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Filename : traversal.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.getChildren = getChildren;
exports.getParent = getParent;
exports.getSiblings = getSiblings;
exports.getAttributeValue = getAttributeValue;
exports.hasAttrib = hasAttrib;
exports.getName = getName;
exports.nextElementSibling = nextElementSibling;
exports.prevElementSibling = prevElementSibling;
var domhandler_1 = require("domhandler");
/**
 * Get a node's children.
 *
 * @category Traversal
 * @param elem Node to get the children of.
 * @returns `elem`'s children, or an empty array.
 */
function getChildren(elem) {
    return (0, domhandler_1.hasChildren)(elem) ? elem.children : [];
}
/**
 * Get a node's parent.
 *
 * @category Traversal
 * @param elem Node to get the parent of.
 * @returns `elem`'s parent node, or `null` if `elem` is a root node.
 */
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, including `elem`.
 */
function getSiblings(elem) {
    var _a, _b;
    var parent = getParent(elem);
    if (parent != null)
        return getChildren(parent);
    var siblings = [elem];
    var prev = elem.prev, next = elem.next;
    while (prev != null) {
        siblings.unshift(prev);
        (_a = prev, prev = _a.prev);
    }
    while (next != null) {
        siblings.push(next);
        (_b = next, next = _b.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`.
 */
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`.
 */
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`.
 */
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, or `null` if there is no next
 * sibling.
 */
function nextElementSibling(elem) {
    var _a;
    var next = elem.next;
    while (next !== null && !(0, domhandler_1.isTag)(next))
        (_a = next, next = _a.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, or `null` if there is no
 * previous sibling.
 */
function prevElementSibling(elem) {
    var _a;
    var prev = elem.prev;
    while (prev !== null && !(0, domhandler_1.isTag)(prev))
        (_a = prev, prev = _a.prev);
    return prev;
}
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