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<?php

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namespace AmpProject;

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use AmpProject\Dom\Document;

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use AmpProject\Dom\Element;

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use DOMNode;

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/**

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* Helper functionality to deal with AMP dev-mode.

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* @link https://github.com/ampproject/amphtml/issues/20974

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* @package ampproject/amp-toolbox

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final class DevMode

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{

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/**

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* Attribute name for AMP dev mode.

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* @var string

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const DEV_MODE_ATTRIBUTE = 'data-ampdevmode';

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/**

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* Check whether the provided document is in dev mode.

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* @param Document $document Document for which to check whether dev mode is active.

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* @return bool Whether the document is in dev mode.

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public static function isActiveForDocument(Document $document)

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{

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return $document->documentElement->hasAttribute(self::DEV_MODE_ATTRIBUTE);

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}

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/**

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* Check whether a node is exempt from validation during dev mode.

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* @param DOMNode $node Node to check.

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* @return bool Whether the node should be exempt during dev mode.

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public static function hasExemptionForNode(DOMNode $node)

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{

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if (! $node instanceof Element) {

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return false;

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}

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$document = self::getDocument($node);

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if ($node === $document->documentElement) {

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return $document->hasInitialAmpDevMode();

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}

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return $node->hasAttribute(self::DEV_MODE_ATTRIBUTE);

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}

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/**

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* Check whether a certain node should be exempt from validation.

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* @param DOMNode $node Node to check.

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* @return bool Whether the node should be exempt from validation.

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public static function isExemptFromValidation(DOMNode $node)

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{

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$document = self::getDocument($node);

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return self::isActiveForDocument($document) && self::hasExemptionForNode($node);

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}

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/**

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* Get the document from the specified node.

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* @param DOMNode $node

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* @return Document

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private static function getDocument(DOMNode $node)

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{

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$document = $node->ownerDocument;

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if (! $document instanceof Document) {

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$document = Document::fromNode($node);

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}

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return $document;

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}

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}

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