Marc Mintel
5397309103
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28 lines
779 B
Plaintext
28 lines
779 B
Plaintext
import { IsSanctionedSimpleUnitIdentifier } from "./IsSanctionedSimpleUnitIdentifier.js";
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/**
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* This follows https://tc39.es/ecma402/#sec-case-sensitivity-and-case-mapping
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* @param str string to convert
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*/
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function toLowerCase(str) {
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return str.replace(/([A-Z])/g, (_, c) => c.toLowerCase());
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}
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/**
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* https://tc39.es/ecma402/#sec-iswellformedunitidentifier
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* @param unit
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*/
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export function IsWellFormedUnitIdentifier(unit) {
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unit = toLowerCase(unit);
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if (IsSanctionedSimpleUnitIdentifier(unit)) {
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return true;
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}
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const units = unit.split("-per-");
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if (units.length !== 2) {
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return false;
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}
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const [numerator, denominator] = units;
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if (!IsSanctionedSimpleUnitIdentifier(numerator) || !IsSanctionedSimpleUnitIdentifier(denominator)) {
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return false;
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}
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return true;
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}
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