@oat-sa/tao-item-runner-qti/src/qtiItem/helper/interactionHelper.js

TAO QTI Item Runner modules

/**
 * Common helper functions
 */
import _ from 'lodash';
import Element from 'taoQtiItem/qtiItem/core/Element';
export default {
    convertChoices: function (choices, outputType) {
        var ret = [],
            _this = this;

        _.forEach(choices, function (c) {
            if (Element.isA(c, 'choice')) {
                switch (outputType) {
                    case 'serial':
                        ret.push(c.getSerial());
                        break;
                    case 'identifier':
                        ret.push(c.id());
                        break;
                    default:
                        ret.push(c);
                }
            } else if (_.isArray(c)) {
                ret.push(_this.convertChoices(c, outputType));
            }
        });

        return ret;
    },
    findChoices: function (interaction, choices, inputType) {
        var ret = [],
            _this = this;

        _.forEach(choices, function (c) {
            var choice;
            if (_.isString(c)) {
                if (inputType === 'serial') {
                    choice = interaction.getChoice(c);
                    if (choice) {
                        ret.push(choice);
                    }
                } else if (inputType === 'identifier') {
                    choice = interaction.getChoiceByIdentifier(c);
                    if (choice) {
                        ret.push(choice);
                    }
                } else {
                    ret.push(c);
                }
            } else if (_.isArray(c)) {
                ret.push(_this.findChoices(interaction, c, inputType));
            } else {
                ret.push(c);
            }
        });

        return ret;
    },
    shuffleChoices: function (choices) {
        var r = [], //returned array
            f = {}, //fixed choices array
            j = 0;

        for (var i in choices) {
            if (Element.isA(choices[i], 'choice')) {
                var choice = choices[i];
                if (choice.attr('fixed')) {
                    f[j] = choice;
                }
                r.push(choice);
                j++;
            } else {
                throw 'invalid element in array: is not a qti choice';
            }
        }

        for (var n = 0; n < r.length - 1; n++) {
            if (f[n]) {
                continue;
            }
            var k = -1;
            do {
                k = n + Math.floor(Math.random() * (r.length - n));
            } while (f[k]);
            var tmp = r[k];
            r[k] = r[n];
            r[n] = tmp;
        }

        return r;
    },
    serialToIdentifier: function (interaction, choiceSerial) {
        var choice = interaction.getChoice(choiceSerial);
        if (choice) {
            return choice.id();
        } else {
            return '';
        }
    }
};