@oat-sa/tao-item-runner-qti/src/scoring/processor/expressions/operators/anyN.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 anyN operator processor.
 * @see http://www.imsglobal.org/question/qtiv2p1/imsqti_infov2p1.html#element10641
 *
 * @author Bertrand Chevrier <bertrand@taotesting.com>
 */

/**
 * Process operands and returns the anyN.
 * @type {OperatorProcessor}
 * @exports taoQtiItem/scoring/processor/expressions/operators/anyN
 */
var anyNProcessor = {

    constraints: {
        minOperand: 1,
        maxOperand: -1,
        cardinality: ['single'],
        baseType: ['boolean']
    },

    operands: [],

    /**
     * Process the anyN of the operands.
     * @returns {?ProcessingValue} is anyN or null
     */
    process: function() {

        var result = {
            cardinality: 'single',
            baseType: 'boolean'
        };

        var min = this.preProcessor.parseValue(this.expression.attributes.min, 'integerOrVariableRef'),
            max = this.preProcessor.parseValue(this.expression.attributes.max, 'integerOrVariableRef');

        var counted = this.preProcessor.parseOperands(this.operands).countBy().value();
        if (counted.true >= min && counted.true <= max) {
            result.value = true;
        } else if (counted.true + counted.null >= min && counted.true + counted.null <= max) {
            // It could have match if nulls were true values.
            return null;
        } else {
            result.value = false;
        }

        return result;
    }
};

export default anyNProcessor;