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LibWeb: Add implementation of Node.compareDocumentPosition()
While looking into getting Duck Duck Go loading further in the Browser, I noticed that it was complaining about the missing method Node.compareDocumentPosition. This change implements as much of the DOM spec as possible with the current implementation of the DOM to date. The implementation is validated by new tests in the Node.js.
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@ -454,6 +454,43 @@ void Node::remove_all_children(bool suppress_observers)
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child->remove(suppress_observers);
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}
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// https://dom.spec.whatwg.org/#dom-node-comparedocumentposition
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u16 Node::compare_document_position(RefPtr<Node> other)
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{
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enum Position : u16 {
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DOCUMENT_POSITION_EQUAL = 0,
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DOCUMENT_POSITION_DISCONNECTED = 1,
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DOCUMENT_POSITION_PRECEDING = 2,
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DOCUMENT_POSITION_FOLLOWING = 4,
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DOCUMENT_POSITION_CONTAINS = 8,
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DOCUMENT_POSITION_CONTAINED_BY = 16,
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DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC = 32,
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};
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if (this == other)
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return DOCUMENT_POSITION_EQUAL;
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Node* node1 = other.ptr();
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Node* node2 = this;
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// FIXME: Once LibWeb supports attribute nodes fix to follow the specification.
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VERIFY(node1->type() != NodeType::ATTRIBUTE_NODE && node2->type() != NodeType::ATTRIBUTE_NODE);
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if ((node1 == nullptr || node2 == nullptr) || (node1->root() != node2->root()))
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return DOCUMENT_POSITION_DISCONNECTED | DOCUMENT_POSITION_IMPLEMENTATION_SPECIFIC | (node1 > node2 ? DOCUMENT_POSITION_PRECEDING : DOCUMENT_POSITION_FOLLOWING);
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if (node1->is_ancestor_of(*node2))
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return DOCUMENT_POSITION_CONTAINS | DOCUMENT_POSITION_PRECEDING;
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if (node2->is_ancestor_of(*node1))
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return DOCUMENT_POSITION_CONTAINED_BY | DOCUMENT_POSITION_FOLLOWING;
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if (node1->is_before(*node2))
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return DOCUMENT_POSITION_PRECEDING;
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else
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return DOCUMENT_POSITION_FOLLOWING;
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}
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// https://dom.spec.whatwg.org/#concept-tree-host-including-inclusive-ancestor
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bool Node::is_host_including_inclusive_ancestor_of(const Node& other) const
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{
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