src/util/model.js

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define(function(require) {

    var formatUtil = require('./format');
    var nubmerUtil = require('./number');
    var Model = require('../model/Model');
    var zrUtil = require('zrender/core/util');

    var modelUtil = {};

    /**
     * If value is not array, then translate it to array.
     * @param  {*} value
     * @return {Array} [value] or value
     */
    modelUtil.normalizeToArray = function (value) {
        return value instanceof Array
            ? value
            : value == null
            ? []
            : [value];
    };

    /**
     * Sync default option between normal and emphasis like `position` and `show`
     * In case some one will write code like
     *     label: {
     *         normal: {
     *             show: false,
     *             position: 'outside',
     *             textStyle: {
     *                 fontSize: 18
     *             }
     *         },
     *         emphasis: {
     *             show: true
     *         }
     *     }
     * @param {Object} opt
     * @param {Array.<string>} subOpts
     */
     modelUtil.defaultEmphasis = function (opt, subOpts) {
        if (opt) {
            var emphasisOpt = opt.emphasis = opt.emphasis || {};
            var normalOpt = opt.normal = opt.normal || {};

            // Default emphasis option from normal
            zrUtil.each(subOpts, function (subOptName) {
                var val = zrUtil.retrieve(emphasisOpt[subOptName], normalOpt[subOptName]);
                if (val != null) {
                    emphasisOpt[subOptName] = val;
                }
            });
        }
    };

    modelUtil.LABEL_OPTIONS = ['position', 'show', 'textStyle', 'distance', 'formatter'];

    /**
     * data could be [12, 2323, {value: 223}, [1221, 23], {value: [2, 23]}]
     * This helper method retieves value from data.