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<?php |
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namespace Wambo\Catalog\Model; |
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use Wambo\Catalog\Error\SKUException; |
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/** |
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* Class SKU represents an unique identifier (stock keeping unit) for a product (e.g. "fancy-short-1") |
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* |
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* @package Wambo\Catalog\Model |
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*/ |
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class SKU |
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{ |
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/** |
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* @var string $whiteSpacePattern A regular expression that matches white-space characters |
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*/ |
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private $whiteSpacePattern = '/[\s]/'; |
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/** |
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* @var string $invalidCharactersPattern A regular expression that matches all characters that are invalid for a SKU |
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*/ |
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private $invalidCharactersPattern = '/[^a-z0-9-]/'; |
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/** |
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* @var string $uppercaseCharactersPattern A regular expression that matches uppercase characters |
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*/ |
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private $uppercaseCharactersPattern = '/[A-Z]/'; |
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/** |
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* @var string $invalidPrefixCharacters A regular expression that matches characters that cannot be used as a prefix |
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* for SKUs |
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*/ |
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private $invalidPrefixCharacters = '/^[-]/'; |
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/** |
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* @var string $invalidSuffixCharacters A regular expression that matches characters that cannot be used as a prefix |
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* for SKUs |
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*/ |
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private $invalidSuffixCharacters = '/[-]$/'; |
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/** |
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* @var int $minLength Defines the minimum length for a SKU |
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*/ |
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private $minLength = 2; |
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/** |
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* @var int $maxLength Defines the maximum length of a SKU |
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*/ |
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private $maxLength = 32; |
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/** |
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* @var string |
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*/ |
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private $sku; |
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/** |
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* Create a new SKU instance |
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* |
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* @param string $sku A unique identifier for a product (e.g. "fancy-short-1") |
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* |
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* @throws SKUException If the given $sku is invalid |
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*/ |
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public function __construct(string $sku) |
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{ |
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$this->validateSKU($sku); |
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$this->sku = $sku; |
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} |
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/** |
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* Get a string representation of the current SKU. |
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* |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return $this->sku; |
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} |
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/** |
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* Validate the given SKU |
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* |
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* @param string $sku A unique identifier for a product (e.g. "fancy-short-1") |
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* |
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* @return void |
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* |
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* @throws SKUException If the given $sku is invalid |
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*/ |
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private function validateSKU(string $sku) |
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{ |
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if (strlen($sku) == 0) { |
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throw new SKUException("A SKU cannot be empty"); |
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} |
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// check for white-space |
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$containsWhitespace = preg_match($this->whiteSpacePattern, $sku) == 1; |
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if ($containsWhitespace) { |
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throw new SKUException(sprintf("A SKU cannot contain white space characters: \"%s\"", $sku)); |
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} |
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// uppercase |
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$containsUppercaseCharacters = preg_match($this->uppercaseCharactersPattern, $sku) == 1; |
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if ($containsUppercaseCharacters) { |
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throw new SKUException(sprintf("A SKU cannot contain uppercase characters: \"%s\"", $sku)); |
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} |
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// check for invalid characters |
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$containsInvalidCharacters = preg_match($this->invalidCharactersPattern, $sku) == 1; |
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if ($containsInvalidCharacters) { |
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throw new SKUException(sprintf("The SKU \"%s\" contains invalid characters. A SKU can only contain the following characters: a-z, 0-9 and -", |
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$sku)); |
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} |
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// check prefix |
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$prefixMatches = []; |
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$prefixContainsInvalidCharacters = preg_match($this->invalidPrefixCharacters, $sku, $prefixMatches) == 1; |
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if ($prefixContainsInvalidCharacters) { |
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throw new SKUException(sprintf("A SKU cannot start with the given characters: \"%s\"", |
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implode("", $prefixMatches))); |
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} |
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// check suffix |
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$suffixMatches = []; |
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$suffixContainsInvalidCharacters = preg_match($this->invalidSuffixCharacters, $sku, $suffixMatches) == 1; |
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if ($suffixContainsInvalidCharacters) { |
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throw new SKUException(sprintf("A SKU cannot end with the given characters: \"%s\"", |
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implode("", $suffixMatches))); |
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} |
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// check minimum length |
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if (strlen($sku) < $this->minLength) { |
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throw new SKUException(sprintf("The given SKU \"%s\" is too short. The minimum length for a SKU is: %s", |
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$sku, $this->minLength)); |
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} |
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// check maximum length |
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if (strlen($sku) > $this->maxLength) { |
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throw new SKUException(sprintf("The given SKU \"%s\" is too long (%s character). The maximum length for a SKU is: %s", |
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strlen($sku), $sku, $this->maxLength)); |
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} |
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} |
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} |
wambo-co /
module-catalog
