svgo
Version:
37 lines (35 loc) • 991 B
JavaScript
export const visitSkip = Symbol();
/**
* @param {import('../types.js').XastNode} node
* @param {import('../types.js').Visitor} visitor
* @param {any=} parentNode
*/
export const visit = (node, visitor, parentNode) => {
const callbacks = visitor[node.type];
if (callbacks?.enter) {
// @ts-expect-error hard to infer
const symbol = callbacks.enter(node, parentNode);
if (symbol === visitSkip) {
return;
}
}
// visit root children
if (node.type === 'root') {
// copy children array to not lose cursor when children is spliced
for (const child of node.children) {
visit(child, visitor, node);
}
}
// visit element children if still attached to parent
if (node.type === 'element') {
if (parentNode.children.includes(node)) {
for (const child of node.children) {
visit(child, visitor, node);
}
}
}
if (callbacks?.exit) {
// @ts-expect-error hard to infer
callbacks.exit(node, parentNode);
}
};