Current File : /var/www/html/node_modules/domutils/lib/esm/traversal.js
import { isTag, hasChildren, } from "domhandler";
/**
* Get a node's children.
*
* @category Traversal
* @param elem Node to get the children of.
* @returns `elem`'s children, or an empty array.
*/
export function getChildren(elem) {
return hasChildren(elem) ? elem.children : [];
}
/**
* Get a node's parent.
*
* @category Traversal
* @param elem Node to get the parent of.
* @returns `elem`'s parent node.
*/
export function getParent(elem) {
return elem.parent || null;
}
/**
* Gets an elements siblings, including the element itself.
*
* Attempts to get the children through the element's parent first. If we don't
* have a parent (the element is a root node), we walk the element's `prev` &
* `next` to get all remaining nodes.
*
* @category Traversal
* @param elem Element to get the siblings of.
* @returns `elem`'s siblings.
*/
export function getSiblings(elem) {
const parent = getParent(elem);
if (parent != null)
return getChildren(parent);
const siblings = [elem];
let { prev, next } = elem;
while (prev != null) {
siblings.unshift(prev);
({ prev } = prev);
}
while (next != null) {
siblings.push(next);
({ next } = next);
}
return siblings;
}
/**
* Gets an attribute from an element.
*
* @category Traversal
* @param elem Element to check.
* @param name Attribute name to retrieve.
* @returns The element's attribute value, or `undefined`.
*/
export function getAttributeValue(elem, name) {
var _a;
return (_a = elem.attribs) === null || _a === void 0 ? void 0 : _a[name];
}
/**
* Checks whether an element has an attribute.
*
* @category Traversal
* @param elem Element to check.
* @param name Attribute name to look for.
* @returns Returns whether `elem` has the attribute `name`.
*/
export function hasAttrib(elem, name) {
return (elem.attribs != null &&
Object.prototype.hasOwnProperty.call(elem.attribs, name) &&
elem.attribs[name] != null);
}
/**
* Get the tag name of an element.
*
* @category Traversal
* @param elem The element to get the name for.
* @returns The tag name of `elem`.
*/
export function getName(elem) {
return elem.name;
}
/**
* Returns the next element sibling of a node.
*
* @category Traversal
* @param elem The element to get the next sibling of.
* @returns `elem`'s next sibling that is a tag.
*/
export function nextElementSibling(elem) {
let { next } = elem;
while (next !== null && !isTag(next))
({ next } = next);
return next;
}
/**
* Returns the previous element sibling of a node.
*
* @category Traversal
* @param elem The element to get the previous sibling of.
* @returns `elem`'s previous sibling that is a tag.
*/
export function prevElementSibling(elem) {
let { prev } = elem;
while (prev !== null && !isTag(prev))
({ prev } = prev);
return prev;
}
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