unocss-transformer-alias/dist/index.mjs

Transform alias for UnoCSS shortcuts

import { expandVariantGroup, isStaticShortcut, isString } from "@unocss/core";
//#region src/index.ts
function transformerAlias(options) {
	return {
		name: "unocss-transformer-alias",
		enforce: "pre",
		async transform(code, _, { uno }) {
			await transformAlias(code, uno, options);
		}
	};
}
async function transformAlias(code, uno, { prefix = "*", keep = "+" } = {}) {
	if (typeof keep === "string") keep = {
		prefix: keep,
		block: true
	};
	const extraRE = new RegExp(`(${escapeRegExp(prefix)}|${escapeRegExp(keep.prefix)})([\\w-:]+)`, "g");
	const map = /* @__PURE__ */ new Map();
	for (const item of Array.from(code.original.matchAll(extraRE))) {
		let result = map.get(item[0]);
		if (result === false) continue;
		else if (!result) {
			const r = await expandShortcut(item[2], uno);
			if (r) {
				result = r[0].join(" ");
				map.set(item[0], result);
			} else {
				map.set(item[0], false);
				continue;
			}
		}
		if (item[1] === keep.prefix) {
			result = `${item[2]} ${result}`;
			if (keep.block) uno.config.blocklist = [...new Set([...uno.config.blocklist, item[2]])];
		}
		code.overwrite(item.index, item.index + item[0].length, result);
	}
}
async function expandShortcut(input, uno, depth = 5) {
	if (depth <= 0) return;
	let result;
	for (const shortcut of uno.config.shortcuts) if (isStaticShortcut(shortcut)) {
		if (shortcut[0] === input) result = shortcut[1];
	} else {
		const match = input.match(shortcut[0]);
		if (match != null) result = shortcut[1](match, {});
	}
	if (isString(result)) result = expandVariantGroup(result.trim()).split(/\s+/g);
	if (!result) return;
	return [(await Promise.all(result.filter((s) => s !== input).map(async (r) => (isString(r) ? (await expandShortcut(r, uno, depth - 1))?.[0] : void 0) || [r]))).flat(1).filter(Boolean)];
}
function escapeRegExp(str) {
	return str.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
}
//#endregion
export { transformerAlias as default, expandShortcut, transformAlias };