Function formatRange

lib/util/compileBooleanMatcher.js:73–87

(start, end)

 * @returns {string} formatted range
 */
const formatRange = (start, end) => {
	const startCode = start.charCodeAt(0);
	const endCode = end.charCodeAt(0);
	const length = endCode - startCode + 1;

	if (length === 1) {
		return quoteMetaInCharClass(start);
	}
	if (length === 2) {
		// For 2 chars, just list them (e.g., "ab" instead of "a-b")
		return quoteMetaInCharClass(start) + quoteMetaInCharClass(end);
	}
	// For 3+ chars, use range notation
	return `${quoteMetaInCharClass(start)}-${quoteMetaInCharClass(end)}`;
};

/**
 * Returns string.