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<?php |
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/** |
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* @file |
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*/ |
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namespace CultuurNet\UDB3\StringFilter; |
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use Stringy\Stringy as Stringy; |
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class TruncateStringFilter implements StringFilterInterface |
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{ |
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/** |
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* @var bool |
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*/ |
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protected $wordSafe = false; |
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/** |
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* @var int |
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*/ |
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protected $minWordSafeLength; |
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/** |
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* @var bool |
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*/ |
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protected $addEllipsis = false; |
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/** |
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* @var bool |
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*/ |
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protected $spaceBeforeEllipsis = false; |
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/** |
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* @var bool |
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*/ |
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protected $sentenceFriendly = false; |
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/** |
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* @var int |
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*/ |
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protected $maxLength; |
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/** |
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* @param int $maxLength |
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*/ |
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public function __construct($maxLength) |
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{ |
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$this->setMaxLength($maxLength); |
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} |
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/** |
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* @param int $maxLength |
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*/ |
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public function setMaxLength($maxLength) |
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{ |
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$this->maxLength = $maxLength; |
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} |
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/** |
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* @param bool $toggle |
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*/ |
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public function addEllipsis($toggle = true) |
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{ |
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$this->addEllipsis = $toggle; |
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} |
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/** |
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* @param bool $toggle |
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*/ |
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public function spaceBeforeEllipsis($toggle = true) |
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{ |
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$this->spaceBeforeEllipsis = $toggle; |
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} |
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/** |
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* @param int $minWordSafeLength |
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*/ |
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public function turnOnWordSafe($minWordSafeLength = 1) |
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{ |
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$this->wordSafe = true; |
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$this->minWordSafeLength = $minWordSafeLength; |
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} |
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/** |
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* When turned on, the filter will try not to truncate in the middle of a sentence. |
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*/ |
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public function beSentenceFriendly() |
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{ |
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$this->sentenceFriendly = true; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function filter($string) |
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{ |
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// Maximum length and minimum length to enable word-safe truncating should always be greater than zero. |
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$maxLength = max($this->maxLength, 0); |
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$minWordSafeLength = max($this->minWordSafeLength, 0); |
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// Do not attempt word-safe truncating if the maximum length is smaller than the minimum length to do |
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// word-safe truncating. |
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$wordSafe = $this->wordSafe && $maxLength >= $minWordSafeLength; |
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// Define the suffix of the truncated string. |
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$suffix = ''; |
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if ($this->addEllipsis) { |
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$ellipsis = '...'; |
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if ($this->spaceBeforeEllipsis) { |
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$ellipsis = ' ...'; |
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} |
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$suffix = Stringy::create($ellipsis, 'UTF-8'); |
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// If the ellipsis is longer or equal to the maximum length, simply truncate the ellipsis so it fits in |
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// the maximum length and return it. |
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if ($suffix->length() >= $maxLength) { |
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return (string) $suffix->truncate($maxLength); |
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} |
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} |
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$stringy = Stringy::create($string, 'UTF-8'); |
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$sentencePattern = '/(.*[.!?])(?:\\s|\\h|$|\\\u00a0).*/su'; |
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$trunc = (string) $stringy->first($maxLength); |
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$hasEndingSymbolInRange = preg_match($sentencePattern, $trunc); |
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if ($this->sentenceFriendly && $hasEndingSymbolInRange === 1) { |
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$sentenceTruncated = preg_replace($sentencePattern, "$1".$suffix, $trunc); |
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$truncated = Stringy::create($sentenceTruncated, 'UTF-8'); |
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} elseif ($wordSafe) { |
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$truncated = $stringy->safeTruncate($maxLength, $suffix); |
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} else { |
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$truncated = $stringy->truncate($maxLength, $suffix); |
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} |
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if ($this->addEllipsis) { |
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// Make sure the string does not end in more than 3 dots. The pattern looks for a sequence of |
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// 4 or more ("{4,}") dots ("(\\.)") at the end of the string ("$"). |
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$pattern = '(\\.){4,}$'; |
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$truncated = $truncated->regexReplace($pattern, $suffix); |
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} |
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return (string) $truncated; |
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} |
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} |
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If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check:
If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue.