Function parseIndexParameter

docs/app/js/sanddance-app.js:148118–148121

* Parse parameter for accessing an index of another data set.

(def, spec, scope)

/**
 * Parse parameter for accessing an index of another data set.
 */ function parseIndexParameter(def, spec, scope) {
    if (!(0, _vegaUtil.isString)(spec.from)) (0, _vegaUtil.error)('Lookup "from" parameter must be a string literal.');
    return scope.getData(spec.from).lookupRef(scope, spec.key);
}
/**
 * Parse a parameter that contains one or more sub-parameter objects.
 */ function parseSubParameters(def, spec, scope) {