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<?php |
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namespace Riimu\Kit\PHPEncoder\Encoder; |
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/** |
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* Encoder for string 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 StringEncoder implements Encoder |
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{ |
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/** @var array Default values for options in the encoder */ |
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private static $defaultOptions = [ |
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'string.escape' => true, |
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'string.binary' => false, |
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'string.utf8' => false, |
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]; |
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public function getDefaultOptions() |
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{ |
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return self::$defaultOptions; |
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} |
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public function supports($value) |
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{ |
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return is_string($value); |
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} |
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public function encode($value, $depth, array $options, callable $encode) |
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{ |
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$value = (string) $value; |
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if (preg_match('/[^\x20-\x7E]/', $value)) { |
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if ($this->isBinaryString($value, $options)) { |
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return $this->encodeBinaryString($value); |
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} elseif ($options['string.escape']) { |
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return $this->getDoubleQuotedString($value, $options); |
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} |
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} |
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return $this->getSingleQuotedString($value); |
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} |
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/** |
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* Tells if the string is not a valid UTF-8 string. |
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* @param string $string The string to test |
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* @param array $options The string encoding options |
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* @return bool True if the string is not valid UTF-8 and false if it is |
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*/ |
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private function isBinaryString($string, $options) |
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{ |
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if (!$options['string.binary']) { |
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return false; |
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} |
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// UTF-8 validity test without mbstring extension |
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$pattern = |
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'/^(?> |
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[\x00-\x7F]+ # ASCII |
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| [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte |
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| \xE0[\xA0-\xBF][\x80-\xBF] # excluding over longs |
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| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} # straight 3-byte |
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| \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates |
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| \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3 |
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| [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15 |
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| \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16 |
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)*$/x'; |
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return !preg_match($pattern, $string); |
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} |
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/** |
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* Encodes the given string into base 64 encoded format. |
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* @param string $string The string to encode |
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* @return string A base 64 PHP code representation for the string |
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*/ |
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private function encodeBinaryString($string) |
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{ |
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return sprintf("base64_decode('%s')", base64_encode($string)); |
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} |
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/** |
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* Returns the string wrapped in single quotes and escape appropriately. |
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* @param string $string String to wrap |
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* @return string The string wrapped in single quotes |
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*/ |
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private function getSingleQuotedString($string) |
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{ |
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return sprintf("'%s'", strtr($string, ["'" => "\\'", '\\' => '\\\\'])); |
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} |
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/** |
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* Returns the string wrapped in double quotes and all but print characters escaped. |
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* @param string $string String to wrap and escape |
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* @param array $options The string encoding options |
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* @return string The string wrapped in double quotes and escape correctly |
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*/ |
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private function getDoubleQuotedString($string, $options) |
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{ |
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$string = strtr($string, [ |
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"\n" => '\n', |
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"\r" => '\r', |
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"\t" => '\t', |
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'$' => '\$', |
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'"' => '\"', |
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'\\' => '\\\\', |
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]); |
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if ($options['string.utf8']) { |
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$string = $this->encodeUtf8($string, $options); |
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} |
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$hexFormat = function ($matches) use ($options) { |
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return sprintf($options['hex.capitalize'] ? '\x%02X' : '\x%02x', ord($matches[0])); |
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}; |
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return sprintf('"%s"', preg_replace_callback('/[^\x20-\x7E]/', $hexFormat, $string)); |
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} |
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/** |
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* Encodes all multibyte UTF-8 characters into PHP7 string encoding. |
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* @param string $string The string to encoder |
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* @param array $options The string encoding options |
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* @return string The string with all the multibyte characters encoded |
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*/ |
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private function encodeUtf8($string, $options) |
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{ |
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$pattern = |
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'/ [\xC2-\xDF][\x80-\xBF] |
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| \xE0[\xA0-\xBF][\x80-\xBF] |
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| [\xE1-\xEC\xEE\xEF][\x80-\xBF]{2} |
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| \xED[\x80-\x9F][\x80-\xBF] |
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| \xF0[\x90-\xBF][\x80-\xBF]{2} |
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| [\xF1-\xF3][\x80-\xBF]{3} |
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2 |
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| \xF4[\x80-\x8F][\x80-\xBF]{2}/x'; |
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return preg_replace_callback($pattern, function ($match) use ($options) { |
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return sprintf($options['hex.capitalize'] ? '\u{%X}' : '\u{%x}', $this->getCodePoint($match[0])); |
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}, $string); |
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} |
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/** |
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* Returns the unicode code point for the given multibyte UTF-8 character. |
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* @param string $bytes The multibyte character |
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* @return int The code point for the multibyte character |
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*/ |
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private function getCodePoint($bytes) |
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{ |
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if (strlen($bytes) === 2) { |
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return ((ord($bytes[0]) & 0b11111) << 6) |
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| (ord($bytes[1]) & 0b111111); |
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} |
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3 |
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if (strlen($bytes) === 3) { |
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return ((ord($bytes[0]) & 0b1111) << 12) |
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| ((ord($bytes[1]) & 0b111111) << 6) |
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| (ord($bytes[2]) & 0b111111); |
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} |
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return ((ord($bytes[0]) & 0b111) << 18) |
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3 |
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| ((ord($bytes[1]) & 0b111111) << 12) |
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3 |
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| ((ord($bytes[2]) & 0b111111) << 6) |
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| (ord($bytes[3]) & 0b111111); |
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} |
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} |
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Riimu /
Kit-PHPEncoder
