $float The number to encode |
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* @param array $options The float encoding options |
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* @param callable $encode Callback used to encode values |
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* @return string The PHP code representation for the number |
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*/ |
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private function encodeNumber($float, array $options, callable $encode) |
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{ |
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if ($this->isInteger($float, $options['float.integers'])) { |
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return $this->encodeInteger($float, $encode); |
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} elseif ($float === 0.0) { |
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return '0.0'; |
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} elseif ($options['float.export']) { |
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return var_export((float) $float, true); |
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} |
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return $this->encodeFloat($float, $this->determinePrecision($options)); |
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} |
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/** |
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* Tells if the number can be encoded as an integer. |
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* @param float $float The number to test |
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* @param bool|string $allowIntegers Whether integers should be allowed |
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* @return bool True if the number can be encoded as an integer, false if not |
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*/ |
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private function isInteger($float, $allowIntegers) |
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{ |
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if (!$allowIntegers || round($float) !== $float) { |
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return false; |
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} elseif (abs($float) < self::FLOAT_MAX) { |
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return true; |
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} |
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return $allowIntegers === 'all'; |
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} |
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/** |
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* Encodes the given float as an integer. |
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* @param float $float The number to encode |
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* @param callable $encode Callback used to encode values |
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* @return string The PHP code representation for the number |
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*/ |
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private function encodeInteger($float, callable $encode) |
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{ |
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$minimum = defined('PHP_INT_MIN') ? PHP_INT_MIN : ~PHP_INT_MAX; |
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if ($float >= $minimum && $float <= PHP_INT_MAX) { |
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return $encode((int) $float); |
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} |
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return number_format($float, 0, '.', ''); |
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} |
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/** |
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* Determines the float precision based on the options. |
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* @param array $options The float encoding options |
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* @return int The precision used to encode floats |
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*/ |
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private function determinePrecision($options) |
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{ |
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$precision = $options['float.precision']; |
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if ($precision === false) { |
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$precision = defined('HHVM_VERSION') ? 17 : ini_get('serialize_precision'); |
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} |
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return max(1, (int) $precision); |
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} |
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/** |
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* Encodes the number using a floating point representation. |
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* @param float $float The number to encode |
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* @param int $precision The maximum precision of encoded floats |
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* @return string The PHP code representation for the number |
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*/ |
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private function encodeFloat($float, $precision) |
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{ |
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$log = (int) floor(log(abs($float), 10)); |
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if ($log > -5 && abs($float) < self::FLOAT_MAX && abs($log) < $precision) { |
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return $this->formatFloat($float, $precision - $log - 1); |
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} |
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// Deal with overflow that results from rounding |
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$log += (int) (round(abs($float) / 10 ** $log, $precision - 1) / 10); |
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$string = $this->formatFloat($float / 10 ** $log, $precision - 1); |
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return sprintf('%sE%+d', $string, $log); |
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} |
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/** |
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* Formats the number as a decimal number. |
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* @param float $float The number to format |
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* @param int $digits The maximum number of decimal digits |
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* @return string The number formatted as a decimal number |
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*/ |
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private function formatFloat($float, $digits) |
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{ |
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$digits = max((int) $digits, 1); |
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$string = rtrim(number_format($float, $digits, '.', ''), '0'); |
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return substr($string, -1) === '.' ? $string . '0' : $string; |
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} |
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} |
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Riimu /
Kit-PHPEncoder
