RubyLouvre/anu

const HTML_NAMESPACE = 'http://www.w3.org/1999/xhtml';
const MATH_NAMESPACE = 'http://www.w3.org/1998/Math/MathML';
const SVG_NAMESPACE = 'http://www.w3.org/2000/svg';

export const Namespaces = {
    html: HTML_NAMESPACE,
    mathml: MATH_NAMESPACE,
    svg: SVG_NAMESPACE,
};

// Assumes there is no parent namespace.
export function getIntrinsicNamespace(type) {
    switch (type) {
    case 'svg':
        return SVG_NAMESPACE;
    case 'math':
        return MATH_NAMESPACE;
    default:
        return HTML_NAMESPACE;
    }
}

export function getChildNamespace(parentNamespace, type) {
    if (parentNamespace == null || parentNamespace === HTML_NAMESPACE) {
    // No (or default) parent namespace: potential entry point.
        return getIntrinsicNamespace(type);
    }
    if (parentNamespace === SVG_NAMESPACE && type === 'foreignObject') {
    // We're leaving SVG.
        return HTML_NAMESPACE;
    }
    // By default, pass namespace below.
    return parentNamespace;
}