is-graph-pointer/index.js

Check what a graph pointer is pointing at

export function isGraphPointer(arg) {
    return typeof arg === 'object' && !!arg && 'term' in arg && !!arg.term;
}
export function isResource(arg) {
    return isGraphPointer(arg) && (arg.term.termType === 'BlankNode' || arg.term.termType === 'NamedNode');
}
export function isNamedNode(arg) {
    return isGraphPointer(arg) && arg.term.termType === 'NamedNode';
}
export function isBlankNode(arg) {
    return isGraphPointer(arg) && arg.term.termType === 'BlankNode';
}
export function isLiteral(arg, dtOrLang) {
    const itIsLiteral = isGraphPointer(arg) && arg.term.termType === 'Literal';
    if (itIsLiteral && typeof dtOrLang === 'string') {
        return arg.term.language === dtOrLang;
    }
    if (itIsLiteral && typeof dtOrLang === 'object') {
        return arg.term.datatype.equals(dtOrLang);
    }
    return itIsLiteral;
}
export default {
    isGraphPointer,
    isResource,
    isNamedNode,
    isBlankNode,
    isLiteral,
};