38 lines
1.0 KiB
JavaScript
38 lines
1.0 KiB
JavaScript
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// src/utils.ts
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import { isNumber, range, uniq } from "@antfu/utils";
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function parseRangeString(total, rangeStr) {
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if (!rangeStr || rangeStr === "all" || rangeStr === "*")
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return range(1, total + 1);
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if (rangeStr === "none")
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return [];
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const indexes = [];
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for (const part of rangeStr.split(/[,;]/g)) {
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if (!part.includes("-")) {
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indexes.push(+part);
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} else {
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const [start, end] = part.split("-", 2);
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indexes.push(
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...range(+start, !end ? total + 1 : +end + 1)
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);
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}
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}
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return uniq(indexes).filter((i) => i <= total).sort((a, b) => a - b);
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}
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function parseAspectRatio(str) {
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if (isNumber(str))
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return str;
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if (!Number.isNaN(+str))
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return +str;
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const [wStr = "", hStr = ""] = str.split(/[:/x|]/);
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const w = Number.parseFloat(wStr.trim());
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const h = Number.parseFloat(hStr.trim());
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if (Number.isNaN(w) || Number.isNaN(h) || h === 0)
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throw new Error(`Invalid aspect ratio "${str}"`);
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return w / h;
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}
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export {
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parseRangeString,
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parseAspectRatio
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};
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