nagix/chartjs-plugin-datasource

'use strict';

import Chart from 'chart.js';

var helpers = Chart.helpers;

var datasourceHelpers = {
    // For Chart.js 2.6.0 backward compatibility
    isObject: helpers.isObject || function(value) {
        return value !== null && Object.prototype.toString.call(value) === '[object Object]';
    },

    // For Chart.js 2.6.0 backward compatibility
    valueOrDefault: helpers.valueOrDefault || helpers.getValueOrDefault,

    getExtension: function(url) {
        var matches = url.match(/^[^?#]*\.([0-9a-z]+)(?:[?#]|$)/i);

        if (matches) {
            return matches[1];
        }
    },

    transpose: function(arrays) {
        var columns, rows, result, i, j, array;

        if (!arrays.length || !arrays[0].length) {
            return [[]];
        }

        columns = arrays[0].length;
        rows = arrays.length;
        result = [];

        for (i = 0; i < columns; ++i) {
            array = [];
            for (j = 0; j < rows; ++j) {
                array.push(arrays[j][i]);
            }
            result.push(array);
        }
        return result;
    },

    dedup: function(array) {
        return array.filter(function(value, i) {
            return array.indexOf(value) === i;
        });
    }
};

export default datasourceHelpers;