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<?php /** * Class ValidationExemption. * * @package AmpProject\AmpWP / namespace Google\Web_Stories_Dependencies\AmpProject\AmpWP; use Google\Web_Stories_Dependencies\AmpProject\Dom\Document; use Google\Web_Stories_Dependencies\AmpProject\Dom\Element; use DOMAttr; use DOMNode; /* * Helper functionality to deal with validation exemptions. * * @todo This could be made into a Service that contains a collection of nodes which were PX-verified or AMP-unvalidated. In this way, there would be no need to add attributes to DOM nodes, and non-element/attribute nodes could be marked, and it would be faster to see if there are any such exempted nodes. * * @package AmpProject\AmpWP * @since 2.2 * @internal * @see \AmpProject\DevMode / final class ValidationExemption { /* * HTML attribute to indicate one or more attributes have been verified for PX from AMP validation. * * @var string / const PX_VERIFIED_ATTRS_ATTRIBUTE = 'data-px-verified-attrs'; /* * HTML attribute to indicate an tag/element has been verified for PX. * * The difference here with `data-amp-unvalidated-tag` is that the PX-verified means that the tag will work * properly with CSS tree shaking. * * @var string / const PX_VERIFIED_TAG_ATTRIBUTE = 'data-px-verified-tag'; /* * HTML attribute to indicate one or more attributes are exempted from AMP validation. * * @var string / const AMP_UNVALIDATED_ATTRS_ATTRIBUTE = 'data-amp-unvalidated-attrs'; /* * HTML attribute to indicate an tag/element is exempted from AMP validation. * * @var string / const AMP_UNVALIDATED_TAG_ATTRIBUTE = 'data-amp-unvalidated-tag'; /* * Check whether PX is verified for node. * * This means that it is exempted from AMP validation, but it doesn't mean the PX is negatively impacted. * * @param DOMNode $node Node. * @return bool Whether node marked as being PX-verified. / public static function is_px_verified_for_node(DOMNode $node) { if ($node instanceof Element) { return $node->hasAttribute(self::PX_VERIFIED_TAG_ATTRIBUTE); } elseif ($node instanceof DOMAttr) { return self::check_for_attribute_token_list_membership($node, self::PX_VERIFIED_ATTRS_ATTRIBUTE); } return \false; } /* * Mark node as being PX-verified. * * @param DOMNode $node Node. * @return bool Whether successful. / public static function mark_node_as_px_verified(DOMNode $node) { return self::mark_node_with_exemption_attribute($node, self::PX_VERIFIED_TAG_ATTRIBUTE, self::PX_VERIFIED_ATTRS_ATTRIBUTE); } /* * Mark node as not being AMP-validated. * * @param DOMNode $node Node. * @return bool Whether successful. / public static function mark_node_as_amp_unvalidated(DOMNode $node) { return self::mark_node_with_exemption_attribute($node, self::AMP_UNVALIDATED_TAG_ATTRIBUTE, self::AMP_UNVALIDATED_ATTRS_ATTRIBUTE); } /* * Mark node with exemption attribute. * * @param DOMNode $node Node. * @param string $tag_attribute_name Tag attribute name. * @param string $attrs_attribute_name Attributes attribute name. * @return bool / private static function mark_node_with_exemption_attribute(DOMNode $node, $tag_attribute_name, $attrs_attribute_name) { if ($node instanceof Element) { if (!$node->hasAttribute($tag_attribute_name)) { if (null === $node->ownerDocument) { return \false; // @codeCoverageIgnore } $node->setAttributeNode($node->ownerDocument->createAttribute($tag_attribute_name)); } return \true; } elseif ($node instanceof DOMAttr) { $element = $node->parentNode; if (!$element instanceof Element) { return \false; // @codeCoverageIgnore } $attr_value = $element->getAttribute($attrs_attribute_name); if ($attr_value) { $attr_value .= ' ' . $node->nodeName; } else { $attr_value = $node->nodeName; } $element->setAttribute($attrs_attribute_name, $attr_value); return \true; } return \false; } /* * Check whether AMP is unvalidated for node. * * This means that it is exempted from AMP validation and it may negatively impact PX. * * @param DOMNode $node Node. * @return bool Whether node marked as being AMP-unvalidated. / public static function is_amp_unvalidated_for_node(DOMNode $node) { if ($node instanceof Element) { return $node->hasAttribute(self::AMP_UNVALIDATED_TAG_ATTRIBUTE); } elseif ($node instanceof DOMAttr) { return self::check_for_attribute_token_list_membership($node, self::AMP_UNVALIDATED_ATTRS_ATTRIBUTE); } return \false; } /* * Check whether the given attribute node is mentioned among the token list of another supplied attribute. * * @param DOMAttr $attr Attribute node to check for. * @param string $token_list_attr_name Attribute name that has the token list value. * * @return bool Whether membership is present. / private static function check_for_attribute_token_list_membership(DOMAttr $attr, $token_list_attr_name) { $element = $attr->parentNode; if (!$element instanceof Element) { return \false; // @codeCoverageIgnore } if (!$element->hasAttribute($token_list_attr_name)) { return \false; } return \in_array($attr->nodeName, \preg_split('/\\s+/', $element->getAttribute($token_list_attr_name)), \true); } /* * Check whether the provided document has nodes which are not AMP-validated. * * @param Document $document Document for which to check whether dev mode is active. * @return bool Whether the document is in dev mode. / public static function is_document_with_amp_unvalidated_nodes(Document $document) { return self::is_document_containing_attributes($document, [self::AMP_UNVALIDATED_TAG_ATTRIBUTE, self::AMP_UNVALIDATED_ATTRS_ATTRIBUTE]); } /* * Check whether the provided document has nodes which are PX-verified. * * @param Document $document Document for which to check whether dev mode is active. * @return bool Whether the document is in dev mode. / public static function is_document_with_px_verified_nodes(Document $document) { return self::is_document_containing_attributes($document, [self::PX_VERIFIED_TAG_ATTRIBUTE, self::PX_VERIFIED_ATTRS_ATTRIBUTE]); } /* * Check whether a document contains the given attribute names. * * @param Document $document Document. * @param string[] $attribute_names Attribute names. * @return bool Whether attributes exist in the document. / private static function is_document_containing_attributes(Document $document, $attribute_names) { return $document->xpath->query(\sprintf('//[%s]', \join(' or ', \array_map(static function ($attr_name) { return "@{$attr_name}"; }, $attribute_names))))->length > 0; } }

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