54 lines
1.4 KiB
TypeScript
54 lines
1.4 KiB
TypeScript
import {
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findNodeOfType,
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ParseTree,
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replaceNodesMatchingAsync,
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} from "$sb/lib/tree.ts";
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import { YAML } from "$sb/plugos-syscall/mod.ts";
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export type Attribute = {
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name: string;
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value: string;
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};
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/**
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* Extracts attributes from a tree, optionally cleaning them out of the tree.
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* @param tree tree to extract attributes from
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* @param clean whether or not to clean out the attributes from the tree
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* @returns mapping from attribute name to attribute value
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*/
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export async function extractAttributes(
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tree: ParseTree,
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clean: boolean,
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): Promise<Record<string, any>> {
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const attributes: Record<string, any> = {};
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await replaceNodesMatchingAsync(tree, async (n) => {
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if (n.type === "ListItem") {
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// Find top-level only, no nested lists
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return n;
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}
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if (n.type === "Attribute") {
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const nameNode = findNodeOfType(n, "AttributeName");
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const valueNode = findNodeOfType(n, "AttributeValue");
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if (nameNode && valueNode) {
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const name = nameNode.children![0].text!;
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const val = valueNode.children![0].text!;
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try {
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attributes[name] = await YAML.parse(val);
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} catch (e: any) {
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console.error("Error parsing attribute value as YAML", val, e);
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}
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}
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// Remove from tree
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if (clean) {
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return null;
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} else {
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return n;
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}
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}
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// Go on...
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return undefined;
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});
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return attributes;
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}
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