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<?php |
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namespace Subreality\Dilmun\Anshar\Http\UriParts; |
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/** |
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* Class Scheme |
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* @package Subreality\Dilmun\Anshar\Http\UriParts |
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*/ |
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class Scheme extends AbstractUriPart |
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{ |
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protected static $compositions = array(); |
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/** @noinspection PhpMissingParentConstructorInspection */ |
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/** |
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* Scheme constructor. Accepts a string representing a URI scheme. Construction will throw an exception if the |
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* scheme is either not a string or does not conform to the RFC3986 URI scheme specification. |
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* |
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* Construction also results in the scheme string being converted to lowercase per RFC3986. |
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* |
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* scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) |
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* |
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* @see https://tools.ietf.org/html/rfc3986#section-3.1 |
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* @see https://tools.ietf.org/html/rfc3986#appendix-A |
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* |
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* @throws \InvalidArgumentException |
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* |
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* @param string $scheme A string representing a URI scheme |
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*/ |
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public function __construct($scheme) |
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{ |
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$this->compileValidPattern(); |
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if (!is_string($scheme)) { |
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throw new \InvalidArgumentException("Scheme must be a string"); |
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} elseif (!$this->isValid($scheme)) { |
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throw new \InvalidArgumentException("Scheme must conform to RFC3986 specification"); |
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} |
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$this->data = strtolower($scheme); |
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} |
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/** |
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* Returns a string representation of the scheme formatted so that it can be compiled into a complete URI string |
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* per the Uri object's string specification. |
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* |
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* If the scheme is empty, toUriString returns an empty string; if the scheme is not empty, toUriString returns the |
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* scheme suffixed with a colon. |
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* |
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* @see Uri::__toString |
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* |
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* @return string A string representation of the scheme formatted for a complete URI string |
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*/ |
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public function toUriString() |
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{ |
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$uri_scheme = parent::toUriString(); //returns data string |
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if (!empty($this->data)) { |
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$uri_scheme .= ":"; |
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} |
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return $uri_scheme; |
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} |
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/** |
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* Compiles a regexp pattern based on predefined patterns that define allowed characters for a scheme. |
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*/ |
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protected static function compileValidPattern() |
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{ |
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self::$part_pattern = '[a-z][\w\+\-\.]*'; |
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self::$valid_pattern = '/^$|^[a-z][\w\+\-\.]*$/i'; //the beginning '^$|' part allows for empty schemes |
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} |
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} |
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twistofreality /
dilmun
