| 1 | export const NODE_TYPE_ROOT = Symbol("ROOT");
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| 2 | export const NODE_TYPE_CHILD = Symbol("CHILD");
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| 3 | export const createRootNode = () => {
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| 4 | return {
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| 5 | type: NODE_TYPE_ROOT,
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| 6 | children: new Map(),
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| 7 | };
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| 8 | };
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| 9 | export const createOrGetChild = (parent, label) => {
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| 10 | let child = parent.children.get(label);
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| 11 | if (child === undefined) {
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| 12 | child = {
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| 13 | type: NODE_TYPE_CHILD,
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| 14 | label,
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| 15 | children: new Map(),
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| 16 | parent,
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| 17 | };
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| 18 | parent.children.set(label, child);
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| 19 | }
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| 20 | return child;
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| 21 | };
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| 22 | |
| \ | No newline at end of file |