@markuplint/ml-spec/lib/utils/resolve-namespace.js

Types and schema that specs of the Markup languages for markuplint

import { getNS } from './get-ns.js';
const cache = new Map();
const namespaceURIMap = {
    html: 'http://www.w3.org/1999/xhtml',
    svg: 'http://www.w3.org/2000/svg',
    mml: 'http://www.w3.org/1998/Math/MathML',
    xlink: 'http://www.w3.org/1999/xlink',
};
export function resolveNamespace(name, namespaceURI = 'http://www.w3.org/1999/xhtml') {
    const cached = cache.get(name + namespaceURI);
    if (cached) {
        return cached;
    }
    const [_explicitNS, _localName] = name.split(':');
    const explicitNS = _localName ? _explicitNS : null;
    const localName = _localName ?? _explicitNS ?? '';
    const namespace = ['html', 'svg', 'mml', 'xlink'].find(_ns => _ns === (explicitNS || getNS(namespaceURI ?? null))) ||
        'html';
    const result = {
        localNameWithNS: `${namespace === 'html' ? '' : `${namespace}:`}${localName}`,
        localName,
        namespace,
        namespaceURI: namespaceURIMap[namespace],
    };
    cache.set(name + namespaceURI, result);
    return result;
}