37 lines
944 B
JavaScript
37 lines
944 B
JavaScript
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/**
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* @param {string} string The string to parse
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* @returns {Array<number>} Returns an energetic array.
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*/
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function parsePart(string) {
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let res = [];
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let m;
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for (let str of string.split(",").map((str) => str.trim())) {
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// just a number
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if (/^-?\d+$/.test(str)) {
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res.push(parseInt(str, 10));
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} else if (
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(m = str.match(/^(-?\d+)(-|\.\.\.?|\u2025|\u2026|\u22EF)(-?\d+)$/))
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) {
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// 1-5 or 1..5 (equivalent) or 1...5 (doesn't include 5)
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let [_, lhs, sep, rhs] = m;
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if (lhs && rhs) {
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lhs = parseInt(lhs);
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rhs = parseInt(rhs);
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const incr = lhs < rhs ? 1 : -1;
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// Make it inclusive by moving the right 'stop-point' away by one.
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if (sep === "-" || sep === ".." || sep === "\u2025") rhs += incr;
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for (let i = lhs; i !== rhs; i += incr) res.push(i);
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}
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}
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}
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return res;
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}
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exports.default = parsePart;
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module.exports = parsePart;
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