| 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); |
| } |
| }; |
