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<?php |
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/** |
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* File containing the {@see Mailcode_Parser_Safeguard_Placeholder_Locator_Replacer} class. |
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* |
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* @package Mailcode |
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* @subpackage Parser |
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* @see Mailcode_Parser_Safeguard_Placeholder_Locator_Replacer |
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*/ |
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declare(strict_types=1); |
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namespace Mailcode; |
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/** |
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* Used to replace a placeholder at a specific location |
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* with another text. The replacement handles inseting the |
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* new text, while shifting the positions of all other |
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* instances of the placeholder to account for the change |
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* in text length. |
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* |
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* @package Mailcode |
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* @subpackage Parser |
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* @author Sebastian Mordziol <[email protected]> |
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* |
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* @see Mailcode_Parser_Safeguard_Placeholder_Locator::replaceWith() |
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*/ |
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class Mailcode_Parser_Safeguard_Placeholder_Locator_Replacer |
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{ |
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const ERROR_PLACEHOLDER_STRING_MISSING = 63501; |
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const ERROR_COULD_NOT_FIND_PLACEHOLDER_TEXT = 63502; |
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/** |
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* @var string |
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*/ |
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private $replacementText; |
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/** |
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* @var Mailcode_Parser_Safeguard_Placeholder_Locator |
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*/ |
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private $locator; |
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/** |
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* @var Mailcode_Parser_Safeguard_Placeholder_Locator_Location |
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*/ |
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private $origin; |
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/** |
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* @var string |
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*/ |
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private $placeholderText; |
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/** |
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* @var integer |
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*/ |
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private $offset = 0; |
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/** |
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* @var string |
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*/ |
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private $subject; |
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/** |
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* @var integer |
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*/ |
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private $prefixLength = 0; |
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/** |
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* @var integer |
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*/ |
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private $placeholderLength = 0; |
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/** |
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* @var integer |
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*/ |
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private $lengthDifference = 0; |
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public function __construct(Mailcode_Parser_Safeguard_Placeholder_Locator_Location $origin, string $replacementText, string $subject) |
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{ |
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$this->replacementText = $replacementText; |
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$this->origin = $origin; |
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$this->placeholderText = $this->origin->getPlaceholder()->getReplacementText(); |
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$this->subject = $subject; |
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} |
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public function replace() : string |
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{ |
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$this->prepareCalculations(); |
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$this->replaceLocation(); |
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$this->adjustPositions(); |
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return $this->subject; |
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} |
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/** |
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* Adjusts the positions of all locations that come after |
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* this one, to account for the added string length of the |
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* placeholder that has been replaced. |
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*/ |
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private function adjustPositions() : void |
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{ |
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$locations = $this->origin->getNextAll(); |
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$offset = $this->lengthDifference; |
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foreach($locations as $location) |
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{ |
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$location->updatePositionByOffset($offset); |
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$offset += $this->lengthDifference; |
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} |
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} |
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private function prepareCalculations() : void |
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{ |
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$length = mb_strpos($this->replacementText, $this->placeholderText); |
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if($length === false) |
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{ |
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throw new Mailcode_Exception( |
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'Replacement text does not contain placeholder string.', |
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sprintf( |
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'The placeholder string [%s] is not present in the replacement text: %s', |
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$this->placeholderText, |
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$this->replacementText |
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), |
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self::ERROR_PLACEHOLDER_STRING_MISSING |
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); |
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} |
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// Find the beginning position of the placeholder in the replacement text |
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$this->prefixLength = $length; |
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$this->placeholderLength = mb_strlen($this->placeholderText); |
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// The total length that was added to the placeholder, front and back |
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$this->lengthDifference = mb_strlen($this->replacementText) - $this->placeholderLength; |
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} |
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private function replaceLocation() : void |
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{ |
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// Get the starting position, with cumulated total offset |
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$position = $this->origin->getStartPosition(); |
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// Cut the subject string so we can insert the adjusted placeholder |
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$start = mb_substr($this->subject, 0, $position); |
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$end = mb_substr($this->subject, $position + $this->placeholderLength); |
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// Rebuild the subject string from the parts |
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$this->subject = $start.$this->replacementText.$end; |
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// Add the prefix length as offset to the location, now that |
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// we have added it. This way the position of the placeholder |
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// itself stays correct. |
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$this->origin->updatePositionByOffset($this->prefixLength); |
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} |
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} |
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Mistralys /
mailcode
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