| (class DomTestHelper { |
| /** |
| * @param {Array<!Node>} nodes |
| * @param {string} attrValue |
| * @return {?Node} |
| */ |
| static searchNodesByAttributeValue(nodes, attrValue) { |
| for (let node of nodes) { |
| if (node.attributes && (node.attributes.indexOf(attrValue) !== -1)) |
| return node; |
| |
| if (node.children) { |
| const childSearch = DomTestHelper.searchNodesByAttributeValue(node.children, attrValue); |
| if (childSearch) |
| return childSearch; |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Queries DevTools protocol for document to find body node |
| * |
| * @return {?Node} |
| */ |
| static async findBodyNode(dp) { |
| /** Query for depth = 3 in conventional files (specifically our resource files) |
| * #document |
| * - #doctype |
| * - html |
| * - head |
| * - body |
| */ |
| const documentMessage = await dp.DOM.getDocument({ depth: 2 }); |
| /** Do a breadth-first traversal to find a node where nodeName === 'BODY' */ |
| const toVisit = [documentMessage.result.root]; |
| while (toVisit.length > 0) { |
| const toCheck = toVisit.shift(); |
| if (toCheck.nodeName === 'BODY') |
| return toCheck; |
| |
| if (toCheck.children) |
| toVisit.push(...toCheck.children); |
| |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Searches an array of nodes and returns the first which has a |
| * matching id. |
| * |
| * @param {Array<!Node>} nodes |
| * @param {number} nodeId |
| * @return {?Node} |
| */ |
| static searchNodesByNodeId(nodes, nodeId) { |
| return nodes.find(node => node.nodeId === nodeId) || null; |
| } |
| |
| /** |
| * Performs a depth first search of an array of nodes and their |
| * children for the first iframe contentDocument |
| * |
| * @param {Array<!Node>} nodes |
| * @return {?Node} |
| */ |
| static searchNodesForContentDocument(nodes) { |
| for (let node of nodes) { |
| if (node.contentDocument) |
| return node.contentDocument; |
| |
| if (node.children) { |
| const childSearch = DomTestHelper.searchNodesForContentDocument(node.children); |
| if (childSearch) |
| return childSearch; |
| } |
| } |
| |
| return null; |
| } |
| }) |
