Function allValidUsages

test/fixtures/wpt/WebCryptoAPI/util/helpers.js:237–262

(validUsages, emptyIsValid, mandatoryUsages)

// it should be an array containing those usages of which one must be
// included.
function allValidUsages(validUsages, emptyIsValid, mandatoryUsages) {
    if (typeof mandatoryUsages === "undefined") {
        mandatoryUsages = [];
    }

    var okaySubsets = [];
    allNonemptySubsetsOf(validUsages).forEach(function(subset) {
        if (mandatoryUsages.length === 0) {
            okaySubsets.push(subset);
        } else {
            for (var i=0; i<mandatoryUsages.length; i++) {
                if (subset.includes(mandatoryUsages[i])) {
                    okaySubsets.push(subset);
                    return;
                }
            }
        }
    });

    if (emptyIsValid && validUsages.length !== 0) {
        okaySubsets.push([]);
    }

    okaySubsets.push(validUsages.concat(mandatoryUsages).concat(validUsages)); // Repeated values are allowed
    return okaySubsets;
}

function unique(names) {
    return [...new Set(names)];