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Merge pull request #1180 from kchadha/parse-sb2-comments

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Import Comments from 2.0 Projects
This commit is contained in:
Paul Kaplan 2018-05-31 16:51:22 -04:00 committed by GitHub
commit ac91d8af65
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12 changed files with 345 additions and 41 deletions
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27
src/engine/blocks.js
View file

@ -5,6 +5,7 @@ const MonitorRecord = require('./monitor-record');
const Clone = require('../util/clone');
const {Map} = require('immutable');
const BlocksExecuteCache = require('./blocks-execute-cache');
const log = require('../util/log');
/**
* @fileoverview
@ -734,19 +735,21 @@ class Blocks {
/**
* Encode all of `this._blocks` as an XML string usable
* by a Blockly/scratch-blocks workspace.
* @param {object<string, Comment>} comments Map of comments referenced by id
* @return {string} String of XML representing this object's blocks.
*/
toXML () {
return this._scripts.map(script => this.blockToXML(script)).join();
toXML (comments) {
return this._scripts.map(script => this.blockToXML(script, comments)).join();
}
/**
* Recursively encode an individual block and its children
* into a Blockly/scratch-blocks XML string.
* @param {!string} blockId ID of block to encode.
* @param {object<string, Comment>} comments Map of comments referenced by id
* @return {string} String of XML representing this block and any children.
*/
blockToXML (blockId) {
blockToXML (blockId, comments) {
const block = this._blocks[blockId];
// Encode properties of this block.
const tagName = (block.shadow) ? 'shadow' : 'block';
@ -756,6 +759,18 @@ class Blocks {
type="${block.opcode}"
${block.topLevel ? `x="${block.x}" y="${block.y}"` : ''}
>`;
const commentId = block.comment;
if (commentId) {
if (comments) {
if (comments.hasOwnProperty(commentId)) {
xmlString += comments[commentId].toXML();
} else {
log.warn(`Could not find comment with id: ${commentId} in provided comment descriptions.`);
}
} else {
log.warn(`Cannot serialize comment with id: ${commentId}; no comment descriptions provided.`);
}
}
// Add any mutation. Must come before inputs.
if (block.mutation) {
xmlString += this.mutationToXML(block.mutation);
@ -768,11 +783,11 @@ class Blocks {
if (blockInput.block || blockInput.shadow) {
xmlString += `<value name="${blockInput.name}">`;
if (blockInput.block) {
xmlString += this.blockToXML(blockInput.block);
xmlString += this.blockToXML(blockInput.block, comments);
}
if (blockInput.shadow && blockInput.shadow !== blockInput.block) {
// Obscured shadow.
xmlString += this.blockToXML(blockInput.shadow);
xmlString += this.blockToXML(blockInput.shadow, comments);
}
xmlString += '</value>';
}
@ -798,7 +813,7 @@ class Blocks {
}
// Add blocks connected to the next connection.
if (block.next) {
xmlString += `<next>${this.blockToXML(block.next)}</next>`;
xmlString += `<next>${this.blockToXML(block.next, comments)}</next>`;
}
xmlString += `</${tagName}>`;
return xmlString;

56
src/engine/comment.js Normal file
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@ -0,0 +1,56 @@
/**
* @fileoverview
* Object representing a Scratch Comment (block or workspace).
*/
const uid = require('../util/uid');
const Cast = require('../util/cast');
class Comment {
/**
* @param {string} id Id of the comment.
* @param {string} text Text content of the comment.
* @param {number} x X position of the comment on the workspace.
* @param {number} y Y position of the comment on the workspace.
* @param {number} width The width of the comment when it is full size.
* @param {number} height The height of the comment when it is full size.
* @param {boolean} minimized Whether the comment is minimized.
* @constructor
*/
constructor (id, text, x, y, width, height, minimized) {
this.id = id || uid();
this.text = text;
this.x = x;
this.y = y;
this.width = Math.max(Cast.toNumber(width), Comment.MIN_WIDTH);
this.height = Math.max(Cast.toNumber(height), Comment.MIN_HEIGHT);
this.minimized = minimized || false;
this.blockId = null;
}
toXML () {
return `<comment id="${this.id}" x="${this.x}" y="${
this.y}" w="${this.width}" h="${this.height}" pinned="${
this.blockId !== null}" minimized="${this.minimized}">${this.text}</comment>`;
}
// TODO choose min and defaults for width and height
static get MIN_WIDTH () {
return 20;
}
static get MIN_HEIGHT () {
return 20;
}
static get DEFAULT_WIDTH () {
return 100;
}
static get DEFAULT_HEIGHT () {
return 100;
}
}
module.exports = Comment;

8
src/engine/target.js
View file

@ -43,16 +43,16 @@ class Target extends EventEmitter {
this.blocks = blocks;
/**
* Dictionary of variables and their values for this target.
* Key is the variable name.
* Key is the variable id.
* @type {Object.<string,*>}
*/
this.variables = {};
/**
* Dictionary of lists and their contents for this target.
* Key is the list name.
* Dictionary of comments for this target.
* Key is the comment id.
* @type {Object.<string,*>}
*/
this.lists = {};
this.comments = {};
/**
* Dictionary of custom state for this target.
* This can be used to store target-specific custom state for blocks which need it.

142
src/serialization/sb2.js
View file

@ -13,6 +13,7 @@ const log = require('../util/log');
const uid = require('../util/uid');
const StringUtil = require('../util/string-util');
const specMap = require('./sb2_specmap');
const Comment = require('../engine/comment');
const Variable = require('../engine/variable');
const MonitorRecord = require('../engine/monitor-record');
const StageLayering = require('../engine/stage-layering');
@ -36,6 +37,12 @@ const CORE_EXTENSIONS = [
'sound'
];
// Adjust script coordinates to account for
// larger block size in scratch-blocks.
// @todo: Determine more precisely the right formulas here.
const WORKSPACE_X_SCALE = 1.5;
const WORKSPACE_Y_SCALE = 2.2;
/**
* Convert a Scratch 2.0 procedure string (e.g., "my_procedure %s %b %n")
* into an argument map. This allows us to provide the expected inputs
@ -110,15 +117,26 @@ const flatten = function (blocks) {
* @param {Function} addBroadcastMsg function to update broadcast message name map
* @param {Function} getVariableId function to retreive a variable's ID based on name
* @param {ImportedExtensionsInfo} extensions - (in/out) parsed extension information will be stored here.
* @return {Array.<object>} Scratch VM-format block list.
* @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 current index of the top block in this list 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 list, and
* second item is the updated comment index
*/
const parseBlockList = function (blockList, addBroadcastMsg, getVariableId, extensions) {
const parseBlockList = function (blockList, addBroadcastMsg, getVariableId, extensions, comments, commentIndex) {
const resultingList = [];
let previousBlock = null; // For setting next.
for (let i = 0; i < blockList.length; i++) {
const block = blockList[i];
// eslint-disable-next-line no-use-before-define
const parsedBlock = parseBlock(block, addBroadcastMsg, getVariableId, extensions);
const parsedBlockAndComments = parseBlock(block, addBroadcastMsg, getVariableId,
extensions, comments, commentIndex);
const parsedBlock = parsedBlockAndComments[0];
// Update commentIndex
commentIndex = parsedBlockAndComments[1];
if (typeof parsedBlock === 'undefined') continue;
if (previousBlock) {
parsedBlock.parent = previousBlock.id;
@ -127,7 +145,7 @@ const parseBlockList = function (blockList, addBroadcastMsg, getVariableId, exte
previousBlock = parsedBlock;
resultingList.push(parsedBlock);
}
return resultingList;
return [resultingList, commentIndex];
};
/**
@ -138,20 +156,24 @@ const parseBlockList = function (blockList, addBroadcastMsg, getVariableId, exte
* @param {Function} addBroadcastMsg function to update broadcast message name map
* @param {Function} getVariableId function to retreive a variable's ID based on name
* @param {ImportedExtensionsInfo} extensions - (in/out) parsed extension information will be stored here.
* @param {object} comments Comments that need to be attached to the blocks that need to be parsed
*/
const parseScripts = function (scripts, blocks, addBroadcastMsg, getVariableId, extensions) {
const parseScripts = function (scripts, blocks, addBroadcastMsg, getVariableId, extensions, comments) {
// Keep track of the index of the current script being
// parsed in order to attach block comments correctly
let scriptIndexForComment = 0;
for (let i = 0; i < scripts.length; i++) {
const script = scripts[i];
const scriptX = script[0];
const scriptY = script[1];
const blockList = script[2];
const parsedBlockList = parseBlockList(blockList, addBroadcastMsg, getVariableId, extensions);
const [parsedBlockList, newCommentIndex] = parseBlockList(blockList, addBroadcastMsg, getVariableId, extensions,
comments, scriptIndexForComment);
scriptIndexForComment = newCommentIndex;
if (parsedBlockList[0]) {
// Adjust script coordinates to account for
// larger block size in scratch-blocks.
// @todo: Determine more precisely the right formulas here.
parsedBlockList[0].x = scriptX * 1.5;
parsedBlockList[0].y = scriptY * 2.2;
parsedBlockList[0].x = scriptX * WORKSPACE_X_SCALE;
parsedBlockList[0].y = scriptY * WORKSPACE_Y_SCALE;
parsedBlockList[0].topLevel = true;
parsedBlockList[0].parent = null;
}
@ -242,11 +264,13 @@ const parseMonitorObject = (object, runtime, targets, extensions) => {
// Create var id getter to make block naming/parsing easier, variables already created.
const getVariableId = generateVariableIdGetter(target.id, false);
// eslint-disable-next-line no-use-before-define
const block = parseBlock(
const [block, _] = parseBlock(
[object.cmd, object.param], // Scratch 2 monitor blocks only have one param.
null, // `addBroadcastMsg`, not needed for monitor blocks.
getVariableId,
extensions
extensions,
null, // `comments`, not needed for monitor blocks
null // `commentIndex`, not needed for monitor blocks
);
// Monitor blocks have special IDs to match the toolbox obtained from the getId
@ -423,9 +447,63 @@ const parseScratchObject = function (object, runtime, extensions, topLevel, zip)
}
}
// 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);
parseScripts(object.scripts, blocks, addBroadcastMsg, getVariableId, extensions, blockComments);
}
// Update stage specific blocks (e.g. sprite clicked <=> stage clicked)
@ -619,9 +697,15 @@ const specMapBlock = function (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.
* @return {object} Scratch VM format block, or null if unsupported object.
* @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 {[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) {
const parseBlock = function (sb2block, addBroadcastMsg, getVariableId, extensions, comments, commentIndex) {
const blockMetadata = specMapBlock(sb2block);
if (!blockMetadata) {
return;
@ -645,6 +729,21 @@ const parseBlock = function (sb2block, addBroadcastMsg, getVariableId, extension
shadow: false, // No shadow blocks in an SB2 by default.
children: [] // Store any generated children, flattened in `flatten`.
};
// Attach any comments to this block..
const commentsForParsedBlock = (comments && typeof commentIndex === 'number' && !isNaN(commentIndex)) ?
comments[commentIndex] : null;
if (commentsForParsedBlock) {
// TODO currently only attaching the last comment to the block if there are multiple...
// not sure what to do here.. concatenate all the messages in all the comments and only
// keep one around?
activeBlock.comment = commentsForParsedBlock[commentsForParsedBlock.length - 1].id;
commentsForParsedBlock.forEach(comment => {
comment.blockId = activeBlock.id;
});
}
commentIndex++;
// For a procedure call, generate argument map from proc string.
if (oldOpcode === 'call') {
blockMetadata.argMap = parseProcedureArgMap(sb2block[1]);
@ -671,10 +770,15 @@ const parseBlock = function (sb2block, addBroadcastMsg, getVariableId, extension
let innerBlocks;
if (typeof providedArg[0] === 'object' && providedArg[0]) {
// Block list occupies the input.
innerBlocks = parseBlockList(providedArg, addBroadcastMsg, getVariableId, extensions);
[innerBlocks, commentIndex] = parseBlockList(providedArg, addBroadcastMsg, getVariableId,
extensions, comments, commentIndex);
} else {
// Single block occupies the input.
innerBlocks = [parseBlock(providedArg, addBroadcastMsg, getVariableId, extensions)];
const parsedBlockDesc = parseBlock(providedArg, addBroadcastMsg, getVariableId, extensions,
comments, commentIndex);
innerBlocks = [parsedBlockDesc[0]];
// Update commentIndex
commentIndex = parsedBlockDesc[1];
}
let previousBlock = null;
for (let j = 0; j < innerBlocks.length; j++) {
@ -914,7 +1018,7 @@ const parseBlock = function (sb2block, addBroadcastMsg, getVariableId, extension
break;
}
}
return activeBlock;
return [activeBlock, commentIndex];
};
module.exports = {

3
src/sprites/rendered-target.js
View file

@ -930,7 +930,6 @@ class RenderedTarget extends Target {
newClone.rotationStyle = this.rotationStyle;
newClone.effects = JSON.parse(JSON.stringify(this.effects));
newClone.variables = JSON.parse(JSON.stringify(this.variables));
newClone.lists = JSON.parse(JSON.stringify(this.lists));
newClone.initDrawable(StageLayering.SPRITE_LAYER);
newClone.updateAllDrawableProperties();
// Place behind the current target.
@ -957,7 +956,6 @@ class RenderedTarget extends Target {
newTarget.rotationStyle = this.rotationStyle;
newTarget.effects = JSON.parse(JSON.stringify(this.effects));
newTarget.variables = JSON.parse(JSON.stringify(this.variables));
newTarget.lists = JSON.parse(JSON.stringify(this.lists));
newTarget.updateAllDrawableProperties();
newTarget.goBehindOther(this);
return newTarget;
@ -1049,7 +1047,6 @@ class RenderedTarget extends Target {
rotationStyle: this.rotationStyle,
blocks: this.blocks._blocks,
variables: this.variables,
lists: this.lists,
costumes: costumes,
sounds: this.getSounds(),
tempo: this.tempo,

6
src/virtual-machine.js
View file

@ -1005,12 +1005,16 @@ class VirtualMachine extends EventEmitter {
);
const variables = Object.keys(variableMap).map(k => variableMap[k]);
const workspaceComments = Object.keys(this.editingTarget.comments)
.map(k => this.editingTarget.comments[k])
.filter(c => c.blockId === null);
const xmlString = `<xml xmlns="http://www.w3.org/1999/xhtml">
<variables>
${variables.map(v => v.toXML()).join()}
</variables>
${this.editingTarget.blocks.toXML()}
${workspaceComments.map(c => c.toXML()).join()}
${this.editingTarget.blocks.toXML(this.editingTarget.comments)}
</xml>`;
this.emit('workspaceUpdate', {xml: xmlString});

BIN
test/fixtures/comments.sb2 vendored Normal file
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Binary file not shown.

91
test/integration/comments.js Normal file
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@ -0,0 +1,91 @@
const path = require('path');
const test = require('tap').test;
const makeTestStorage = require('../fixtures/make-test-storage');
const readFileToBuffer = require('../fixtures/readProjectFile').readFileToBuffer;
const VirtualMachine = require('../../src/index');
const projectUri = path.resolve(__dirname, '../fixtures/comments.sb2');
const project = readFileToBuffer(projectUri);
test('importing sb2 project with comments', t => {
const vm = new VirtualMachine();
vm.attachStorage(makeTestStorage());
// Evaluate playground data and exit
vm.on('playgroundData', e => {
const threads = JSON.parse(e.threads);
t.equal(threads.length, 0);
const stage = vm.runtime.targets[0];
const target = vm.runtime.targets[1];
const stageComments = Object.values(stage.comments);
// Stage has 1 comment, and it is minimized.
t.equal(stageComments.length, 1);
t.equal(stageComments[0].minimized, true);
t.equal(stageComments[0].text, 'A minimized stage comment.');
// The stage comment is a workspace comment
t.equal(stageComments[0].blockId, null);
// Sprite 1 has 6 Comments, 1 workspace comment, and 5 block comments
const targetComments = Object.values(target.comments);
t.equal(targetComments.length, 6);
const spriteWorkspaceComments = targetComments.filter(comment => comment.blockId === null);
t.equal(spriteWorkspaceComments.length, 1);
t.equal(spriteWorkspaceComments[0].minimized, false);
t.equal(spriteWorkspaceComments[0].text, 'This is a workspace comment.');
// Test the sprite block comments
const blockComments = targetComments.filter(comment => !!comment.blockId);
t.equal(blockComments.length, 5);
t.equal(blockComments[0].minimized, true);
t.equal(blockComments[0].text, '1. Green Flag Comment.');
const greenFlagBlock = target.blocks.getBlock(blockComments[0].blockId);
t.equal(greenFlagBlock.comment, blockComments[0].id);
t.equal(greenFlagBlock.opcode, 'event_whenflagclicked');
t.equal(blockComments[1].minimized, true);
t.equal(blockComments[1].text, '2. Turn 15 Degrees Comment.');
const turnRightBlock = target.blocks.getBlock(blockComments[1].blockId);
t.equal(turnRightBlock.comment, blockComments[1].id);
t.equal(turnRightBlock.opcode, 'motion_turnright');
t.equal(blockComments[2].minimized, false);
t.equal(blockComments[2].text, '3. Comment for a loop.');
const repeatBlock = target.blocks.getBlock(blockComments[2].blockId);
t.equal(repeatBlock.comment, blockComments[2].id);
t.equal(repeatBlock.opcode, 'control_repeat');
t.equal(blockComments[3].minimized, false);
t.equal(blockComments[3].text, '4. Comment for a block nested in a loop.');
const changeColorBlock = target.blocks.getBlock(blockComments[3].blockId);
t.equal(changeColorBlock.comment, blockComments[3].id);
t.equal(changeColorBlock.opcode, 'looks_changeeffectby');
t.equal(blockComments[4].minimized, false);
t.equal(blockComments[4].text, '5. Comment for a block outside of a loop.');
const stopAllBlock = target.blocks.getBlock(blockComments[4].blockId);
t.equal(stopAllBlock.comment, blockComments[4].id);
t.equal(stopAllBlock.opcode, 'control_stop');
t.end();
process.nextTick(process.exit);
});
// Start VM, load project, and run
t.doesNotThrow(() => {
vm.start();
vm.clear();
vm.setCompatibilityMode(false);
vm.setTurboMode(false);
vm.loadProject(project).then(() => {
vm.greenFlag();
setTimeout(() => {
vm.getPlaygroundData();
vm.stopAll();
}, 100);
});
});
});

4
test/integration/import_sb2.js
View file

@ -30,7 +30,7 @@ test('default', t => {
t.type(targets[0].id, 'string');
t.type(targets[0].blocks, 'object');
t.type(targets[0].variables, 'object');
t.type(targets[0].lists, 'object');
t.type(targets[0].comments, 'object');
t.equal(targets[0].isOriginal, true);
t.equal(targets[0].currentCostume, 0);
@ -41,7 +41,7 @@ test('default', t => {
t.type(targets[1].id, 'string');
t.type(targets[1].blocks, 'object');
t.type(targets[1].variables, 'object');
t.type(targets[1].lists, 'object');
t.type(targets[1].comments, 'object');
t.equal(targets[1].isOriginal, true);
t.equal(targets[1].currentCostume, 0);

2
test/unit/engine_target.js
View file

@ -12,7 +12,7 @@ test('spec', t => {
t.type(target.id, 'string');
t.type(target.blocks, 'object');
t.type(target.variables, 'object');
t.type(target.lists, 'object');
t.type(target.comments, 'object');
t.type(target._customState, 'object');
t.type(target.createVariable, 'function');

4
test/unit/serialization_sb2.js
View file

@ -29,7 +29,7 @@ test('default', t => {
t.type(targets[0].id, 'string');
t.type(targets[0].blocks, 'object');
t.type(targets[0].variables, 'object');
t.type(targets[0].lists, 'object');
t.type(targets[0].comments, 'object');
t.equal(targets[0].isOriginal, true);
t.equal(targets[0].currentCostume, 0);
@ -40,7 +40,7 @@ test('default', t => {
t.type(targets[1].id, 'string');
t.type(targets[1].blocks, 'object');
t.type(targets[1].variables, 'object');
t.type(targets[1].lists, 'object');
t.type(targets[1].comments, 'object');
t.equal(targets[1].isOriginal, true);
t.equal(targets[1].currentCostume, 0);

43
test/unit/virtual-machine.js
View file

@ -307,6 +307,17 @@ test('duplicateSprite assigns duplicated sprite a fresh name', t => {
test('emitWorkspaceUpdate', t => {
const vm = new VirtualMachine();
const blocksToXML = comments => {
let blockString = 'blocks\n';
if (comments) {
for (const commentId in comments) {
const comment = comments[commentId];
blockString += `A Block Comment: ${comment.toXML()}`;
}
}
return blockString;
};
vm.runtime.targets = [
{
isStage: true,
@ -316,7 +327,13 @@ test('emitWorkspaceUpdate', t => {
}
},
blocks: {
toXML: () => 'blocks'
toXML: blocksToXML
},
comments: {
aStageComment: {
toXML: () => 'aStageComment',
blockId: null
}
}
}, {
variables: {
@ -325,7 +342,13 @@ test('emitWorkspaceUpdate', t => {
}
},
blocks: {
toXML: () => 'blocks'
toXML: blocksToXML
},
comments: {
someBlockComment: {
toXML: () => 'someBlockComment',
blockId: 'someBlockId'
}
}
}, {
variables: {
@ -334,7 +357,17 @@ test('emitWorkspaceUpdate', t => {
}
},
blocks: {
toXML: () => 'blocks'
toXML: blocksToXML
},
comments: {
someOtherComment: {
toXML: () => 'someOtherComment',
blockId: null
},
aBlockComment: {
toXML: () => 'aBlockComment',
blockId: 'a block'
}
}
}
];
@ -347,6 +380,10 @@ test('emitWorkspaceUpdate', t => {
t.notEqual(xml.indexOf('local'), -1);
t.equal(xml.indexOf('unused'), -1);
t.notEqual(xml.indexOf('blocks'), -1);
t.equal(xml.indexOf('aStageComment'), -1);
t.equal(xml.indexOf('someBlockComment'), -1);
t.notEqual(xml.indexOf('someOtherComment'), -1);
t.notEqual(xml.indexOf('A Block Comment: aBlockComment'), -1);
t.end();
});