Scratch 3 Extension - test #1

exttest.js

(function(ext) {
    function isUndefined(v) {
        return typeof v === 'undefined';
    }

    function originalOrEmptyStr(v) {
        return isUndefined(v) ? '' : v;
    }

    ext._shutdown = function() {};

    ext._getStatus = function() {
        return {status: 2, msg: 'Ready'};
    };


    ext.valueVoid = function() {
    };


    var maps = {};

    ext.defineMap = function(name) {
        if(!isUndefined(maps[name])) {
            maps[name] = {};
        }
    };
    ext.deleteMap = function(name) {
        maps[name] = null;
    };

    ext.getValueFromMap = function(key, name) {
        var map = maps[name];

        if(!isUndefined(map)) {
            var value = map[key];
            return originalOrEmptyStr(value);
        } else {
            return '';
        }
    };
    ext.setValueInMap = function(key, name, value) {
        var map = maps[name];

        if(!isUndefined(map)) {
            var oldValue = map[key];
            map[key] = value;
            return originalOrEmptyStr(value);
        } else {
            return '';
        }
    };

    ext.containsKey = function(name, key) {
        var map = maps[name];

        if(!isUndefined(map)) {
            return !isUndefined(map[key]);
        }
        return false;
    };
	
	
    var descriptor = {
        blocks: [
            // [type, displayName, func, defaultParams...]
            [' ', 'run %n', 'valueVoid', ''],

            [' ', 'create map named %s', 'defineMap', 'map'],
            [' ', 'delete map named %s', 'deleteMap', 'map'],
            ['r', 'get value with key %s in map %s', 'getValueFromMap', 'key', 'map'],
            ['r', 'set value with key %s in map %s to %s', 'setValueInMap', 'key', 'map', 'value'],
            ['b', 'map %s contains %s as a key?', 'containsKey', 'map', 'key']
        ],
		url: '',
		displayName: 'Test Extension'
    };

    ScratchExtensions.register('testext1', descriptor, ext);
})({});