Arnaud
38 lines
1.2 KiB
TypeScript
38 lines
1.2 KiB
TypeScript
const UNICODE_FRACTIONS: Record<string, number> = {
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"½": 0.5, "⅓": 1/3, "⅔": 2/3, "¼": 0.25, "¾": 0.75,
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"⅕": 0.2, "⅖": 0.4, "⅗": 0.6, "⅘": 0.8,
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"⅙": 1/6, "⅚": 5/6, "⅛": 0.125, "⅜": 0.375, "⅝": 0.625, "⅞": 0.875,
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};
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export function parseQuantity(v: string | number | undefined): string | undefined {
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if (v === undefined || v === "") return undefined;
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const s = String(v).trim();
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if (!s) return undefined;
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if (UNICODE_FRACTIONS[s] !== undefined) return String(UNICODE_FRACTIONS[s]);
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for (const [frac, val] of Object.entries(UNICODE_FRACTIONS)) {
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if (s.endsWith(frac)) {
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const whole = s.slice(0, -frac.length).trim();
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if (!whole) return String(val);
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const w = parseFloat(whole);
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if (!isNaN(w)) return String(w + val);
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}
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}
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const mixed = s.match(/^(\d+)\s+(\d+)\s*\/\s*(\d+)$/);
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if (mixed) {
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const den = parseInt(mixed[3]!);
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if (den !== 0) return String(parseInt(mixed[1]!) + parseInt(mixed[2]!) / den);
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}
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const slash = s.match(/^(\d+)\s*\/\s*(\d+)$/);
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if (slash) {
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const den = parseInt(slash[2]!);
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if (den !== 0) return String(parseInt(slash[1]!) / den);
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}
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const n = parseFloat(s);
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return isNaN(n) ? undefined : String(n);
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}
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