mirror of
https://github.com/scratchfoundation/scratch-vm.git
synced 2024-12-26 07:52:50 -05:00
1125 lines
47 KiB
JavaScript
1125 lines
47 KiB
JavaScript
/**
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* @fileoverview
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* Partial implementation of an SB2 JSON importer.
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* Parses provided JSON and then generates all needed
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* scratch-vm runtime structures.
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*/
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const Blocks = require('../engine/blocks');
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const RenderedTarget = require('../sprites/rendered-target');
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const Sprite = require('../sprites/sprite');
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const Color = require('../util/color');
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const log = require('../util/log');
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const uid = require('../util/uid');
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const StringUtil = require('../util/string-util');
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const specMap = require('./sb2_specmap');
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const Comment = require('../engine/comment');
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const Variable = require('../engine/variable');
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const MonitorRecord = require('../engine/monitor-record');
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const StageLayering = require('../engine/stage-layering');
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const {loadCostume} = require('../import/load-costume.js');
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const {loadSound} = require('../import/load-sound.js');
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const {deserializeCostume, deserializeSound} = require('./deserialize-assets.js');
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// Constants used during deserialization of an SB2 file
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const CORE_EXTENSIONS = [
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'argument',
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'control',
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'data',
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'event',
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'looks',
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'math',
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'motion',
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'operator',
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'procedures',
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'sensing',
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'sound'
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];
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// Adjust script coordinates to account for
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// larger block size in scratch-blocks.
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// @todo: Determine more precisely the right formulas here.
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const WORKSPACE_X_SCALE = 1.5;
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const WORKSPACE_Y_SCALE = 2.2;
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/**
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* Convert a Scratch 2.0 procedure string (e.g., "my_procedure %s %b %n")
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* into an argument map. This allows us to provide the expected inputs
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* to a mutated procedure call.
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* @param {string} procCode Scratch 2.0 procedure string.
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* @return {object} Argument map compatible with those in sb2specmap.
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*/
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const parseProcedureArgMap = function (procCode) {
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const argMap = [
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{} // First item in list is op string.
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];
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const INPUT_PREFIX = 'input';
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let inputCount = 0;
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// Split by %n, %b, %s.
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const parts = procCode.split(/(?=[^\\]%[nbs])/);
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for (let i = 0; i < parts.length; i++) {
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const part = parts[i].trim();
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if (part.substring(0, 1) === '%') {
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const argType = part.substring(1, 2);
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const arg = {
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type: 'input',
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inputName: INPUT_PREFIX + (inputCount++)
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};
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if (argType === 'n') {
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arg.inputOp = 'math_number';
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} else if (argType === 's') {
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arg.inputOp = 'text';
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} else if (argType === 'b') {
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arg.inputOp = 'boolean';
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}
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argMap.push(arg);
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}
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}
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return argMap;
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};
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/**
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* Generate a list of "argument IDs" for procdefs and caller mutations.
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* IDs just end up being `input0`, `input1`, ... which is good enough.
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* @param {string} procCode Scratch 2.0 procedure string.
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* @return {Array.<string>} Array of argument id strings.
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*/
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const parseProcedureArgIds = function (procCode) {
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return parseProcedureArgMap(procCode)
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.map(arg => arg.inputName)
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.filter(name => name); // Filter out unnamed inputs which are labels
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};
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/**
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* Flatten a block tree into a block list.
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* Children are temporarily stored on the `block.children` property.
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* @param {Array.<object>} blocks list generated by `parseBlockList`.
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* @return {Array.<object>} Flattened list to be passed to `blocks.createBlock`.
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*/
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const flatten = function (blocks) {
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let finalBlocks = [];
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for (let i = 0; i < blocks.length; i++) {
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const block = blocks[i];
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finalBlocks.push(block);
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if (block.children) {
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finalBlocks = finalBlocks.concat(flatten(block.children));
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}
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delete block.children;
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}
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return finalBlocks;
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};
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/**
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* Parse any list of blocks from SB2 JSON into a list of VM-format blocks.
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* Could be used to parse a top-level script,
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* a list of blocks in a branch (e.g., in forever),
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* or a list of blocks in an argument (e.g., move [pick random...]).
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* @param {Array.<object>} blockList SB2 JSON-format block list.
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* @param {Function} addBroadcastMsg function to update broadcast message name map
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* @param {Function} getVariableId function to retreive a variable's ID based on name
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* @param {ImportedExtensionsInfo} extensions - (in/out) parsed extension information will be stored here.
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* @param {ParseState} parseState - info on the state of parsing beyond the current block.
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* @param {object<int, Comment>} comments - Comments from sb2 project that need to be attached to blocks.
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* They are indexed in this object by the sb2 flattened block list index indicating
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* which block they should attach to.
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* @param {int} commentIndex The current index of the top block in this list if it were in a flattened
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* list of all blocks for the target
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* @return {Array<Array.<object>|int>} Tuple where first item is the Scratch VM-format block list, and
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* second item is the updated comment index
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*/
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const parseBlockList = function (blockList, addBroadcastMsg, getVariableId, extensions, parseState, comments,
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commentIndex) {
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const resultingList = [];
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let previousBlock = null; // For setting next.
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for (let i = 0; i < blockList.length; i++) {
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const block = blockList[i];
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// eslint-disable-next-line no-use-before-define
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const parsedBlockAndComments = parseBlock(block, addBroadcastMsg, getVariableId,
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extensions, parseState, comments, commentIndex);
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const parsedBlock = parsedBlockAndComments[0];
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// Update commentIndex
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commentIndex = parsedBlockAndComments[1];
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if (!parsedBlock) continue;
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if (previousBlock) {
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parsedBlock.parent = previousBlock.id;
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previousBlock.next = parsedBlock.id;
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}
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previousBlock = parsedBlock;
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resultingList.push(parsedBlock);
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}
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return [resultingList, commentIndex];
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};
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/**
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* Parse a Scratch object's scripts into VM blocks.
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* This should only handle top-level scripts that include X, Y coordinates.
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* @param {!object} scripts Scripts object from SB2 JSON.
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* @param {!Blocks} blocks Blocks object to load parsed blocks into.
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* @param {Function} addBroadcastMsg function to update broadcast message name map
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* @param {Function} getVariableId function to retreive a variable's ID based on name
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* @param {ImportedExtensionsInfo} extensions - (in/out) parsed extension information will be stored here.
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* @param {object} comments Comments that need to be attached to the blocks that need to be parsed
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*/
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const parseScripts = function (scripts, blocks, addBroadcastMsg, getVariableId, extensions, comments) {
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// Keep track of the index of the current script being
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// parsed in order to attach block comments correctly
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let scriptIndexForComment = 0;
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for (let i = 0; i < scripts.length; i++) {
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const script = scripts[i];
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const scriptX = script[0];
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const scriptY = script[1];
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const blockList = script[2];
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const parseState = {};
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const [parsedBlockList, newCommentIndex] = parseBlockList(blockList, addBroadcastMsg, getVariableId, extensions,
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parseState, comments, scriptIndexForComment);
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scriptIndexForComment = newCommentIndex;
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if (parsedBlockList[0]) {
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parsedBlockList[0].x = scriptX * WORKSPACE_X_SCALE;
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parsedBlockList[0].y = scriptY * WORKSPACE_Y_SCALE;
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parsedBlockList[0].topLevel = true;
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parsedBlockList[0].parent = null;
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}
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// Flatten children and create add the blocks.
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const convertedBlocks = flatten(parsedBlockList);
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for (let j = 0; j < convertedBlocks.length; j++) {
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blocks.createBlock(convertedBlocks[j]);
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}
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}
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};
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/**
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* Create a callback for assigning fixed IDs to imported variables
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* Generator stores the global variable mapping in a closure
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* @param {!string} targetId the id of the target to scope the variable to
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* @return {string} variable ID
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*/
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const generateVariableIdGetter = (function () {
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let globalVariableNameMap = {};
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const namer = (targetId, name, type) => `${targetId}-${name}-${type}`;
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return function (targetId, topLevel) {
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// Reset the global variable map if topLevel
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if (topLevel) globalVariableNameMap = {};
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return function (name, type) {
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if (topLevel) { // Store the name/id pair in the globalVariableNameMap
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globalVariableNameMap[`${name}-${type}`] = namer(targetId, name, type);
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return globalVariableNameMap[`${name}-${type}`];
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}
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// Not top-level, so first check the global name map
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if (globalVariableNameMap[`${name}-${type}`]) return globalVariableNameMap[`${name}-${type}`];
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return namer(targetId, name, type);
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};
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};
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}());
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const globalBroadcastMsgStateGenerator = (function () {
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let broadcastMsgNameMap = {};
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const allBroadcastFields = [];
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const emptyStringName = uid();
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return function (topLevel) {
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if (topLevel) broadcastMsgNameMap = {};
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return {
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broadcastMsgMapUpdater: function (name, field) {
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name = name.toLowerCase();
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if (name === '') {
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name = emptyStringName;
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}
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broadcastMsgNameMap[name] = `broadcastMsgId-${name}`;
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allBroadcastFields.push(field);
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return broadcastMsgNameMap[name];
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},
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globalBroadcastMsgs: broadcastMsgNameMap,
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allBroadcastFields: allBroadcastFields,
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emptyMsgName: emptyStringName
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};
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};
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}());
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/**
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* Parse a single monitor object and create all its in-memory VM objects.
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* @param {!object} object - From-JSON "Monitor object"
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* @param {!Runtime} runtime - (in/out) Runtime object to load monitor info into.
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* @param {!Array.<Target>} targets - Targets have already been parsed.
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* @param {ImportedExtensionsInfo} extensions - (in/out) parsed extension information will be stored here.
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*/
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const parseMonitorObject = (object, runtime, targets, extensions) => {
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let target = null;
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// List blocks don't come in with their target name set.
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// Find the target by searching for a target with matching variable name/type.
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if (!object.hasOwnProperty('target')) {
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for (let i = 0; i < targets.length; i++) {
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const currTarget = targets[i];
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const listVariables = Object.keys(currTarget.variables).filter(key => {
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const variable = currTarget.variables[key];
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return variable.type === Variable.LIST_TYPE && variable.name === object.listName;
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});
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if (listVariables.length > 0) {
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target = currTarget; // Keep this target for later use
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object.target = currTarget.getName(); // Set target name to normalize with other monitors
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}
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}
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}
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// Get the target for this monitor, if not gotten above.
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target = target || targets.filter(t => t.getName() === object.target)[0];
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if (!target) throw new Error('Cannot create monitor for target that cannot be found by name');
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// Create var id getter to make block naming/parsing easier, variables already created.
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const getVariableId = generateVariableIdGetter(target.id, false);
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// eslint-disable-next-line no-use-before-define
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const [block, _] = parseBlock(
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[object.cmd, object.param], // Scratch 2 monitor blocks only have one param.
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null, // `addBroadcastMsg`, not needed for monitor blocks.
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getVariableId,
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extensions,
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{},
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null, // `comments`, not needed for monitor blocks
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null // `commentIndex`, not needed for monitor blocks
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);
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// Monitor blocks have special IDs to match the toolbox obtained from the getId
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// function in the runtime.monitorBlocksInfo. Variable monitors, however,
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// get their IDs from the variable id they reference.
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if (object.cmd === 'getVar:') {
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block.id = getVariableId(object.param, Variable.SCALAR_TYPE);
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} else if (object.cmd === 'contentsOfList:') {
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block.id = getVariableId(object.param, Variable.LIST_TYPE);
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} else if (runtime.monitorBlockInfo.hasOwnProperty(block.opcode)) {
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block.id = runtime.monitorBlockInfo[block.opcode].getId(target.id, object.param);
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}
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// Block needs a targetId if it is targetting something other than the stage
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block.targetId = target.isStage ? null : target.id;
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// Property required for running monitored blocks.
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block.isMonitored = object.visible;
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// Blocks can be created with children, flatten and add to monitorBlocks.
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const newBlocks = flatten([block]);
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for (let i = 0; i < newBlocks.length; i++) {
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runtime.monitorBlocks.createBlock(newBlocks[i]);
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}
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// Convert numbered mode into strings for better understandability.
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switch (object.mode) {
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case 1:
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object.mode = 'default';
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break;
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case 2:
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object.mode = 'large';
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break;
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case 3:
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object.mode = 'slider';
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break;
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}
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// Create a monitor record for the runtime's monitorState
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runtime.requestAddMonitor(MonitorRecord({
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id: block.id,
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targetId: block.targetId,
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spriteName: block.targetId ? object.target : null,
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opcode: block.opcode,
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params: runtime.monitorBlocks._getBlockParams(block),
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value: '',
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mode: object.mode,
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sliderMin: object.sliderMin,
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sliderMax: object.sliderMax,
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x: object.x,
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y: object.y,
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width: object.width,
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height: object.height,
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visible: object.visible
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}));
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};
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/**
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* Parse a single "Scratch object" and create all its in-memory VM objects.
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* TODO: parse the "info" section, especially "savedExtensions"
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* @param {!object} object - From-JSON "Scratch object:" sprite, stage, watcher.
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* @param {!Runtime} runtime - Runtime object to load all structures into.
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* @param {ImportedExtensionsInfo} extensions - (in/out) parsed extension information will be stored here.
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* @param {boolean} topLevel - Whether this is the top-level object (stage).
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* @param {?object} zip - Optional zipped assets for local file import
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* @return {!Promise.<Array.<Target>>} Promise for the loaded targets when ready, or null for unsupported objects.
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*/
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const parseScratchObject = function (object, runtime, extensions, topLevel, zip) {
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if (!object.hasOwnProperty('objName')) {
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if (object.hasOwnProperty('listName')) {
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// Shim these objects so they can be processed as monitors
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object.cmd = 'contentsOfList:';
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object.param = object.listName;
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object.mode = 'list';
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}
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// Defer parsing monitors until targets are all parsed
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object.deferredMonitor = true;
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return Promise.resolve(object);
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}
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// Blocks container for this object.
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const blocks = new Blocks();
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// @todo: For now, load all Scratch objects (stage/sprites) as a Sprite.
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const sprite = new Sprite(blocks, runtime);
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// Sprite/stage name from JSON.
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if (object.hasOwnProperty('objName')) {
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if (topLevel && object.objName !== 'Stage') {
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for (const child of object.children) {
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if (!child.hasOwnProperty('objName') && child.target === object.objName) {
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child.target = 'Stage';
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}
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}
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object.objName = 'Stage';
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}
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sprite.name = object.objName;
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}
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// Costumes from JSON.
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const costumePromises = [];
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if (object.hasOwnProperty('costumes')) {
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for (let i = 0; i < object.costumes.length; i++) {
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const costumeSource = object.costumes[i];
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const bitmapResolution = costumeSource.bitmapResolution || 1;
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const costume = {
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name: costumeSource.costumeName,
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bitmapResolution: bitmapResolution,
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rotationCenterX: topLevel ? 240 * bitmapResolution : costumeSource.rotationCenterX,
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rotationCenterY: topLevel ? 180 * bitmapResolution : costumeSource.rotationCenterY,
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// TODO we eventually want this next property to be called
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// md5ext to reflect what it actually contains, however this
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// will be a very extensive change across many repositories
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// and should be done carefully and altogether
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md5: costumeSource.baseLayerMD5,
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skinId: null
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};
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const md5ext = costumeSource.baseLayerMD5;
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const idParts = StringUtil.splitFirst(md5ext, '.');
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const md5 = idParts[0];
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const ext = idParts[1].toLowerCase();
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costume.dataFormat = ext;
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costume.assetId = md5;
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// If there is no internet connection, or if the asset is not in storage
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// for some reason, and we are doing a local .sb2 import, (e.g. zip is provided)
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// the file name of the costume should be the baseLayerID followed by the file ext
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const assetFileName = `${costumeSource.baseLayerID}.${ext}`;
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costumePromises.push(deserializeCostume(costume, runtime, zip, assetFileName)
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.then(() => loadCostume(costume.md5, costume, runtime, 2 /* optVersion */)));
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}
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}
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// Sounds from JSON
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const soundPromises = [];
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if (object.hasOwnProperty('sounds')) {
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for (let s = 0; s < object.sounds.length; s++) {
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const soundSource = object.sounds[s];
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const sound = {
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name: soundSource.soundName,
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format: soundSource.format,
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rate: soundSource.rate,
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sampleCount: soundSource.sampleCount,
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// TODO we eventually want this next property to be called
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// md5ext to reflect what it actually contains, however this
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// will be a very extensive change across many repositories
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// and should be done carefully and altogether
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// (for example, the audio engine currently relies on this
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// property to be named 'md5')
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md5: soundSource.md5,
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data: null
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};
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const md5ext = soundSource.md5;
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const idParts = StringUtil.splitFirst(md5ext, '.');
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const md5 = idParts[0];
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const ext = idParts[1].toLowerCase();
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sound.dataFormat = ext;
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sound.assetId = md5;
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// If there is no internet connection, or if the asset is not in storage
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// for some reason, and we are doing a local .sb2 import, (e.g. zip is provided)
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// the file name of the sound should be the soundID (provided from the project.json)
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// followed by the file ext
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const assetFileName = `${soundSource.soundID}.${ext}`;
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soundPromises.push(deserializeSound(sound, runtime, zip, assetFileName)
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.then(() => loadSound(sound, runtime, sprite)));
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}
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}
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// Create the first clone, and load its run-state from JSON.
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const target = sprite.createClone(topLevel ? StageLayering.BACKGROUND_LAYER : StageLayering.SPRITE_LAYER);
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const getVariableId = generateVariableIdGetter(target.id, topLevel);
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const globalBroadcastMsgObj = globalBroadcastMsgStateGenerator(topLevel);
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const addBroadcastMsg = globalBroadcastMsgObj.broadcastMsgMapUpdater;
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// Load target properties from JSON.
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if (object.hasOwnProperty('variables')) {
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for (let j = 0; j < object.variables.length; j++) {
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const variable = object.variables[j];
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const newVariable = new Variable(
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getVariableId(variable.name, Variable.SCALAR_TYPE),
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variable.name,
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Variable.SCALAR_TYPE,
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variable.isPersistent
|
|
);
|
|
newVariable.value = variable.value;
|
|
target.variables[newVariable.id] = newVariable;
|
|
}
|
|
}
|
|
|
|
// If included, parse any and all comments on the object (this includes top-level
|
|
// workspace comments as well as comments attached to specific blocks)
|
|
const blockComments = {};
|
|
if (object.hasOwnProperty('scriptComments')) {
|
|
const comments = object.scriptComments.map(commentDesc => {
|
|
const [
|
|
commentX,
|
|
commentY,
|
|
commentWidth,
|
|
commentHeight,
|
|
commentFullSize,
|
|
flattenedBlockIndex,
|
|
commentText
|
|
] = commentDesc;
|
|
const isBlockComment = commentDesc[5] >= 0;
|
|
const newComment = new Comment(
|
|
null, // generate a new id for this comment
|
|
commentText, // text content of sb2 comment
|
|
// Only serialize x & y position of comment if it's a workspace comment
|
|
// If it's a block comment, we'll let scratch-blocks handle positioning
|
|
isBlockComment ? null : commentX * WORKSPACE_X_SCALE,
|
|
isBlockComment ? null : commentY * WORKSPACE_Y_SCALE,
|
|
commentWidth * WORKSPACE_X_SCALE,
|
|
commentHeight * WORKSPACE_Y_SCALE,
|
|
!commentFullSize
|
|
);
|
|
if (isBlockComment) {
|
|
// commentDesc[5] refers to the index of the block that this
|
|
// comment is attached to -- in a flattened version of the
|
|
// scripts array.
|
|
// If commentDesc[5] is -1, this is a workspace comment (we don't need to do anything
|
|
// extra at this point), otherwise temporarily save the flattened script array
|
|
// index as the blockId property of the new comment. We will
|
|
// change this to refer to the actual block id of the corresponding
|
|
// block when that block gets created
|
|
newComment.blockId = flattenedBlockIndex;
|
|
// Add this comment to the block comments object with its script index
|
|
// as the key
|
|
if (blockComments.hasOwnProperty(flattenedBlockIndex)) {
|
|
blockComments[flattenedBlockIndex].push(newComment);
|
|
} else {
|
|
blockComments[flattenedBlockIndex] = [newComment];
|
|
}
|
|
}
|
|
return newComment;
|
|
});
|
|
|
|
// Add all the comments that were just created to the target.comments,
|
|
// referenced by id
|
|
comments.forEach(comment => {
|
|
target.comments[comment.id] = comment;
|
|
});
|
|
}
|
|
|
|
// If included, parse any and all scripts/blocks on the object.
|
|
if (object.hasOwnProperty('scripts')) {
|
|
parseScripts(object.scripts, blocks, addBroadcastMsg, getVariableId, extensions, blockComments);
|
|
}
|
|
|
|
// If there are any comments referring to a numerical block ID, make them
|
|
// workspace comments. These are comments that were originally created as
|
|
// block comments, detached from the block, and then had the associated
|
|
// block deleted.
|
|
// These comments should be imported as workspace comments
|
|
// by making their blockIDs (which currently refer to non-existing blocks)
|
|
// null (See #1452).
|
|
for (const commentIndex in blockComments) {
|
|
const currBlockComments = blockComments[commentIndex];
|
|
currBlockComments.forEach(c => {
|
|
if (typeof c.blockId === 'number') {
|
|
c.blockId = null;
|
|
}
|
|
});
|
|
}
|
|
|
|
// Update stage specific blocks (e.g. sprite clicked <=> stage clicked)
|
|
blocks.updateTargetSpecificBlocks(topLevel); // topLevel = isStage
|
|
|
|
if (object.hasOwnProperty('lists')) {
|
|
for (let k = 0; k < object.lists.length; k++) {
|
|
const list = object.lists[k];
|
|
const newVariable = new Variable(
|
|
getVariableId(list.listName, Variable.LIST_TYPE),
|
|
list.listName,
|
|
Variable.LIST_TYPE,
|
|
false
|
|
);
|
|
newVariable.value = list.contents;
|
|
target.variables[newVariable.id] = newVariable;
|
|
}
|
|
}
|
|
if (object.hasOwnProperty('scratchX')) {
|
|
target.x = object.scratchX;
|
|
}
|
|
if (object.hasOwnProperty('scratchY')) {
|
|
target.y = object.scratchY;
|
|
}
|
|
if (object.hasOwnProperty('direction')) {
|
|
target.direction = object.direction;
|
|
}
|
|
if (object.hasOwnProperty('isDraggable')) {
|
|
target.draggable = object.isDraggable;
|
|
}
|
|
if (object.hasOwnProperty('scale')) {
|
|
// SB2 stores as 1.0 = 100%; we use % in the VM.
|
|
target.size = object.scale * 100;
|
|
}
|
|
if (object.hasOwnProperty('visible')) {
|
|
target.visible = object.visible;
|
|
}
|
|
if (object.hasOwnProperty('currentCostumeIndex')) {
|
|
target.currentCostume = Math.round(object.currentCostumeIndex);
|
|
}
|
|
if (object.hasOwnProperty('rotationStyle')) {
|
|
if (object.rotationStyle === 'none') {
|
|
target.rotationStyle = RenderedTarget.ROTATION_STYLE_NONE;
|
|
} else if (object.rotationStyle === 'leftRight') {
|
|
target.rotationStyle = RenderedTarget.ROTATION_STYLE_LEFT_RIGHT;
|
|
} else if (object.rotationStyle === 'normal') {
|
|
target.rotationStyle = RenderedTarget.ROTATION_STYLE_ALL_AROUND;
|
|
}
|
|
}
|
|
if (object.hasOwnProperty('tempoBPM')) {
|
|
target.tempo = object.tempoBPM;
|
|
}
|
|
if (object.hasOwnProperty('videoAlpha')) {
|
|
// SB2 stores alpha as opacity, where 1.0 is opaque.
|
|
// We convert to a percentage, and invert it so 100% is full transparency.
|
|
target.videoTransparency = 100 - (100 * object.videoAlpha);
|
|
}
|
|
if (object.hasOwnProperty('info')) {
|
|
if (object.info.hasOwnProperty('videoOn')) {
|
|
if (object.info.videoOn) {
|
|
target.videoState = RenderedTarget.VIDEO_STATE.ON;
|
|
}
|
|
}
|
|
}
|
|
if (object.hasOwnProperty('indexInLibrary')) {
|
|
// Temporarily store the 'indexInLibrary' property from the sb2 file
|
|
// so that we can correctly order sprites in the target pane.
|
|
// This will be deleted after we are done parsing and ordering the targets list.
|
|
target.targetPaneOrder = object.indexInLibrary;
|
|
}
|
|
|
|
target.isStage = topLevel;
|
|
|
|
Promise.all(costumePromises).then(costumes => {
|
|
sprite.costumes = costumes;
|
|
});
|
|
|
|
Promise.all(soundPromises).then(sounds => {
|
|
sprite.sounds = sounds;
|
|
});
|
|
|
|
// The stage will have child objects; recursively process them.
|
|
const childrenPromises = [];
|
|
if (object.children) {
|
|
for (let m = 0; m < object.children.length; m++) {
|
|
childrenPromises.push(parseScratchObject(object.children[m], runtime, extensions, false, zip));
|
|
}
|
|
}
|
|
|
|
return Promise.all(
|
|
costumePromises.concat(soundPromises)
|
|
).then(() =>
|
|
Promise.all(
|
|
childrenPromises
|
|
).then(children => {
|
|
// Need create broadcast msgs as variables after
|
|
// all other targets have finished processing.
|
|
if (target.isStage) {
|
|
const allBroadcastMsgs = globalBroadcastMsgObj.globalBroadcastMsgs;
|
|
const allBroadcastMsgFields = globalBroadcastMsgObj.allBroadcastFields;
|
|
const oldEmptyMsgName = globalBroadcastMsgObj.emptyMsgName;
|
|
if (allBroadcastMsgs[oldEmptyMsgName]) {
|
|
// Find a fresh 'messageN'
|
|
let currIndex = 1;
|
|
while (allBroadcastMsgs[`message${currIndex}`]) {
|
|
currIndex += 1;
|
|
}
|
|
const newEmptyMsgName = `message${currIndex}`;
|
|
// Add the new empty message name to the broadcast message
|
|
// name map, and assign it the old id.
|
|
// Then, delete the old entry in map.
|
|
allBroadcastMsgs[newEmptyMsgName] = allBroadcastMsgs[oldEmptyMsgName];
|
|
delete allBroadcastMsgs[oldEmptyMsgName];
|
|
// Now update all the broadcast message fields with
|
|
// the new empty message name.
|
|
for (let i = 0; i < allBroadcastMsgFields.length; i++) {
|
|
if (allBroadcastMsgFields[i].value === '') {
|
|
allBroadcastMsgFields[i].value = newEmptyMsgName;
|
|
}
|
|
}
|
|
}
|
|
// Traverse the broadcast message name map and create
|
|
// broadcast messages as variables on the stage (which is this
|
|
// target).
|
|
for (const msgName in allBroadcastMsgs) {
|
|
const msgId = allBroadcastMsgs[msgName];
|
|
const newMsg = new Variable(
|
|
msgId,
|
|
msgName,
|
|
Variable.BROADCAST_MESSAGE_TYPE,
|
|
false
|
|
);
|
|
target.variables[newMsg.id] = newMsg;
|
|
}
|
|
}
|
|
let targets = [target];
|
|
const deferredMonitors = [];
|
|
for (let n = 0; n < children.length; n++) {
|
|
if (children[n]) {
|
|
if (children[n].deferredMonitor) {
|
|
deferredMonitors.push(children[n]);
|
|
} else {
|
|
targets = targets.concat(children[n]);
|
|
}
|
|
}
|
|
}
|
|
for (let n = 0; n < deferredMonitors.length; n++) {
|
|
parseMonitorObject(deferredMonitors[n], runtime, targets, extensions);
|
|
}
|
|
return targets;
|
|
})
|
|
);
|
|
};
|
|
|
|
const reorderParsedTargets = function (targets) {
|
|
// Reorder parsed targets based on the temporary targetPaneOrder property
|
|
// and then delete it.
|
|
|
|
targets.sort((a, b) => a.targetPaneOrder - b.targetPaneOrder);
|
|
|
|
// Delete the temporary target pane ordering since we shouldn't need it anymore.
|
|
targets.forEach(t => {
|
|
delete t.targetPaneOrder;
|
|
});
|
|
|
|
return targets;
|
|
};
|
|
|
|
|
|
/**
|
|
* Top-level handler. Parse provided JSON,
|
|
* and process the top-level object (the stage object).
|
|
* @param {!object} json SB2-format JSON to load.
|
|
* @param {!Runtime} runtime Runtime object to load all structures into.
|
|
* @param {boolean=} optForceSprite If set, treat as sprite (Sprite2).
|
|
* @param {?object} zip Optional zipped assets for local file import
|
|
* @return {Promise.<ImportedProject>} Promise that resolves to the loaded targets when ready.
|
|
*/
|
|
const sb2import = function (json, runtime, optForceSprite, zip) {
|
|
const extensions = {
|
|
extensionIDs: new Set(),
|
|
extensionURLs: new Map()
|
|
};
|
|
return parseScratchObject(json, runtime, extensions, !optForceSprite, zip)
|
|
.then(reorderParsedTargets)
|
|
.then(targets => ({
|
|
targets,
|
|
extensions
|
|
}));
|
|
};
|
|
|
|
/**
|
|
* Given the sb2 block, inspect the specmap for a translation method or object.
|
|
* @param {!object} block a sb2 formatted block
|
|
* @return {object} specmap block to parse this opcode
|
|
*/
|
|
const specMapBlock = function (block) {
|
|
const opcode = block[0];
|
|
const mapped = opcode && specMap[opcode];
|
|
if (!mapped) {
|
|
log.warn(`Couldn't find SB2 block: ${opcode}`);
|
|
return null;
|
|
}
|
|
if (typeof mapped === 'function') {
|
|
return mapped(block);
|
|
}
|
|
return mapped;
|
|
};
|
|
|
|
/**
|
|
* Parse a single SB2 JSON-formatted block and its children.
|
|
* @param {!object} sb2block SB2 JSON-formatted block.
|
|
* @param {Function} addBroadcastMsg function to update broadcast message name map
|
|
* @param {Function} getVariableId function to retrieve a variable's ID based on name
|
|
* @param {ImportedExtensionsInfo} extensions - (in/out) parsed extension information will be stored here.
|
|
* @param {ParseState} parseState - info on the state of parsing beyond the current block.
|
|
* @param {object<int, Comment>} comments - Comments from sb2 project that need to be attached to blocks.
|
|
* They are indexed in this object by the sb2 flattened block list index indicating
|
|
* which block they should attach to.
|
|
* @param {int} commentIndex The comment index for the block to be parsed if it were in a flattened
|
|
* list of all blocks for the target
|
|
* @return {Array.<object|int>} Tuple where first item is the Scratch VM-format block (or null if unsupported object),
|
|
* and second item is the updated comment index (after this block and its children are parsed)
|
|
*/
|
|
const parseBlock = function (sb2block, addBroadcastMsg, getVariableId, extensions, parseState, comments, commentIndex) {
|
|
const commentsForParsedBlock = (comments && typeof commentIndex === 'number' && !isNaN(commentIndex)) ?
|
|
comments[commentIndex] : null;
|
|
const blockMetadata = specMapBlock(sb2block);
|
|
if (!blockMetadata) {
|
|
// No block opcode found, exclude this block, increment the commentIndex,
|
|
// make all block comments into workspace comments and send them to zero/zero
|
|
// to prevent serialization issues.
|
|
if (commentsForParsedBlock) {
|
|
commentsForParsedBlock.forEach(comment => {
|
|
comment.blockId = null;
|
|
comment.x = comment.y = 0;
|
|
});
|
|
}
|
|
return [null, commentIndex + 1];
|
|
}
|
|
const oldOpcode = sb2block[0];
|
|
|
|
// If the block is from an extension, record it.
|
|
const index = blockMetadata.opcode.indexOf('_');
|
|
const prefix = blockMetadata.opcode.substring(0, index);
|
|
if (CORE_EXTENSIONS.indexOf(prefix) === -1) {
|
|
if (prefix !== '') extensions.extensionIDs.add(prefix);
|
|
}
|
|
|
|
// Block skeleton.
|
|
const activeBlock = {
|
|
id: uid(), // Generate a new block unique ID.
|
|
opcode: blockMetadata.opcode, // Converted, e.g. "motion_movesteps".
|
|
inputs: {}, // Inputs to this block and the blocks they point to.
|
|
fields: {}, // Fields on this block and their values.
|
|
next: null, // Next block.
|
|
shadow: false, // No shadow blocks in an SB2 by default.
|
|
children: [] // Store any generated children, flattened in `flatten`.
|
|
};
|
|
|
|
// Attach any comments to this block..
|
|
if (commentsForParsedBlock) {
|
|
// Attach only the last comment to the block, make all others workspace comments
|
|
activeBlock.comment = commentsForParsedBlock[commentsForParsedBlock.length - 1].id;
|
|
commentsForParsedBlock.forEach(comment => {
|
|
if (comment.id === activeBlock.comment) {
|
|
comment.blockId = activeBlock.id;
|
|
} else {
|
|
// All other comments don't get a block ID and are sent back to zero.
|
|
// This is important, because if they have `null` x/y, serialization breaks.
|
|
comment.blockId = null;
|
|
comment.x = comment.y = 0;
|
|
}
|
|
});
|
|
}
|
|
commentIndex++;
|
|
|
|
const parentExpectedArg = parseState.expectedArg;
|
|
|
|
// For a procedure call, generate argument map from proc string.
|
|
if (oldOpcode === 'call') {
|
|
blockMetadata.argMap = parseProcedureArgMap(sb2block[1]);
|
|
}
|
|
// Look at the expected arguments in `blockMetadata.argMap.`
|
|
// The basic problem here is to turn positional SB2 arguments into
|
|
// non-positional named Scratch VM arguments.
|
|
for (let i = 0; i < blockMetadata.argMap.length; i++) {
|
|
const expectedArg = blockMetadata.argMap[i];
|
|
const providedArg = sb2block[i + 1]; // (i = 0 is opcode)
|
|
// Whether the input is obscuring a shadow.
|
|
let shadowObscured = false;
|
|
// Positional argument is an input.
|
|
if (expectedArg.type === 'input') {
|
|
// Create a new block and input metadata.
|
|
const inputUid = uid();
|
|
activeBlock.inputs[expectedArg.inputName] = {
|
|
name: expectedArg.inputName,
|
|
block: null,
|
|
shadow: null
|
|
};
|
|
if (typeof providedArg === 'object' && providedArg) {
|
|
// Block or block list occupies the input.
|
|
let innerBlocks;
|
|
parseState.expectedArg = expectedArg;
|
|
if (typeof providedArg[0] === 'object' && providedArg[0]) {
|
|
// Block list occupies the input.
|
|
[innerBlocks, commentIndex] = parseBlockList(providedArg, addBroadcastMsg, getVariableId,
|
|
extensions, parseState, comments, commentIndex);
|
|
} else {
|
|
// Single block occupies the input.
|
|
const parsedBlockDesc = parseBlock(providedArg, addBroadcastMsg, getVariableId, extensions,
|
|
parseState, comments, commentIndex);
|
|
innerBlocks = [parsedBlockDesc[0]];
|
|
// Update commentIndex
|
|
commentIndex = parsedBlockDesc[1];
|
|
}
|
|
parseState.expectedArg = parentExpectedArg;
|
|
// Check if innerBlocks is an empty list.
|
|
// This indicates that all the inner blocks from the sb2 have
|
|
// unknown opcodes and have been skipped.
|
|
if (innerBlocks.length === 0) continue;
|
|
let previousBlock = null;
|
|
for (let j = 0; j < innerBlocks.length; j++) {
|
|
if (j === 0) {
|
|
innerBlocks[j].parent = activeBlock.id;
|
|
} else {
|
|
innerBlocks[j].parent = previousBlock;
|
|
}
|
|
previousBlock = innerBlocks[j].id;
|
|
}
|
|
// Obscures any shadow.
|
|
shadowObscured = true;
|
|
activeBlock.inputs[expectedArg.inputName].block = (
|
|
innerBlocks[0].id
|
|
);
|
|
activeBlock.children = (
|
|
activeBlock.children.concat(innerBlocks)
|
|
);
|
|
}
|
|
// Generate a shadow block to occupy the input.
|
|
if (!expectedArg.inputOp) {
|
|
// Undefined inputOp. inputOp should always be defined for inputs.
|
|
log.warn(`Unknown input operation for input ${expectedArg.inputName} of opcode ${activeBlock.opcode}.`);
|
|
continue;
|
|
}
|
|
if (expectedArg.inputOp === 'boolean' || expectedArg.inputOp === 'substack') {
|
|
// No editable shadow input; e.g., for a boolean.
|
|
continue;
|
|
}
|
|
// Each shadow has a field generated for it automatically.
|
|
// Value to be filled in the field.
|
|
let fieldValue = providedArg;
|
|
// Shadows' field names match the input name, except for these:
|
|
let fieldName = expectedArg.inputName;
|
|
if (expectedArg.inputOp === 'math_number' ||
|
|
expectedArg.inputOp === 'math_whole_number' ||
|
|
expectedArg.inputOp === 'math_positive_number' ||
|
|
expectedArg.inputOp === 'math_integer' ||
|
|
expectedArg.inputOp === 'math_angle') {
|
|
fieldName = 'NUM';
|
|
// Fields are given Scratch 2.0 default values if obscured.
|
|
if (shadowObscured) {
|
|
fieldValue = 10;
|
|
}
|
|
} else if (expectedArg.inputOp === 'text') {
|
|
fieldName = 'TEXT';
|
|
if (shadowObscured) {
|
|
fieldValue = '';
|
|
}
|
|
} else if (expectedArg.inputOp === 'colour_picker') {
|
|
// Convert SB2 color to hex.
|
|
fieldValue = Color.decimalToHex(providedArg);
|
|
fieldName = 'COLOUR';
|
|
if (shadowObscured) {
|
|
fieldValue = '#990000';
|
|
}
|
|
} else if (expectedArg.inputOp === 'event_broadcast_menu') {
|
|
fieldName = 'BROADCAST_OPTION';
|
|
if (shadowObscured) {
|
|
fieldValue = '';
|
|
}
|
|
} else if (expectedArg.inputOp === 'music.menu.DRUM') {
|
|
if (shadowObscured) {
|
|
fieldValue = 1;
|
|
}
|
|
} else if (expectedArg.inputOp === 'music.menu.INSTRUMENT') {
|
|
if (shadowObscured) {
|
|
fieldValue = 1;
|
|
}
|
|
} else if (expectedArg.inputOp === 'videoSensing.menu.ATTRIBUTE') {
|
|
if (shadowObscured) {
|
|
fieldValue = 'motion';
|
|
}
|
|
} else if (expectedArg.inputOp === 'videoSensing.menu.SUBJECT') {
|
|
if (shadowObscured) {
|
|
fieldValue = 'this sprite';
|
|
}
|
|
} else if (expectedArg.inputOp === 'videoSensing.menu.VIDEO_STATE') {
|
|
if (shadowObscured) {
|
|
fieldValue = 'on';
|
|
}
|
|
} else if (shadowObscured) {
|
|
// Filled drop-down menu.
|
|
fieldValue = '';
|
|
}
|
|
const fields = {};
|
|
fields[fieldName] = {
|
|
name: fieldName,
|
|
value: fieldValue
|
|
};
|
|
// event_broadcast_menus have some extra properties to add to the
|
|
// field and a different value than the rest
|
|
if (expectedArg.inputOp === 'event_broadcast_menu') {
|
|
// Need to update the broadcast message name map with
|
|
// the value of this field.
|
|
// Also need to provide the fields[fieldName] object,
|
|
// so that we can later update its value property, e.g.
|
|
// if sb2 message name is empty string, we will later
|
|
// replace this field's value with messageN
|
|
// once we can traverse through all the existing message names
|
|
// and come up with a fresh messageN.
|
|
const broadcastId = addBroadcastMsg(fieldValue, fields[fieldName]);
|
|
fields[fieldName].id = broadcastId;
|
|
fields[fieldName].variableType = expectedArg.variableType;
|
|
}
|
|
activeBlock.children.push({
|
|
id: inputUid,
|
|
opcode: expectedArg.inputOp,
|
|
inputs: {},
|
|
fields: fields,
|
|
next: null,
|
|
topLevel: false,
|
|
parent: activeBlock.id,
|
|
shadow: true
|
|
});
|
|
activeBlock.inputs[expectedArg.inputName].shadow = inputUid;
|
|
// If no block occupying the input, alias to the shadow.
|
|
if (!activeBlock.inputs[expectedArg.inputName].block) {
|
|
activeBlock.inputs[expectedArg.inputName].block = inputUid;
|
|
}
|
|
} else if (expectedArg.type === 'field') {
|
|
// Add as a field on this block.
|
|
activeBlock.fields[expectedArg.fieldName] = {
|
|
name: expectedArg.fieldName,
|
|
value: providedArg
|
|
};
|
|
|
|
if (expectedArg.fieldName === 'VARIABLE') {
|
|
// Add `id` property to variable fields
|
|
activeBlock.fields[expectedArg.fieldName].id = getVariableId(providedArg, Variable.SCALAR_TYPE);
|
|
} else if (expectedArg.fieldName === 'LIST') {
|
|
// Add `id` property to variable fields
|
|
activeBlock.fields[expectedArg.fieldName].id = getVariableId(providedArg, Variable.LIST_TYPE);
|
|
} else if (expectedArg.fieldName === 'BROADCAST_OPTION') {
|
|
// Add the name in this field to the broadcast msg name map.
|
|
// Also need to provide the fields[fieldName] object,
|
|
// so that we can later update its value property, e.g.
|
|
// if sb2 message name is empty string, we will later
|
|
// replace this field's value with messageN
|
|
// once we can traverse through all the existing message names
|
|
// and come up with a fresh messageN.
|
|
const broadcastId = addBroadcastMsg(providedArg, activeBlock.fields[expectedArg.fieldName]);
|
|
activeBlock.fields[expectedArg.fieldName].id = broadcastId;
|
|
}
|
|
const varType = expectedArg.variableType;
|
|
if (typeof varType === 'string') {
|
|
activeBlock.fields[expectedArg.fieldName].variableType = varType;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Updates for blocks that have new menus (e.g. in Looks)
|
|
switch (oldOpcode) {
|
|
case 'comeToFront':
|
|
activeBlock.fields.FRONT_BACK = {
|
|
name: 'FRONT_BACK',
|
|
value: 'front'
|
|
};
|
|
break;
|
|
case 'goBackByLayers:':
|
|
activeBlock.fields.FORWARD_BACKWARD = {
|
|
name: 'FORWARD_BACKWARD',
|
|
value: 'backward'
|
|
};
|
|
break;
|
|
case 'backgroundIndex':
|
|
activeBlock.fields.NUMBER_NAME = {
|
|
name: 'NUMBER_NAME',
|
|
value: 'number'
|
|
};
|
|
break;
|
|
case 'sceneName':
|
|
activeBlock.fields.NUMBER_NAME = {
|
|
name: 'NUMBER_NAME',
|
|
value: 'name'
|
|
};
|
|
break;
|
|
case 'costumeIndex':
|
|
activeBlock.fields.NUMBER_NAME = {
|
|
name: 'NUMBER_NAME',
|
|
value: 'number'
|
|
};
|
|
break;
|
|
case 'costumeName':
|
|
activeBlock.fields.NUMBER_NAME = {
|
|
name: 'NUMBER_NAME',
|
|
value: 'name'
|
|
};
|
|
break;
|
|
}
|
|
|
|
// Special cases to generate mutations.
|
|
if (oldOpcode === 'stopScripts') {
|
|
// Mutation for stop block: if the argument is 'other scripts',
|
|
// the block needs a next connection.
|
|
if (sb2block[1] === 'other scripts in sprite' ||
|
|
sb2block[1] === 'other scripts in stage') {
|
|
activeBlock.mutation = {
|
|
tagName: 'mutation',
|
|
hasnext: 'true',
|
|
children: []
|
|
};
|
|
}
|
|
} else if (oldOpcode === 'procDef') {
|
|
// Mutation for procedure definition:
|
|
// store all 2.0 proc data.
|
|
const procData = sb2block.slice(1);
|
|
// Create a new block and input metadata.
|
|
const inputUid = uid();
|
|
const inputName = 'custom_block';
|
|
activeBlock.inputs[inputName] = {
|
|
name: inputName,
|
|
block: inputUid,
|
|
shadow: inputUid
|
|
};
|
|
activeBlock.children = [{
|
|
id: inputUid,
|
|
opcode: 'procedures_prototype',
|
|
inputs: {},
|
|
fields: {},
|
|
next: null,
|
|
shadow: true,
|
|
children: [],
|
|
mutation: {
|
|
tagName: 'mutation',
|
|
proccode: procData[0], // e.g., "abc %n %b %s"
|
|
argumentnames: JSON.stringify(procData[1]), // e.g. ['arg1', 'arg2']
|
|
argumentids: JSON.stringify(parseProcedureArgIds(procData[0])),
|
|
argumentdefaults: JSON.stringify(procData[2]), // e.g., [1, 'abc']
|
|
warp: procData[3], // Warp mode, e.g., true/false.
|
|
children: []
|
|
}
|
|
}];
|
|
} else if (oldOpcode === 'call') {
|
|
// Mutation for procedure call:
|
|
// string for proc code (e.g., "abc %n %b %s").
|
|
activeBlock.mutation = {
|
|
tagName: 'mutation',
|
|
children: [],
|
|
proccode: sb2block[1],
|
|
argumentids: JSON.stringify(parseProcedureArgIds(sb2block[1]))
|
|
};
|
|
} else if (oldOpcode === 'getParam') {
|
|
let returnCode = sb2block[2];
|
|
|
|
// Ensure the returnCode is "b" if used in a boolean input.
|
|
if (parentExpectedArg && parentExpectedArg.inputOp === 'boolean' && returnCode !== 'b') {
|
|
returnCode = 'b';
|
|
}
|
|
|
|
// Assign correct opcode based on the block shape.
|
|
switch (returnCode) {
|
|
case 'r':
|
|
activeBlock.opcode = 'argument_reporter_string_number';
|
|
break;
|
|
case 'b':
|
|
activeBlock.opcode = 'argument_reporter_boolean';
|
|
break;
|
|
}
|
|
}
|
|
return [activeBlock, commentIndex];
|
|
};
|
|
|
|
module.exports = {
|
|
deserialize: sb2import
|
|
};
|