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<?php |
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declare(strict_types = 1); |
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namespace Sop\X501\StringPrep; |
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/** |
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* Implement Internationalized String Preparation as specified by RFC 4518. |
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* |
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* @see https://tools.ietf.org/html/rfc4518 |
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*/ |
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class StringPreparer |
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{ |
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const STEP_TRANSCODE = 1; |
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const STEP_MAP = 2; |
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const STEP_NORMALIZE = 3; |
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const STEP_PROHIBIT = 4; |
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const STEP_CHECK_BIDI = 5; |
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const STEP_INSIGNIFICANT_CHARS = 6; |
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/** |
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* Preparation steps. |
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* |
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* @var PrepareStep[] |
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*/ |
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protected $_steps; |
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/** |
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* Constructor. |
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* |
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* @param PrepareStep[] $steps Preparation steps to apply |
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*/ |
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protected function __construct(array $steps) |
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{ |
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$this->_steps = $steps; |
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} |
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/** |
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* Get default instance for given string type. |
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* |
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* @param int $string_type ASN.1 string type tag. |
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* |
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* @return self |
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*/ |
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public static function forStringType(int $string_type): self |
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{ |
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$steps = [ |
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self::STEP_TRANSCODE => new TranscodeStep($string_type), |
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self::STEP_MAP => new MapStep(), |
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self::STEP_NORMALIZE => new NormalizeStep(), |
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self::STEP_PROHIBIT => new ProhibitStep(), |
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self::STEP_CHECK_BIDI => new CheckBidiStep(), |
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// @todo Vary by string type |
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self::STEP_INSIGNIFICANT_CHARS => new InsignificantNonSubstringSpaceStep(), |
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]; |
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return new self($steps); |
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} |
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/** |
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* Get self with case folding set. |
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* |
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* @param bool $fold True to apply case folding |
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* |
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* @return self |
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*/ |
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public function withCaseFolding(bool $fold): self |
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{ |
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$obj = clone $this; |
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$obj->_steps[self::STEP_MAP] = new MapStep($fold); |
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return $obj; |
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} |
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/** |
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* Prepare string. |
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* |
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* @param string $string |
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* |
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* @return string |
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*/ |
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public function prepare(string $string): string |
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{ |
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foreach ($this->_steps as $step) { |
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$string = $step->apply($string); |
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} |
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return $string; |
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} |
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} |
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sop /
x501
