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rOACCT/node_modules/nth-check/lib/parse.js
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parse.js
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			"use strict";
			// Following http://www.w3.org/TR/css3-selectors/#nth-child-pseudo
			Object.defineProperty(exports, "__esModule", { value: true });
			exports.parse = void 0;
			// Whitespace as per https://www.w3.org/TR/selectors-3/#lex is " \t\r\n\f"
			var whitespace = new Set([9, 10, 12, 13, 32]);
			var ZERO = "0".charCodeAt(0);
			var NINE = "9".charCodeAt(0);
			/**
			* Parses an expression.
			*
			* @throws An `Error` if parsing fails.
			* @returns An array containing the integer step size and the integer offset of the nth rule.
			* @example nthCheck.parse("2n+3"); // returns [2, 3]
			*/
			function parse(formula) {
			formula = formula.trim().toLowerCase();
			if (formula === "even") {
			return [2, 0];
			}
			else if (formula === "odd") {
			return [2, 1];
			}
			// Parse [ ['-'\|'+']? INTEGER? {N} [ S* ['-'\|'+'] S* INTEGER ]?
			var idx = 0;
			var a = 0;
			var sign = readSign();
			var number = readNumber();
			if (idx < formula.length && formula.charAt(idx) === "n") {
			idx++;
			a = sign * (number !== null && number !== void 0 ? number : 1);
			skipWhitespace();
			if (idx < formula.length) {
			sign = readSign();
			skipWhitespace();
			number = readNumber();
			}
			else {
			sign = number = 0;
			}
			}
			// Throw if there is anything else
			if (number === null \|\| idx < formula.length) {
			throw new Error("n-th rule couldn't be parsed ('".concat(formula, "')"));
			}
			return [a, sign * number];
			function readSign() {
			if (formula.charAt(idx) === "-") {
			idx++;
			return -1;
			}
			if (formula.charAt(idx) === "+") {
			idx++;
			}
			return 1;
			}
			function readNumber() {
			var start = idx;
			var value = 0;
			while (idx < formula.length &&
			formula.charCodeAt(idx) >= ZERO &&
			formula.charCodeAt(idx) <= NINE) {
			value = value * 10 + (formula.charCodeAt(idx) - ZERO);
			idx++;
			}
			// Return `null` if we didn't read anything.
			return idx === start ? null : value;
			}
			function skipWhitespace() {
			while (idx < formula.length &&
			whitespace.has(formula.charCodeAt(idx))) {
			idx++;
			}
			}
			}
			exports.parse = parse;
			//# sourceMappingURL=parse.js.map