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<?php namespace AmpProject\Dom; use AmpProject\Str; use DOMAttr; /** * Dump an element with its attributes. * * This is meant for quick identification of an element and does not dump the child element or other inner content * from that element. * * @package ampproject/amp-toolbox */ final class ElementDump { /** * Element to dump. * * @var Element */ private $element; /** * Maximum length to truncate attributes and textContent to. * * Defaults to 120. * * @var int */ private $truncate; /** * Instantiate an ElementDump object. * * The object is meant to be cast to a string to do its magic. * * @param Element $element Element to dump. * @param int $truncate Optional. Maximum length to truncate attributes and textContent to. Defaults to 120. */ public function __construct(Element $element, $truncate = 120) { $this->element = $element; $this->truncate = $truncate; } /** * Dump the provided element into a string. * * @return string Dump of the element. */ public function __toString() { $attributes = $this->maybeTruncate( array_reduce( iterator_to_array($this->element->attributes, true), static function ($text, DOMAttr $attribute) { return $text . " {$attribute->nodeName}=\"{$attribute->value}\""; }, '' ) ); $textContent = $this->maybeTruncate($this->element->textContent); return sprintf( '<%1$s%2$s>%3$s</%1$s>', $this->element->tagName, $attributes, $textContent ); } /** * Truncate the provided text if needed. * * @param string $text Text to truncate. * @return string Potentially truncated text. */ private function maybeTruncate($text) { if ($this->truncate <= 0) { return $text; } if (Str::length($text) > $this->truncate) { return Str::substring($text, 0, $this->truncate - 1) . '…'; } return $text; } }
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