@wordpress/core-data/build-module/utils/crdt-blocks.mjs.map

Access to and manipulation of core WordPress entities.

{
  "version": 3,
  "sources": ["../../src/utils/crdt-blocks.ts"],
  "sourcesContent": ["/**\n * External dependencies\n */\nimport { v4 as uuidv4 } from 'uuid';\nimport fastDeepEqual from 'fast-deep-equal/es6/index.js';\n\n/**\n * WordPress dependencies\n */\n// @ts-expect-error No exported types.\nimport { getBlockTypes } from '@wordpress/blocks';\nimport { RichTextData } from '@wordpress/rich-text';\nimport { Y } from '@wordpress/sync';\n\n/**\n * Internal dependencies\n */\nimport { createYMap, type YMapRecord, type YMapWrap } from './crdt-utils';\nimport { Delta } from '../sync';\n\ninterface BlockAttributes {\n\t[ key: string ]: unknown;\n}\n\ninterface BlockType {\n\tname: string;\n\tattributes?: Record< string, { type?: string } >;\n}\n\n// A block as represented in Gutenberg's data store.\nexport interface Block {\n\tattributes: BlockAttributes;\n\tclientId?: string;\n\tinnerBlocks: Block[];\n\tisValid?: boolean;\n\tname: string;\n\toriginalContent?: string;\n\tvalidationIssues?: string[]; // unserializable\n}\n\n// A block as represented in the CRDT document (Y.Map).\ninterface YBlockRecord extends YMapRecord {\n\tattributes: YBlockAttributes;\n\tclientId: string;\n\tinnerBlocks: YBlocks;\n\tisValid?: boolean;\n\toriginalContent?: string;\n\tname: string;\n}\n\nexport type YBlock = YMapWrap< YBlockRecord >;\nexport type YBlocks = Y.Array< YBlock >;\n\n// Block attribute schema cannot be known at compile time, so we use Y.Map.\n// Attribute values will be typed as the union of `Y.Text` and `unknown`.\nexport type YBlockAttributes = Y.Map< Y.Text | unknown >;\n\nconst serializableBlocksCache = new WeakMap< WeakKey, Block[] >();\n\nfunction makeBlockAttributesSerializable(\n\tattributes: BlockAttributes\n): BlockAttributes {\n\tconst newAttributes = { ...attributes };\n\tfor ( const [ key, value ] of Object.entries( attributes ) ) {\n\t\tif ( value instanceof RichTextData ) {\n\t\t\tnewAttributes[ key ] = value.valueOf();\n\t\t}\n\t}\n\treturn newAttributes;\n}\n\nfunction makeBlocksSerializable( blocks: Block[] ): Block[] {\n\treturn blocks.map( ( block: Block ) => {\n\t\tconst { name, innerBlocks, attributes, ...rest } = block;\n\t\tdelete rest.validationIssues;\n\t\treturn {\n\t\t\t...rest,\n\t\t\tname,\n\t\t\tattributes: makeBlockAttributesSerializable( attributes ),\n\t\t\tinnerBlocks: makeBlocksSerializable( innerBlocks ),\n\t\t};\n\t} );\n}\n\n/**\n * @param {any}   gblock\n * @param {Y.Map} yblock\n */\nfunction areBlocksEqual( gblock: Block, yblock: YBlock ): boolean {\n\tconst yblockAsJson = yblock.toJSON();\n\n\t// we must not sync clientId, as this can't be generated consistently and\n\t// hence will lead to merge conflicts.\n\tconst overwrites = {\n\t\tinnerBlocks: null,\n\t\tclientId: null,\n\t};\n\tconst res = fastDeepEqual(\n\t\tObject.assign( {}, gblock, overwrites ),\n\t\tObject.assign( {}, yblockAsJson, overwrites )\n\t);\n\tconst inners = gblock.innerBlocks || [];\n\tconst yinners = yblock.get( 'innerBlocks' );\n\treturn (\n\t\tres &&\n\t\tinners.length === yinners?.length &&\n\t\tinners.every( ( block: Block, i: number ) =>\n\t\t\tareBlocksEqual( block, yinners.get( i ) )\n\t\t)\n\t);\n}\n\nfunction createNewYAttributeMap(\n\tblockName: string,\n\tattributes: BlockAttributes\n): YBlockAttributes {\n\treturn new Y.Map(\n\t\tObject.entries( attributes ).map(\n\t\t\t( [ attributeName, attributeValue ] ) => {\n\t\t\t\treturn [\n\t\t\t\t\tattributeName,\n\t\t\t\t\tcreateNewYAttributeValue(\n\t\t\t\t\t\tblockName,\n\t\t\t\t\t\tattributeName,\n\t\t\t\t\t\tattributeValue\n\t\t\t\t\t),\n\t\t\t\t];\n\t\t\t}\n\t\t)\n\t);\n}\n\nfunction createNewYAttributeValue(\n\tblockName: string,\n\tattributeName: string,\n\tattributeValue: unknown\n): Y.Text | unknown {\n\tconst isRichText = isRichTextAttribute( blockName, attributeName );\n\n\tif ( isRichText ) {\n\t\treturn new Y.Text( attributeValue?.toString() ?? '' );\n\t}\n\n\treturn attributeValue;\n}\n\nfunction createNewYBlock( block: Block ): YBlock {\n\treturn createYMap< YBlockRecord >(\n\t\tObject.fromEntries(\n\t\t\tObject.entries( block ).map( ( [ key, value ] ) => {\n\t\t\t\tswitch ( key ) {\n\t\t\t\t\tcase 'attributes': {\n\t\t\t\t\t\treturn [\n\t\t\t\t\t\t\tkey,\n\t\t\t\t\t\t\tcreateNewYAttributeMap( block.name, value ),\n\t\t\t\t\t\t];\n\t\t\t\t\t}\n\n\t\t\t\t\tcase 'innerBlocks': {\n\t\t\t\t\t\tconst innerBlocks = new Y.Array();\n\n\t\t\t\t\t\t// If not an array, set to empty Y.Array.\n\t\t\t\t\t\tif ( ! Array.isArray( value ) ) {\n\t\t\t\t\t\t\treturn [ key, innerBlocks ];\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tinnerBlocks.insert(\n\t\t\t\t\t\t\t0,\n\t\t\t\t\t\t\tvalue.map( ( innerBlock: Block ) =>\n\t\t\t\t\t\t\t\tcreateNewYBlock( innerBlock )\n\t\t\t\t\t\t\t)\n\t\t\t\t\t\t);\n\n\t\t\t\t\t\treturn [ key, innerBlocks ];\n\t\t\t\t\t}\n\n\t\t\t\t\tdefault:\n\t\t\t\t\t\treturn [ key, value ];\n\t\t\t\t}\n\t\t\t} )\n\t\t)\n\t);\n}\n\n/**\n * Merge incoming block data into the local Y.Doc.\n * This function is called to sync local block changes to a shared Y.Doc.\n *\n * @param yblocks        The blocks in the local Y.Doc.\n * @param incomingBlocks Gutenberg blocks being synced.\n * @param cursorPosition The position of the cursor after the change occurs.\n */\nexport function mergeCrdtBlocks(\n\tyblocks: YBlocks,\n\tincomingBlocks: Block[],\n\tcursorPosition: number | null\n): void {\n\t// Ensure we are working with serializable block data.\n\tif ( ! serializableBlocksCache.has( incomingBlocks ) ) {\n\t\tserializableBlocksCache.set(\n\t\t\tincomingBlocks,\n\t\t\tmakeBlocksSerializable( incomingBlocks )\n\t\t);\n\t}\n\tconst allBlocks = serializableBlocksCache.get( incomingBlocks ) ?? [];\n\n\t// Ensure we skip blocks that we don't want to sync at the moment\n\tconst blocksToSync = allBlocks.filter( ( block ) =>\n\t\tshouldBlockBeSynced( block )\n\t);\n\n\t// This is a rudimentary diff implementation similar to the y-prosemirror diffing\n\t// approach.\n\t// A better implementation would also diff the textual content and represent it\n\t// using a Y.Text type.\n\t// However, at this time it makes more sense to keep this algorithm generic to\n\t// support all kinds of block types.\n\t// Ideally, we ensure that block data structure have a consistent data format.\n\t// E.g.:\n\t//   - textual content (using rich-text formatting?) may always be stored under `block.text`\n\t//   - local information that shouldn't be shared (e.g. clientId or isDragging) is stored under `block.private`\n\t//\n\t// @credit Kevin Jahns (dmonad)\n\t// @link https://github.com/WordPress/gutenberg/pull/68483\n\tconst numOfCommonEntries = Math.min(\n\t\tblocksToSync.length ?? 0,\n\t\tyblocks.length\n\t);\n\n\tlet left = 0;\n\tlet right = 0;\n\n\t// skip equal blocks from left\n\tfor (\n\t\t;\n\t\tleft < numOfCommonEntries &&\n\t\tareBlocksEqual( blocksToSync[ left ], yblocks.get( left ) );\n\t\tleft++\n\t) {\n\t\t/* nop */\n\t}\n\n\t// skip equal blocks from right\n\tfor (\n\t\t;\n\t\tright < numOfCommonEntries - left &&\n\t\tareBlocksEqual(\n\t\t\tblocksToSync[ blocksToSync.length - right - 1 ],\n\t\t\tyblocks.get( yblocks.length - right - 1 )\n\t\t);\n\t\tright++\n\t) {\n\t\t/* nop */\n\t}\n\n\tconst numOfUpdatesNeeded = numOfCommonEntries - left - right;\n\tconst numOfInsertionsNeeded = Math.max(\n\t\t0,\n\t\tblocksToSync.length - yblocks.length\n\t);\n\tconst numOfDeletionsNeeded = Math.max(\n\t\t0,\n\t\tyblocks.length - blocksToSync.length\n\t);\n\n\t// updates\n\tfor ( let i = 0; i < numOfUpdatesNeeded; i++, left++ ) {\n\t\tconst block = blocksToSync[ left ];\n\t\tconst yblock = yblocks.get( left );\n\t\tObject.entries( block ).forEach( ( [ key, value ] ) => {\n\t\t\tswitch ( key ) {\n\t\t\t\tcase 'attributes': {\n\t\t\t\t\tconst currentAttributes = yblock.get( key );\n\n\t\t\t\t\t// If attributes are not set on the yblock, use the new values.\n\t\t\t\t\tif ( ! currentAttributes ) {\n\t\t\t\t\t\tyblock.set(\n\t\t\t\t\t\t\tkey,\n\t\t\t\t\t\t\tcreateNewYAttributeMap( block.name, value )\n\t\t\t\t\t\t);\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\n\t\t\t\t\tObject.entries( value ).forEach(\n\t\t\t\t\t\t( [ attributeName, attributeValue ] ) => {\n\t\t\t\t\t\t\tif (\n\t\t\t\t\t\t\t\tfastDeepEqual(\n\t\t\t\t\t\t\t\t\tcurrentAttributes?.get( attributeName ),\n\t\t\t\t\t\t\t\t\tattributeValue\n\t\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t) {\n\t\t\t\t\t\t\t\treturn;\n\t\t\t\t\t\t\t}\n\n\t\t\t\t\t\t\tconst currentAttribute =\n\t\t\t\t\t\t\t\tcurrentAttributes.get( attributeName );\n\t\t\t\t\t\t\tconst isRichText = isRichTextAttribute(\n\t\t\t\t\t\t\t\tblock.name,\n\t\t\t\t\t\t\t\tattributeName\n\t\t\t\t\t\t\t);\n\n\t\t\t\t\t\t\tif (\n\t\t\t\t\t\t\t\tisRichText &&\n\t\t\t\t\t\t\t\t'string' === typeof attributeValue &&\n\t\t\t\t\t\t\t\tcurrentAttributes.has( attributeName ) &&\n\t\t\t\t\t\t\t\tcurrentAttribute instanceof Y.Text\n\t\t\t\t\t\t\t) {\n\t\t\t\t\t\t\t\t// Rich text values are stored as persistent Y.Text instances.\n\t\t\t\t\t\t\t\t// Update the value with a delta in place.\n\t\t\t\t\t\t\t\tmergeRichTextUpdate(\n\t\t\t\t\t\t\t\t\tcurrentAttribute,\n\t\t\t\t\t\t\t\t\tattributeValue,\n\t\t\t\t\t\t\t\t\tcursorPosition\n\t\t\t\t\t\t\t\t);\n\t\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\t\tcurrentAttributes.set(\n\t\t\t\t\t\t\t\t\tattributeName,\n\t\t\t\t\t\t\t\t\tcreateNewYAttributeValue(\n\t\t\t\t\t\t\t\t\t\tblock.name,\n\t\t\t\t\t\t\t\t\t\tattributeName,\n\t\t\t\t\t\t\t\t\t\tattributeValue\n\t\t\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t\t);\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t);\n\n\t\t\t\t\t// Delete any attributes that are no longer present.\n\t\t\t\t\tcurrentAttributes.forEach(\n\t\t\t\t\t\t( _attrValue: unknown, attrName: string ) => {\n\t\t\t\t\t\t\tif ( ! value.hasOwnProperty( attrName ) ) {\n\t\t\t\t\t\t\t\tcurrentAttributes.delete( attrName );\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t);\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\tcase 'innerBlocks': {\n\t\t\t\t\t// Recursively merge innerBlocks\n\t\t\t\t\tlet yInnerBlocks = yblock.get( key );\n\n\t\t\t\t\tif ( ! ( yInnerBlocks instanceof Y.Array ) ) {\n\t\t\t\t\t\tyInnerBlocks = new Y.Array< YBlock >();\n\t\t\t\t\t\tyblock.set( key, yInnerBlocks );\n\t\t\t\t\t}\n\n\t\t\t\t\tmergeCrdtBlocks(\n\t\t\t\t\t\tyInnerBlocks,\n\t\t\t\t\t\tvalue ?? [],\n\t\t\t\t\t\tcursorPosition\n\t\t\t\t\t);\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\tdefault:\n\t\t\t\t\tif ( ! fastDeepEqual( block[ key ], yblock.get( key ) ) ) {\n\t\t\t\t\t\tyblock.set( key, value );\n\t\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t\tyblock.forEach( ( _v, k ) => {\n\t\t\tif ( ! block.hasOwnProperty( k ) ) {\n\t\t\t\tyblock.delete( k );\n\t\t\t}\n\t\t} );\n\t}\n\n\t// deletes\n\tyblocks.delete( left, numOfDeletionsNeeded );\n\n\t// inserts\n\tfor ( let i = 0; i < numOfInsertionsNeeded; i++, left++ ) {\n\t\tconst newBlock = [ createNewYBlock( blocksToSync[ left ] ) ];\n\n\t\tyblocks.insert( left, newBlock );\n\t}\n\n\t// remove duplicate clientids\n\tconst knownClientIds = new Set< string >();\n\tfor ( let j = 0; j < yblocks.length; j++ ) {\n\t\tconst yblock: YBlock = yblocks.get( j );\n\n\t\tlet clientId = yblock.get( 'clientId' );\n\n\t\tif ( ! clientId ) {\n\t\t\tcontinue;\n\t\t}\n\n\t\tif ( knownClientIds.has( clientId ) ) {\n\t\t\tclientId = uuidv4();\n\t\t\tyblock.set( 'clientId', clientId );\n\t\t}\n\t\tknownClientIds.add( clientId );\n\t}\n}\n\n/**\n * Determine if a block should be synced.\n *\n * Ex: A gallery block should not be synced until the images have been\n * uploaded to WordPress, and their url is available. Before that,\n * it's not possible to access the blobs on a client as those are\n * local.\n *\n * @param block The block to check.\n * @return True if the block should be synced, false otherwise.\n */\nfunction shouldBlockBeSynced( block: Block ): boolean {\n\t// Verify that the gallery block is ready to be synced.\n\t// This means that, all images have had their blobs converted to full URLs.\n\t// Checking for only the blobs ensures that blocks that have just been inserted work as well.\n\tif ( 'core/gallery' === block.name ) {\n\t\treturn ! block.innerBlocks.some(\n\t\t\t( innerBlock ) =>\n\t\t\t\tinnerBlock.attributes && innerBlock.attributes.blob\n\t\t);\n\t}\n\n\t// Allow all other blocks to be synced.\n\treturn true;\n}\n\n// Cache rich-text attributes for all block types.\nlet cachedRichTextAttributes: Map< string, Map< string, true > >;\n\n/**\n * Given a block name and attribute key, return true if the attribute is rich-text typed.\n *\n * @param blockName     The name of the block, e.g. 'core/paragraph'.\n * @param attributeName The name of the attribute to check, e.g. 'content'.\n * @return True if the attribute is rich-text typed, false otherwise.\n */\nfunction isRichTextAttribute(\n\tblockName: string,\n\tattributeName: string\n): boolean {\n\tif ( ! cachedRichTextAttributes ) {\n\t\t// Parse the attributes for all blocks once.\n\t\tcachedRichTextAttributes = new Map< string, Map< string, true > >();\n\n\t\tfor ( const blockType of getBlockTypes() as BlockType[] ) {\n\t\t\tconst richTextAttributeMap = new Map< string, true >();\n\n\t\t\tfor ( const [ name, definition ] of Object.entries(\n\t\t\t\tblockType.attributes ?? {}\n\t\t\t) ) {\n\t\t\t\tif ( 'rich-text' === definition.type ) {\n\t\t\t\t\trichTextAttributeMap.set( name, true );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tcachedRichTextAttributes.set(\n\t\t\t\tblockType.name,\n\t\t\t\trichTextAttributeMap\n\t\t\t);\n\t\t}\n\t}\n\n\treturn (\n\t\tcachedRichTextAttributes.get( blockName )?.has( attributeName ) ?? false\n\t);\n}\n\nlet localDoc: Y.Doc;\n\n/**\n * Given a Y.Text object and an updated string value, diff the new value and\n * apply the delta to the Y.Text.\n *\n * @param blockYText     The Y.Text to update.\n * @param updatedValue   The updated value.\n * @param cursorPosition The position of the cursor after the change occurs.\n */\nexport function mergeRichTextUpdate(\n\tblockYText: Y.Text,\n\tupdatedValue: string,\n\tcursorPosition: number | null = null\n): void {\n\t// Gutenberg does not use Yjs shared types natively, so we can only subscribe\n\t// to changes from store and apply them to Yjs types that we create and\n\t// manage. Crucially, for rich-text attributes, we do not receive granular\n\t// string updates; we get the new full string value on each change, even when\n\t// only a single character changed.\n\t//\n\t// The code below allows us to compute a delta between the current and new\n\t// value, then apply it to the Y.Text.\n\n\tif ( ! localDoc ) {\n\t\t// Y.Text must be attached to a Y.Doc to be able to do operations on it.\n\t\t// Create a temporary Y.Text attached to a local Y.Doc for delta computation.\n\t\tlocalDoc = new Y.Doc();\n\t}\n\n\tconst localYText = localDoc.getText( 'temporary-text' );\n\tlocalYText.delete( 0, localYText.length );\n\tlocalYText.insert( 0, updatedValue );\n\n\tconst currentValueAsDelta = new Delta( blockYText.toDelta() );\n\tconst updatedValueAsDelta = new Delta( localYText.toDelta() );\n\tconst deltaDiff = currentValueAsDelta.diffWithCursor(\n\t\tupdatedValueAsDelta,\n\t\tcursorPosition\n\t);\n\n\tblockYText.applyDelta( deltaDiff.ops );\n}\n"],
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