@oat-sa/tao-item-runner-qti/src/scoring/processor/expressions/operators/delete.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 delete operator processor.
 * @see http://www.imsglobal.org/question/qtiv2p1/imsqti_infov2p1.html#element10628
 *
 * @author Bertrand Chevrier <bertrand@taotesting.com>
 */
import _ from 'lodash';
import errorHandler from 'taoQtiItem/scoring/processor/errorHandler';

/**
 * Process operands and returns delete result.
 * @type {OperatorProcessor}
 * @exports taoQtiItem/scoring/processor/expressions/operators/delete
 */
var deleteProcessor = {
    constraints: {
        minOperand: 2,
        maxOperand: 2,
        cardinality: ['multiple', 'single', 'ordered'],
        baseType: [
            'identifier',
            'boolean',
            'integer',
            'float',
            'string',
            'point',
            'pair',
            'directedPair',
            'file',
            'uri',
            'intOrIdentifier',
            'duration'
        ]
    },

    operands: [],

    /**
     * @returns {?ProcessingValue} a single boolean
     */
    process: function () {
        var result = {};
        var op1, op2;

        //if at least one operand is null, then break and return null
        if (_.some(this.operands, _.isNull) === true) {
            return null;
        }
        if (Object.keys(_.countBy(this.operands, 'baseType')).length !== 1) {
            errorHandler.throw('scoring', new Error('operands must be of the same baseType'));
            return null;
        }

        if (
            this.operands[0].cardinality !== 'single' ||
            !['multiple', 'ordered'].includes(this.operands[1].cardinality)
        ) {
            errorHandler.throw('scoring', new Error('operands must be of the specific cardinality'));
            return null;
        }

        op1 = this.preProcessor.parseVariable(this.operands[0]);
        op2 = this.preProcessor.parseVariable(this.operands[1]);

        result.value = _.reject(op2.value, function (e) {
            return op1.value === e;
        });

        result.baseType = op1.baseType;
        result.cardinality = op2.cardinality;

        return result;
    }
};

export default deleteProcessor;