function transform()

in kit/preprocessors/mdsvex/index.js [137:180]

• 39 lines of code
• 4 McCabe index (conditional complexity)

	function transform(tree) {
		let headings = [];
		visit(tree, "heading", (node, index, parent) => {
			const depth = node.depth;
			let title = getTitleText(node);
			let local = "";
			const match = title.match(/\[\s(.*?)\s\]$/);
			if (match && match[1]) {
				local = match[1];
				title = title.replace(match[0], "").trim();
			} else {
				local = title
					.trim()
					.toLowerCase()
					.replace(/\s+/g, "-") // Replace spaces with hyphens
					.replace(/[^\p{L}\p{N}-]+/gu, ""); // Keep letters, numbers, and hyphens only
			}
			headings = addToTree(headings, { title, local, sections: [], depth });

			// Create a svelte node (in remark grammar, the type is "html")
			const svelteNode = {
				type: "html",
				value: `<Heading title="${title.replaceAll(
					"{",
					"&#123;"
				)}" local="${local}" headingTag="h${depth}"/>`,
			};
			// Replace the old node with the new Svelte node
			parent.children[index] = svelteNode;
		});
		visit(tree, "text", onText);
		visit(tree, "html", onHtml);
		visit(tree, "blockquote", onBlockquote);

		let jsonString = JSON.stringify(headings[0]);
		if (jsonString) {
			jsonString = jsonString.replaceAll("'", "\\'");
		}

		tree.children.unshift({
			type: "html",
			value: `<script context="module">export const metadata = '${jsonString}';</script>`,
		});
	}