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scratch-vm/src/engine/runtime.js
Eric Rosenbaum 0b4b32dcb0 Save and load the origin
2021-04-29 11:32:13 -04:00

2617 lines
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const EventEmitter = require('events');
const {OrderedMap} = require('immutable');
const ArgumentType = require('../extension-support/argument-type');
const Blocks = require('./blocks');
const BlocksRuntimeCache = require('./blocks-runtime-cache');
const BlockType = require('../extension-support/block-type');
const Profiler = require('./profiler');
const Sequencer = require('./sequencer');
const execute = require('./execute.js');
const ScratchBlocksConstants = require('./scratch-blocks-constants');
const TargetType = require('../extension-support/target-type');
const Thread = require('./thread');
const log = require('../util/log');
const maybeFormatMessage = require('../util/maybe-format-message');
const StageLayering = require('./stage-layering');
const Variable = require('./variable');
const xmlEscape = require('../util/xml-escape');
const ScratchLinkWebSocket = require('../util/scratch-link-websocket');
// Virtual I/O devices.
const Clock = require('../io/clock');
const Cloud = require('../io/cloud');
const Keyboard = require('../io/keyboard');
const Mouse = require('../io/mouse');
const MouseWheel = require('../io/mouseWheel');
const UserData = require('../io/userData');
const Video = require('../io/video');
const StringUtil = require('../util/string-util');
const uid = require('../util/uid');
const defaultBlockPackages = {
scratch3_control: require('../blocks/scratch3_control'),
scratch3_event: require('../blocks/scratch3_event'),
scratch3_looks: require('../blocks/scratch3_looks'),
scratch3_motion: require('../blocks/scratch3_motion'),
scratch3_operators: require('../blocks/scratch3_operators'),
scratch3_sound: require('../blocks/scratch3_sound'),
scratch3_sensing: require('../blocks/scratch3_sensing'),
scratch3_data: require('../blocks/scratch3_data'),
scratch3_procedures: require('../blocks/scratch3_procedures')
};
const defaultExtensionColors = ['#0FBD8C', '#0DA57A', '#0B8E69'];
/**
* Information used for converting Scratch argument types into scratch-blocks data.
* @type {object.<ArgumentType, {shadowType: string, fieldType: string}>}
*/
const ArgumentTypeMap = (() => {
const map = {};
map[ArgumentType.ANGLE] = {
shadow: {
type: 'math_angle',
// We specify fieldNames here so that we can pick
// create and populate a field with the defaultValue
// specified in the extension.
// When the `fieldName` property is not specified,
// the <field></field> will be left out of the XML and
// the scratch-blocks defaults for that field will be
// used instead (e.g. default of 0 for number fields)
fieldName: 'NUM'
}
};
map[ArgumentType.COLOR] = {
shadow: {
type: 'colour_picker',
fieldName: 'COLOUR'
}
};
map[ArgumentType.NUMBER] = {
shadow: {
type: 'math_number',
fieldName: 'NUM'
}
};
map[ArgumentType.STRING] = {
shadow: {
type: 'text',
fieldName: 'TEXT'
}
};
map[ArgumentType.BOOLEAN] = {
check: 'Boolean'
};
map[ArgumentType.MATRIX] = {
shadow: {
type: 'matrix',
fieldName: 'MATRIX'
}
};
map[ArgumentType.NOTE] = {
shadow: {
type: 'note',
fieldName: 'NOTE'
}
};
map[ArgumentType.IMAGE] = {
// Inline images are weird because they're not actually "arguments".
// They are more analagous to the label on a block.
fieldType: 'field_image'
};
return map;
})();
/**
* A pair of functions used to manage the cloud variable limit,
* to be used when adding (or attempting to add) or removing a cloud variable.
* @typedef {object} CloudDataManager
* @property {function} canAddCloudVariable A function to call to check that
* a cloud variable can be added.
* @property {function} addCloudVariable A function to call to track a new
* cloud variable on the runtime.
* @property {function} removeCloudVariable A function to call when
* removing an existing cloud variable.
* @property {function} hasCloudVariables A function to call to check that
* the runtime has any cloud variables.
*/
/**
* Creates and manages cloud variable limit in a project,
* and returns two functions to be used to add a new
* cloud variable (while checking that it can be added)
* and remove an existing cloud variable.
* These are to be called whenever attempting to create or delete
* a cloud variable.
* @return {CloudDataManager} The functions to be used when adding or removing a
* cloud variable.
*/
const cloudDataManager = () => {
const limit = 10;
let count = 0;
const canAddCloudVariable = () => count < limit;
const addCloudVariable = () => {
count++;
};
const removeCloudVariable = () => {
count--;
};
const hasCloudVariables = () => count > 0;
return {
canAddCloudVariable,
addCloudVariable,
removeCloudVariable,
hasCloudVariables
};
};
/**
* Numeric ID for Runtime._step in Profiler instances.
* @type {number}
*/
let stepProfilerId = -1;
/**
* Numeric ID for Sequencer.stepThreads in Profiler instances.
* @type {number}
*/
let stepThreadsProfilerId = -1;
/**
* Numeric ID for RenderWebGL.draw in Profiler instances.
* @type {number}
*/
let rendererDrawProfilerId = -1;
/**
* Manages targets, scripts, and the sequencer.
* @constructor
*/
class Runtime extends EventEmitter {
constructor () {
super();
/**
* Target management and storage.
* @type {Array.<!Target>}
*/
this.targets = [];
/**
* Targets in reverse order of execution. Shares its order with drawables.
* @type {Array.<!Target>}
*/
this.executableTargets = [];
/**
* A list of threads that are currently running in the VM.
* Threads are added when execution starts and pruned when execution ends.
* @type {Array.<Thread>}
*/
this.threads = [];
/** @type {!Sequencer} */
this.sequencer = new Sequencer(this);
/**
* Storage container for flyout blocks.
* These will execute on `_editingTarget.`
* @type {!Blocks}
*/
this.flyoutBlocks = new Blocks(this, true /* force no glow */);
/**
* Storage container for monitor blocks.
* These will execute on a target maybe
* @type {!Blocks}
*/
this.monitorBlocks = new Blocks(this, true /* force no glow */);
/**
* Currently known editing target for the VM.
* @type {?Target}
*/
this._editingTarget = null;
/**
* Map to look up a block primitive's implementation function by its opcode.
* This is a two-step lookup: package name first, then primitive name.
* @type {Object.<string, Function>}
*/
this._primitives = {};
/**
* Map to look up all block information by extended opcode.
* @type {Array.<CategoryInfo>}
* @private
*/
this._blockInfo = [];
/**
* Map to look up hat blocks' metadata.
* Keys are opcode for hat, values are metadata objects.
* @type {Object.<string, Object>}
*/
this._hats = {};
/**
* A list of script block IDs that were glowing during the previous frame.
* @type {!Array.<!string>}
*/
this._scriptGlowsPreviousFrame = [];
/**
* Number of non-monitor threads running during the previous frame.
* @type {number}
*/
this._nonMonitorThreadCount = 0;
/**
* All threads that finished running and were removed from this.threads
* by behaviour in Sequencer.stepThreads.
* @type {Array<Thread>}
*/
this._lastStepDoneThreads = null;
/**
* Currently known number of clones, used to enforce clone limit.
* @type {number}
*/
this._cloneCounter = 0;
/**
* Flag to emit a targets update at the end of a step. When target data
* changes, this flag is set to true.
* @type {boolean}
*/
this._refreshTargets = false;
/**
* Map to look up all monitor block information by opcode.
* @type {object}
* @private
*/
this.monitorBlockInfo = {};
/**
* Ordered map of all monitors, which are MonitorReporter objects.
*/
this._monitorState = OrderedMap({});
/**
* Monitor state from last tick
*/
this._prevMonitorState = OrderedMap({});
/**
* Whether the project is in "turbo mode."
* @type {Boolean}
*/
this.turboMode = false;
/**
* Whether the project is in "compatibility mode" (30 TPS).
* @type {Boolean}
*/
this.compatibilityMode = false;
/**
* A reference to the current runtime stepping interval, set
* by a `setInterval`.
* @type {!number}
*/
this._steppingInterval = null;
/**
* Current length of a step.
* Changes as mode switches, and used by the sequencer to calculate
* WORK_TIME.
* @type {!number}
*/
this.currentStepTime = null;
// Set an intial value for this.currentMSecs
this.updateCurrentMSecs();
/**
* Whether any primitive has requested a redraw.
* Affects whether `Sequencer.stepThreads` will yield
* after stepping each thread.
* Reset on every frame.
* @type {boolean}
*/
this.redrawRequested = false;
// Register all given block packages.
this._registerBlockPackages();
// Register and initialize "IO devices", containers for processing
// I/O related data.
/** @type {Object.<string, Object>} */
this.ioDevices = {
clock: new Clock(this),
cloud: new Cloud(this),
keyboard: new Keyboard(this),
mouse: new Mouse(this),
mouseWheel: new MouseWheel(this),
userData: new UserData(),
video: new Video(this)
};
/**
* A list of extensions, used to manage hardware connection.
*/
this.peripheralExtensions = {};
/**
* A runtime profiler that records timed events for later playback to
* diagnose Scratch performance.
* @type {Profiler}
*/
this.profiler = null;
const newCloudDataManager = cloudDataManager();
/**
* Check wether the runtime has any cloud data.
* @type {function}
* @return {boolean} Whether or not the runtime currently has any
* cloud variables.
*/
this.hasCloudData = newCloudDataManager.hasCloudVariables;
/**
* A function which checks whether a new cloud variable can be added
* to the runtime.
* @type {function}
* @return {boolean} Whether or not a new cloud variable can be added
* to the runtime.
*/
this.canAddCloudVariable = newCloudDataManager.canAddCloudVariable;
/**
* A function that tracks a new cloud variable in the runtime,
* updating the cloud variable limit. Calling this function will
* emit a cloud data update event if this is the first cloud variable
* being added.
* @type {function}
*/
this.addCloudVariable = this._initializeAddCloudVariable(newCloudDataManager);
/**
* A function which updates the runtime's cloud variable limit
* when removing a cloud variable and emits a cloud update event
* if the last of the cloud variables is being removed.
* @type {function}
*/
this.removeCloudVariable = this._initializeRemoveCloudVariable(newCloudDataManager);
/**
* A string representing the origin of the current project from outside of the
* Scratch community, such as CSFirst.
* @type {?string}
*/
this.origin = null;
}
/**
* Width of the stage, in pixels.
* @const {number}
*/
static get STAGE_WIDTH () {
return 480;
}
/**
* Height of the stage, in pixels.
* @const {number}
*/
static get STAGE_HEIGHT () {
return 360;
}
/**
* Event name for glowing a script.
* @const {string}
*/
static get SCRIPT_GLOW_ON () {
return 'SCRIPT_GLOW_ON';
}
/**
* Event name for unglowing a script.
* @const {string}
*/
static get SCRIPT_GLOW_OFF () {
return 'SCRIPT_GLOW_OFF';
}
/**
* Event name for glowing a block.
* @const {string}
*/
static get BLOCK_GLOW_ON () {
return 'BLOCK_GLOW_ON';
}
/**
* Event name for unglowing a block.
* @const {string}
*/
static get BLOCK_GLOW_OFF () {
return 'BLOCK_GLOW_OFF';
}
/**
* Event name for a cloud data update
* to this project.
* @const {string}
*/
static get HAS_CLOUD_DATA_UPDATE () {
return 'HAS_CLOUD_DATA_UPDATE';
}
/**
* Event name for turning on turbo mode.
* @const {string}
*/
static get TURBO_MODE_ON () {
return 'TURBO_MODE_ON';
}
/**
* Event name for turning off turbo mode.
* @const {string}
*/
static get TURBO_MODE_OFF () {
return 'TURBO_MODE_OFF';
}
/**
* Event name when the project is started (threads may not necessarily be
* running).
* @const {string}
*/
static get PROJECT_START () {
return 'PROJECT_START';
}
/**
* Event name when threads start running.
* Used by the UI to indicate running status.
* @const {string}
*/
static get PROJECT_RUN_START () {
return 'PROJECT_RUN_START';
}
/**
* Event name when threads stop running
* Used by the UI to indicate not-running status.
* @const {string}
*/
static get PROJECT_RUN_STOP () {
return 'PROJECT_RUN_STOP';
}
/**
* Event name for project being stopped or restarted by the user.
* Used by blocks that need to reset state.
* @const {string}
*/
static get PROJECT_STOP_ALL () {
return 'PROJECT_STOP_ALL';
}
/**
* Event name for target being stopped by a stop for target call.
* Used by blocks that need to stop individual targets.
* @const {string}
*/
static get STOP_FOR_TARGET () {
return 'STOP_FOR_TARGET';
}
/**
* Event name for visual value report.
* @const {string}
*/
static get VISUAL_REPORT () {
return 'VISUAL_REPORT';
}
/**
* Event name for project loaded report.
* @const {string}
*/
static get PROJECT_LOADED () {
return 'PROJECT_LOADED';
}
/**
* Event name for report that a change was made that can be saved
* @const {string}
*/
static get PROJECT_CHANGED () {
return 'PROJECT_CHANGED';
}
/**
* Event name for report that a change was made to an extension in the toolbox.
* @const {string}
*/
static get TOOLBOX_EXTENSIONS_NEED_UPDATE () {
return 'TOOLBOX_EXTENSIONS_NEED_UPDATE';
}
/**
* Event name for targets update report.
* @const {string}
*/
static get TARGETS_UPDATE () {
return 'TARGETS_UPDATE';
}
/**
* Event name for monitors update.
* @const {string}
*/
static get MONITORS_UPDATE () {
return 'MONITORS_UPDATE';
}
/**
* Event name for block drag update.
* @const {string}
*/
static get BLOCK_DRAG_UPDATE () {
return 'BLOCK_DRAG_UPDATE';
}
/**
* Event name for block drag end.
* @const {string}
*/
static get BLOCK_DRAG_END () {
return 'BLOCK_DRAG_END';
}
/**
* Event name for reporting that an extension was added.
* @const {string}
*/
static get EXTENSION_ADDED () {
return 'EXTENSION_ADDED';
}
/**
* Event name for reporting that an extension as asked for a custom field to be added
* @const {string}
*/
static get EXTENSION_FIELD_ADDED () {
return 'EXTENSION_FIELD_ADDED';
}
/**
* Event name for updating the available set of peripheral devices.
* This causes the peripheral connection modal to update a list of
* available peripherals.
* @const {string}
*/
static get PERIPHERAL_LIST_UPDATE () {
return 'PERIPHERAL_LIST_UPDATE';
}
/**
* Event name for when the user picks a bluetooth device to connect to
* via Companion Device Manager (CDM)
* @const {string}
*/
static get USER_PICKED_PERIPHERAL () {
return 'USER_PICKED_PERIPHERAL';
}
/**
* Event name for reporting that a peripheral has connected.
* This causes the status button in the blocks menu to indicate 'connected'.
* @const {string}
*/
static get PERIPHERAL_CONNECTED () {
return 'PERIPHERAL_CONNECTED';
}
/**
* Event name for reporting that a peripheral has been intentionally disconnected.
* This causes the status button in the blocks menu to indicate 'disconnected'.
* @const {string}
*/
static get PERIPHERAL_DISCONNECTED () {
return 'PERIPHERAL_DISCONNECTED';
}
/**
* Event name for reporting that a peripheral has encountered a request error.
* This causes the peripheral connection modal to switch to an error state.
* @const {string}
*/
static get PERIPHERAL_REQUEST_ERROR () {
return 'PERIPHERAL_REQUEST_ERROR';
}
/**
* Event name for reporting that a peripheral connection has been lost.
* This causes a 'peripheral connection lost' error alert to display.
* @const {string}
*/
static get PERIPHERAL_CONNECTION_LOST_ERROR () {
return 'PERIPHERAL_CONNECTION_LOST_ERROR';
}
/**
* Event name for reporting that a peripheral has not been discovered.
* This causes the peripheral connection modal to show a timeout state.
* @const {string}
*/
static get PERIPHERAL_SCAN_TIMEOUT () {
return 'PERIPHERAL_SCAN_TIMEOUT';
}
/**
* Event name to indicate that the microphone is being used to stream audio.
* @const {string}
*/
static get MIC_LISTENING () {
return 'MIC_LISTENING';
}
/**
* Event name for reporting that blocksInfo was updated.
* @const {string}
*/
static get BLOCKSINFO_UPDATE () {
return 'BLOCKSINFO_UPDATE';
}
/**
* Event name when the runtime tick loop has been started.
* @const {string}
*/
static get RUNTIME_STARTED () {
return 'RUNTIME_STARTED';
}
/**
* Event name when the runtime dispose has been called.
* @const {string}
*/
static get RUNTIME_DISPOSED () {
return 'RUNTIME_DISPOSED';
}
/**
* Event name for reporting that a block was updated and needs to be rerendered.
* @const {string}
*/
static get BLOCKS_NEED_UPDATE () {
return 'BLOCKS_NEED_UPDATE';
}
/**
* How rapidly we try to step threads by default, in ms.
*/
static get THREAD_STEP_INTERVAL () {
return 1000 / 60;
}
/**
* In compatibility mode, how rapidly we try to step threads, in ms.
*/
static get THREAD_STEP_INTERVAL_COMPATIBILITY () {
return 1000 / 30;
}
/**
* How many clones can be created at a time.
* @const {number}
*/
static get MAX_CLONES () {
return 300;
}
// -----------------------------------------------------------------------------
// -----------------------------------------------------------------------------
// Helper function for initializing the addCloudVariable function
_initializeAddCloudVariable (newCloudDataManager) {
// The addCloudVariable function
return (() => {
const hadCloudVarsBefore = this.hasCloudData();
newCloudDataManager.addCloudVariable();
if (!hadCloudVarsBefore && this.hasCloudData()) {
this.emit(Runtime.HAS_CLOUD_DATA_UPDATE, true);
}
});
}
// Helper function for initializing the removeCloudVariable function
_initializeRemoveCloudVariable (newCloudDataManager) {
return (() => {
const hadCloudVarsBefore = this.hasCloudData();
newCloudDataManager.removeCloudVariable();
if (hadCloudVarsBefore && !this.hasCloudData()) {
this.emit(Runtime.HAS_CLOUD_DATA_UPDATE, false);
}
});
}
/**
* Register default block packages with this runtime.
* @todo Prefix opcodes with package name.
* @private
*/
_registerBlockPackages () {
for (const packageName in defaultBlockPackages) {
if (defaultBlockPackages.hasOwnProperty(packageName)) {
// @todo pass a different runtime depending on package privilege?
const packageObject = new (defaultBlockPackages[packageName])(this);
// Collect primitives from package.
if (packageObject.getPrimitives) {
const packagePrimitives = packageObject.getPrimitives();
for (const op in packagePrimitives) {
if (packagePrimitives.hasOwnProperty(op)) {
this._primitives[op] =
packagePrimitives[op].bind(packageObject);
}
}
}
// Collect hat metadata from package.
if (packageObject.getHats) {
const packageHats = packageObject.getHats();
for (const hatName in packageHats) {
if (packageHats.hasOwnProperty(hatName)) {
this._hats[hatName] = packageHats[hatName];
}
}
}
// Collect monitored from package.
if (packageObject.getMonitored) {
this.monitorBlockInfo = Object.assign({}, this.monitorBlockInfo, packageObject.getMonitored());
}
}
}
}
getMonitorState () {
return this._monitorState;
}
/**
* Generate an extension-specific menu ID.
* @param {string} menuName - the name of the menu.
* @param {string} extensionId - the ID of the extension hosting the menu.
* @returns {string} - the constructed ID.
* @private
*/
_makeExtensionMenuId (menuName, extensionId) {
return `${extensionId}_menu_${xmlEscape(menuName)}`;
}
/**
* Create a context ("args") object for use with `formatMessage` on messages which might be target-specific.
* @param {Target} [target] - the target to use as context. If a target is not provided, default to the current
* editing target or the stage.
*/
makeMessageContextForTarget (target) {
const context = {};
target = target || this.getEditingTarget() || this.getTargetForStage();
if (target) {
context.targetType = (target.isStage ? TargetType.STAGE : TargetType.SPRITE);
}
}
/**
* Register the primitives provided by an extension.
* @param {ExtensionMetadata} extensionInfo - information about the extension (id, blocks, etc.)
* @private
*/
_registerExtensionPrimitives (extensionInfo) {
const categoryInfo = {
id: extensionInfo.id,
name: maybeFormatMessage(extensionInfo.name),
showStatusButton: extensionInfo.showStatusButton,
blockIconURI: extensionInfo.blockIconURI,
menuIconURI: extensionInfo.menuIconURI
};
if (extensionInfo.color1) {
categoryInfo.color1 = extensionInfo.color1;
categoryInfo.color2 = extensionInfo.color2;
categoryInfo.color3 = extensionInfo.color3;
} else {
categoryInfo.color1 = defaultExtensionColors[0];
categoryInfo.color2 = defaultExtensionColors[1];
categoryInfo.color3 = defaultExtensionColors[2];
}
this._blockInfo.push(categoryInfo);
this._fillExtensionCategory(categoryInfo, extensionInfo);
for (const fieldTypeName in categoryInfo.customFieldTypes) {
if (extensionInfo.customFieldTypes.hasOwnProperty(fieldTypeName)) {
const fieldTypeInfo = categoryInfo.customFieldTypes[fieldTypeName];
// Emit events for custom field types from extension
this.emit(Runtime.EXTENSION_FIELD_ADDED, {
name: `field_${fieldTypeInfo.extendedName}`,
implementation: fieldTypeInfo.fieldImplementation
});
}
}
this.emit(Runtime.EXTENSION_ADDED, categoryInfo);
}
/**
* Reregister the primitives for an extension
* @param {ExtensionMetadata} extensionInfo - new info (results of running getInfo) for an extension
* @private
*/
_refreshExtensionPrimitives (extensionInfo) {
const categoryInfo = this._blockInfo.find(info => info.id === extensionInfo.id);
if (categoryInfo) {
categoryInfo.name = maybeFormatMessage(extensionInfo.name);
this._fillExtensionCategory(categoryInfo, extensionInfo);
this.emit(Runtime.BLOCKSINFO_UPDATE, categoryInfo);
}
}
/**
* Read extension information, convert menus, blocks and custom field types
* and store the results in the provided category object.
* @param {CategoryInfo} categoryInfo - the category to be filled
* @param {ExtensionMetadata} extensionInfo - the extension metadata to read
* @private
*/
_fillExtensionCategory (categoryInfo, extensionInfo) {
categoryInfo.blocks = [];
categoryInfo.customFieldTypes = {};
categoryInfo.menus = [];
categoryInfo.menuInfo = {};
for (const menuName in extensionInfo.menus) {
if (extensionInfo.menus.hasOwnProperty(menuName)) {
const menuInfo = extensionInfo.menus[menuName];
const convertedMenu = this._buildMenuForScratchBlocks(menuName, menuInfo, categoryInfo);
categoryInfo.menus.push(convertedMenu);
categoryInfo.menuInfo[menuName] = menuInfo;
}
}
for (const fieldTypeName in extensionInfo.customFieldTypes) {
if (extensionInfo.customFieldTypes.hasOwnProperty(fieldTypeName)) {
const fieldType = extensionInfo.customFieldTypes[fieldTypeName];
const fieldTypeInfo = this._buildCustomFieldInfo(
fieldTypeName,
fieldType,
extensionInfo.id,
categoryInfo
);
categoryInfo.customFieldTypes[fieldTypeName] = fieldTypeInfo;
}
}
for (const blockInfo of extensionInfo.blocks) {
try {
const convertedBlock = this._convertForScratchBlocks(blockInfo, categoryInfo);
categoryInfo.blocks.push(convertedBlock);
if (convertedBlock.json) {
const opcode = convertedBlock.json.type;
if (blockInfo.blockType !== BlockType.EVENT) {
this._primitives[opcode] = convertedBlock.info.func;
}
if (blockInfo.blockType === BlockType.EVENT || blockInfo.blockType === BlockType.HAT) {
this._hats[opcode] = {
edgeActivated: blockInfo.isEdgeActivated,
restartExistingThreads: blockInfo.shouldRestartExistingThreads
};
}
}
} catch (e) {
log.error('Error parsing block: ', {block: blockInfo, error: e});
}
}
}
/**
* Convert the given extension menu items into the scratch-blocks style of list of pairs.
* If the menu is dynamic (e.g. the passed in argument is a function), return the input unmodified.
* @param {object} menuItems - an array of menu items or a function to retrieve such an array
* @returns {object} - an array of 2 element arrays or the original input function
* @private
*/
_convertMenuItems (menuItems) {
if (typeof menuItems !== 'function') {
const extensionMessageContext = this.makeMessageContextForTarget();
return menuItems.map(item => {
const formattedItem = maybeFormatMessage(item, extensionMessageContext);
switch (typeof formattedItem) {
case 'string':
return [formattedItem, formattedItem];
case 'object':
return [maybeFormatMessage(item.text, extensionMessageContext), item.value];
default:
throw new Error(`Can't interpret menu item: ${JSON.stringify(item)}`);
}
});
}
return menuItems;
}
/**
* Build the scratch-blocks JSON for a menu. Note that scratch-blocks treats menus as a special kind of block.
* @param {string} menuName - the name of the menu
* @param {object} menuInfo - a description of this menu and its items
* @property {*} items - an array of menu items or a function to retrieve such an array
* @property {boolean} [acceptReporters] - if true, allow dropping reporters onto this menu
* @param {CategoryInfo} categoryInfo - the category for this block
* @returns {object} - a JSON-esque object ready for scratch-blocks' consumption
* @private
*/
_buildMenuForScratchBlocks (menuName, menuInfo, categoryInfo) {
const menuId = this._makeExtensionMenuId(menuName, categoryInfo.id);
const menuItems = this._convertMenuItems(menuInfo.items);
return {
json: {
message0: '%1',
type: menuId,
inputsInline: true,
output: 'String',
colour: categoryInfo.color1,
colourSecondary: categoryInfo.color2,
colourTertiary: categoryInfo.color3,
outputShape: menuInfo.acceptReporters ?
ScratchBlocksConstants.OUTPUT_SHAPE_ROUND : ScratchBlocksConstants.OUTPUT_SHAPE_SQUARE,
args0: [
{
type: 'field_dropdown',
name: menuName,
options: menuItems
}
]
}
};
}
_buildCustomFieldInfo (fieldName, fieldInfo, extensionId, categoryInfo) {
const extendedName = `${extensionId}_${fieldName}`;
return {
fieldName: fieldName,
extendedName: extendedName,
argumentTypeInfo: {
shadow: {
type: extendedName,
fieldName: `field_${extendedName}`
}
},
scratchBlocksDefinition: this._buildCustomFieldTypeForScratchBlocks(
extendedName,
fieldInfo.output,
fieldInfo.outputShape,
categoryInfo
),
fieldImplementation: fieldInfo.implementation
};
}
/**
* Build the scratch-blocks JSON needed for a fieldType.
* Custom field types need to be namespaced to the extension so that extensions can't interfere with each other
* @param {string} fieldName - The name of the field
* @param {string} output - The output of the field
* @param {number} outputShape - Shape of the field (from ScratchBlocksConstants)
* @param {object} categoryInfo - The category the field belongs to (Used to set its colors)
* @returns {object} - Object to be inserted into scratch-blocks
*/
_buildCustomFieldTypeForScratchBlocks (fieldName, output, outputShape, categoryInfo) {
return {
json: {
type: fieldName,
message0: '%1',
inputsInline: true,
output: output,
colour: categoryInfo.color1,
colourSecondary: categoryInfo.color2,
colourTertiary: categoryInfo.color3,
outputShape: outputShape,
args0: [
{
name: `field_${fieldName}`,
type: `field_${fieldName}`
}
]
}
};
}
/**
* Convert ExtensionBlockMetadata into data ready for scratch-blocks.
* @param {ExtensionBlockMetadata} blockInfo - the block info to convert
* @param {CategoryInfo} categoryInfo - the category for this block
* @returns {ConvertedBlockInfo} - the converted & original block information
* @private
*/
_convertForScratchBlocks (blockInfo, categoryInfo) {
if (blockInfo === '---') {
return this._convertSeparatorForScratchBlocks(blockInfo);
}
if (blockInfo.blockType === BlockType.BUTTON) {
return this._convertButtonForScratchBlocks(blockInfo);
}
return this._convertBlockForScratchBlocks(blockInfo, categoryInfo);
}
/**
* Convert ExtensionBlockMetadata into scratch-blocks JSON & XML, and generate a proxy function.
* @param {ExtensionBlockMetadata} blockInfo - the block to convert
* @param {CategoryInfo} categoryInfo - the category for this block
* @returns {ConvertedBlockInfo} - the converted & original block information
* @private
*/
_convertBlockForScratchBlocks (blockInfo, categoryInfo) {
const extendedOpcode = `${categoryInfo.id}_${blockInfo.opcode}`;
const blockJSON = {
type: extendedOpcode,
inputsInline: true,
category: categoryInfo.name,
colour: categoryInfo.color1,
colourSecondary: categoryInfo.color2,
colourTertiary: categoryInfo.color3
};
const context = {
// TODO: store this somewhere so that we can map args appropriately after translation.
// This maps an arg name to its relative position in the original (usually English) block text.
// When displaying a block in another language we'll need to run a `replace` action similar to the one
// below, but each `[ARG]` will need to be replaced with the number in this map.
argsMap: {},
blockJSON,
categoryInfo,
blockInfo,
inputList: []
};
// If an icon for the extension exists, prepend it to each block, with a vertical separator.
// We can overspecify an icon for each block, but if no icon exists on a block, fall back to
// the category block icon.
const iconURI = blockInfo.blockIconURI || categoryInfo.blockIconURI;
if (iconURI) {
blockJSON.extensions = ['scratch_extension'];
blockJSON.message0 = '%1 %2';
const iconJSON = {
type: 'field_image',
src: iconURI,
width: 40,
height: 40
};
const separatorJSON = {
type: 'field_vertical_separator'
};
blockJSON.args0 = [
iconJSON,
separatorJSON
];
}
switch (blockInfo.blockType) {
case BlockType.COMMAND:
blockJSON.outputShape = ScratchBlocksConstants.OUTPUT_SHAPE_SQUARE;
blockJSON.previousStatement = null; // null = available connection; undefined = hat
if (!blockInfo.isTerminal) {
blockJSON.nextStatement = null; // null = available connection; undefined = terminal
}
break;
case BlockType.REPORTER:
blockJSON.output = 'String'; // TODO: distinguish number & string here?
blockJSON.outputShape = ScratchBlocksConstants.OUTPUT_SHAPE_ROUND;
break;
case BlockType.BOOLEAN:
blockJSON.output = 'Boolean';
blockJSON.outputShape = ScratchBlocksConstants.OUTPUT_SHAPE_HEXAGONAL;
break;
case BlockType.HAT:
case BlockType.EVENT:
if (!blockInfo.hasOwnProperty('isEdgeActivated')) {
// if absent, this property defaults to true
blockInfo.isEdgeActivated = true;
}
blockJSON.outputShape = ScratchBlocksConstants.OUTPUT_SHAPE_SQUARE;
blockJSON.nextStatement = null; // null = available connection; undefined = terminal
break;
case BlockType.CONDITIONAL:
case BlockType.LOOP:
blockInfo.branchCount = blockInfo.branchCount || 1;
blockJSON.outputShape = ScratchBlocksConstants.OUTPUT_SHAPE_SQUARE;
blockJSON.previousStatement = null; // null = available connection; undefined = hat
if (!blockInfo.isTerminal) {
blockJSON.nextStatement = null; // null = available connection; undefined = terminal
}
break;
}
const blockText = Array.isArray(blockInfo.text) ? blockInfo.text : [blockInfo.text];
let inTextNum = 0; // text for the next block "arm" is blockText[inTextNum]
let inBranchNum = 0; // how many branches have we placed into the JSON so far?
let outLineNum = 0; // used for scratch-blocks `message${outLineNum}` and `args${outLineNum}`
const convertPlaceholders = this._convertPlaceholders.bind(this, context);
const extensionMessageContext = this.makeMessageContextForTarget();
// alternate between a block "arm" with text on it and an open slot for a substack
while (inTextNum < blockText.length || inBranchNum < blockInfo.branchCount) {
if (inTextNum < blockText.length) {
context.outLineNum = outLineNum;
const lineText = maybeFormatMessage(blockText[inTextNum], extensionMessageContext);
const convertedText = lineText.replace(/\[(.+?)]/g, convertPlaceholders);
if (blockJSON[`message${outLineNum}`]) {
blockJSON[`message${outLineNum}`] += convertedText;
} else {
blockJSON[`message${outLineNum}`] = convertedText;
}
++inTextNum;
++outLineNum;
}
if (inBranchNum < blockInfo.branchCount) {
blockJSON[`message${outLineNum}`] = '%1';
blockJSON[`args${outLineNum}`] = [{
type: 'input_statement',
name: `SUBSTACK${inBranchNum > 0 ? inBranchNum + 1 : ''}`
}];
++inBranchNum;
++outLineNum;
}
}
if (blockInfo.blockType === BlockType.REPORTER) {
if (!blockInfo.disableMonitor && context.inputList.length === 0) {
blockJSON.checkboxInFlyout = true;
}
} else if (blockInfo.blockType === BlockType.LOOP) {
// Add icon to the bottom right of a loop block
blockJSON[`lastDummyAlign${outLineNum}`] = 'RIGHT';
blockJSON[`message${outLineNum}`] = '%1';
blockJSON[`args${outLineNum}`] = [{
type: 'field_image',
src: './static/blocks-media/repeat.svg', // TODO: use a constant or make this configurable?
width: 24,
height: 24,
alt: '*', // TODO remove this since we don't use collapsed blocks in scratch
flip_rtl: true
}];
++outLineNum;
}
const mutation = blockInfo.isDynamic ? `<mutation blockInfo="${xmlEscape(JSON.stringify(blockInfo))}"/>` : '';
const inputs = context.inputList.join('');
const blockXML = `<block type="${extendedOpcode}">${mutation}${inputs}</block>`;
return {
info: context.blockInfo,
json: context.blockJSON,
xml: blockXML
};
}
/**
* Generate a separator between blocks categories or sub-categories.
* @param {ExtensionBlockMetadata} blockInfo - the block to convert
* @param {CategoryInfo} categoryInfo - the category for this block
* @returns {ConvertedBlockInfo} - the converted & original block information
* @private
*/
_convertSeparatorForScratchBlocks (blockInfo) {
return {
info: blockInfo,
xml: '<sep gap="36"/>'
};
}
/**
* Convert a button for scratch-blocks. A button has no opcode but specifies a callback name in the `func` field.
* @param {ExtensionBlockMetadata} buttonInfo - the button to convert
* @property {string} func - the callback name
* @param {CategoryInfo} categoryInfo - the category for this button
* @returns {ConvertedBlockInfo} - the converted & original button information
* @private
*/
_convertButtonForScratchBlocks (buttonInfo) {
// for now we only support these pre-defined callbacks handled in scratch-blocks
const supportedCallbackKeys = ['MAKE_A_LIST', 'MAKE_A_PROCEDURE', 'MAKE_A_VARIABLE'];
if (supportedCallbackKeys.indexOf(buttonInfo.func) < 0) {
log.error(`Custom button callbacks not supported yet: ${buttonInfo.func}`);
}
const extensionMessageContext = this.makeMessageContextForTarget();
const buttonText = maybeFormatMessage(buttonInfo.text, extensionMessageContext);
return {
info: buttonInfo,
xml: `<button text="${buttonText}" callbackKey="${buttonInfo.func}"></button>`
};
}
/**
* Helper for _convertPlaceholdes which handles inline images which are a specialized case of block "arguments".
* @param {object} argInfo Metadata about the inline image as specified by the extension
* @return {object} JSON blob for a scratch-blocks image field.
* @private
*/
_constructInlineImageJson (argInfo) {
if (!argInfo.dataURI) {
log.warn('Missing data URI in extension block with argument type IMAGE');
}
return {
type: 'field_image',
src: argInfo.dataURI || '',
// TODO these probably shouldn't be hardcoded...?
width: 24,
height: 24,
// Whether or not the inline image should be flipped horizontally
// in RTL languages. Defaults to false, indicating that the
// image will not be flipped.
flip_rtl: argInfo.flipRTL || false
};
}
/**
* Helper for _convertForScratchBlocks which handles linearization of argument placeholders. Called as a callback
* from string#replace. In addition to the return value the JSON and XML items in the context will be filled.
* @param {object} context - information shared with _convertForScratchBlocks about the block, etc.
* @param {string} match - the overall string matched by the placeholder regex, including brackets: '[FOO]'.
* @param {string} placeholder - the name of the placeholder being matched: 'FOO'.
* @return {string} scratch-blocks placeholder for the argument: '%1'.
* @private
*/
_convertPlaceholders (context, match, placeholder) {
// Sanitize the placeholder to ensure valid XML
placeholder = placeholder.replace(/[<"&]/, '_');
// Determine whether the argument type is one of the known standard field types
const argInfo = context.blockInfo.arguments[placeholder] || {};
let argTypeInfo = ArgumentTypeMap[argInfo.type] || {};
// Field type not a standard field type, see if extension has registered custom field type
if (!ArgumentTypeMap[argInfo.type] && context.categoryInfo.customFieldTypes[argInfo.type]) {
argTypeInfo = context.categoryInfo.customFieldTypes[argInfo.type].argumentTypeInfo;
}
// Start to construct the scratch-blocks style JSON defining how the block should be
// laid out
let argJSON;
// Most field types are inputs (slots on the block that can have other blocks plugged into them)
// check if this is not one of those cases. E.g. an inline image on a block.
if (argTypeInfo.fieldType === 'field_image') {
argJSON = this._constructInlineImageJson(argInfo);
} else {
// Construct input value
// Layout a block argument (e.g. an input slot on the block)
argJSON = {
type: 'input_value',
name: placeholder
};
const defaultValue =
typeof argInfo.defaultValue === 'undefined' ? '' :
xmlEscape(maybeFormatMessage(argInfo.defaultValue, this.makeMessageContextForTarget()).toString());
if (argTypeInfo.check) {
// Right now the only type of 'check' we have specifies that the
// input slot on the block accepts Boolean reporters, so it should be
// shaped like a hexagon
argJSON.check = argTypeInfo.check;
}
let valueName;
let shadowType;
let fieldName;
if (argInfo.menu) {
const menuInfo = context.categoryInfo.menuInfo[argInfo.menu];
if (menuInfo.acceptReporters) {
valueName = placeholder;
shadowType = this._makeExtensionMenuId(argInfo.menu, context.categoryInfo.id);
fieldName = argInfo.menu;
} else {
argJSON.type = 'field_dropdown';
argJSON.options = this._convertMenuItems(menuInfo.items);
valueName = null;
shadowType = null;
fieldName = placeholder;
}
} else {
valueName = placeholder;
shadowType = (argTypeInfo.shadow && argTypeInfo.shadow.type) || null;
fieldName = (argTypeInfo.shadow && argTypeInfo.shadow.fieldName) || null;
}
// <value> is the ScratchBlocks name for a block input.
if (valueName) {
context.inputList.push(`<value name="${placeholder}">`);
}
// The <shadow> is a placeholder for a reporter and is visible when there's no reporter in this input.
// Boolean inputs don't need to specify a shadow in the XML.
if (shadowType) {
context.inputList.push(`<shadow type="${shadowType}">`);
}
// A <field> displays a dynamic value: a user-editable text field, a drop-down menu, etc.
// Leave out the field if defaultValue or fieldName are not specified
if (defaultValue && fieldName) {
context.inputList.push(`<field name="${fieldName}">${defaultValue}</field>`);
}
if (shadowType) {
context.inputList.push('</shadow>');
}
if (valueName) {
context.inputList.push('</value>');
}
}
const argsName = `args${context.outLineNum}`;
const blockArgs = (context.blockJSON[argsName] = context.blockJSON[argsName] || []);
if (argJSON) blockArgs.push(argJSON);
const argNum = blockArgs.length;
context.argsMap[placeholder] = argNum;
return `%${argNum}`;
}
/**
* @returns {Array.<object>} scratch-blocks XML for each category of extension blocks, in category order.
* @param {?Target} [target] - the active editing target (optional)
* @property {string} id - the category / extension ID
* @property {string} xml - the XML text for this category, starting with `<category>` and ending with `</category>`
*/
getBlocksXML (target) {
return this._blockInfo.map(categoryInfo => {
const {name, color1, color2} = categoryInfo;
// Filter out blocks that aren't supposed to be shown on this target, as determined by the block info's
// `hideFromPalette` and `filter` properties.
const paletteBlocks = categoryInfo.blocks.filter(block => {
let blockFilterIncludesTarget = true;
// If an editing target is not passed, include all blocks
// If the block info doesn't include a `filter` property, always include it
if (target && block.info.filter) {
blockFilterIncludesTarget = block.info.filter.includes(
target.isStage ? TargetType.STAGE : TargetType.SPRITE
);
}
// If the block info's `hideFromPalette` is true, then filter out this block
return blockFilterIncludesTarget && !block.info.hideFromPalette;
});
const colorXML = `colour="${color1}" secondaryColour="${color2}"`;
// Use a menu icon if there is one. Otherwise, use the block icon. If there's no icon,
// the category menu will show its default colored circle.
let menuIconURI = '';
if (categoryInfo.menuIconURI) {
menuIconURI = categoryInfo.menuIconURI;
} else if (categoryInfo.blockIconURI) {
menuIconURI = categoryInfo.blockIconURI;
}
const menuIconXML = menuIconURI ?
`iconURI="${menuIconURI}"` : '';
let statusButtonXML = '';
if (categoryInfo.showStatusButton) {
statusButtonXML = 'showStatusButton="true"';
}
return {
id: categoryInfo.id,
xml: `<category name="${name}" id="${categoryInfo.id}" ${statusButtonXML} ${colorXML} ${menuIconXML}>${
paletteBlocks.map(block => block.xml).join('')}</category>`
};
});
}
/**
* @returns {Array.<string>} - an array containing the scratch-blocks JSON information for each dynamic block.
*/
getBlocksJSON () {
return this._blockInfo.reduce(
(result, categoryInfo) => result.concat(categoryInfo.blocks.map(blockInfo => blockInfo.json)), []);
}
/**
* Get a scratch link socket.
* @param {string} type Either BLE or BT
* @returns {ScratchLinkSocket} The scratch link socket.
*/
getScratchLinkSocket (type) {
const factory = this._linkSocketFactory || this._defaultScratchLinkSocketFactory;
return factory(type);
}
/**
* Configure how ScratchLink sockets are created. Factory must consume a "type" parameter
* either BT or BLE.
* @param {Function} factory The new factory for creating ScratchLink sockets.
*/
configureScratchLinkSocketFactory (factory) {
this._linkSocketFactory = factory;
}
/**
* The default scratch link socket creator, using websockets to the installed device manager.
* @param {string} type Either BLE or BT
* @returns {ScratchLinkSocket} The new scratch link socket (a WebSocket object)
*/
_defaultScratchLinkSocketFactory (type) {
return new ScratchLinkWebSocket(type);
}
/**
* Register an extension that communications with a hardware peripheral by id,
* to have access to it and its peripheral functions in the future.
* @param {string} extensionId - the id of the extension.
* @param {object} extension - the extension to register.
*/
registerPeripheralExtension (extensionId, extension) {
this.peripheralExtensions[extensionId] = extension;
}
/**
* Tell the specified extension to scan for a peripheral.
* @param {string} extensionId - the id of the extension.
*/
scanForPeripheral (extensionId) {
if (this.peripheralExtensions[extensionId]) {
this.peripheralExtensions[extensionId].scan();
}
}
/**
* Connect to the extension's specified peripheral.
* @param {string} extensionId - the id of the extension.
* @param {number} peripheralId - the id of the peripheral.
*/
connectPeripheral (extensionId, peripheralId) {
if (this.peripheralExtensions[extensionId]) {
this.peripheralExtensions[extensionId].connect(peripheralId);
}
}
/**
* Disconnect from the extension's connected peripheral.
* @param {string} extensionId - the id of the extension.
*/
disconnectPeripheral (extensionId) {
if (this.peripheralExtensions[extensionId]) {
this.peripheralExtensions[extensionId].disconnect();
}
}
/**
* Returns whether the extension has a currently connected peripheral.
* @param {string} extensionId - the id of the extension.
* @return {boolean} - whether the extension has a connected peripheral.
*/
getPeripheralIsConnected (extensionId) {
let isConnected = false;
if (this.peripheralExtensions[extensionId]) {
isConnected = this.peripheralExtensions[extensionId].isConnected();
}
return isConnected;
}
/**
* Emit an event to indicate that the microphone is being used to stream audio.
* @param {boolean} listening - true if the microphone is currently listening.
*/
emitMicListening (listening) {
this.emit(Runtime.MIC_LISTENING, listening);
}
/**
* Retrieve the function associated with the given opcode.
* @param {!string} opcode The opcode to look up.
* @return {Function} The function which implements the opcode.
*/
getOpcodeFunction (opcode) {
return this._primitives[opcode];
}
/**
* Return whether an opcode represents a hat block.
* @param {!string} opcode The opcode to look up.
* @return {boolean} True if the op is known to be a hat.
*/
getIsHat (opcode) {
return this._hats.hasOwnProperty(opcode);
}
/**
* Return whether an opcode represents an edge-activated hat block.
* @param {!string} opcode The opcode to look up.
* @return {boolean} True if the op is known to be a edge-activated hat.
*/
getIsEdgeActivatedHat (opcode) {
return this._hats.hasOwnProperty(opcode) &&
this._hats[opcode].edgeActivated;
}
/**
* Attach the audio engine
* @param {!AudioEngine} audioEngine The audio engine to attach
*/
attachAudioEngine (audioEngine) {
this.audioEngine = audioEngine;
}
/**
* Attach the renderer
* @param {!RenderWebGL} renderer The renderer to attach
*/
attachRenderer (renderer) {
this.renderer = renderer;
this.renderer.setLayerGroupOrdering(StageLayering.LAYER_GROUPS);
}
/**
* Set the bitmap adapter for the VM/runtime, which converts scratch 2
* bitmaps to scratch 3 bitmaps. (Scratch 3 bitmaps are all bitmap resolution 2)
* @param {!function} bitmapAdapter The adapter to attach
*/
attachV2BitmapAdapter (bitmapAdapter) {
this.v2BitmapAdapter = bitmapAdapter;
}
/**
* Attach the storage module
* @param {!ScratchStorage} storage The storage module to attach
*/
attachStorage (storage) {
this.storage = storage;
}
// -----------------------------------------------------------------------------
// -----------------------------------------------------------------------------
/**
* Create a thread and push it to the list of threads.
* @param {!string} id ID of block that starts the stack.
* @param {!Target} target Target to run thread on.
* @param {?object} opts optional arguments
* @param {?boolean} opts.stackClick true if the script was activated by clicking on the stack
* @param {?boolean} opts.updateMonitor true if the script should update a monitor value
* @return {!Thread} The newly created thread.
*/
_pushThread (id, target, opts) {
const thread = new Thread(id);
thread.target = target;
thread.stackClick = Boolean(opts && opts.stackClick);
thread.updateMonitor = Boolean(opts && opts.updateMonitor);
thread.blockContainer = thread.updateMonitor ?
this.monitorBlocks :
target.blocks;
thread.pushStack(id);
this.threads.push(thread);
return thread;
}
/**
* Stop a thread: stop running it immediately, and remove it from the thread list later.
* @param {!Thread} thread Thread object to remove from actives
*/
_stopThread (thread) {
// Mark the thread for later removal
thread.isKilled = true;
// Inform sequencer to stop executing that thread.
this.sequencer.retireThread(thread);
}
/**
* Restart a thread in place, maintaining its position in the list of threads.
* This is used by `startHats` to and is necessary to ensure 2.0-like execution order.
* Test project: https://scratch.mit.edu/projects/130183108/
* @param {!Thread} thread Thread object to restart.
* @return {Thread} The restarted thread.
*/
_restartThread (thread) {
const newThread = new Thread(thread.topBlock);
newThread.target = thread.target;
newThread.stackClick = thread.stackClick;
newThread.updateMonitor = thread.updateMonitor;
newThread.blockContainer = thread.blockContainer;
newThread.pushStack(thread.topBlock);
const i = this.threads.indexOf(thread);
if (i > -1) {
this.threads[i] = newThread;
return newThread;
}
this.threads.push(thread);
return thread;
}
/**
* Return whether a thread is currently active/running.
* @param {?Thread} thread Thread object to check.
* @return {boolean} True if the thread is active/running.
*/
isActiveThread (thread) {
return (
(
thread.stack.length > 0 &&
thread.status !== Thread.STATUS_DONE) &&
this.threads.indexOf(thread) > -1);
}
/**
* Return whether a thread is waiting for more information or done.
* @param {?Thread} thread Thread object to check.
* @return {boolean} True if the thread is waiting
*/
isWaitingThread (thread) {
return (
thread.status === Thread.STATUS_PROMISE_WAIT ||
thread.status === Thread.STATUS_YIELD_TICK ||
!this.isActiveThread(thread)
);
}
/**
* Toggle a script.
* @param {!string} topBlockId ID of block that starts the script.
* @param {?object} opts optional arguments to toggle script
* @param {?string} opts.target target ID for target to run script on. If not supplied, uses editing target.
* @param {?boolean} opts.stackClick true if the user activated the stack by clicking, false if not. This
* determines whether we show a visual report when turning on the script.
*/
toggleScript (topBlockId, opts) {
opts = Object.assign({
target: this._editingTarget,
stackClick: false
}, opts);
// Remove any existing thread.
for (let i = 0; i < this.threads.length; i++) {
// Toggling a script that's already running turns it off
if (this.threads[i].topBlock === topBlockId && this.threads[i].status !== Thread.STATUS_DONE) {
const blockContainer = opts.target.blocks;
const opcode = blockContainer.getOpcode(blockContainer.getBlock(topBlockId));
if (this.getIsEdgeActivatedHat(opcode) && this.threads[i].stackClick !== opts.stackClick) {
// Allow edge activated hat thread stack click to coexist with
// edge activated hat thread that runs every frame
continue;
}
this._stopThread(this.threads[i]);
return;
}
}
// Otherwise add it.
this._pushThread(topBlockId, opts.target, opts);
}
/**
* Enqueue a script that when finished will update the monitor for the block.
* @param {!string} topBlockId ID of block that starts the script.
* @param {?Target} optTarget target Target to run script on. If not supplied, uses editing target.
*/
addMonitorScript (topBlockId, optTarget) {
if (!optTarget) optTarget = this._editingTarget;
for (let i = 0; i < this.threads.length; i++) {
// Don't re-add the script if it's already running
if (this.threads[i].topBlock === topBlockId && this.threads[i].status !== Thread.STATUS_DONE &&
this.threads[i].updateMonitor) {
return;
}
}
// Otherwise add it.
this._pushThread(topBlockId, optTarget, {updateMonitor: true});
}
/**
* Run a function `f` for all scripts in a workspace.
* `f` will be called with two parameters:
* - the top block ID of the script.
* - the target that owns the script.
* @param {!Function} f Function to call for each script.
* @param {Target=} optTarget Optionally, a target to restrict to.
*/
allScriptsDo (f, optTarget) {
let targets = this.executableTargets;
if (optTarget) {
targets = [optTarget];
}
for (let t = targets.length - 1; t >= 0; t--) {
const target = targets[t];
const scripts = target.blocks.getScripts();
for (let j = 0; j < scripts.length; j++) {
const topBlockId = scripts[j];
f(topBlockId, target);
}
}
}
allScriptsByOpcodeDo (opcode, f, optTarget) {
let targets = this.executableTargets;
if (optTarget) {
targets = [optTarget];
}
for (let t = targets.length - 1; t >= 0; t--) {
const target = targets[t];
const scripts = BlocksRuntimeCache.getScripts(target.blocks, opcode);
for (let j = 0; j < scripts.length; j++) {
f(scripts[j], target);
}
}
}
/**
* Start all relevant hats.
* @param {!string} requestedHatOpcode Opcode of hats to start.
* @param {object=} optMatchFields Optionally, fields to match on the hat.
* @param {Target=} optTarget Optionally, a target to restrict to.
* @return {Array.<Thread>} List of threads started by this function.
*/
startHats (requestedHatOpcode,
optMatchFields, optTarget) {
if (!this._hats.hasOwnProperty(requestedHatOpcode)) {
// No known hat with this opcode.
return;
}
const instance = this;
const newThreads = [];
// Look up metadata for the relevant hat.
const hatMeta = instance._hats[requestedHatOpcode];
for (const opts in optMatchFields) {
if (!optMatchFields.hasOwnProperty(opts)) continue;
optMatchFields[opts] = optMatchFields[opts].toUpperCase();
}
// Consider all scripts, looking for hats with opcode `requestedHatOpcode`.
this.allScriptsByOpcodeDo(requestedHatOpcode, (script, target) => {
const {
blockId: topBlockId,
fieldsOfInputs: hatFields
} = script;
// Match any requested fields.
// For example: ensures that broadcasts match.
// This needs to happen before the block is evaluated
// (i.e., before the predicate can be run) because "broadcast and wait"
// needs to have a precise collection of started threads.
for (const matchField in optMatchFields) {
if (hatFields[matchField].value !== optMatchFields[matchField]) {
// Field mismatch.
return;
}
}
if (hatMeta.restartExistingThreads) {
// If `restartExistingThreads` is true, we should stop
// any existing threads starting with the top block.
for (let i = 0; i < this.threads.length; i++) {
if (this.threads[i].target === target &&
this.threads[i].topBlock === topBlockId &&
// stack click threads and hat threads can coexist
!this.threads[i].stackClick) {
newThreads.push(this._restartThread(this.threads[i]));
return;
}
}
} else {
// If `restartExistingThreads` is false, we should
// give up if any threads with the top block are running.
for (let j = 0; j < this.threads.length; j++) {
if (this.threads[j].target === target &&
this.threads[j].topBlock === topBlockId &&
// stack click threads and hat threads can coexist
!this.threads[j].stackClick &&
this.threads[j].status !== Thread.STATUS_DONE) {
// Some thread is already running.
return;
}
}
}
// Start the thread with this top block.
newThreads.push(this._pushThread(topBlockId, target));
}, optTarget);
// For compatibility with Scratch 2, edge triggered hats need to be processed before
// threads are stepped. See ScratchRuntime.as for original implementation
newThreads.forEach(thread => {
execute(this.sequencer, thread);
thread.goToNextBlock();
});
return newThreads;
}
/**
* Dispose all targets. Return to clean state.
*/
dispose () {
this.stopAll();
// Deleting each target's variable's monitors.
this.targets.forEach(target => {
if (target.isOriginal) target.deleteMonitors();
});
this.targets.map(this.disposeTarget, this);
this._monitorState = OrderedMap({});
this.emit(Runtime.RUNTIME_DISPOSED);
this.ioDevices.clock.resetProjectTimer();
// @todo clear out extensions? turboMode? etc.
// *********** Cloud *******************
// If the runtime currently has cloud data,
// emit a has cloud data update event resetting
// it to false
if (this.hasCloudData()) {
this.emit(Runtime.HAS_CLOUD_DATA_UPDATE, false);
}
this.ioDevices.cloud.clear();
// Reset runtime cloud data info
const newCloudDataManager = cloudDataManager();
this.hasCloudData = newCloudDataManager.hasCloudVariables;
this.canAddCloudVariable = newCloudDataManager.canAddCloudVariable;
this.addCloudVariable = this._initializeAddCloudVariable(newCloudDataManager);
this.removeCloudVariable = this._initializeRemoveCloudVariable(newCloudDataManager);
}
/**
* Add a target to the runtime. This tracks the sprite pane
* ordering of the target. The target still needs to be put
* into the correct execution order after calling this function.
* @param {Target} target target to add
*/
addTarget (target) {
this.targets.push(target);
this.executableTargets.push(target);
}
/**
* Move a target in the execution order by a relative amount.
*
* A positve number will make the target execute earlier. A negative number
* will make the target execute later in the order.
*
* @param {Target} executableTarget target to move
* @param {number} delta number of positions to move target by
* @returns {number} new position in execution order
*/
moveExecutable (executableTarget, delta) {
const oldIndex = this.executableTargets.indexOf(executableTarget);
this.executableTargets.splice(oldIndex, 1);
let newIndex = oldIndex + delta;
if (newIndex > this.executableTargets.length) {
newIndex = this.executableTargets.length;
}
if (newIndex <= 0) {
if (this.executableTargets.length > 0 && this.executableTargets[0].isStage) {
newIndex = 1;
} else {
newIndex = 0;
}
}
this.executableTargets.splice(newIndex, 0, executableTarget);
return newIndex;
}
/**
* Set a target to execute at a specific position in the execution order.
*
* Infinity will set the target to execute first. 0 will set the target to
* execute last (before the stage).
*
* @param {Target} executableTarget target to move
* @param {number} newIndex position in execution order to place the target
* @returns {number} new position in the execution order
*/
setExecutablePosition (executableTarget, newIndex) {
const oldIndex = this.executableTargets.indexOf(executableTarget);
return this.moveExecutable(executableTarget, newIndex - oldIndex);
}
/**
* Remove a target from the execution set.
* @param {Target} executableTarget target to remove
*/
removeExecutable (executableTarget) {
const oldIndex = this.executableTargets.indexOf(executableTarget);
if (oldIndex > -1) {
this.executableTargets.splice(oldIndex, 1);
}
}
/**
* Dispose of a target.
* @param {!Target} disposingTarget Target to dispose of.
*/
disposeTarget (disposingTarget) {
this.targets = this.targets.filter(target => {
if (disposingTarget !== target) return true;
// Allow target to do dispose actions.
target.dispose();
// Remove from list of targets.
return false;
});
}
/**
* Stop any threads acting on the target.
* @param {!Target} target Target to stop threads for.
* @param {Thread=} optThreadException Optional thread to skip.
*/
stopForTarget (target, optThreadException) {
// Emit stop event to allow blocks to clean up any state.
this.emit(Runtime.STOP_FOR_TARGET, target, optThreadException);
// Stop any threads on the target.
for (let i = 0; i < this.threads.length; i++) {
if (this.threads[i] === optThreadException) {
continue;
}
if (this.threads[i].target === target) {
this._stopThread(this.threads[i]);
}
}
}
/**
* Start all threads that start with the green flag.
*/
greenFlag () {
this.stopAll();
this.emit(Runtime.PROJECT_START);
this.ioDevices.clock.resetProjectTimer();
this.targets.forEach(target => target.clearEdgeActivatedValues());
// Inform all targets of the green flag.
for (let i = 0; i < this.targets.length; i++) {
this.targets[i].onGreenFlag();
}
this.startHats('event_whenflagclicked');
}
/**
* Stop "everything."
*/
stopAll () {
// Emit stop event to allow blocks to clean up any state.
this.emit(Runtime.PROJECT_STOP_ALL);
// Dispose all clones.
const newTargets = [];
for (let i = 0; i < this.targets.length; i++) {
this.targets[i].onStopAll();
if (this.targets[i].hasOwnProperty('isOriginal') &&
!this.targets[i].isOriginal) {
this.targets[i].dispose();
} else {
newTargets.push(this.targets[i]);
}
}
this.targets = newTargets;
// Dispose of the active thread.
if (this.sequencer.activeThread !== null) {
this._stopThread(this.sequencer.activeThread);
}
// Remove all remaining threads from executing in the next tick.
this.threads = [];
}
/**
* Repeatedly run `sequencer.stepThreads` and filter out
* inactive threads after each iteration.
*/
_step () {
if (this.profiler !== null) {
if (stepProfilerId === -1) {
stepProfilerId = this.profiler.idByName('Runtime._step');
}
this.profiler.start(stepProfilerId);
}
// Clean up threads that were told to stop during or since the last step
this.threads = this.threads.filter(thread => !thread.isKilled);
// Find all edge-activated hats, and add them to threads to be evaluated.
for (const hatType in this._hats) {
if (!this._hats.hasOwnProperty(hatType)) continue;
const hat = this._hats[hatType];
if (hat.edgeActivated) {
this.startHats(hatType);
}
}
this.redrawRequested = false;
this._pushMonitors();
if (this.profiler !== null) {
if (stepThreadsProfilerId === -1) {
stepThreadsProfilerId = this.profiler.idByName('Sequencer.stepThreads');
}
this.profiler.start(stepThreadsProfilerId);
}
const doneThreads = this.sequencer.stepThreads();
if (this.profiler !== null) {
this.profiler.stop();
}
this._updateGlows(doneThreads);
// Add done threads so that even if a thread finishes within 1 frame, the green
// flag will still indicate that a script ran.
this._emitProjectRunStatus(
this.threads.length + doneThreads.length -
this._getMonitorThreadCount([...this.threads, ...doneThreads]));
// Store threads that completed this iteration for testing and other
// internal purposes.
this._lastStepDoneThreads = doneThreads;
if (this.renderer) {
// @todo: Only render when this.redrawRequested or clones rendered.
if (this.profiler !== null) {
if (rendererDrawProfilerId === -1) {
rendererDrawProfilerId = this.profiler.idByName('RenderWebGL.draw');
}
this.profiler.start(rendererDrawProfilerId);
}
this.renderer.draw();
if (this.profiler !== null) {
this.profiler.stop();
}
}
if (this._refreshTargets) {
this.emit(Runtime.TARGETS_UPDATE, false /* Don't emit project changed */);
this._refreshTargets = false;
}
if (!this._prevMonitorState.equals(this._monitorState)) {
this.emit(Runtime.MONITORS_UPDATE, this._monitorState);
this._prevMonitorState = this._monitorState;
}
if (this.profiler !== null) {
this.profiler.stop();
this.profiler.reportFrames();
}
}
/**
* Get the number of threads in the given array that are monitor threads (threads
* that update monitor values, and don't count as running a script).
* @param {!Array.<Thread>} threads The set of threads to look through.
* @return {number} The number of monitor threads in threads.
*/
_getMonitorThreadCount (threads) {
let count = 0;
threads.forEach(thread => {
if (thread.updateMonitor) count++;
});
return count;
}
/**
* Queue monitor blocks to sequencer to be run.
*/
_pushMonitors () {
this.monitorBlocks.runAllMonitored(this);
}
/**
* Set the current editing target known by the runtime.
* @param {!Target} editingTarget New editing target.
*/
setEditingTarget (editingTarget) {
const oldEditingTarget = this._editingTarget;
this._editingTarget = editingTarget;
// Script glows must be cleared.
this._scriptGlowsPreviousFrame = [];
this._updateGlows();
if (oldEditingTarget !== this._editingTarget) {
this.requestToolboxExtensionsUpdate();
}
}
/**
* Set whether we are in 30 TPS compatibility mode.
* @param {boolean} compatibilityModeOn True iff in compatibility mode.
*/
setCompatibilityMode (compatibilityModeOn) {
this.compatibilityMode = compatibilityModeOn;
if (this._steppingInterval) {
clearInterval(this._steppingInterval);
this._steppingInterval = null;
this.start();
}
}
/**
* Emit glows/glow clears for scripts after a single tick.
* Looks at `this.threads` and notices which have turned on/off new glows.
* @param {Array.<Thread>=} optExtraThreads Optional list of inactive threads.
*/
_updateGlows (optExtraThreads) {
const searchThreads = [];
searchThreads.push.apply(searchThreads, this.threads);
if (optExtraThreads) {
searchThreads.push.apply(searchThreads, optExtraThreads);
}
// Set of scripts that request a glow this frame.
const requestedGlowsThisFrame = [];
// Final set of scripts glowing during this frame.
const finalScriptGlows = [];
// Find all scripts that should be glowing.
for (let i = 0; i < searchThreads.length; i++) {
const thread = searchThreads[i];
const target = thread.target;
if (target === this._editingTarget) {
const blockForThread = thread.blockGlowInFrame;
if (thread.requestScriptGlowInFrame || thread.stackClick) {
let script = target.blocks.getTopLevelScript(blockForThread);
if (!script) {
// Attempt to find in flyout blocks.
script = this.flyoutBlocks.getTopLevelScript(
blockForThread
);
}
if (script) {
requestedGlowsThisFrame.push(script);
}
}
}
}
// Compare to previous frame.
for (let j = 0; j < this._scriptGlowsPreviousFrame.length; j++) {
const previousFrameGlow = this._scriptGlowsPreviousFrame[j];
if (requestedGlowsThisFrame.indexOf(previousFrameGlow) < 0) {
// Glow turned off.
this.glowScript(previousFrameGlow, false);
} else {
// Still glowing.
finalScriptGlows.push(previousFrameGlow);
}
}
for (let k = 0; k < requestedGlowsThisFrame.length; k++) {
const currentFrameGlow = requestedGlowsThisFrame[k];
if (this._scriptGlowsPreviousFrame.indexOf(currentFrameGlow) < 0) {
// Glow turned on.
this.glowScript(currentFrameGlow, true);
finalScriptGlows.push(currentFrameGlow);
}
}
this._scriptGlowsPreviousFrame = finalScriptGlows;
}
/**
* Emit run start/stop after each tick. Emits when `this.threads.length` goes
* between non-zero and zero
*
* @param {number} nonMonitorThreadCount The new nonMonitorThreadCount
*/
_emitProjectRunStatus (nonMonitorThreadCount) {
if (this._nonMonitorThreadCount === 0 && nonMonitorThreadCount > 0) {
this.emit(Runtime.PROJECT_RUN_START);
}
if (this._nonMonitorThreadCount > 0 && nonMonitorThreadCount === 0) {
this.emit(Runtime.PROJECT_RUN_STOP);
}
this._nonMonitorThreadCount = nonMonitorThreadCount;
}
/**
* "Quiet" a script's glow: stop the VM from generating glow/unglow events
* about that script. Use when a script has just been deleted, but we may
* still be tracking glow data about it.
* @param {!string} scriptBlockId Id of top-level block in script to quiet.
*/
quietGlow (scriptBlockId) {
const index = this._scriptGlowsPreviousFrame.indexOf(scriptBlockId);
if (index > -1) {
this._scriptGlowsPreviousFrame.splice(index, 1);
}
}
/**
* Emit feedback for block glowing (used in the sequencer).
* @param {?string} blockId ID for the block to update glow
* @param {boolean} isGlowing True to turn on glow; false to turn off.
*/
glowBlock (blockId, isGlowing) {
if (isGlowing) {
this.emit(Runtime.BLOCK_GLOW_ON, {id: blockId});
} else {
this.emit(Runtime.BLOCK_GLOW_OFF, {id: blockId});
}
}
/**
* Emit feedback for script glowing.
* @param {?string} topBlockId ID for the top block to update glow
* @param {boolean} isGlowing True to turn on glow; false to turn off.
*/
glowScript (topBlockId, isGlowing) {
if (isGlowing) {
this.emit(Runtime.SCRIPT_GLOW_ON, {id: topBlockId});
} else {
this.emit(Runtime.SCRIPT_GLOW_OFF, {id: topBlockId});
}
}
/**
* Emit whether blocks are being dragged over gui
* @param {boolean} areBlocksOverGui True if blocks are dragged out of blocks workspace, false otherwise
*/
emitBlockDragUpdate (areBlocksOverGui) {
this.emit(Runtime.BLOCK_DRAG_UPDATE, areBlocksOverGui);
}
/**
* Emit event to indicate that the block drag has ended with the blocks outside the blocks workspace
* @param {Array.<object>} blocks The set of blocks dragged to the GUI
* @param {string} topBlockId The original id of the top block being dragged
*/
emitBlockEndDrag (blocks, topBlockId) {
this.emit(Runtime.BLOCK_DRAG_END, blocks, topBlockId);
}
/**
* Emit value for reporter to show in the blocks.
* @param {string} blockId ID for the block.
* @param {string} value Value to show associated with the block.
*/
visualReport (blockId, value) {
this.emit(Runtime.VISUAL_REPORT, {id: blockId, value: String(value)});
}
/**
* Add a monitor to the state. If the monitor already exists in the state,
* updates those properties that are defined in the given monitor record.
* @param {!MonitorRecord} monitor Monitor to add.
*/
requestAddMonitor (monitor) {
const id = monitor.get('id');
if (!this.requestUpdateMonitor(monitor)) { // update monitor if it exists in the state
// if the monitor did not exist in the state, add it
this._monitorState = this._monitorState.set(id, monitor);
}
}
/**
* Update a monitor in the state and report success/failure of update.
* @param {!Map} monitor Monitor values to update. Values on the monitor with overwrite
* values on the old monitor with the same ID. If a value isn't defined on the new monitor,
* the old monitor will keep its old value.
* @return {boolean} true if monitor exists in the state and was updated, false if it did not exist.
*/
requestUpdateMonitor (monitor) {
const id = monitor.get('id');
if (this._monitorState.has(id)) {
this._monitorState =
// Use mergeWith here to prevent undefined values from overwriting existing ones
this._monitorState.set(id, this._monitorState.get(id).mergeWith((prev, next) => {
if (typeof next === 'undefined' || next === null) {
return prev;
}
return next;
}, monitor));
return true;
}
return false;
}
/**
* Removes a monitor from the state. Does nothing if the monitor already does
* not exist in the state.
* @param {!string} monitorId ID of the monitor to remove.
*/
requestRemoveMonitor (monitorId) {
this._monitorState = this._monitorState.delete(monitorId);
}
/**
* Hides a monitor and returns success/failure of action.
* @param {!string} monitorId ID of the monitor to hide.
* @return {boolean} true if monitor exists and was updated, false otherwise
*/
requestHideMonitor (monitorId) {
return this.requestUpdateMonitor(new Map([
['id', monitorId],
['visible', false]
]));
}
/**
* Shows a monitor and returns success/failure of action.
* not exist in the state.
* @param {!string} monitorId ID of the monitor to show.
* @return {boolean} true if monitor exists and was updated, false otherwise
*/
requestShowMonitor (monitorId) {
return this.requestUpdateMonitor(new Map([
['id', monitorId],
['visible', true]
]));
}
/**
* Removes all monitors with the given target ID from the state. Does nothing if
* the monitor already does not exist in the state.
* @param {!string} targetId Remove all monitors with given target ID.
*/
requestRemoveMonitorByTargetId (targetId) {
this._monitorState = this._monitorState.filterNot(value => value.targetId === targetId);
}
/**
* Get a target by its id.
* @param {string} targetId Id of target to find.
* @return {?Target} The target, if found.
*/
getTargetById (targetId) {
for (let i = 0; i < this.targets.length; i++) {
const target = this.targets[i];
if (target.id === targetId) {
return target;
}
}
}
/**
* Get the first original (non-clone-block-created) sprite given a name.
* @param {string} spriteName Name of sprite to look for.
* @return {?Target} Target representing a sprite of the given name.
*/
getSpriteTargetByName (spriteName) {
for (let i = 0; i < this.targets.length; i++) {
const target = this.targets[i];
if (target.isStage) {
continue;
}
if (target.sprite && target.sprite.name === spriteName) {
return target;
}
}
}
/**
* Get a target by its drawable id.
* @param {number} drawableID drawable id of target to find
* @return {?Target} The target, if found
*/
getTargetByDrawableId (drawableID) {
for (let i = 0; i < this.targets.length; i++) {
const target = this.targets[i];
if (target.drawableID === drawableID) return target;
}
}
/**
* Update the clone counter to track how many clones are created.
* @param {number} changeAmount How many clones have been created/destroyed.
*/
changeCloneCounter (changeAmount) {
this._cloneCounter += changeAmount;
}
/**
* Return whether there are clones available.
* @return {boolean} True until the number of clones hits Runtime.MAX_CLONES.
*/
clonesAvailable () {
return this._cloneCounter < Runtime.MAX_CLONES;
}
/**
* Report that the project has loaded in the Virtual Machine.
*/
emitProjectLoaded () {
this.emit(Runtime.PROJECT_LOADED);
}
/**
* Report that the project has changed in a way that would affect serialization
*/
emitProjectChanged () {
this.emit(Runtime.PROJECT_CHANGED);
}
/**
* Report that a new target has been created, possibly by cloning an existing target.
* @param {Target} newTarget - the newly created target.
* @param {Target} [sourceTarget] - the target used as a source for the new clone, if any.
* @fires Runtime#targetWasCreated
*/
fireTargetWasCreated (newTarget, sourceTarget) {
this.emit('targetWasCreated', newTarget, sourceTarget);
}
/**
* Report that a clone target is being removed.
* @param {Target} target - the target being removed
* @fires Runtime#targetWasRemoved
*/
fireTargetWasRemoved (target) {
this.emit('targetWasRemoved', target);
}
/**
* Get a target representing the Scratch stage, if one exists.
* @return {?Target} The target, if found.
*/
getTargetForStage () {
for (let i = 0; i < this.targets.length; i++) {
const target = this.targets[i];
if (target.isStage) {
return target;
}
}
}
/**
* Get the editing target.
* @return {?Target} The editing target.
*/
getEditingTarget () {
return this._editingTarget;
}
getAllVarNamesOfType (varType) {
let varNames = [];
for (const target of this.targets) {
const targetVarNames = target.getAllVariableNamesInScopeByType(varType, true);
varNames = varNames.concat(targetVarNames);
}
return varNames;
}
/**
* Get the label or label function for an opcode
* @param {string} extendedOpcode - the opcode you want a label for
* @return {object} - object with label and category
* @property {string} category - the category for this opcode
* @property {Function} [labelFn] - function to generate the label for this opcode
* @property {string} [label] - the label for this opcode if `labelFn` is absent
*/
getLabelForOpcode (extendedOpcode) {
const [category, opcode] = StringUtil.splitFirst(extendedOpcode, '_');
if (!(category && opcode)) return;
const categoryInfo = this._blockInfo.find(ci => ci.id === category);
if (!categoryInfo) return;
const block = categoryInfo.blocks.find(b => b.info.opcode === opcode);
if (!block) return;
// TODO: we may want to format the label in a locale-specific way.
return {
category: 'extension', // This assumes that all extensions have the same monitor color.
label: `${categoryInfo.name}: ${block.info.text}`
};
}
/**
* Create a new global variable avoiding conflicts with other variable names.
* @param {string} variableName The desired variable name for the new global variable.
* This can be turned into a fresh name as necessary.
* @param {string} optVarId An optional ID to use for the variable. A new one will be generated
* if a falsey value for this parameter is provided.
* @param {string} optVarType The type of the variable to create. Defaults to Variable.SCALAR_TYPE.
* @return {Variable} The new variable that was created.
*/
createNewGlobalVariable (variableName, optVarId, optVarType) {
const varType = (typeof optVarType === 'string') ? optVarType : Variable.SCALAR_TYPE;
const allVariableNames = this.getAllVarNamesOfType(varType);
const newName = StringUtil.unusedName(variableName, allVariableNames);
const variable = new Variable(optVarId || uid(), newName, varType);
const stage = this.getTargetForStage();
stage.variables[variable.id] = variable;
return variable;
}
/**
* Tell the runtime to request a redraw.
* Use after a clone/sprite has completed some visible operation on the stage.
*/
requestRedraw () {
this.redrawRequested = true;
}
/**
* Emit a targets update at the end of the step if the provided target is
* the original sprite
* @param {!Target} target Target requesting the targets update
*/
requestTargetsUpdate (target) {
if (!target.isOriginal) return;
this._refreshTargets = true;
}
/**
* Emit an event that indicates that the blocks on the workspace need updating.
*/
requestBlocksUpdate () {
this.emit(Runtime.BLOCKS_NEED_UPDATE);
}
/**
* Emit an event that indicates that the toolbox extension blocks need updating.
*/
requestToolboxExtensionsUpdate () {
this.emit(Runtime.TOOLBOX_EXTENSIONS_NEED_UPDATE);
}
/**
* Set up timers to repeatedly step in a browser.
*/
start () {
// Do not start if we are already running
if (this._steppingInterval) return;
let interval = Runtime.THREAD_STEP_INTERVAL;
if (this.compatibilityMode) {
interval = Runtime.THREAD_STEP_INTERVAL_COMPATIBILITY;
}
this.currentStepTime = interval;
this._steppingInterval = setInterval(() => {
this._step();
}, interval);
this.emit(Runtime.RUNTIME_STARTED);
}
/**
* Turn on profiling.
* @param {Profiler/FrameCallback} onFrame A callback handle passed a
* profiling frame when the profiler reports its collected data.
*/
enableProfiling (onFrame) {
if (Profiler.available()) {
this.profiler = new Profiler(onFrame);
}
}
/**
* Turn off profiling.
*/
disableProfiling () {
this.profiler = null;
}
/**
* Update a millisecond timestamp value that is saved on the Runtime.
* This value is helpful in certain instances for compatibility with Scratch 2,
* which sometimes uses a `currentMSecs` timestamp value in Interpreter.as
*/
updateCurrentMSecs () {
this.currentMSecs = Date.now();
}
}
/**
* Event fired after a new target has been created, possibly by cloning an existing target.
*
* @event Runtime#targetWasCreated
* @param {Target} newTarget - the newly created target.
* @param {Target} [sourceTarget] - the target used as a source for the new clone, if any.
*/
module.exports = Runtime;
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