preboot/esm2015/common/get-node-key.js

/**
 * Attempt to generate key from node position in the DOM
 */
export function getNodeKeyForPreboot(nodeContext) {
    const ancestors = [];
    const root = nodeContext.root;
    const node = nodeContext.node;
    let temp = node;
    // walk up the tree from the target node up to the root
    while (temp && temp !== root.serverNode && temp !== root.clientNode) {
        ancestors.push(temp);
        temp = temp.parentNode;
    }
    // note: if temp doesn't exist here it means root node wasn't found
    if (temp) {
        ancestors.push(temp);
    }
    // now go backwards starting from the root, appending the appName to unique
    // identify the node later..
    const name = node.nodeName || 'unknown';
    let key = name;
    const len = ancestors.length;
    for (let i = len - 1; i >= 0; i--) {
        temp = ancestors[i];
        if (temp.childNodes && i > 0) {
            for (let j = 0; j < temp.childNodes.length; j++) {
                if (temp.childNodes[j] === ancestors[i - 1]) {
                    key += '_s' + (j + 1);
                    break;
                }
            }
        }
    }
    return key;
}
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