@oat-sa/tao-item-runner-qti/src/scoring/processor/responseRules/responseCondition.js

TAO QTI Item Runner modules

/*
 * 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) 2015-2019 (original work) Open Assessment Technlogies SA (under the project TAO-PRODUCT);
 *
 */

/**
 * The responseCondition processor.
 * @see http://www.imsglobal.org/question/qtiv2p1/imsqti_infov2p1.html#element10421
 *
 * @author Bertrand Chevrier <bertrand@taotesting.com>
 */
import expressionEngineFactory from 'taoQtiItem/scoring/processor/expressions/engine';

/**
 * The rule processor.
 *
 * @type {responseRuleProcessor}
 * @exports taoQtiItem/scoring/processor/responseRules/responseCondition
 */
var responseConditionProcessor = {

    /**
     * Process the rule
     * @returns {Array}
     */
    process: function() {

        var index = 0;
        var expressionEngine = expressionEngineFactory(this.state);

        //eval a condition using the expression engine
        var evalRuleCondition = function evalRuleCondition(rule) {
            var expressionResult;
            if (!rule.expression) {
                return false;
            }

            expressionResult = expressionEngine.execute(rule.expression);

            return expressionResult && expressionResult.value === true;
        };

        //the if condition
        if (evalRuleCondition(this.rule.responseIf)) {
            return this.rule.responseIf.responseRules;
        }

        //else if conditions
        if (this.rule.responseElseIfs) {

            for (index in this.rule.responseElseIfs) {
                if (evalRuleCondition(this.rule.responseElseIfs[index])) {
                    return this.rule.responseElseIfs[index].responseRules;
                }
            }
        }

        //the else otherwise
        if (this.rule.responseElse) {
            return this.rule.responseElse.responseRules;
        }
        return [];
    }
};

export default responseConditionProcessor;