@oat-sa/tao-test-runner-qti/src/branchRule/helpers/branchRuleHelper.js

TAO Test Runner QTI implementation

/**
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; under version 2
 * of the License (non-upgradable).
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright (c) 2019 (original work) Open Assessment Technologies SA ;
 */

import _ from 'lodash';

/**
 * Parses sub branch rules and returns an array of results
 *
 * @param {Object} branchRuleDefinition
 * @param {Object} item
 * @param {Object} navigationParams
 * @param {Function} branchRuleMapper
 * @param {Object} responseStore
 * @returns {Promise<boolean[]>}
 */
function evaluateSubBranchRules(branchRuleDefinition, item, navigationParams, branchRuleMapper, responseStore) {
    return new Promise(function(resolve, reject) {
        var subBranchRuleResults = [],
            promises = [];

        // Remove the @attributes from the branch rule definition
        branchRuleDefinition = _.omit(branchRuleDefinition, ['@attributes']);

        promises = _.map(branchRuleDefinition, function(subBranchRule, subBranchRuleName) {
            return branchRuleMapper(
                subBranchRuleName,
                branchRuleDefinition[subBranchRuleName],
                item,
                navigationParams,
                responseStore
            ).validate();
        });

        Promise.all(promises)
            .then(function(results) {
                _.forEach(results, function(subBranchRuleResult) {
                    // if the result is an array (e.g. in case of NOT), add all elements of it to the results
                    if (Array.isArray(subBranchRuleResult)) {
                        subBranchRuleResult.forEach(function(value) {
                            subBranchRuleResults.push(value);
                        });
                        // otherwise add the single value to the results
                    } else {
                        subBranchRuleResults.push(subBranchRuleResult);
                    }
                });

                resolve(subBranchRuleResults);
            })
            .catch(function(err) {
                reject(err);
            });
    });
}

export default {
    evaluateSubBranchRules: evaluateSubBranchRules
};