mirror of
https://github.com/scratchfoundation/scratch-vm.git
synced 2024-12-26 16:02:54 -05:00
148 lines
3.6 KiB
JavaScript
148 lines
3.6 KiB
JavaScript
var EventEmitter = require('events');
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var util = require('util');
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var Runtime = require('./engine/runtime');
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/**
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* Handles connections between blocks, stage, and extensions.
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*
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* @author Andrew Sliwinski <ascii@media.mit.edu>
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*/
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function VirtualMachine () {
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var instance = this;
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// Bind event emitter and runtime to VM instance
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EventEmitter.call(instance);
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instance.runtime = new Runtime();
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/**
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* Event listener for blockly. Handles validation and serves as a generic
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* adapter between the blocks and the runtime interface.
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*
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* @param {Object} Blockly "block" event
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*/
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instance.blockListener = function (e) {
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// Validate event
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if (typeof e !== 'object') return;
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if (typeof e.blockId !== 'string') return;
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// Blocks
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switch (e.type) {
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case 'create':
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instance.runtime.createBlock({
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id: e.blockId,
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opcode: e.xml.attributes.type.value
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});
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break;
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case 'move':
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instance.runtime.moveBlock({
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id: e.blockId,
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oldParent: e.oldParentId,
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oldInput: e.oldInputName,
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newParent: e.newParentId,
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newInput: e.newInputName
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});
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break;
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case 'change':
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instance.runtime.changeBlock({
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id: e.blockId
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});
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break;
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case 'delete':
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instance.runtime.deleteBlock({
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id: e.blockId
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});
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break;
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}
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};
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// @todo UI listener
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// @todo Forward runtime events
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// Event dispatcher
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// this.types = keymirror({
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// // Messages to runtime
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// CREATE_BLOCK: null,
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// MOVE_BLOCK: null,
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// CHANGE_BLOCK: null,
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// DELETE_BLOCK: null,
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//
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// ADD_DEVICE: null,
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// REMOVE_DEVICE: null,
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//
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// RUN_STRIP: null,
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// RUN_ALL_STRIPS: null,
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// STOP_ALL_STRIPS: null,
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// RUN_PALETTE_BLOCK: null,
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//
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// // Messages from runtime - subscribe to these
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// FEEDBACK_EXECUTING_BLOCK: null,
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// FEEDBACK_STOPPED_EXECUTING_BLOCK: null,
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// DEVICE_RUN_OP: null,
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// DEVICE_STOP_OP: null,
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//
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// // Tell back the interpreter device has finished an op
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// DEVICE_FINISHED_OP: null
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// });
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// Bind block event stream
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// setTimeout(function () {
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// _this.emit('foo', 'bar');
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// }, 1000);
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}
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/**
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* Inherit from EventEmitter
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*/
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util.inherits(VirtualMachine, EventEmitter);
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// VirtualMachine.prototype.changeListener = function (e) {
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// var _this = this;
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// console.dir(this);
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//
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// switch (e.type) {
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// case 'create':
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// console.dir(e);
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// _this.runtime.createBlock(
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// e.blockId,
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// event.xml.attributes.type.value
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// );
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// break;
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// case 'change':
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// // @todo
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// break;
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// case 'move':
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// // @todo
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// break;
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// case 'delete':
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// // @todo
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// break;
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// }
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// };
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//
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// VirtualMachine.prototype.tapListener = function (e) {
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// // @todo
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// };
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VirtualMachine.prototype.start = function () {
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this.runtime.runAllGreenFlags();
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};
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VirtualMachine.prototype.stop = function () {
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this.runtime.stop();
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};
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VirtualMachine.prototype.save = function () {
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// @todo Serialize runtime state
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};
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VirtualMachine.prototype.load = function () {
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// @todo Deserialize and apply runtime state
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};
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/**
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* Export and bind to `window`
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*/
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module.exports = VirtualMachine;
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if (typeof window !== 'undefined') window.VirtualMachine = module.exports;
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