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<?php |
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/** |
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* Phossa Project |
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* |
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* PHP version 5.4 |
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* |
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* @category Library |
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* @package Phossa2\Shared |
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* @copyright Copyright (c) 2016 phossa.com |
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* @license http://mit-license.org/ MIT License |
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* @link http://www.phossa.com/ |
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*/ |
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/*# declare(strict_types=1); */ |
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namespace Phossa2\Shared\Reference; |
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use Phossa2\Shared\Message\Message; |
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use Phossa2\Shared\Exception\RuntimeException; |
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/** |
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* ReferenceTrait |
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* |
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* Provides reference & dereference methods |
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* |
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* @package Phossa2\Shared |
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* @author Hong Zhang <[email protected]> |
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* @see ReferenceInterface |
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* @version 2.0.4 |
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* @since 2.0.4 added |
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* @since 2.0.6 added reference cache support |
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*/ |
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trait ReferenceTrait |
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{ |
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/** |
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* refernece start chars |
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* |
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* @var string |
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* @access protected |
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*/ |
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protected $ref_start = '${'; |
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/** |
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* reference ending chars |
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* |
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* @var string |
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* @access protected |
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*/ |
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protected $ref_end = '}'; |
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/** |
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* cached pattern to match |
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* |
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* @var string |
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* @access protected |
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*/ |
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protected $ref_pattern = '~(\$\{((?:(?!\$\{|\}).)+?)\})~'; |
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/** |
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* cached references |
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* |
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* @var array |
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* @access protected |
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* @since 2.0.6 |
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*/ |
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protected $ref_cache = []; |
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/** |
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* {@inheritDoc} |
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*/ |
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public function setReference( |
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/*# string */ $start, |
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/*# string */ $end |
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) { |
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$this->ref_start = $start; |
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$this->ref_end = $end; |
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// build pattern |
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$s = preg_quote($start); |
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$e = preg_quote($end); |
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$this->ref_pattern = sprintf( |
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"~(%s((?:(?!%s|%s).)+?)%s)~", $s, $s, $e, $e |
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); |
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return $this; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function hasReference( |
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/*# string */ $subject, |
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array &$matched |
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)/*# : bool */ { |
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if (is_string($subject) && |
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false !== strpos($subject, $this->ref_start) && |
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preg_match($this->ref_pattern, $subject, $matched) |
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) { |
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return true; |
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} |
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return false; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function deReference(/*# string */ $subject) |
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{ |
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$loop = 0; |
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$matched = []; |
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while ($this->hasReference($subject, $matched)) { |
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// check loop |
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$this->checkReferenceLoop($loop++, $matched[2]); |
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// resolve the reference |
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$val = $this->resolveReference($matched[2]); |
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// resolved to another string |
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if (is_string($val)) { |
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$subject = str_replace($matched[1], $val, $subject); |
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// resolved to array, object, null etc. |
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} else { |
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return $this->checkValue($val, $subject, $matched[1]); |
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} |
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} |
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return $subject; |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function deReferenceArray(&$dataArray) |
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{ |
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if (is_string($dataArray)) { |
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$dataArray = $this->deReference($dataArray); |
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} |
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if (!is_array($dataArray)) { |
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return; |
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} |
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foreach ($dataArray as &$data) { |
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$this->dereferenceArray($data); |
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} |
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} |
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/** |
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* Check dereferenced value |
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* |
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* @param mixed $value |
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* @param string $subject |
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* @param string $reference |
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* @return mixed |
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* @throws RuntimeException if $subject malformed, like mix string & array |
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* @access protected |
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*/ |
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protected function checkValue( |
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$value, |
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/*# string */ $subject, |
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/*# string */ $reference |
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) { |
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// unknown reference found, leave it alone |
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if (is_null($value)) { |
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// exception thrown in resolveUnknown() already if wanted to |
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return $subject; |
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// malformed partial match |
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} elseif ($subject != $reference) { |
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throw new RuntimeException( |
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Message::get(Message::MSG_REF_MALFORMED, $reference), |
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Message::MSG_REF_MALFORMED |
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); |
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// full match, array or object |
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} else { |
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return $value; |
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} |
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} |
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/** |
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* Resolve the reference $name |
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* |
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* @param string $name |
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* @return mixed |
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* @throws RuntimeException if reference unknown |
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* @access protected |
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* @since 2.0.6 added cache support |
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*/ |
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protected function resolveReference(/*# string */ $name) |
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{ |
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try { |
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// try reference cache first |
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if (isset($this->ref_cache[$name])) { |
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return $this->ref_cache[$name]; |
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} |
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// get referenced value |
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$val = $this->getReference($name); |
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// unknown ref found |
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if (is_null($val)) { |
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$val = $this->resolveUnknown($name); |
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} |
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// cache deref result |
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$this->ref_cache[$name] = $val; |
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return $val; |
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} catch (\Exception $e) { |
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throw new RuntimeException($e->getMessage(), $e->getCode()); |
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} |
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} |
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/** |
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* Throw exception if looped |
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* |
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* @param int $loop loop counter |
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* @param string $name reference name |
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* @throws RuntimeException if loop found |
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* @access public |
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*/ |
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protected function checkReferenceLoop( |
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/*# int */ $loop, |
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/*# string */ $name |
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) { |
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if ($loop > 20) { |
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throw new RuntimeException( |
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Message::get(Message::MSG_REF_LOOP, $name), |
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Message::MSG_REF_LOOP |
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); |
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} |
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} |
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/** |
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* Clear reference cache |
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* |
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* @return $this |
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* @access protected |
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* @since 2.0.6 added |
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*/ |
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protected function clearReferenceCache() |
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{ |
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$this->ref_cache = []; |
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return $this; |
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} |
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/** |
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* For unknown reference $name, normally returns NULL |
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* |
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* @param string $name |
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* @return mixed |
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* @throws \Exception if implementor WANTS TO !! |
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* @access protected |
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*/ |
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abstract protected function resolveUnknown(/*# string */ $name); |
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/** |
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* The real resolving method. return NULL for unknown reference |
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* |
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* @param string $name |
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* @return mixed |
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* @access protected |
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*/ |
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abstract protected function getReference(/*# string */ $name); |
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} |
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phossa2 /
shared
