Function getUndoPath

lib/util/identifier.js:460–485

(filename, outputPath, enforceRelative)

 * @returns {string} repeated ../ to leave the directory of the provided filename to be back on output dir
 */
const getUndoPath = (filename, outputPath, enforceRelative) => {
	let depth = -1;
	let append = "";
	outputPath = outputPath.replace(/[\\/]$/, "");
	for (const part of filename.split(/[/\\]+/)) {
		if (part === "..") {
			if (depth > -1) {
				depth--;
			} else {
				const i = outputPath.lastIndexOf("/");
				const j = outputPath.lastIndexOf("\\");
				const pos = i < 0 ? j : j < 0 ? i : Math.max(i, j);
				if (pos < 0) return `${outputPath}/`;
				append = `${outputPath.slice(pos + 1)}/${append}`;
				outputPath = outputPath.slice(0, pos);
			}
		} else if (part !== ".") {
			depth++;
		}
	}
	return depth > 0
		? `${"../".repeat(depth)}${append}`
		: enforceRelative
			? `./${append}`
			: append;
};

const HASH_REGEXP = /(?<!\0)#/g;