17 lines
745 B
TypeScript
17 lines
745 B
TypeScript
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/* eslint max-statements-per-line: ["error", { "max": 2 }] */
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const suffixes = /(#|\/)+$/;
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const trailingHash = /#$/;
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const isDomain = /^[^:]+:\/\/[^/]+\//;
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const trailingFragments = /\/[^/]*$/;
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const idAndPointer = /#.*$/;
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export default function joinScope(previous?: string, id?: string) {
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if (previous == null && id == null) { return "#"; }
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if (id == null) { return previous.replace(trailingHash, ""); }
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if (previous == null) { return id.replace(trailingHash, ""); }
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if (id[0] === "#") { return `${previous.replace(idAndPointer, "")}${id.replace(suffixes, "")}`; }
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if (isDomain.test(id)) { return id.replace(trailingHash, ""); }
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return `${previous.replace(trailingFragments, "")}/${id.replace(trailingHash, "")}`;
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}
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