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<?php

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namespace AmpProject\Dom;

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use DOMAttr;

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/**

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* Dump an element with its attributes.

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* This is meant for quick identification of an element and does not dump the child element or other inner content

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* from that element.

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* @package ampproject/amp-toolbox

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final class ElementDump

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{

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/**

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* Element to dump.

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* @var Element

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private $element;

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/**

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* Maximum length to truncate attributes and textContent to.

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* Defaults to 120.

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* @var int

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private $truncate;

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/**

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* Instantiate an ElementDump object.

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* The object is meant to be cast to a string to do its magic.

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* @param Element $element Element to dump.

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* @param int $truncate Optional. Maximum length to truncate attributes and textContent to. Defaults to 120.

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public function __construct(Element $element, $truncate = 120)

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{

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$this->element = $element;

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$this->truncate = $truncate;

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}

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/**

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* Dump the provided element into a string.

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* @return string Dump of the element.

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public function __toString()

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{

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$attributes = $this->maybeTruncate(

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array_reduce(

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iterator_to_array($this->element->attributes, true),

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static function ($text, DOMAttr $attribute) {

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return $text . " {$attribute->nodeName}=\"{$attribute->value}\"";

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)

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);

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$textContent = $this->maybeTruncate($this->element->textContent);

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return sprintf(

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'<%1$s%2$s>%3$s</%1$s>',

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$this->element->tagName,

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$attributes,

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$textContent

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);

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}

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/**

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* Truncate the provided text if needed.

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* @param string $text Text to truncate.

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* @return string Potentially truncated text.

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private function maybeTruncate($text)

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{

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if ($this->truncate <= 0) {

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return $text;

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}

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// Not checking for both mb_* functions, as we assume that if one mb_* function exists, the extension is

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// available and all mb_* functions will exist.

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if (function_exists('mb_strlen')) {

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if (mb_strlen($text) > $this->truncate) {

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return mb_substr($text, 0, $this->truncate - 1) . '…';

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}

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} elseif (strlen($text) > $this->truncate) {

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// Fall back to regular string functions, knowing that this might potentially miscalculate and/or split

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// multi-byte chars. We do so as we assume a site with special character encoding needs will have the

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// multi-byte extension loaded anyway.

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return substr($text, 0, $this->truncate - 1) . '…';

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}

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return $text;

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}

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}

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